US20100294514A1 - Selective plug and method - Google Patents
Selective plug and method Download PDFInfo
- Publication number
- US20100294514A1 US20100294514A1 US12/470,927 US47092709A US2010294514A1 US 20100294514 A1 US20100294514 A1 US 20100294514A1 US 47092709 A US47092709 A US 47092709A US 2010294514 A1 US2010294514 A1 US 2010294514A1
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- Prior art keywords
- plug
- selective
- selective plug
- borehole
- restriction
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- 238000000034 method Methods 0.000 title claims abstract description 5
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 9
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- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
-
- 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
Definitions
- fracturing operation In order to perform such an operation, hydraulic pressure is built within a tubing string until the pressure exceeds formation capability for holding that pressure and fractures form in the formation. This type of operation is most effective if done in small incremental sections of a borehole for reasons related to control and distribution of fractures to serve the ultimate purpose of the borehole. Such purposes include hydrocarbon production, CO2 sequestration, etc.
- fracturing discrete locations of the borehole tends to require a number of tools that increase expense initially and generally create other issues to be overcome after the fracturing process is complete such as removal of the tools that enabled the pressuring of a discrete location.
- a staged system must be built and administered correctly for it to work.
- One such system uses progressively larger seat diameters from the toe back to surface and then progressively increasing diameter balls. While the system works well, it is limited by the number of different size balls that can be used. Tolerance is required in any system and therefore limits the number of diameters that will be functional even further.
- a selective plug including a body; and an incrementing configuration in operable communication with the body capable of causing the plug to selectively pass a number of borehole restrictions to reach and engage a target restriction.
- a method for conducting borehole operations including determining where in a borehole an operation is desired; setting a selective plug; and deploying the selective plug into the borehole.
- FIG. 1 is a schematic cross sectional view of a selective plug described herein;
- FIG. 2 is a schematic cross sectional view of another embodiment of a selective plug described herein;
- FIG. 3 is a schematic cross sectional view of yet another embodiment of a selective plug as described herein;
- FIG. 4 is a perspective partial phantom view of the embodiment of FIG. 3 ;
- FIG. 5 is another perspective cross sectional view of the embodiment of FIG. 3 .
- a selective plug 10 is illustrated.
- the plug 10 is settable to pass through a number of restrictions (one shown as 12 ) in a borehole.
- the restriction 12 will protrude radially inwardly from a casing 14 but the invention is not limited to cased boreholes but rather is usable in any borehole configuration where restrictions are employed.
- the plug itself comprises a body 16 sized to be able to pass through restrictions in the borehole in which the plug is intended to be employed.
- the body supports a seal member 18 at an outside surface 20 thereof, the seal member intended to provide a pressure tight interaction with the target restriction 12 .
- the degree of sealing required depends upon the degree of pressure that is intended to be applied to the borehole system, the higher the intended pressure the higher the contact force of the seal member 18 with the restriction 12 and hence the more robust the pressure seal.
- the body 16 further includes openings 22 (two shown but more may be disposed about the periphery of the body 16 ).
- the openings 22 allow for the through passage of rotationally secured keys 24 .
- the keys are interactive with the restrictions(s) 12 as a rotational axis 26 of each key comes into proximity with the restriction 12 .
- one of the keys 24 is illustrated in contact with the restriction 12 .
- Each of the keys 24 includes a biasing arrangement 25 at the rotational axis 26 to cause the key to move to a position where engagement with a next restriction will occur.
- the other side of the key is in communication with a ratchet housing 28 where a plurality of ratchet teeth 30 are positioned.
- the keys and the ratchet housing together form an incrementing configuration. It is to be appreciated that a number of ratchet teeth are illustrated but that in a commercial embodiment there may be many more. The number of ratchet teeth must be enough to allow incremental movement of the ratchet housing 28 through all of the restrictions that will be passed through. In one embodiment, there will be at least as many teeth as all the restrictions in a particular or a hypothetical borehole. Either way the point is that with enough teeth 30 it is possible to set the plug to pass as many restrictions as desired even if the target restriction is the deepest one in the borehole. This will be more clear when operation of the plug is discussed.
