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Número de publicaciónUS2679903 A
Tipo de publicaciónConcesión
Fecha de publicación1 Jun 1954
Fecha de presentación23 Nov 1949
Fecha de prioridad23 Nov 1949
Número de publicaciónUS 2679903 A, US 2679903A, US-A-2679903, US2679903 A, US2679903A
InventoresMcgowen Jr Harold E, Moore Jr Howard H
Cesionario originalSid W Richardson Inc
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Means for installing and removing flow valves or the like
US 2679903 A
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Descripción  (El texto procesado por OCR puede contener errores)

J1me 1954 H. E. MCGOWEN, JR., ET AL 2,679,903

MEANS FOR INSTALLING AND REMOVING FLOW VALVES OR THE LIKE 2 Sheets-Sheet 1 Filed NOV. 25, 1949 H. E.MG.GOWEN,JR. H. H. MOORE JR.

3m entors Gttorneg J1me 1954 H. E. MCGOWEN, JR ET AL 2,679,903

MEANS FOR INSTALLING AND REMOVING FLOW VALVES OR THE LIKE 2. Sheets-Sheet 2 iled Nov. 23, 1949 H. E. MQGOWEN,JR. H. H. MOORE, JR.

3nventors attorney Patented June 1, 1954 MEANS FOR INSTALLING AND REMOVING FLOW VALVES OR THE LIKE Harold E. McGowen, Jr., Jr., Bunkie, La., assign son Inc., Fort Worth,

Texas and Howard H. Moore, ors to Sid W. Richard- Tex., a corporation of Application November 23, 1949, Serial No. 129,001

9 Claims.

This invention relates to means for installing and removing flow control devices such as flow valves, chokes, and the like in the tubing of oil wells. The invention particularly has to do with the installation and removal of valves and the like which may be generically referred to as flow control units or devices and which are attached to the tubing wall outwardly of the axial center of the string of tubing. The invention has been found to be particularly useful in wells having two or more such valves installed in the wall of the tubing at different elevations. This application is a continuation in part of our copending application, Serial No. 34,954, filed June 24, 1948, now Patent No. 2,664,162.

An object of the invention is to provide a means for the installation and. removal of flow control devices such as flow valves, plugs having orifices therethrough, and the like for providing passage of oil orgas through the tubing of a well at different elevations in a manner whereby the removal of the tubing from the well is unnecessary, and thereby effecting a substantial saving in labor costs.

Another object of the invention is to provide a means for installing flow control devices such as flow valves, chokes, and the like in well tubing and for removing such fiow control devices therefrom by providing a shifting tool for carrying out the foregoing object, which shifting tool is also capable of detachable engagement with said valves or the like for carrying out the installing and removing operations.

Another object of the invention is to provide a special tubing length constructed in such a manner that there will be substantially no pressure differential on the ends of the installed valve or the like for expediting the removal thereof.

These and other objects of the invention will become apparent from the following description and the accompanying drawings, wherein:

Figure 1 is a vertical sectional view of a well casing within an earth formation and showing units comprising the present invention installed at different elevations in the string of tubing.

Figure 2 is an enlarged elevation of one of the units illustrated in Figure l.

Figure 3 is a vertical sectional view of the special section illustrated in Figure 2, and showing the invention arranged for bypassing the gas inlets.

Figure 4 is a view similar to Figure 3, but showing the invention just prior to the installation of a valve in the gas inlet of the special section of tubing.

Figure 5 is a vertical sectional view of the shifting mechanism of the preferred form of the invention.

Figure 6 is an elevation and broken section of a modified form of shifting tool.

Figure 7 is an elevation of a jar which may be employed in connection with the invention.

Figure 8 is an elevation of a flow valve and hold down assembly.

Figure 9 is a broken sectional view of the gas inlet of the special section and showing the valve hold down assembly in operating position.

Figure 10 is a broken elevation showing the engagement between a fishing tool and the upper end of the hold down assembly as employed when removing the valve.

Figure 11 is a vertical sectional view of the hold down assembly and running tool as employed when installing the valve, and

Figure 12 is a horizontal sectional view taken on lines 52-!2 of Figure 11, and showing the location of a shear pin for engaging the running tool with the hold down assembly.

