US20090308588A1 - Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones - Google Patents
Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones Download PDFInfo
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- US20090308588A1 US20090308588A1 US12/139,604 US13960408A US2009308588A1 US 20090308588 A1 US20090308588 A1 US 20090308588A1 US 13960408 A US13960408 A US 13960408A US 2009308588 A1 US2009308588 A1 US 2009308588A1
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- obturating
- tubing section
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/004—Indexing systems for guiding relative movement between telescoping parts of downhole tools
- E21B23/006—"J-slot" systems, i.e. lug and slot indexing mechanisms
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
Definitions
- Hydrocarbon-producing wells often are stimulated by hydraulic fracturing operations, wherein a fracturing fluid may be introduced into a portion of a subterranean formation penetrated by a well bore at a hydraulic pressure sufficient to create or enhance at least one fracture therein. Stimulating or treating the well in such ways increases hydrocarbon production from the well.
- the fracturing equipment may be included in a completion assembly used in the overall production process.
- the multiple fractures should have adequate conductivity, so that the greatest possible quantity of hydrocarbons in an oil and gas reservoir can be drained/produced into the well bore.
- actuatable sleeve assemblies are also referred to as stimulation sleeves, or casing or tubing windows.
- a stimulation sleeve may include a section of tubing having holes or apertures pre-formed in the tubing, and a sliding sleeve movable relative to the tubing section.
- the sliding sleeve also includes apertures alignable with the apertures in the tubing section.
- the sliding sleeve moves and the sliding sleeve apertures are aligned with the tubing section apertures. This exposes the reservoir to the interior of the tubing string, and vice versa.
- the flow path created between the reservoir and the tubing string through the stimulation sleeve can be used for fracturing or production operations.
- the apertures in the tubing section may include jet forming nozzles to provide a fluid jet into the formation, causing tunnels and fractures therein.
- actuatable sleeve assemblies may be used in series along a downhole tubular to communicate with multiple pay zones during fracturing or completion operations.
- To selectively actuate each successive sleeve assembly differently sized balls or other obturating members are released into the tubing string.
- Each sleeve assembly includes a ball seat having a different inner diameter. The sleeve assembly having the largest ball seat is disposed furthest uphole, or closest to the surface of the well, while each successive sleeve assembly below the initial assembly includes an incrementally decreasing ball seat diameter.
- smaller balls may be released into the tubing string to pass through the larger diameter ball seats and selectively actuate the lower sleeve assemblies. Subsequently, incrementally larger sized balls are released into the tubing string to actuate each successive sleeve assembly in ascending order up the well.
- Such a tubing assembly with successive diameter sleeves tends to restrict the inner diameter of the flow bore through the tubing string with the lower, smaller diameter sleeves, thereby also restricting the flow rates and treatment pressures that can be achieved with the tubing assembly.
- a successive diameter system limits the number of sleeve assemblies that can be disposed in the tubing string because the flow bore of the tubing string has a limited number of incremental diameters between the maximum diameter of the flow bore and the minimum diameter that can still achieve treatment pressure flow rates.
- maintaining an inner diameter of the flow bore for flow rates and treatment pressures, and increasing the number of pay zones is needed.
- the present disclosure includes embodiments for maintaining an increased or substantially uniform inner diameter of a treatment or completion assembly having stimulation sleeves, and for increasing the number of stimulation sleeves included in the treatment or completion assembly.
- a well bore servicing apparatus comprising an first sleeve slidably disposed in a tubing section, an second sleeve slidably disposed in the first sleeve, an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot, and an expandable seat disposed in the inner sleeve to receive a plurality of obturating members.
- a well bore servicing apparatus comprising a work string, a tubing section coupled to the work string, a plurality of sleeve assemblies disposed in the tubing section, and a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies, wherein the plurality of seats are substantially the same size.
- a method of servicing a well bore comprising disposing a tubing section in the well bore, positioning the tubing section adjacent a plurality of formation zones, passing a first obturating member through a first moveable sleeve, catching the first obturating member in a second moveable sleeve to actuate a sleeve assembly adjacent a first formation zone, and catching a second obturating member in the first moveable sleeve to actuate a second sleeve assembly adjacent a second formation zone, wherein the first and second obturating members are substantially the same size.
- a method of servicing a well bore comprising placing a tubing section in the well bore via a work string, and actuating a plurality of sleeve assemblies in the tubing section with same-size obturating members.
- a method of servicing a well bore comprising disposing a tubing section having a plurality of actuatable sleeve assemblies in the well bore, providing a series of obturating members having substantially the same size to actuate the sleeve assemblies, and successively actuating the sleeve assemblies with the same-size obturating member to successively treat a plurality of formation zones.
- FIG. 1 is a schematic, partial cross-section view of a fluid treatment and completion apparatus in an operating environment
- FIGS. 2A and 2B are cross-section views of a stimulation sleeve in a closed position
- FIGS. 3A and 3B are cross-section views of the stimulation sleeve of FIGS. 2A and 2B in an open position;
- FIG. 4A is a partial cross-section view of a hydrojetting casing window assembly
- FIG. 4B is a partial cross-section view of the casing window assembly of FIG. 4A in a shifted open position
- FIG. 5 is a partial cross-section view of a well completion assembly including embodiments of FIGS. 4A and 4B ;
- FIG. 6A is a partial cross-section view of an indexing assembly
- FIG. 6B is a profile view of an indexing slot of the indexing assembly of FIG. 6A ;
- FIG. 7 is a partial cross-section view of an alternative embodiment of an indexing assembly in an initial position
- FIG. 8 is a partial cross-section view of the indexing assembly of FIG. 7 receiving a dropped ball
- FIG. 9 is a partial cross-section view of the indexing assembly of FIG. 7 in a release position
- FIG. 10 is a partial cross-section view of the indexing assembly of FIG. 7 in a return position
- FIG. 11 is a profile view of an indexing slot of the indexing assembly of FIG. 7 .
- any use of any form of the terms “connect”, “engage”, “couple”, “attach”, or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described.
- the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to . . . ”. Reference to up or down will be made for purposes of description with “up”, “upper”, “upwardly” or “upstream” meaning toward the surface of the well and with “down”, “lower”, “downwardly” or “downstream” meaning toward the terminal end of the well, regardless of the well bore orientation.
- zone refers to separate parts of the wellbore designated for treatment or production and may refer to an entire hydrocarbon formation or separate portions of a single formation such as horizontally and/or vertically spaced portions of the same formation.
- seat as used herein may be referred to as a ball seat, but it is understood that seat may also refer to any type of catching or stopping device for an obturating member or other member sent through a work string fluid passage that comes to rest against a restriction in the passage.
- a well bore servicing apparatus including multiple sleeve assemblies disposed in a work string that are selectively actuatable to expose different formation zones to an inner fluid passage of the work string at different times.
- the sleeve assemblies may be sequentially actuated to expose the inner fluid passage to the formation zones such that they are treated at different times in a certain order.
- the sleeve assemblies may also include an inner indexing assembly allowing the sleeve assemblies to be actuated without loss of the inner diameter of the fluid passage in the work string, and without using multiple sizes of dropped balls.
- the indexing assembly may include an inner sleeve that is moveable and lockable relative to the moveable sleeve of the sleeve assemblies.
- the indexing assembly can be manipulated to allow a pre-determined number of obturating members to pass through a seat in the indexing assembly before a selected obturating members is caught in the seat and the indexing assembly is moved to actuate the sleeve assembly.
- the indexing assembly is configured to count the number of passing obturating members before actuation.
- the number of counted obturating members can be adjusted.
- the counting can be achieved with a J-slot or indexing slot communicating between the inner sleeve of the indexing assembly and the moveable or outer sleeve of the sleeve assembly, and an expandable seat for the obturating member.
- a drilling rig 110 is positioned on the earth's surface 105 and extends over and around a well bore 120 that penetrates a subterranean formation F for the purpose of recovering hydrocarbons.
- the well bore 120 may be drilled into the subterranean formation F using conventional (or future) drilling techniques.