- the ratchet housing 28 includes a dampener 32 comprising in one embodiment, a fluid chamber 34 and a piston 36 bifurcating the fluid chamber 34 .
- the piston includes a flow passage 38 having a relatively restricted dimension through which fluid may pass from one end of the piston to the other end of the piston thereby moving the fluid in the fluid chamber 34 from one side of the piston to the other during operation of the plug 10 .
- the function of the dampener 32 is to slow the reaction of the keys 24 when they rotate due to contact with a restriction 12 . This causes a pressure spike uphole of the plug 10 that can be detected to verify that the plug 10 has encountered a restriction. Counting the verification events then provides confidence that when the plug does land without passing a restriction, it is the correct target restriction.
- dampener provides for desirable functionality, it is not required for the plug to operate with respect to its primary objective, which is to selectively pass a number of restrictions and to not pass a target restriction.
- the plug 10 will do so whether or not a pressure spike is produced or received at a remote location.
- a variation of its structure allows for easier setting of the plug 10 by including a check valve 40 , which provides a much greater flow area for movement of the piston 36 in a setting direction than it does for piston movement during operation of the plug 10 .
- the plug 10 includes a selection indicator 42 .
- An operator uses the indicator to set the plug 10 to bypass a number of restrictions that will cause the plug to set in the target restriction.
- Operation of the plug illustrated in FIG. 1 begins with the setting of the number of restrictions that are to be passed in a borehole.
- the ratchet housing 28 is moved within the body 16 to set one or more of the keys 24 in a position between two of the teeth 30 . Selecting a position means that a leading end 44 of ratchet housing 28 is spaced a certain distance from an inside surface 46 of body 16 .
- the ratchet housing 28 is physically prevented from moving further and hence the keys are physically prevented from rotating further.
- At least one other of the keys 24 is offset from the first discussed key 24 . This allows the second key 24 to engage the next one of the plurality of teeth 30 when the first discussed one of the plurality of teeth is still resting on a crown of the last actuated one of the plurality of teeth. Following another rotational change in key 24 position the first key will come off the crest of the tooth it was resting on and drop into the next trough between two of the plurality of teeth 30 . From this position the key is again positioned to have effect on the ratchet housing 28 at the next restriction 12 .
- the number of keys that are being used to move the ratchet housing 28 at a given restriction can be as few as one or as many as is practicable in the space available in the body 16 depending upon desires for particular applications.
- the keys each return to the position where engagement with teeth and restriction is possible via the biasing arrangement 25 such as a torsion spring.
- the ratchet housing 28 is moved such that end 44 moves away from surface 46 during setting of the plug 10 .
- a specific embodiment of the dampener 32 includes the check valve 40 noted above. Due to the increased flow area that is gained through the check valve 40 , an operator moving the ratchet housing 28 for setting purposes will not have to work as hard as he or she would if the check valve were not present (which is certainly contemplated in some embodiments).
- a body 116 includes one or more openings 122 (one shown) where in each of which is a key 124 that is articulated to the body 116 at pivot 150 .
- the key further includes an articulated lever 152 that is configured to engage one of a plurality of teeth 130 .
- two keys 124 a and 124 b and two accompanying levers 152 a and 152 b are spaced axially from one another to enable the counting function of the plug 110 .
- the one or more keys that are included in the plug 110 are in one embodiment arranged around the body 116 . It is not intended that the reader presume that because the illustrated keys 124 are axially arranged that all of the possible keys 124 that may be incorporated in the embodiment would be axially arranged. It is also not necessarily required that there be axially spaced keys but rather that there be a mechanism to hold the spring 158 while a key that has urged the ratchet housing 128 toward the right hand side of the drawing in FIG.
- the body 116 further includes one or more dogs 154 that are extendible radially outwardly of the body 116 under circumstances of actuation of the plug 110 .