A typical installation of the present invention is shown in Figure 1 wherein the well casing 2t receives a string of tubing 2| connected by collars 22. At intervals and at different elevations there are special sections of tubing 23 for accommodating gas lift valves 24 or the like in such a manner that the inlet ports 25 of the valves are exposed to the interior of the casing 26. The gas lift valves 24 are commercial items and can be bought on the open market are not herein described in detail. It is also to be understood that a valve housing without an internal mechanism but having a small port, such as the inlet 25, can operate as a choke, and yet come within the scope of the present invention.

Enlarged tubing section As shown, each tubing section 23 has an enlarged intermediate portion of greater internal cross sectional area than the internal cross sectional area at the ends of such section. An external recess is formed in a portion of each tubing section 23 intermediate its ends and aligned longitudinally extending openings are formed in the upper and lower walls of the external recesses providing seats for the reception of gas lift valves. There is thus formed within the overall dimensions of the enlarged intermediate portion of the tubing section what may be termed a laterally offset elongated internal tubular portion having upper and lower portions provided with aligned openings 2'! and 28 which form seats for the flow control unit, which internal tubular portion is open to the exterior of the well tubing intermedi ate the flow control unit seats. To this end the special tubing section 23 includes a vertical enlarged portion or shell 26 which is inte ral with and extends downwardly along the side of said special section where said shell terminates, and where the same is provided with an opening 25 offset or eccentric to the main passageway through the string of tubing H for receiving the upper end of the valve 24. The lower end of the valve 24 is similarly received within another ofiset or eccentric opening 28 formed in the upper end of a lower projection or shell 29 beneath the first described shell 25. Ring seals 33 (Figs. 8 and 9) are provided around the upper and lower ends of the valve 24 so as to seal the respective ends of said valve within the openings 21 and 28 (see Fig. 9). The lower end of the valve 24 is provided with a conical guide 3! which, as will become apparent, is employed for guiding the valve through a hold down or guide ring 32 (Figs. 3 and 4) above the opening 21 and integral with the inner surface or the upper shell 25. Valve outlets 33 are located in the valve 25 below the lower ring seals 30 (Fig. 8).

Hold-down assembly There is a hold-down assembly 34, as shown in detail in Fig. 11, adapted to be threadedly connected with the upper end of the valve M, which assembly includes a tubular body or connecting member 35 having a vertically disposed rod 3% slidably mounted in its upper end. A shouldered conical projection 31 adapted to be engaged by a suitable fishing tool when the valve is to be removed is secured to the upper end of the rod 35 and is positioned above the upper end of the body 35. The lower end of the rod 36 is provided with an enlarged cylindrical catch member 33 having a step 39 formed in one-half of its lower surface. The vertical side or shoulder 56 of the step 39 provides an abutment extending across the center of the assembly and is arranged for engaging a side or shoulder portion of a recess 4! in a latch 42 carried by the body member 35. As shown, the latch is rotatably mounted on a pin 43 horizontally positioned through opposing walls of the tubular body 35. The latch 22 includes a finger 44 which projects outwardly through one of a pair of opposing vertical slots 45 in the body 35. The upper end or head of the body 35 is downwardly and outwardly tapered, as at 46 to provide a cam surface to facilitate engagement with a suitable running tool. An annular recess l'i is provided beneath the tapered head portion of the body 35. A conventional running tool 48 coacts with the tapered upper end or head of the body 35 when installing a valve 24, and is temporarily secured or connected to the body 35 by means of a shear pin 49 extending through the running tool 48 and through one side of an annular recess 4'! formed beneath the head 46 of the body 35. The ends of the shear pin 49 may be held in place by means of set screws t (Fig. 12) at each end thereof and threadedly engaged in the body 35, as shown in Fig. 12. The latch finger M is normally urged downwardly through one of the slots 45 in the tubular body 35 by a wire spring 5i attached to the latch 42, coiled about the pin c3, and having its remaining end positioned against the inner wall of the body 35. As will become apparent in the description of the operation, the engagement between the vertical side 40 of the step 39 with the side of the recess 4| in the latch 12 serves to hold the valve 24 within the openings 27 and 28 by reason of the engagement of the finger 44 against the lower edge of the hold-down ring 32 (Fig. 9). A second shear pin 52 of greater strength than the pin E9 is positioned through the body 35 and through the slidable rod 38 for maintaining the cylindrical catch member 38 in engagement with the latch 42. As will become apparent in the description of operation, upwar movement of the rod 36 while the tubular member 35 is held fixed by the latch member 52 will shear the pin 52, and by reason of the action of the spring 5! the vertical side 20 of the cylindrical member 38 will disengage the side of the recess ll, and allow the finger G4 to be depressed through the vertical slot 45, thus disengaging the latch 42 from the ring 32. The shear pin 52 may be maintained against longitudinal displacement oy set screws 53 at each end thereof threadedly engaged in the body 35.