- the well bore 120 may extend substantially vertically away from the surface 105 over a vertical portion 122 , or may deviate at any angle from the surface 105 over a deviated or horizontal portion 124 . In some instances, all or portions of the well bore 120 may be vertical, deviated, horizontal, and/or curved.
- At least a portion of the vertical well bore 122 may be lined with casing 125 that may be cemented 127 into position against the formation F in a conventional manner.
- the horizontal portion 124 may be cased and cemented also, or the operating environment for the apparatus 100 includes an uncased well bore 120 .
- the drilling rig 110 includes a derrick 112 with a rig floor 114 through which a tubing or work string 118 extends downwardly from the drilling rig 110 into the well bore 120 .
- the tubing string 118 suspends a representative downhole apparatus 100 to a predetermined depth within the well bore 120 to perform a specific operation, such as perforating a casing, expanding a fluid path therethrough, fracturing the formation F, producing the formation F, or other completion operation.
- the tubing string 18 may also be known as the entire conveyance above and coupled to the apparatus 100 .
- the drilling rig 110 is conventional and therefore includes a motor driven winch and other associated equipment for extending the tubing string 118 into the well bore 120 to position the apparatus 100 at the desired depth.
- FIG. 1 refers to a stationary drilling rig 110 for lowering and setting the apparatus 100 within a land-based well bore 120
- mobile workover rigs, well servicing units, such as coiled tubing units, and the like could also be used to lower the apparatus 100 into the well bore 120
- the apparatus 100 may also be used in other operational environments, such as within an offshore well bore.
- the apparatus 100 comprises an upper end having a liner hanger 132 such as, for example, a Halliburton VersaFlex® liner hanger, a lower end 136 , and a tubing section 134 extending therebetween.
- the lower end 136 may have a float shoe 138 and a float collar 140 of a type known in the art connected therein, and other tubing conveyed devices 142 , 144 connected therein.
- the horizontal well bore 124 and the tubing section 134 define an annulus 146 therebetween.
- the tubing section 134 includes an interior 148 that defines a flow passage 150 therethrough.
- an inner string 152 is disposed in tubing section 134 and extends therethrough so that a lower end 154 thereof extends into and is received in a polished bore receptacle 144 .
- the inner string 152 may be used to carry cement if the completion operation requires cement. Alternatively, cement may not be needed and the tubing section 134 may be without the inner string 152 such that the flow passage 150 is the main flowbore through the apparatus 100 .
- a plurality of actuatable sleeve assemblies or stimulation sleeves 158 are connected in the tubing section 134 .
- the stimulation sleeves 158 may be, for example, ball drop activated, Delta Stim® Sleeves available from Halliburton Energy Services, Inc.
- the stimulation sleeve 158 comprises an outer housing 160 with an opening sleeve 162 detachably connected therein.
- the opening sleeve 162 has a lower end 163 .
- the opening sleeve 162 is slidable or movable in the housing 160 as explained in more detail hereinbelow.
- the outer housing 160 has an upper end 164 and a lower end 166 , both of which are adapted to be directly connected or threaded into a tubing section such that the outer housing 160 makes up a part of the tubing section 134 .
- the opening sleeve 162 is initially connected to the outer housing 160 with a snap ring 168 which extends into a groove 170 defined on an inner surface 172 of the outer housing 160 .
- shear pins extending through the outer housing 160 and into the sleeve 162 may be utilized to detachably connect the sleeve 162 to the outer housing 160 .
- Guide pins 176 may be threaded or otherwise attached to the sleeve 162 and may be received in axial grooves or axial slots 178 in the housing 160 .
- the guide pins 176 are slidable in the axial slots 178 , which will prevent relative rotation between the sleeve 162 and the outer housing 160 .
- the sleeve 162 has a plurality of sleeve or door ports 180 therethrough.
- the outer housing 160 has a plurality of housing ports 182 defined therein. In the position shown in FIGS. 2A and 2B , the sleeve ports 180 are misaligned from the housing ports 182 such that the stimulation sleeve 158 is in a closed position.
- the sleeve 162 has a seat ring 184 operably associated therewith and is connected therein at or near the lower end 163 .
- the seat ring 184 has a central opening 186 defining a diameter 188 therethrough, and has a seat surface 190 for engaging an obturating member to be dropped through the tubing string.
- an obturating member 194 such as a closing ball shown in FIG. 3B , is dropped through the tubing string 118 so that it will engage the seat 190 on the seat ring 184 .
- the obturating member 194 may be other closing devices such as plugs and darts that will engage the seat 190 and prevent flow therethrough.
- Pressure is increased to overcome the holding force applied by the snap ring 168 and the shear pins, thereby moving the opening sleeve 162 to the position shown in FIGS. 3A and 3B in which the sleeve ports 180 and the casing ports 182 are aligned to allow for the passage of fluids therethrough.
- casing window assembly 300 is shown and can be adapted for use as an alternative embodiment of the stimulation sleeve 158 .
- casing window refers to a section of casing configured to enable selective access to one or more specified zones of an adjacent subterranean formation.
- a casing window has a window that may be selectively opened and closed by an operator, for example, movable sleeve member 304 .
- the casing window assembly 300 can have numerous configurations and can employ a variety of mechanisms to selectively access one or more specified zones of an adjacent subterranean formation.
- the casing window 300 includes a substantially cylindrical outer casing 302 that receives a movable sleeve member 304 .
- the outer casing 302 includes one or more apertures 306 to allow the communication of a fluid from the interior of the outer casing 302 into an adjacent subterranean formation.
- the apertures 306 are configured such that fluid jet forming nozzles 308 may be coupled thereto.
- the fluid jet forming nozzles 308 may be threadably inserted into the apertures 306 .
- the fluid jet forming nozzles 308 may be isolated from the annulus 310 (formed between the outer casing 302 and the movable sleeve member 304 ) by coupling seals or pressure barriers 312 to the outer casing 302 .
- the movable sleeve member 304 includes one or more apertures 314 configured such that, as shown in FIG. 4A , the apertures 314 may be selectively misaligned with the apertures 306 so as to prevent the communication of a fluid from the interior of the movable sleeve member 304 into an adjacent subterranean formation.
- the movable sleeve member 304 may be shifted axially, rotatably, or by a combination thereof such that, as shown in FIG. 4B , the apertures 314 selectively align with the apertures 306 so as to allow the communication of a fluid from the interior of the movable sleeve member 304 into an adjacent subterranean formation.
- the movable sleeve member 304 may be shifted via the use of a ball drop mechanism.
- an exemplary well completion assembly 400 includes open casing window 402 and closed casing window 404 formed in a tubing section or conduit 406 .
- the well completion assembly 400 may be selectively configured such that the casing window 404 is open and the casing window 402 is closed, such that the casing windows 402 and 404 are both open, or such the that casing windows 402 and 404 are both closed.
- a fluid 408 may be pumped down the conduit 406 and communicated through the fluid jet forming nozzles 410 of the open casing window 402 against the surface of the well bore 120 in the zone 414 of the subterranean formation F.
- the fluid 408 would not be communicated through the fluid jet forming nozzles 418 of the closed casing window 404 , thereby isolating the zone 420 of the subterranean formation F from any well completion operations being conducted through the open casing window 402 involving the zone 414 .
- the fluid 408 may include any of the embodiments disclosed elsewhere herein.
- the fluid 408 is pumped through the fluid jet forming nozzles 410 at a velocity sufficient for fluid jets 422 to form perforation tunnels 424 . In one embodiment, after the perforation tunnels 424 are formed, the fluid 408 is pumped into the conduit 406 and through the fluid jet forming nozzles 410 at a pressure sufficient to form cracks or fractures 426 along the perforation tunnels 424 .
- a plurality of the sleeve assemblies 158 are included in the tubing section 134 of the treatment and completion apparatus 100 .
- the sleeve assemblies 158 are positioned adjacent the selected zones to be treated, such as the plurality of selected zones 80 , 82 , 84 , 86 , 88 and 90 that may be treated and produced with the methods and apparatus described herein.