- the teeth 130 are positioned upon a ratchet housing 128 .
- the ratchet housing further includes a one or more dog supports 156 thereon that at a particular position of the ratchet housing 128 will support the dogs 154 in a radially outwardly extended position. This position is achieved when the ratchet housing 128 is fully stroked within the body 116 by having passed through the selected number of restrictions 12 .
- a biasing arrangement 158 is included such as a compression spring that bears against one end of the body 116 and one end of the ratchet housing 128 as illustrated.
- a wiper 160 is disposed to enable the plug 110 to be moved through the borehole using fluid pressure applied from uphole and a selection indicator 142 to assist the operator in setting the plug 110 to bypass a denied number of restrictions.
- the plug 110 is initially manually set at a surface location by an operator.
- the ratchet housing 128 is positioned relative to the body 116 such that a selected number of teeth 130 are required to be ratcheted through before the dog support 156 moves to support the dogs 154 .
- the number of teeth is the same as the number of restrictions through which the plug is being set to pass before it is to hold its position to support another operation such as a fluid pressure build up uphole of the plug 110 for tool actuation or fracturing, etc. Because the biasing arrangement 158 applies a force on the ratchet housing 128 in a direction to the left in the drawing FIG. 2 , the lever 152 is caught in a trough of the teeth 130 .
- the lever is hence urged by the tooth it is engaged with against the key 124 a causing the key to pivot radially outwardly of the body 116 .
- the radial dimension of the one or more keys 124 is greater than the restrictions that the plug 110 will encounter during its trip downhole.
- the key(s) 124 will thus land on the restrictions 12 that it/they arrive at and be urged radially inwardly by the restriction.
- the radially inward urging causes the lever 152 a to apply a force to the tooth with which it is engaged overcoming the oppositely acting force from the biasing arrangement 158 and thereby moving the ratchet housing 128 toward end 162 of body 116 .
- the movement is incremental but is for a sufficient distance to allow lever 152 b to engaged its next-in-line tooth 130 to hold the new position that the key 124 a and lever 152 a passing through the restriction have achieved for the ratchet housing 128 .
- the keys 124 a and 124 b and 152 a and 152 b together act as an escapement to facilitate maintenance of the ratchet housing 128 in its incremental position.
- the key 124 a will move radially outwardly again based upon a torsion spring disposed at pivot 150 or similar making it ready to engage the next restriction 12 .
- a selective plug 210 having the same capabilities as the plugs described hereinbefore is illustrated.
- This embodiment includes a body 216 having a flared end 264 .
- the flared end is in one embodiment includes ramped surfaces 266 and 268 .
- Surface 266 assists in directing the plug 210 trough a restriction by avoiding a sharp shoulder that otherwise might catch on a portion of the restriction 12 while surface 268 cooperates with a collet 270 in the operation of the plug 210 as will be further elucidated hereunder.
- a wiper 260 is positioned at an opposite end of the body 216 from the flared end 264 .
- a key 224 that is interactive with a rotator 276 in operation of the plug 210 .
- the key 224 further provides a seat 274 for a biasing arrangement 258 .
- the biasing arrangement will in one embodiment comprise a compression spring such as a coil spring as shown.
- the biasing arrangement 258 acts between the seat 274 and the collet 270 , urging the two apart from one another.
- the rotator 276 is disposed between the collet 270 and the body 216 and provides, in one embodiment, the selectivity in target restriction in cooperation with key 224 .
- a selection indicator 242 is also provided for purposes identical to those described above.
- the plug 210 will be set by positioning the rotator 276 relative to the key 224 and then introduced to the borehole.
- the collet 270 lands on the restriction 12 and a load is transferred into the collet 270 .
- the load provides a greater force than does the biasing arrangement 258 and so the collet moves relative to the body 216 allowing the flared end 264 of the body 216 to move through the restriction and at the same time unsupport one or more collet fingers 278 .