Shifting tool A shifting tool 54 (Figs. 3, 4 and 5) is adapted to be connected with the upper end of the running tool 48. The shifting tool is comprised of a rod 55 having a tubular mandrel or sleeve 56 slidably mounted thereon, together with centralizing elbows 5'! mounted on said mandrel. As shown in detail in Fig. 5, the mandrel 56 has an enlarged upper end 58 in which there are vertical slots 59 pivotally receiving the upper arms 69 or". the elbows 5?. A sleeve or collar 6i is slidably mounted on the mandrel 56 beneath the enlarged portion 58, which collar pivotally supports other arms 62 which are pivotally connected at their outer ends with the first described arms til. A iixed latching collar 63 is secured to the lower end of the mandrel 56 and which collar slidably receives the rod 55. A compression spring 54 is positioned around the mandrel 5% and between the slidable upper collar 6i and the lower collar 63 whereby the elbows 5? are normally urged outwardly. The elbows are laterally disposed with respect to the length of the rod 55, and thus when the shifting tool 5% passes through the main portion of the well tubing 2! of uniform diameter, the elbows 5T tend to centralize the assembly. A substantially cylindrical coupling 65 is connected with the lower end of the rod 55 and pivotally supports an upwardly extending latch 66 which is adapted to engage an annular recess 6'! near the lower end of the latching collar 63. After engagement the latch s5 is maintained in the recess 63 by means of a small compression spring 68 between the lower end of the said latch and the surface of the recess 69 in which the latch 66 is received.

A modified form of shifting tool is illustrated in Figure 6 and is generally designated by the nu meral '10. This form of the invention includes the previously described rod 55 upon which a pair of collars H are slidably mounted. Vertically disposed and outwardly bowed springs 72 are connected at corresponding ends with the slidable collars ll. The lower end of the rod 55 is provided with an annular shoulder 13 and the upper end of said rod is provided with a shouldered coupling 74 for maintaining the collars "H on the rod. There is a latch T5 pivotally mounted in a vertical slot '16 near the lower end of the rod 55 and arranged to engage the upper end of the lower collar H when the latter engages the lower shoulder I3. A spring 11 normally maintains the lower end of the latch tion.

The upper end of the rod 55 of the shifting tool assembly 54 or it is connected with a swivel assembly "58 (Fig. 7), which in turn is connected with a jar F9. The swivel i8 and the jar 79 are of conventional construction and well known to the art, and are not, therefore, described in detail. The upper end or" the jar T9 is connected with the lower end of a cable (not shown) which extends to the earths surface, and by which the thus far described assembly is raised and lowered through the tubing 2!.