- a first ball or other obturating member may be dropped into the work string 118 .
- a treatment fluid such as an acidizing fluid or a fracturing fluid
- a high pressure fluid is communicated through the sleeve assembly fluid path to provide a hydrojet stream to the zone 90 .
- high pressure for example, is generally greater than about 1,000 p.s.i., alternatively greater than about 3,500 p.s.i., alternatively greater than about 10,000 p.s.i., and alternatively greater than about 15,000 p.s.i.
- This procedure may be followed to selectively and successively actuate the sleeve assemblies 158 in ascending order, and service any and/or all of the zones 80 , 82 , 84 , 86 , 88 , 90 .
- the center opening 186 ( FIGS. 2B and 3B ) in each of the sleeve assemblies 158 is of a diameter 188 such that the balls 194 may pass therethrough to engage the seat sleeves 184 in sleeve assemblies therebelow. Therefore, the seat sleeve diameter 188 will be gradually and incrementally larger from the lowermost seat sleeve through the final seat sleeve in the uppermost sleeve assembly.
- a sliding sleeve sub or indexing assembly 500 includes an outer sleeve 502 and an inner sleeve member 504 disposed therein.
- the outer sleeve 502 is analogous to the opening sleeve 162 of FIGS. 2A-3B .
- the inner sleeve member 504 includes an upper end 506 , a lower end 508 and a flow bore 505 therethrough.
- the upper end 506 includes an increased diameter portion 510 having an indexing slot or J-slot pattern 512 that receives a control lug 514 disposed on an inner surface of the outer sleeve 502 .
- the interaction between the lug 514 and the indexing slot 512 is the primary mode of communication between the outer sleeve 502 and the inner sleeve member 504 .
- the lower end 508 includes a projection 522 and a series of collet fingers 524 .
- a biasing spring 516 Disposed between an outer sleeve shoulder 520 and an inner sleeve shoulder 518 is a biasing spring 516 .
- the inner surface of the outer sleeve 502 also includes a recessed portion 526 .
- the indexing slot 512 is shown in an unwrapped or flattened profile view.
- the indexing slot 512 may also be referred to as a continuous J-slot or a control groove.
- the indexing slot 512 includes a plurality of biased, reset or stop positions 530 , 532 , 534 and a plurality of release positions 536 , 538 for the lug 514 .
- the slot 512 also includes a final engagement or actuation position 540 .
- the indexing slot 512 is disposed about the upper portion of the tube forming the inner sleeve 504 .
- the indexing slot 512 in some embodiments, may be a solid member, such as a metal sheet, having a slot or groove formed therein.
- the indexing slot may be shaped to extend around a cylindrical member, as is shown in FIG. 6A .
- the lug 514 includes a circular shape from a top view of the lug.
- the lug may include other shapes, such as an oval or elliptical shape.
- other control slot operating members may interact with the indexing slot 512 to provide the relationships described herein.
- the indexing assembly 500 is assembled as shown in FIG. 6A , with the inner sleeve 504 biased upward by the spring 516 such that the collet fingers 524 and the projection 526 are above the recess 526 .
- the control lug 514 is initially disposed in one of the stop positions 530 , 532 , 534 and limits the upward movement of the inner sleeve 504 .
- the initial position of the lug 514 is the furthest from the final position 540 to allow the most number of cycles through the indexing slot, though the initial position can be selected to pre-determine the number of cycles through the indexing slot and thus the number of balls that pass through the inner sleeve 504 .
- a first ball such as that shown in FIG.
- the ball is then allowed to pass into the flow bore 544 below the inner sleeve 504 .
- the pressure on the inner sleeve 504 is relieved the biasing spring moves the inner sleeve 504 upward.
- the inner sleeve 504 and the indexing slot 512 are guided about the lug 514 such that the lug is now placed in the stop position 532 .
- the lug 514 is guided through any number of sets of stop and release positions until the lug 514 reaches the final position 540 .
- the final position 540 vertical movement of the inner sleeve 504 is restricted such that the pressure buildup in the inner sleeve 504 is transferred to the outer sleeve 502 and the overall sleeve assembly is actuated as described herein.
- the ball seat 542 acts analogously to the ball seat 190 in the seat ring 184 of FIGS. 2B and 3B .
- the outer sleeve 502 then moves similarly to the sleeve 162 of the sleeve assembly 158 .
- the indexing assembly 500 can replace the seat ring 184 arrangement of the sleeve assembly 158 while providing increased flexibility for inner sleeve 504 movement and ball pass-through while the overall sleeve assembly remains unactuated.
- the indexing assembly 500 can be pre-set to count any number of ball pass-throughs. For example, if an indexing assembly 500 is placed in the second lowermost position, wherein another assembly is below it, and it is known that one ball must pass through the indexing assembly 500 , then the assembly is adjusted accordingly.
- the indexing slot 512 is simply manufactured to have the initial position 532 , the release position 538 , the reset position 534 and the final position 540 . Therefore, one cycle from position 532 to position 538 to position 534 allows one ball to pass through the indexing assembly 500 before the final position 540 is reached and the sleeve assembly is actuated.
- the indexing slot 512 is manufactured to have any number of stop and release positions, and the indexing assembly 500 is assembled such that the initial position of the lug 514 is in the second to last stop position, or position 532 .
- a plurality of indexing assemblies 500 may be disposed in a tubing section in series, such as in the series of stimulation sleeves 158 shown in FIG. 1 .
- the series of indexing assemblies 500 will include ball seats 542 all having the same unexpanded diameter to receive the same size balls.
- the diameter of unexpanded ball seat 542 in FIG. 6A may be 2.75 inches, while the balls may be 3 inches in diameter.
- Each assembly 500 can be pre-set to catch and release a different number of 3-inch balls such that the series of assemblies will actuate a series of sleeve assemblies 158 or 300 to successively expose the work and tubing strings to different zones of interest 80 , 82 , 84 , 86 , 88 , 90 while passing the same size ball through the plurality of indexing and sleeve assemblies.
- a first series of indexing and sleeve assemblies is adapted to receive a first size ball while a second series of indexing and sleeve assemblies is adapted to receive a second size ball, thereby further expanding the total number of sleeve assemblies that can be actuated in the well.
- a third series may be added and so on.
- a bottom series of four indexing and sleeve assemblies may be adapted to successively actuate upon receiving a series of four 2-inch balls.
- a next series of four indexing and sleeve assemblies may be adapted to successively actuate upon receiving a series of four 2.25-inch balls.
- a third series disposed uphole of the second series may be adapted to successively actuate upon receiving a series of four 2.5-inch balls.
- a total of twelve indexing and sleeve assemblies can be actuated to expose zones of interest. Further added series will add indexing and sleeve assemblies in increments of four, or however many balls the indexing assembly is designed to catch and release as designed herein.
- the collet fingers 524 are dipped in stiffening or hardening agents for added strength or resistance.
- the collet fingers 524 are at rest in the contracted position shown in FIG. 6A , and the force of the ball passing through the collet fingers causes them to expand into the recess 526 .
- These collet fingers 524 may also be referred to as “normally closed” or “normally contracted.”
- the collet fingers are formed and strengthened to normally be in the expanded position shown in FIG. 9 , such that the collet fingers are forced together as shown in FIG. 6A and allowed to spread automatically when placed in the position of FIG. 9 .
- collet fingers 524 may also be referred to as “normally open” or “normally expanded.” In other embodiments, the collet fingers 524 are dipped in an elastomer or other compressible material such that when the collet fingers are contracted as shown in FIG. 6A , the elastomer coating on one finger will compress against the elastomer coating on an adjacent finger to close the spaces between the fingers and provide a sealed ball seat 542 .
- control lug 514 is disposed on the outer surface of the inner sleeve 504 and the indexing slot 512 is disposed on the inner surface of the outer sleeve 502 , i.e., they are switched.
- the profile view of FIG. 6B would be flipped such that the stop positions would be on top and the release positions on bottom, and the final position would be on top.