- the fingers 278 Once the fingers 278 are unsupported they will flex radially inwardly causing the outside diameter of the collet 270 at fingers 278 to become smaller than the restriction and therefore move therethrough. At each restriction this movement is possible thereby allowing the plug 210 to pass through an unlimited number of restrictions. To limit the number of restrictions through which the plug 210 will pass and thereby select a target restriction upon which the plug 210 will seat for a period of time, the rotator 276 and key 224 are included in the plug 210 .
- Rotator 276 is, in one embodiment, configured with a J-slot 280 on an outside dimension surface thereof and a plurality of step profile teeth 282 on an inside dimension surface thereof ( FIG. 5 ).
- the Jslot 280 interacts with a lug 284 attached to the collet 270 .
- the lug 284 contacts an angled surface 286 of the Jslot 280 and causes the rotator 276 to rotate a small degree.
- the lug will contact another angled surface 288 and the rotator will rotate another small increment.
- a selected number of restrictions 12 will be passed before the key 224 engages a step of the step profile 282 and prevents the collet 270 from cycling. Upon this condition, the next restriction encountered by the plug 210 will not be passed but the plug 210 will seat thereon and whatever operation was intended may be carried out.
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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- Earth Drilling (AREA)
Abstract
A selective plug including a body; and an incrementing configuration in operable communication with the body capable of causing the plug to selectively pass a number of borehole restrictions to reach and engage a target restriction and method.
Description
- In the Drilling and completion industries it is often desirable to affect tools or formations at a great distance from a surface located facility such as a rig. One example of an operation intended to affect a formation is a fracturing operation. In order to perform such an operation, hydraulic pressure is built within a tubing string until the pressure exceeds formation capability for holding that pressure and fractures form in the formation. This type of operation is most effective if done in small incremental sections of a borehole for reasons related to control and distribution of fractures to serve the ultimate purpose of the borehole. Such purposes include hydrocarbon production, CO2 sequestration, etc.
- In the art, fracturing discrete locations of the borehole tends to require a number of tools that increase expense initially and generally create other issues to be overcome after the fracturing process is complete such as removal of the tools that enabled the pressuring of a discrete location. Where multiple fracturing locations are contemplated, generally a staged system must be built and administered correctly for it to work. One such system uses progressively larger seat diameters from the toe back to surface and then progressively increasing diameter balls. While the system works well, it is limited by the number of different size balls that can be used. Tolerance is required in any system and therefore limits the number of diameters that will be functional even further.
- Since fracturing and other operations where discrete locations are desired to be isolated or accessed continue to become more prevalent and ubiquitous, alternate systems for accessing and manipulating the downhole environment is always well received.
- A selective plug including a body; and an incrementing configuration in operable communication with the body capable of causing the plug to selectively pass a number of borehole restrictions to reach and engage a target restriction.
- A method for conducting borehole operations including determining where in a borehole an operation is desired; setting a selective plug; and deploying the selective plug into the borehole.