- a further embodiment includes an indexing assembly 600 having similar components as the assembly 500 , such as an outer sleeve 602 and an inner sleeve 604 .
- assembly 600 further includes an upper recessed portion 627 .
- a ball 670 enters the flow bore 605 and arrives at the seat 642 as shown in FIG. 8 .
- the pressure buildup above the ball 670 overcomes the biasing force provided by the spring 616 and moves the inner sleeve 604 downward. As shown in FIG.
- the collet fingers 624 expand into the recess 626 , either by the force provided by the ball 670 or by the normally open disposition of the fingers, and the ball 670 passes through the fingers 624 and the seat 642 to travel downward 650 through the flow bore 644 .
- the biasing force of the spring 616 then returns the inner sleeve 604 to the middle position shown in FIG. 8 , readying the indexing assembly 600 to receive another ball 670 .
- the lug 614 and indexing slot 612 operate as previously described.
- a ball may be forced upward along a return path 660 in the flow bore 644 by fluid pressure or other means, and the indexing assembly 600 is adapted to work in reverse wherein the upper recess 627 receives the expanding collet fingers 624 as shown in FIG. 10 .
- a reserve position 648 is provided in the indexing slot 612 to accommodate the upward movement of the inner sleeve 604 as shown in FIG. 10 .
- the indexing assembly 600 may be assembled such that the lug 614 is given an initial position 630 .
- Ball engagement on the seat 642 causes the inner sleeve 604 to move downward, and thus the lug 614 moves upward in the indexing slot 612 to the first release position 636 .
- the ball 670 passes through the collet fingers 624 , thereby relieving the pressure in the inner sleeve 604 .
- the biasing spring 616 returns the inner sleeve 604 and the indexing slot 612 to a position placing the lug 614 in a first reset position 632 .
- Another ball 670 may be cycled through the inner sleeve 604 , placing the lug 614 in a second release position 638 , then in a second reset position 634 which is also the catch position.
- Position 634 is a catch position because the lug 614 is not allowed to move upward to a position similar to positions 636 , 638 , thereby preventing downward movement of the inner sleeve 604 and release of the ball 670 .
- the pressure buildup above the ball 670 is transferred to the outer sleeve 602 , which is the slidable sleeve of a larger sleeve assembly as described herein.
- the slot 612 provides an additional position 648 that allows upward movement of the inner sleeve 604 to accommodate the return of the ball 670 shown in FIG. 10 .
- the well can be produced unobstructed and without intervention to drill out the ball-engaged indexing and sleeve assemblies.
- the balls or other obturating members are breakable or dissolvable to remove them from the inner flow bores.
- the total number of reset and release positions is adjusted to increase or decrease the number of balls the indexing assemblies are designed to catch and release.
- the indexing slots 512 , 612 are designed to release two balls before catching the third ball.
- additional sets of reset and release positions can be added to increase the number of balls that are released before the final ball is caught.
- zones, indexing assemblies and sleeve assemblies shown herein is not intended to be limiting and is shown only for exemplary purposes. Any desired number of zones may be treated or produced.
- the plurality of zones will be treated sequentially upwardly. For example, when a sleeve assembly is moved to align openings, dissolving fluid and then treatment fluid may be flowed into the zone to be treated, and the next zone desired to be treated is done so in the manner described. Once the selected zones have been treated, the balls can be flowed back to the surface, as previously described, or drilled out and the well can be produced through each of the selected zones in a manner known in the art.
- the mechanical assemblies 500 , 600 may be similar with the exception of the indexing slots 512 , 612 .
- the indexing slots 512 , 612 act as counter mechanisms to count the number of balls that pass through the assemblies. While the other elements and components of the assemblies remain similar, the indexing slots 512 , 612 can be replaced by alternative counting mechanisms.
- the electro-mechanical sliding sleeve assemblies or subs may incorporate electronics, and the counter or reader in the sleeve assembly could be actuated by magnets, RFID tags or other “smarts” in the balls.
- the sliding sleeve sub can be placed in the open or release position as the normal position.
- An electronic reader in the inner sleeve electronically counts the magnets or tags in the balls as they pass through the expandable seat, and upon counting a pre-determined number of balls, the sleeve is actuated to move to the closed position.
- the inner sleeve can be moved to the closed position by a motor or other drive means known in the art.
- the counting of the balls is accomplished by electronic or electrical means rather than mechanical means, and the inner sleeve is driven not by fluid pressure but by a drive means such as an electro-mechanical actuator.
- the electro-mechanical actuator can be replaced by pressurized chambers adjacent the inner sliding sleeve.
- An unpressurized chamber is adjacent and communicates with the inner sleeve, and is separate from a pressurized chamber by a burst disc.
- the disc can be burst to expose the unpressurized chamber and thus the inner sliding sleeve to fluid pressure to move the sleeve to its closed position as described herein.
- the embodiments of the indexing or sliding sleeve assemblies can be used in other systems.
- a system including a series open-hole packer can incorporate the indexing or sliding sleeve assemblies for successive actuation of the packers.
Abstract
A well bore servicing apparatus comprising an first sleeve slidably disposed in a tubing section, an second sleeve slidably disposed in the first sleeve, an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot, and an expandable seat disposed in the inner sleeve to receive a plurality of obturating members. A well bore servicing apparatus comprising a work string, a tubing section coupled to the work string, a plurality of sleeve assemblies disposed in the tubing section, and a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies, wherein the plurality of seats are substantially the same size.
Description
- Hydrocarbon-producing wells often are stimulated by hydraulic fracturing operations, wherein a fracturing fluid may be introduced into a portion of a subterranean formation penetrated by a well bore at a hydraulic pressure sufficient to create or enhance at least one fracture therein. Stimulating or treating the well in such ways increases hydrocarbon production from the well. The fracturing equipment may be included in a completion assembly used in the overall production process.
- In some wells, it may be desirable to individually and selectively create multiple fractures along a well bore at a distance apart from each other, creating multiple “pay zones.” The multiple fractures should have adequate conductivity, so that the greatest possible quantity of hydrocarbons in an oil and gas reservoir can be drained/produced into the well bore. When stimulating a formation from a well bore, or completing the well bore, especially those well bores that are highly deviated or horizontal, it may be advantageous to create multiple pay zones with a series of actuatable sleeve assemblies disposed in a downhole tubular. The actuatable sleeve assemblies are also referred to as stimulation sleeves, or casing or tubing windows.
- A stimulation sleeve may include a section of tubing having holes or apertures pre-formed in the tubing, and a sliding sleeve movable relative to the tubing section. The sliding sleeve also includes apertures alignable with the apertures in the tubing section. Upon actuation of the stimulation sleeve, such as by ball drop or other obturating member interference, the sliding sleeve moves and the sliding sleeve apertures are aligned with the tubing section apertures. This exposes the reservoir to the interior of the tubing string, and vice versa. The flow path created between the reservoir and the tubing string through the stimulation sleeve can be used for fracturing or production operations. The apertures in the tubing section may include jet forming nozzles to provide a fluid jet into the formation, causing tunnels and fractures therein.
- While the stimulation sleeve just described is one embodiment, other embodiments of actuatable sleeve assemblies may be used in series along a downhole tubular to communicate with multiple pay zones during fracturing or completion operations. To selectively actuate each successive sleeve assembly, differently sized balls or other obturating members are released into the tubing string. Each sleeve assembly includes a ball seat having a different inner diameter. The sleeve assembly having the largest ball seat is disposed furthest uphole, or closest to the surface of the well, while each successive sleeve assembly below the initial assembly includes an incrementally decreasing ball seat diameter. Thus, smaller balls may be released into the tubing string to pass through the larger diameter ball seats and selectively actuate the lower sleeve assemblies. Subsequently, incrementally larger sized balls are released into the tubing string to actuate each successive sleeve assembly in ascending order up the well.