- Referring now to the drawings wherein like elements are numbered alike in the Figures:
-
FIG. 1 is a schematic cross sectional view of a selective plug described herein; -
FIG. 2 is a schematic cross sectional view of another embodiment of a selective plug described herein; -
FIG. 3 is a schematic cross sectional view of yet another embodiment of a selective plug as described herein; -
FIG. 4 is a perspective partial phantom view of the embodiment ofFIG. 3 ; and -
FIG. 5 is another perspective cross sectional view of the embodiment ofFIG. 3 . - Referring to
FIG. 1 , aselective plug 10 is illustrated. Theplug 10 is settable to pass through a number of restrictions (one shown as 12) in a borehole. Generally therestriction 12 will protrude radially inwardly from acasing 14 but the invention is not limited to cased boreholes but rather is usable in any borehole configuration where restrictions are employed. The plug itself comprises abody 16 sized to be able to pass through restrictions in the borehole in which the plug is intended to be employed. The body supports aseal member 18 at anoutside surface 20 thereof, the seal member intended to provide a pressure tight interaction with thetarget restriction 12. The degree of sealing required depends upon the degree of pressure that is intended to be applied to the borehole system, the higher the intended pressure the higher the contact force of theseal member 18 with therestriction 12 and hence the more robust the pressure seal. - The
body 16 further includes openings 22 (two shown but more may be disposed about the periphery of the body 16). Theopenings 22 allow for the through passage of rotationally securedkeys 24. The keys are interactive with the restrictions(s) 12 as arotational axis 26 of each key comes into proximity with therestriction 12. As can be viewed inFIG. 1 , one of thekeys 24 is illustrated in contact with therestriction 12. Each of thekeys 24 includes abiasing arrangement 25 at therotational axis 26 to cause the key to move to a position where engagement with a next restriction will occur. The other side of the key is in communication with aratchet housing 28 where a plurality ofratchet teeth 30 are positioned. The keys and the ratchet housing together form an incrementing configuration. It is to be appreciated that a number of ratchet teeth are illustrated but that in a commercial embodiment there may be many more. The number of ratchet teeth must be enough to allow incremental movement of the ratchet housing 28 through all of the restrictions that will be passed through. In one embodiment, there will be at least as many teeth as all the restrictions in a particular or a hypothetical borehole. Either way the point is that withenough teeth 30 it is possible to set the plug to pass as many restrictions as desired even if the target restriction is the deepest one in the borehole. This will be more clear when operation of the plug is discussed. - Finally, the
ratchet housing 28 includes adampener 32 comprising in one embodiment, afluid chamber 34 and apiston 36 bifurcating thefluid chamber 34. The piston includes aflow passage 38 having a relatively restricted dimension through which fluid may pass from one end of the piston to the other end of the piston thereby moving the fluid in thefluid chamber 34 from one side of the piston to the other during operation of theplug 10. The function of thedampener 32 is to slow the reaction of thekeys 24 when they rotate due to contact with arestriction 12. This causes a pressure spike uphole of theplug 10 that can be detected to verify that theplug 10 has encountered a restriction. Counting the verification events then provides confidence that when the plug does land without passing a restriction, it is the correct target restriction. It is to be appreciated that although the dampener provides for desirable functionality, it is not required for the plug to operate with respect to its primary objective, which is to selectively pass a number of restrictions and to not pass a target restriction. Theplug 10 will do so whether or not a pressure spike is produced or received at a remote location. - In embodiments that do include the dampener 32 a variation of its structure allows for easier setting of the
plug 10 by including acheck valve 40, which provides a much greater flow area for movement of thepiston 36 in a setting direction than it does for piston movement during operation of theplug 10. - Finally the
plug 10 includes aselection indicator 42. An operator uses the indicator to set theplug 10 to bypass a number of restrictions that will cause the plug to set in the target restriction. - Operation of the plug illustrated in
FIG. 1 begins with the setting of the number of restrictions that are to be passed in a borehole. Theratchet housing 28 is moved within thebody 16 to set one or more of thekeys 24 in a position between two of theteeth 30. Selecting a position means that a leadingend 44 ofratchet housing 28 is spaced a certain distance from aninside surface 46 ofbody 16. When the distance is absorbed by movement of the ratchet housing 28 pursuant to the action ofkeys 24 while passingrestrictions 12, theratchet housing 28 is physically prevented from moving further and hence the keys are physically prevented from rotating further. Whateverkey 24 that is in contact with atarget restriction 12 at this time will prevent further advancement of theplug 10 and the borehole is ready for pressurization to whatever extent has been designed into theplug 10. The distance betweenend 44 andsurface 