- Such a tubing assembly with successive diameter sleeves tends to restrict the inner diameter of the flow bore through the tubing string with the lower, smaller diameter sleeves, thereby also restricting the flow rates and treatment pressures that can be achieved with the tubing assembly. Further, a successive diameter system limits the number of sleeve assemblies that can be disposed in the tubing string because the flow bore of the tubing string has a limited number of incremental diameters between the maximum diameter of the flow bore and the minimum diameter that can still achieve treatment pressure flow rates. To achieve desirable results in the aforementioned treatment and production processes, maintaining an inner diameter of the flow bore for flow rates and treatment pressures, and increasing the number of pay zones is needed. The present disclosure includes embodiments for maintaining an increased or substantially uniform inner diameter of a treatment or completion assembly having stimulation sleeves, and for increasing the number of stimulation sleeves included in the treatment or completion assembly.
- Disclosed herein is a well bore servicing apparatus comprising an first sleeve slidably disposed in a tubing section, an second sleeve slidably disposed in the first sleeve, an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot, and an expandable seat disposed in the inner sleeve to receive a plurality of obturating members.
- Also disclosed herein is a well bore servicing apparatus comprising a work string, a tubing section coupled to the work string, a plurality of sleeve assemblies disposed in the tubing section, and a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies, wherein the plurality of seats are substantially the same size.
- Further disclosed herein is a method of servicing a well bore comprising disposing a tubing section in the well bore, positioning the tubing section adjacent a plurality of formation zones, passing a first obturating member through a first moveable sleeve, catching the first obturating member in a second moveable sleeve to actuate a sleeve assembly adjacent a first formation zone, and catching a second obturating member in the first moveable sleeve to actuate a second sleeve assembly adjacent a second formation zone, wherein the first and second obturating members are substantially the same size.
- Further disclosed herein is a method of servicing a well bore comprising placing a tubing section in the well bore via a work string, and actuating a plurality of sleeve assemblies in the tubing section with same-size obturating members.
- Further disclosed herein is a method of servicing a well bore comprising disposing a tubing section having a plurality of actuatable sleeve assemblies in the well bore, providing a series of obturating members having substantially the same size to actuate the sleeve assemblies, and successively actuating the sleeve assemblies with the same-size obturating member to successively treat a plurality of formation zones.
- For a more detailed description of the embodiments, reference will now be made to the following accompanying drawings:
-
FIG. 1 is a schematic, partial cross-section view of a fluid treatment and completion apparatus in an operating environment; -
FIGS. 2A and 2B are cross-section views of a stimulation sleeve in a closed position; -
FIGS. 3A and 3B are cross-section views of the stimulation sleeve ofFIGS. 2A and 2B in an open position; -
FIG. 4A is a partial cross-section view of a hydrojetting casing window assembly; -
FIG. 4B is a partial cross-section view of the casing window assembly ofFIG. 4A in a shifted open position; -
FIG. 5 is a partial cross-section view of a well completion assembly including embodiments ofFIGS. 4A and 4B ; -
FIG. 6A is a partial cross-section view of an indexing assembly; -
FIG. 6B is a profile view of an indexing slot of the indexing assembly ofFIG. 6A ; -
FIG. 7 is a partial cross-section view of an alternative embodiment of an indexing assembly in an initial position; -
FIG. 8 is a partial cross-section view of the indexing assembly ofFIG. 7 receiving a dropped ball; -
FIG. 9 is a partial cross-section view of the indexing assembly ofFIG. 7 in a release position; -
FIG. 10 is a partial cross-section view of the indexing assembly ofFIG. 7 in a return position; and -
FIG. 11 is a profile view of an indexing slot of the indexing assembly ofFIG. 7 . - In the drawings and description that follow, like parts are typically marked throughout the specification and drawings with the same reference numerals, respectively. The drawing figures are not necessarily to scale. Certain features of the invention may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in the interest of clarity and conciseness. The present invention is susceptible to embodiments of different forms. Specific embodiments are described in detail and are shown in the drawings, with the understanding that the present disclosure is to be considered an exemplification of the principles of the invention, and is not intended to limit the invention to that illustrated and described herein. It is to be fully recognized that the different teachings of the embodiments discussed below may be employed separately or in any suitable combination to produce desired results.
- Unless otherwise specified, any use of any form of the terms “connect”, “engage”, “couple”, “attach”, or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described. In the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to . . . ”. Reference to up or down will be made for purposes of description with “up”, “upper”, “upwardly” or “upstream” meaning toward the surface of the well and with “down”, “lower”, “downwardly” or “downstream” meaning toward the terminal end of the well, regardless of the well bore orientation. The term “zone” or “pay zone” as used herein refers to separate parts of the wellbore designated for treatment or production and may refer to an entire hydrocarbon formation or separate portions of a single formation such as horizontally and/or vertically spaced portions of the same formation. The term “seat” as used herein may be referred to as a ball seat, but it is understood that seat may also refer to any type of catching or stopping device for an obturating member or other member sent through a work string fluid passage that comes to rest against a restriction in the passage. The various characteristics mentioned above, as well as other features and characteristics described in more detail below, will be readily apparent to those skilled in the art upon reading the following detailed description of the embodiments, and by referring to the accompanying drawings.
- Disclosed herein are several embodiments of a well bore servicing apparatus including multiple sleeve assemblies disposed in a work string that are selectively actuatable to expose different formation zones to an inner fluid passage of the work string at different times. The sleeve assemblies may be sequentially actuated to expose the inner fluid passage to the formation zones such that they are treated at different times in a certain order. The sleeve assemblies may also include an inner indexing assembly allowing the sleeve assemblies to be actuated without loss of the inner diameter of the fluid passage in the work string, and without using multiple sizes of dropped balls. The indexing assembly may include an inner sleeve that is moveable and lockable relative to the moveable sleeve of the sleeve assemblies. The indexing assembly can be manipulated to allow a pre-determined number of obturating members to pass through a seat in the indexing assembly before a selected obturating members is caught in the seat and the indexing assembly is moved to actuate the sleeve assembly. In essence, the indexing assembly is configured to count the number of passing obturating members before actuation. The number of counted obturating members can be adjusted. The counting can be achieved with a J-slot or indexing slot communicating between the inner sleeve of the indexing assembly and the moveable or outer sleeve of the sleeve assembly, and an expandable seat for the obturating member.