46 is slowly absorbed by the movement of the ratchet housing 28 because as eachkey 24 engages a restriction, a force is placed upon the key. Because the key is allowed to move about arotational axis 26 the force acting on thekey 24 from the restriction is transmitted through the key torotational axis 26. Therotational axis 26 changes the direction of the force to apply it to one of the plurality ofteeth 30 thereby pushing theratchet housing 28 towardsurface 46. This action continues until the angle of thekey 24 has exhausted it force providing potential through rotation. As will be appreciated from the Figure, at least one other of thekeys 24 is offset from the first discussedkey 24. This allows thesecond key 24 to engage the next one of the plurality ofteeth 30 when the first discussed one of the plurality of teeth is still resting on a crown of the last actuated one of the plurality of teeth. Following another rotational change in key 24 position the first key will come off the crest of the tooth it was resting on and drop into the next trough between two of the plurality ofteeth 30. From this position the key is again positioned to have effect on the ratchet housing 28 at thenext restriction 12. The number of keys that are being used to move theratchet housing 28 at a given restriction can be as few as one or as many as is practicable in the space available in thebody 16 depending upon desires for particular applications. The keys each return to the position where engagement with teeth and restriction is possible via the biasingarrangement 25 such as a torsion spring. - As noted above, the
ratchet housing 28 is moved such thatend 44 moves away fromsurface 46 during setting of theplug 10. In embodiments wheredampener 32 is employed a specific embodiment of thedampener 32 includes thecheck valve 40 noted above. Due to the increased flow area that is gained through thecheck valve 40, an operator moving theratchet housing 28 for setting purposes will not have to work as hard as he or she would if the check valve were not present (which is certainly contemplated in some embodiments). - In another embodiment of a
selective plug 110, referring toFIG. 2 , the same ultimate goal of producing a plug that will bypass a selected number of restrictions before remaining in one for some period of time is accomplished. Similar to the foregoing embodiment there are a number ofrestrictions 12 in a borehole that may be cased or open providing there is a mechanism for providingrestrictions 12. In the embodiment ofFIG. 2 , abody 116 includes one or more openings 122 (one shown) where in each of which is a key 124 that is articulated to thebody 116 atpivot 150. The key further includes an articulated lever 152 that is configured to engage one of a plurality ofteeth 130. As illustrated there are twokeys levers plug 110. It is important to note that the one or more keys that are included in theplug 110 are in one embodiment arranged around thebody 116. It is not intended that the reader presume that because the illustrated keys 124 are axially arranged that all of the possible keys 124 that may be incorporated in the embodiment would be axially arranged. It is also not necessarily required that there be axially spaced keys but rather that there be a mechanism to hold thespring 158 while a key that has urged theratchet housing 128 toward the right hand side of the drawing inFIG. 2 moves to a reset position, having emerged from the compression of therestriction 12. This will be further described hereunder. Thebody 116 further includes one ormore dogs 154 that are extendible radially outwardly of thebody 116 under circumstances of actuation of theplug 110. - The
teeth 130 are positioned upon aratchet housing 128. The ratchet housing further includes a one or more dog supports 156 thereon that at a particular position of theratchet housing 128 will support thedogs 154 in a radially outwardly extended position. This position is achieved when theratchet housing 128 is fully stroked within thebody 116 by having passed through the selected number ofrestrictions 12. To ensure that theratchet housing 128 moves by only one tooth increment per restriction passed, a biasingarrangement 158 is included such as a compression spring that bears against one end of thebody 116 and one end of theratchet housing 128 as illustrated. These components make up an incrementing configuration for this embodiment. - Finally, at an uphole end of the ratchet housing, a
wiper 160 is disposed to enable theplug 110 to be moved through the borehole using fluid pressure applied from uphole and aselection indicator 142 to assist the operator in setting theplug 110 to bypass a denied number of restrictions. - In operation, the
plug 110 is initially manually set at a surface location by an operator. Theratchet housing 128 is positioned relative to thebody 116 such that a selected number ofteeth 130 are required to be ratcheted through before thedog support 156 moves to support thedogs 154. The number of teeth is the same as the number of restrictions through which the plug is being set to pass before it is to hold its position to support another operation such as a fluid pressure build up uphole of theplug 110 for tool actuation or fracturing, etc. Because the biasingarrangement 158 applies a force on theratchet housing 128 in a direction to the left in the drawingFIG. 2 , the lever 152 is caught in a trough of theteeth 130. The lever is hence urged by the tooth it is engaged with against the key 124 a causing the key to pivot radially outwardly of thebody 116. The radial dimension of the one or more keys 124 is greater than the restrictions that theplug 110 will encounter during its trip downhole. The key(s) 124 will thus land on therestrictions 12 that it/they arrive at and be urged radially inwardly by the restriction. The radially inward urging causes thelever 152 a to apply a force to the tooth with which it is engaged overcoming the oppositely acting force from the biasingarrangement 158 and thereby moving theratchet housing 128 toward end 162 ofbody 116. The movement is incremental but is for a sufficient distance to allowlever 152 b to engaged its next-in-line tooth 130 to hold the new position that the key 124 a andlever 152 a passing through the restriction have achieved for theratchet housing 128. Because of the positioning of thekeys levers keys ratchet housing 128 in its incremental position. The key 124 a will move radially outwardly again based upon a torsion spring disposed atpivot 150 or similar making it ready to engage thenext restriction 12. The same is true for key 124 b. The described sequence continues until thedog support 156 arrives at thedogs 154 and supports them. The next restriction through which theplug 110 is moved will encounter the supported dogs 154. Since thedogs 154 do not yield to therestriction 12, theplug 110 will maintain its position in the target restriction to allow whatever fluid pressure holding operation is desired. - In yet another embodiment, referring to
FIGS. 3-5 , aselective plug 210 having the same capabilities as the plugs described hereinbefore is illustrated. This embodiment includes abody 216 having a flaredend 264. The flared end is in one embodiment includes rampedsurfaces 266 and 268. Surface 266 assists in directing theplug 210 trough a restriction by avoiding a sharp shoulder that otherwise might catch on a portion of therestriction 12 whilesurface 268 cooperates with acollet 270 in the operation of theplug 210 as will be further elucidated hereunder. Awiper 260 is positioned at an opposite end of thebody 216 from the flaredend 264. - Upon the
body 216 is mounted a key 224 that is interactive with arotator 276 in operation of theplug 210. The key 224 further provides aseat 274 for abiasing arrangement 258. The biasing arrangement will in one embodiment comprise a compression spring such as a coil spring as shown. The biasingarrangement 258 acts between theseat 274 and thecollet 270, urging the two apart from one another. - The
rotator 276 is disposed between thecollet 270 and thebody 216 and provides, in one embodiment, the selectivity in target restriction in cooperation withkey 224. Aselection indicator 242 is also provided for purposes identical to those described above. - Before making reference to
FIGS. 4 and 5 to illustrate therotator 276 and the key 224 interaction, it is helpful to understand the high level operation of the plug. Theplug 210 will be set by positioning therotator 276 relative to the key 224 and then introduced to the borehole. When theplug 210 encounters arestriction 12, thecollet 270 lands on therestriction 12 and a load is transferred into thecollet 270. The load provides a greater force than does the biasingarrangement 258 and so the collet moves relative to thebody 216 allowing the flaredend 264 of thebody 216 to move through the restriction and at the same time unsupport one ormore collet fingers 278. Once thefingers 278 are unsupported they will flex radially inwardly causing the outside diameter of thecollet 270 atfingers 278 to become smaller than the restriction and therefore move therethrough. At each restriction this movement is possible thereby allowing theplug 210 to pass through an unlimited number of restrictions. To limit the number of restrictions through which theplug 210 will pass and thereby select a target restriction upon which theplug 210 will seat for a period of time, therotator 276 and key 224 are included in theplug 210. - Referring now to
FIGS. 4 and 5 , understanding of therotator 276 and key 224 and how they interact to produce an incrementing configuration will improve. In FIG. 4, thecollet 270 has been illustrated in phantom to allow a viewer to see therotator 276.Rotator 276 is, in one embodiment, configured with a J-slot 280 on an outside dimension surface thereof and a plurality ofstep profile teeth 282 on an inside dimension surface thereof (FIG. 5 ). TheJslot 280 interacts with alug 284 attached to thecollet 270. Each time thecollet 270 is urged against the bias of biasingarrangement 258, thelug 284 contacts anangled surface 286 of theJslot 280 and causes therotator 276 to rotate a small degree. Each time thecollet 270 moves back toward the flaredend 264, the lug will contact anotherangled surface 288 and the rotator will rotate another small increment. Based upon the position of thestep profile 282 relative to the key 224, a selected number ofrestrictions 12 will be passed before the key 224 engages a step of thestep profile 282 and prevents thecollet 270 from cycling. Upon this condition, the next restriction encountered by theplug 210 will not be passed but theplug 210 will seat thereon and whatever operation was intended may be carried out. - Finally it is to be understood while one or more embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
Claims (19)
1. A selective plug comprising: a body; and
an incrementing configuration in operable communication with the body capable of causing the plug to selectively pass a number of borehole restrictions to reach and engage a target restriction.