- Referring to
FIG. 1 , a schematic representation of an exemplary operating environment for a fluid treatment orcompletion apparatus 100 is shown. Theapparatus 100 is an exemplary embodiment, and various other embodiments of theapparatus 100 consistent with the teachings herein are included. As depicted, adrilling rig 110 is positioned on the earth'ssurface 105 and extends over and around awell bore 120 that penetrates a subterranean formation F for the purpose of recovering hydrocarbons. The well bore 120 may be drilled into the subterranean formation F using conventional (or future) drilling techniques. The well bore 120 may extend substantially vertically away from thesurface 105 over avertical portion 122, or may deviate at any angle from thesurface 105 over a deviated orhorizontal portion 124. In some instances, all or portions of the well bore 120 may be vertical, deviated, horizontal, and/or curved. - At least a portion of the
vertical well bore 122 may be lined withcasing 125 that may be cemented 127 into position against the formation F in a conventional manner. Alternatively, thehorizontal portion 124 may be cased and cemented also, or the operating environment for theapparatus 100 includes anuncased well bore 120. Thedrilling rig 110 includes aderrick 112 with arig floor 114 through which a tubing orwork string 118 extends downwardly from thedrilling rig 110 into thewell bore 120. Thetubing string 118 suspends a representativedownhole apparatus 100 to a predetermined depth within the well bore 120 to perform a specific operation, such as perforating a casing, expanding a fluid path therethrough, fracturing the formation F, producing the formation F, or other completion operation. The tubing string 18 may also be known as the entire conveyance above and coupled to theapparatus 100. Thedrilling rig 110 is conventional and therefore includes a motor driven winch and other associated equipment for extending thetubing string 118 into the well bore 120 to position theapparatus 100 at the desired depth. - While the exemplary operating environment depicted in
FIG. 1 refers to astationary drilling rig 110 for lowering and setting theapparatus 100 within a land-based well bore 120, one of ordinary skill in the art will readily appreciate that mobile workover rigs, well servicing units, such as coiled tubing units, and the like, could also be used to lower theapparatus 100 into thewell bore 120. It should be understood that theapparatus 100 may also be used in other operational environments, such as within an offshore well bore. - In one embodiment, the
apparatus 100 comprises an upper end having aliner hanger 132 such as, for example, a Halliburton VersaFlex® liner hanger, alower end 136, and atubing section 134 extending therebetween. Thelower end 136 may have afloat shoe 138 and afloat collar 140 of a type known in the art connected therein, and other tubing conveyeddevices horizontal well bore 124 and thetubing section 134 define anannulus 146 therebetween. Thetubing section 134 includes an interior 148 that defines aflow passage 150 therethrough. In the embodiment shown, aninner string 152 is disposed intubing section 134 and extends therethrough so that alower end 154 thereof extends into and is received in apolished bore receptacle 144. Theinner string 152 may be used to carry cement if the completion operation requires cement. Alternatively, cement may not be needed and thetubing section 134 may be without theinner string 152 such that theflow passage 150 is the main flowbore through theapparatus 100. A plurality of actuatable sleeve assemblies orstimulation sleeves 158 are connected in thetubing section 134. Thestimulation sleeves 158 may be, for example, ball drop activated, Delta Stim® Sleeves available from Halliburton Energy Services, Inc. - Referring now to
FIGS. 2A and 2B , thestimulation sleeve 158 comprises anouter housing 160 with anopening sleeve 162 detachably connected therein. Theopening sleeve 162 has alower end 163. After becoming detached from thehousing 160, theopening sleeve 162 is slidable or movable in thehousing 160 as explained in more detail hereinbelow. Theouter housing 160 has anupper end 164 and alower end 166, both of which are adapted to be directly connected or threaded into a tubing section such that theouter housing 160 makes up a part of thetubing section 134. Theopening sleeve 162 is initially connected to theouter housing 160 with asnap ring 168 which extends into agroove 170 defined on aninner surface 172 of theouter housing 160. In addition, shear pins extending through theouter housing 160 and into thesleeve 162 may be utilized to detachably connect thesleeve 162 to theouter housing 160. Guide pins 176 may be threaded or otherwise attached to thesleeve 162 and may be received in axial grooves oraxial slots 178 in thehousing 160. The guide pins 176 are slidable in theaxial slots 178, which will prevent relative rotation between thesleeve 162 and theouter housing 160. Thesleeve 162 has a plurality of sleeve ordoor ports 180 therethrough. Theouter housing 160 has a plurality ofhousing ports 182 defined therein. In the position shown inFIGS. 2A and 2B , thesleeve ports 180 are misaligned from thehousing ports 182 such that thestimulation sleeve 158 is in a closed position. Thesleeve 162 has aseat ring 184 operably associated therewith and is connected therein at or near thelower end 163. Theseat ring 184 has a central opening 186 defining a diameter 188 therethrough, and has aseat surface 190 for engaging an obturating member to be dropped through the tubing string. - To move the
opening sleeve 162 from the closed position to an open position, an obturatingmember 194, such as a closing ball shown inFIG. 3B , is dropped through thetubing string 118 so that it will engage theseat 190 on theseat ring 184. Although shown as a closing ball, the obturatingmember 194 may be other closing devices such as plugs and darts that will engage theseat 190 and prevent flow therethrough. Pressure is increased to overcome the holding force applied by thesnap ring 168 and the shear pins, thereby moving theopening sleeve 162 to the position shown inFIGS. 3A and 3B in which thesleeve ports 180 and thecasing ports 182 are aligned to allow for the passage of fluids therethrough. - Referring now to
FIGS. 4A and 4B , an exemplarycasing window assembly 300 is shown and can be adapted for use as an alternative embodiment of thestimulation sleeve 158. As used herein, the term “casing window” refers to a section of casing configured to enable selective access to one or more specified zones of an adjacent subterranean formation. A casing window has a window that may be selectively opened and closed by an operator, for example,movable sleeve member 304. Thecasing window assembly 300 can have numerous configurations and can employ a variety of mechanisms to selectively access one or more specified zones of an adjacent subterranean formation. - The
casing window 300 includes a substantially cylindricalouter casing 302 that receives amovable sleeve member 304. Theouter casing 302 includes one ormore apertures 306 to allow the communication of a fluid from the interior of theouter casing 302 into an adjacent subterranean formation. Theapertures 306 are configured such that fluidjet forming nozzles 308 may be coupled thereto. In some embodiments, the fluidjet forming nozzles 308 may be threadably inserted into theapertures 306. The fluidjet forming nozzles 308 may be isolated from the annulus 310 (formed between theouter casing 302 and the movable sleeve member 304) by coupling seals orpressure barriers 312 to theouter casing 302. - The
movable sleeve member 304 includes one ormore apertures 314 configured such that, as shown inFIG. 4A , theapertures 314 may be selectively misaligned with theapertures 306 so as to prevent the communication of a fluid from the interior of themovable sleeve member 304 into an adjacent subterranean formation. Themovable sleeve member 304 may be shifted axially, rotatably, or by a combination thereof such that, as shown inFIG. 4B , theapertures 314 selectively align with theapertures 306 so as to allow the communication of a fluid from the interior of themovable sleeve member 304 into an adjacent subterranean formation. Themovable sleeve member 304 may be shifted via the use of a ball drop mechanism. - Referring now to
FIG. 5 , an exemplarywell completion assembly 400 includesopen casing window 402 andclosed casing window 404 formed in a tubing section orconduit 406. Alternatively, thewell completion assembly 400 may be selectively configured such that thecasing window 404 is open and thecasing window 402 is closed, such that thecasing windows casing windows - A fluid 408 may be pumped down the
conduit 406 and communicated through the fluidjet forming nozzles 410 of theopen casing window 402 against the surface of the well bore 120 in thezone 414 of the subterranean formation F. The fluid 408 would not be communicated through the fluidjet forming nozzles 418 of theclosed casing window 404, thereby isolating thezone 420 of the subterranean formation F from any well completion operations being conducted through theopen casing window 402 involving thezone 414. The fluid 408 may include any of the embodiments disclosed elsewhere herein. - In one embodiment, the fluid 408 is pumped through the fluid
jet forming nozzles 410 at a velocity sufficient forfluid jets 422 to formperforation tunnels 424. In one embodiment, after theperforation tunnels 424 are formed, the fluid 408 is pumped into theconduit 406 and through the fluidjet forming nozzles 410 at a pressure sufficient to form cracks orfractures 426 along theperforation tunnels 424. - Referring back to
FIG. 1 , a plurality of thesleeve assemblies 158 are included in thetubing section 134 of the treatment andcompletion apparatus 100. Thesleeve assemblies 158 are positioned adjacent the selected zones to be treated, such as the plurality of selectedzones work string 118 havingapparatus 100 is lowered into well bore 120, and theapparatus 100 is appropriately set, a first ball or other obturating member may be dropped into thework string 118. The ball seats in thelowermost sleeve assembly 158 to actuate, as described herein, the sleeve assembly and establish a fluid path to theformation zone 90. Then, a treatment fluid, such as an acidizing fluid or a fracturing fluid, may be flowed through thework string 118, thetubing section 134, the fluid path in the sleeve assembly, and toward thezone 90. In some embodiments, a high pressure fluid is communicated through the sleeve assembly fluid path to provide a hydrojet stream to thezone 90. As used herein, high pressure, for example, is generally greater than about 1,000 p.s.i., alternatively greater than about 3,500 p.s.i., alternatively greater than about 10,000 p.s.i., and alternatively greater than about 15,000 p.s.i. Once the selectedzone 90 has been treated, a second ball is dropped to engage the sleeve seat in thenext sleeve assembly 158 in ascending order, adjacent thezone 88. When the ball is seated, fluid flow is blocked to the lower sleeve assembly and fluid pressure will increase to actuate the new sleeve assembly. Thezone 88 can then be treated. This procedure may be followed to selectively and successively actuate thesleeve assemblies 158 in ascending order, and service any and/or all of thezones FIGS. 2B and 3B ) in each of thesleeve assemblies 158 is of a diameter 188 such that theballs 194 may pass therethrough to engage theseat sleeves 184 in sleeve assemblies therebelow. Therefore, the seat sleeve diameter 188 will be gradually and incrementally larger from the lowermost seat sleeve through the final seat sleeve in the uppermost sleeve assembly. - Referring now to
FIG. 6A , an assembly is shown that is adaptable to be used with the various sleeve assembly embodiments described herein. A sliding sleeve sub orindexing assembly 500 includes anouter sleeve 502 and aninner sleeve member 504 disposed therein. For reference purposes, theouter sleeve 502 is analogous to theopening sleeve 162 ofFIGS. 2A-3B . Theinner sleeve member 504 includes anupper end 506, alower end 508 and aflow bore 505 therethrough. Theupper end 506 includes an increaseddiameter portion 510 having an indexing slot or J-slot pattern 512 that receives acontrol lug 514 disposed on an inner surface of theouter sleeve 502. The interaction between thelug 514 and theindexing slot 512, as will be described in more detail hereinbelow, is the primary mode of communication between theouter sleeve 502 and theinner sleeve member 504. Thelower end 508 includes aprojection 522 and a series ofcollet fingers 524. Disposed between anouter sleeve shoulder 520 and aninner sleeve shoulder 518 is a biasingspring 516. The inner surface of theouter sleeve 502 also includes a recessedportion 526. - Referring next to
FIG. 6B , theindexing slot 512 is shown in an unwrapped or flattened profile view. Theindexing slot 512 may also be referred to as a continuous J-slot or a control groove. Theindexing slot 512 includes a plurality of biased, reset or stoppositions lug 514. Theslot 512 also includes a final engagement oractuation position 540. Theindexing slot 512 is disposed about the upper portion of the tube forming theinner sleeve 504. Theindexing slot 512, in some embodiments, may be a solid member, such as a metal sheet, having a slot or groove formed therein. The indexing slot may be shaped to extend around a cylindrical member, as is shown inFIG. 6A . In some embodiments described, thelug 514 includes a circular shape from a top view of the lug. The lug may include other shapes, such as an oval or elliptical shape. Furthermore, other control slot operating members may interact with theindexing slot 512 to provide the relationships described herein. - In operation, the
indexing assembly 500 is assembled as shown inFIG. 6A , with theinner sleeve 504 biased upward by thespring 516 such that thecollet fingers 524 and theprojection 526 are above therecess 526. Thecontrol lug 514 is initially disposed in one of the stop positions 530, 532, 534 and limits the upward movement of theinner sleeve 504. Preferably, the initial position of thelug 514 is the furthest from thefinal position 540 to allow the most number of cycles through the indexing slot, though the initial position can be selected to pre-determine the number of cycles through the indexing slot and thus the number of balls that pass through theinner sleeve 504. A first ball, such as that shown inFIG. 8 , passes through the flow bore 505 and arrives at aseat 542 in thelower end 508. A pressure buildup above the ball causes the inner sleeve to overcome the biasing force of thespring 516 and move downward, as similarly depicted inFIG. 9 . As theinner sleeve 504 moves downward, theprojection 526 slides into therecess 526 and the collet fingers expand into the recess, as shown inFIG. 9 . Simultaneously, theinner sleeve 504 and theindexing slot 512 are guided about thelug 514, which is stationary on theouter sleeve 502, such that the lug moves frominitial slot 530 to therelease position 536. The ball is then allowed to pass into the flow bore 544 below theinner sleeve 504. After the ball passes, the pressure on theinner sleeve 504 is relieved the biasing spring moves theinner sleeve 504 upward. At the same time, theinner sleeve 504 and theindexing slot 512 are guided about thelug 514 such that the lug is now placed in thestop position 532. - The
lug 514 is guided through any number of sets of stop and release positions until thelug 514 reaches thefinal position 540. In thefinal position 540, vertical movement of theinner sleeve 504 is restricted such that the pressure buildup in theinner sleeve 504 is transferred to theouter sleeve 502 and the overall sleeve assembly is actuated as described herein. For example, when thelug 514 is in thefinal position 540, theball seat 542 acts analogously to theball seat 190 in theseat ring 184 ofFIGS. 2B and 3B . Theouter sleeve 502 then moves similarly to thesleeve 162 of thesleeve assembly 158. Thus, theindexing assembly 500 can replace theseat ring 184 arrangement of thesleeve assembly 158 while providing increased flexibility forinner sleeve 504 movement and ball pass-through while the overall sleeve assembly remains unactuated. - The
indexing assembly 500 can be pre-set to count any number of ball pass-throughs. For example, if anindexing assembly 500 is placed in the second lowermost position, wherein another assembly is below it, and it is known that one ball must pass through theindexing assembly 500, then the assembly is adjusted accordingly. In one embodiment, theindexing slot 512 is simply manufactured to have theinitial position 532, therelease position 538, thereset position 534 and thefinal position 540. Therefore, one cycle fromposition 532 to position 538 toposition 534 allows one ball to pass through theindexing assembly 500 before thefinal position 540 is reached and the sleeve assembly is actuated. In another embodiment, theindexing slot 512 is manufactured to have any number of stop and release positions, and theindexing assembly 500 is assembled such that the initial position of thelug 514 is in the second to last stop position, orposition 532. - A plurality of
indexing assemblies 500 may be disposed in a tubing section in series, such as in the series ofstimulation sleeves 158 shown inFIG. 1 . The series ofindexing assemblies 500 will includeball seats 542 all having the same unexpanded diameter to receive the same size balls. For example, the diameter ofunexpanded ball seat 542 inFIG. 6A may be 2.75 inches, while the balls may be 3 inches in diameter. Eachassembly 500 can be pre-set to catch and release a different number of 3-inch balls such that the series of assemblies will actuate a series ofsleeve assemblies interest - In some embodiments, the
collet fingers 524 are dipped in stiffening or hardening agents for added strength or resistance. In one embodiment, thecollet fingers 524 are at rest in the contracted position shown inFIG. 6A , and the force of the ball passing through the collet fingers causes them to expand into therecess 526. Thesecollet fingers 524 may also be referred to as “normally closed” or “normally contracted.” In another embodiment, the collet fingers are formed and strengthened to normally be in the expanded position shown inFIG. 9 , such that the collet fingers are forced together as shown inFIG. 6A and allowed to spread automatically when placed in the position ofFIG. 9 . Thesecollet fingers 524 may also be referred to as “normally open” or “normally expanded.” In other embodiments, thecollet fingers 524 are dipped in an elastomer or other compressible material such that when the collet fingers are contracted as shown inFIG. 6A , the elastomer coating on one finger will compress against the elastomer coating on an adjacent finger to close the spaces between the fingers and provide a sealedball seat 542. - In an alternative embodiment, the
control lug 514 is disposed on the outer surface of theinner sleeve 504 and theindexing slot 512 is disposed on the inner surface of theouter sleeve 502, i.e., they are switched. In this embodiment, the profile view ofFIG. 6B would be flipped such that the stop positions would be on top and the release positions on bottom, and the final position would be on top. - With reference to
FIG. 7-11 , a further embodiment includes anindexing assembly 600 having similar components as theassembly 500, such as anouter sleeve 602 and aninner sleeve 604. However,assembly 600 further includes an upper recessedportion 627. In operation, aball 670 enters the flow bore 605 and arrives at theseat 642 as shown inFIG. 8 . The pressure buildup above theball 670 overcomes the biasing force provided by thespring 616 and moves theinner sleeve 604 downward. As shown inFIG. 9 , thecollet fingers 624 expand into therecess 626, either by the force provided by theball 670 or by the normally open disposition of the fingers, and theball 670 passes through thefingers 624 and theseat 642 to travel downward 650 through the flow bore 644. The biasing force of thespring 616 then returns theinner sleeve 604 to the middle position shown inFIG. 8 , readying theindexing assembly 600 to receive anotherball 670. During this process, thelug 614 andindexing slot 612 operate as previously described. - However, at some point, it may be desirable to return a ball or balls to the surface of the well. A ball may be forced upward along a