2. The selective plug as claimed in claim 1 wherein the incrementing configuration comprises a ratchet housing.
3. The selective plug as claimed in claim 1 wherein the ratchet housing includes a plurality of teeth.
4. The selective plug as claimed in claim 3 wherein one or more keys mounted at the body contact one or more of the plurality of teeth at least some of the time while the plug is in use.
5. The selective plug as claimed in claim 1 wherein the incrementing configuration increments each time the plug passes a restriction in a borehole while the plug is in use.
6. The selective plug as claimed in claim 1 wherein one or more keys mounted at the body are positioned to contact a restriction encountered by the plug and transmit a force of the contact to a ratchet housing to increment the ratchet housing within the body.
7. The selective plug as claimed in claim 6 wherein one or more of the one or more keys includes a lever responsive to key movement to transfer force to the ratchet housing.
8. The selective plug as claimed in claim 4 wherein the one or more keys are biased to an operable position.
9. The selective plug as claimed in claim 8 wherein the one or more keys are biased by a spring.
10. The selective plug as claimed in claim 9 wherein the spring is a torsion spring.
11. The selective plug as claimed in claim 1 wherein the incrementing configuration includes a biasing arrangement.
12. The selective plug as claimed in claim 11 wherein the biasing arrangement is a spring
13. The selective plug as claimed in claim 1 wherein the incrementing configuration further includes a dampener.
14. The selective plug as claimed in claim 13 wherein the dampener comprises a fluid chamber bifurcated by a piston having a flow orifice therethrough.
15. The selective plug as claimed in claim 14 wherein the piston further includes a check valve to reduce force necessary to move the piston through the chamber in one direction.
16. The selective plug as claimed in claim 1 wherein the incrementing configuration includes a selection indicator.
17. The selective plug as claimed in claim 1 wherein the body includes a seal member positioned to interact with a restriction in a borehole to create a pressure seal.
18. The selective plug as claimed in claim 6 wherein the one or more keys are offset relative to one another in the body.
19. A method for conducting borehole operations comprising:
determining where in a borehole an operation is desired;
setting a selective plug; and
deploying the selective plug into the borehole.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/470,927 US20100294514A1 (en) | 2009-05-22 | 2009-05-22 | Selective plug and method |
PCT/US2010/034736 WO2010135149A2 (en) | 2009-05-22 | 2010-05-13 | Selective plug and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/470,927 US20100294514A1 (en) | 2009-05-22 | 2009-05-22 | Selective plug and method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100294514A1 true US20100294514A1 (en) | 2010-11-25 |
Family
ID=43123802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/470,927 Abandoned US20100294514A1 (en) | 2009-05-22 | 2009-05-22 | Selective plug and method |
Country Status (2)
Country | Link |
---|---|
US (1) | US20100294514A1 (en) |
WO (1) | WO2010135149A2 (en) |
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WO2010135149A2 (en) | 2010-11-25 |
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