return path 660 in the flow bore 644 by fluid pressure or other means, and theindexing assembly 600 is adapted to work in reverse wherein theupper recess 627 receives the expandingcollet fingers 624 as shown inFIG. 10 . As shown inFIG. 11 , areserve position 648 is provided in theindexing slot 612 to accommodate the upward movement of theinner sleeve 604 as shown inFIG. 10 . For example, theindexing assembly 600 may be assembled such that thelug 614 is given aninitial position 630. Ball engagement on theseat 642 causes theinner sleeve 604 to move downward, and thus thelug 614 moves upward in theindexing slot 612 to thefirst release position 636. Theball 670 passes through thecollet fingers 624, thereby relieving the pressure in theinner sleeve 604. The biasingspring 616 returns theinner sleeve 604 and theindexing slot 612 to a position placing thelug 614 in afirst reset position 632. Anotherball 670 may be cycled through theinner sleeve 604, placing thelug 614 in asecond release position 638, then in asecond reset position 634 which is also the catch position.Position 634 is a catch position because thelug 614 is not allowed to move upward to a position similar topositions inner sleeve 604 and release of theball 670. The pressure buildup above theball 670 is transferred to theouter sleeve 602, which is the slidable sleeve of a larger sleeve assembly as described herein. However, unlikeindexing slot 512, theslot 612 provides anadditional position 648 that allows upward movement of theinner sleeve 604 to accommodate the return of theball 670 shown inFIG. 10 . Once the balls have been returned as described, the well can be produced unobstructed and without intervention to drill out the ball-engaged indexing and sleeve assemblies. In other embodiments, the balls or other obturating members are breakable or dissolvable to remove them from the inner flow bores. - In other embodiments, the total number of reset and release positions is adjusted to increase or decrease the number of balls the indexing assemblies are designed to catch and release. For example, the
indexing slots - The number of zones, indexing assemblies and sleeve assemblies shown herein is not intended to be limiting and is shown only for exemplary purposes. Any desired number of zones may be treated or produced. The plurality of zones will be treated sequentially upwardly. For example, when a sleeve assembly is moved to align openings, dissolving fluid and then treatment fluid may be flowed into the zone to be treated, and the next zone desired to be treated is done so in the manner described. Once the selected zones have been treated, the balls can be flowed back to the surface, as previously described, or drilled out and the well can be produced through each of the selected zones in a manner known in the art.
- In alternative embodiments, the
mechanical assemblies indexing slots indexing slots indexing slots - In addition to servicing, treatment and completion systems, the embodiments of the indexing or sliding sleeve assemblies can be used in other systems. For example, a system including a series open-hole packer can incorporate the indexing or sliding sleeve assemblies for successive actuation of the packers.
- While specific embodiments have been shown and described, modifications can be made by one skilled in the art without departing from the spirit or teaching of this invention. The embodiments as described are exemplary only and are not limiting. Many variations and modifications are possible and are within the scope of the invention. Accordingly, the scope of protection is not limited to the embodiments described, but is only limited by the claims that follow, the scope of which shall include all equivalents of the subject matter of the claims.
Claims (26)
1. A well bore servicing apparatus comprising:
an first sleeve slidably disposed in a tubing section;
an second sleeve slidably disposed in the first sleeve;
an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot; and
an expandable seat disposed in the inner sleeve to receive a plurality of obturating members.
2. The apparatus of claim 1 wherein the lug is disposed within the indexing slot to guide relative movement between the first sleeve and the second sleeve.
3. The apparatus of claim 1 wherein the plurality of obturating members are the same size.
4. The apparatus of claim 2 wherein the indexing slot includes a plurality of stop positions and a plurality of release positions for the lug.
5. The apparatus of claim 4 wherein the plurality of stop positions correspond to a contracted position of the expandable seat and the plurality of release positions correspond to an expanded position of the expandable seat for passing through the plurality of obturating members.
6. The apparatus of claim 1 wherein the expandable seat includes a plurality of collet fingers.
7. The apparatus of claim 6 wherein the collet fingers are normally open.
8. The apparatus of claim 6 wherein the collet fingers are normally closed.
9. The apparatus of claim 6 wherein the collet fingers are dipped or coated.
10. A well bore servicing apparatus comprising:
a work string;
a tubing section coupled to the work string;
a plurality of sleeve assemblies disposed in the tubing section; and
a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies;
wherein the plurality of seats are substantially the same size.
11. The apparatus of claim 10 wherein the seats are operable to receive a series of obturating members having substantially the same size.
12. The apparatus of claim 11 wherein the series of obturating members are operable to successively actuate the plurality of sleeve assemblies adjacent multiple formation zones.
13. The apparatus of claim 10 wherein the tubing section having the plurality of sleeve assemblies includes a substantially uniform minimum flow bore diameter over its axial length.
14. The apparatus of claim 10 wherein all sleeve assemblies disposed in the tubing section are actuatable by the same size obturating member.
15. The apparatus of claim 10 further comprising an indexing slot and a corresponding control lug disposed in each of the sleeve assemblies.
16. The apparatus of claim 15 wherein the control lugs communicate with positions in the indexing slot to count the number of obturating members that pass through an inner sleeve assembly.
17. The apparatus of claim 10 further including an electronic counter operable to detect the obturating member.
18. The apparatus of claim 10 further including a drive means coupled to an indexing assembly in each of the sleeve assemblies.
19. The apparatus of claim 11 further comprising an electronic tag in each of the obturating members, an electronic counter in each of an inner sleeve assembly disposed in each of the sleeve assemblies, and an electro-mechanical actuator coupled to the inner sleeves.
20. A method of servicing a well bore comprising:
disposing a tubing section in the well bore;
positioning the tubing section adjacent a plurality of formation zones;
passing a first obturating member through a first moveable sleeve;
catching the first obturating member in a second moveable sleeve to actuate a sleeve assembly adjacent a first formation zone; and
catching a second obturating member in the first moveable sleeve to actuate a second sleeve assembly adjacent a second formation zone;
wherein the first and second obturating members are substantially the same size.
21. The method of claim 20 further comprising passing a plurality of same-size obturating members through the first moveable sleeve and actuating a plurality of sleeve assemblies below the first moveable sleeve with the same-size obturating members.
22. A method of servicing a well bore comprising:
placing a tubing section in the well bore via a work string; and
actuating a plurality of sleeve assemblies in the tubing section with same-size obturating members.
23. The method of claim 22 further comprising pumping a treatment fluid through a flow bore in the tubing section having a substantially uniform inner diameter.
24. The method of claim 22 further comprising maintaining constant flow rates over the axial length of the tubing section having the plurality of sleeve assemblies.
25. The method of claim 22 further comprising maintaining constant treatment pressures over the axial length of the tubing section having the plurality of sleeve assemblies.
26. A method of servicing a well bore comprising:
disposing a tubing section having a plurality of actuatable sleeve assemblies in the well bore;
providing a series of obturating members having substantially the same size to actuate the sleeve assemblies; and
successively actuating the sleeve assemblies with the same-size obturating member to successively treat a plurality of formation zones.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/139,604 US20090308588A1 (en) | 2008-06-16 | 2008-06-16 | Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones |
CA002668129A CA2668129A1 (en) | 2008-06-16 | 2009-06-03 | Method and apparatus for exposing a servicing apparatus to multiple formation zones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/139,604 US20090308588A1 (en) | 2008-06-16 | 2008-06-16 | Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones |
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US20090308588A1 true US20090308588A1 (en) | 2009-12-17 |
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US12/139,604 Abandoned US20090308588A1 (en) | 2008-06-16 | 2008-06-16 | Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones |
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