Operation To install a flow valve 2 3, the same is threadedly connected with the lower end of the hold down assembly 3 3 which in turn is releasably con- 15 in an outward posinected with the running tool E8 in the manner previously described. The running tool 68 is threadedly connected with the latch supporting collar 65 at the lower end of the shifting tool d. The entire assembly, including the swivel 18 and the jar i9, is then lowered from the earths surface downwardly through the lengths of tubing 2!. By reason of the slidable engagement of the mandrel or sleeve 56 on the rod 55, the shiting tool 54 is initially maintained at the upper end of said rod 55 by reason of the frictional engagement of the elbows 51' on the inner wall of the tubing 2!. The distance from the lower end of the valve 2d to the elbows 57, when the shifting tool 54 is in its raised position on the rod 55, is such that the guide 3| on the lower end of the valve 24 will remain in axial alignment with the tubing 2i, and thereby initially bypass the holddown ring 32 in the shell 26. The last referred to arrangement and operation is illustrated in Fig. 3. Thus, the valve 24 may be lowered past any desired number of upper special sections 23 to any lower special section for either installing or removing the valve. To install the valve 24 in any desired special section 23, the assembly is first lowered therethrough, after which the cable is raised causing the rod 55 having at its lower end the latching collar 65 to move upwardly through the sleeve portion of the shifting tool 54 until the valve guide 3! is in a position above the holddown ring 32. At this time the latch 66 carried by the collar 55 at the lower end of the rod 55 engages the latching collar 63 at the lower end of the sleeve or mandrel 56. The assembly is then lowered until the elbows 57 enter the enlarged portion 26 of the special section 23. By reason of the action of the elbows 51, which are relieved against lateral pressure at one side thereof by the cavity of the shell 26, the valve 24 is moved laterally over the hold-down ring 32. The assembly is then further lowered and jarred, thereby engaging the ring seals 30 in the respective annular openings 27 and 28 in the enlarged special section of tubing 23. In this position the valve inlet 25 is in communication with the interior of the casing 20 and the valve outlets 33 communicate with the interior of the tubing 2!. The latch finger 44, through the action of the spring 51, is projected outwardly through slot Q5 and engages the lower edge of the hold-down ring 32. The cable is then jarred and pulled upwardly, thus shearing the pin 19 in the running tool 48, permitting the running tool, together with the assemblies thereabove to be raised to the earths surface, leaving the valve 24 seated and ready for operation.

To subsequently remove the valve 24 a conventional fishing tool (Fig. 10) having a length approximately equal the length of the valve 2d and the hold-down assembly 34, is then connected to the lower end of the shifting tool 54 and lowcred through the tubing H. The valve 2 3 to be removed is initially bypassed, and the cable is then drawn upwardly, thus causing the latch 66 carried by the collar 55 at the lower end of the shaft 55 to engage the latching collar 63 of the shifting tool 54. While in this position the spring pressed elbows 5? shift the assembly in the manner described above, and the fishing tool to is again lowered to engage the under portion of the conical projection 3'! at the upper end of the hold-down assembly. By raising the cable and operating the jar 18, the pin 52 which connects slidable rod 36 to the body member 35 is sheared, and by reason of the resulting upward movement of the rod 36 in the body member 35 of the holddown 34, the latch 42 is released from th catch member 38 and the finger M is retracted through the vertical slot 45 by the action of the spring 5|. The entire assembly is then drawn to the earths surface. It will be noted that the interior of the enlarged special section 23 communicates with both ends of the valve 24 so as to equalize the pressures on each end of the same, whereby the removal of the latter is facilitated since there is no material pressure differential to overcome.

The shifting tool illustrated in Fig. 6 operates in substantially the same manner as the shifting tool illustrated in Fig. 5. When the springs i2 enter the asymmetrical enlargement of the shell 26 the pressure on the radially arranged springs 12 becomes unequal and the rod 55 is shifted in the direction of the cavity. The other operations are the same as described in the foregoing, with the exceptions that the latch E5 passes through and engages the upper end of the lower collar ii so as to relatively shorten the length of the assembly for shifting the valve 2 3 to a position above the hold down ring 32. As will be apparent an internally threaded coupler or the like (not shown) would be required to connect the threaded lower end of a shifting tool such as shown in Fig. 6 with the threaded upper end of a running tool such as indicated at 48 in Fig. 11.

The described form of the invention may be made in many ways within the scope of the appended claims.

What is claimed is:

1. Well tubing comprising a how control unit receiving section having an enlarged intermediate portion of greater internal cross sectional area than the internal cross sectional area of the ends thereof, a laterally ofiset internal elongated tubular portion formed in the enlarged intermediate portion having upper and lower portions provided with aligned openings forming seats for said unit.

2. Well tubing comprising a flow control unit receiving section having an enlarged intermediate portion of greater internal cross sectional area than the internal cross sectional area of the ends thereof, an external recess formed in the enlarged intermediate portion, said recess having upper and lower wall portions provided with aligned longitudinally extending openings to provide seats for a flow control unit.

3. Well tubing comprising a special flow control unit receiving section having an enlarged intermediate portion of greater internal cross sectional area than the internal cross sectional area of the ends thereof, a transverse wall portion at the lower end of the enlarged portion having an opening therethrough connecting the interior of the section with the exterior thereof and adapted to receive a flow control unit, and guide means for the flow control unit comprising an internal ring located within the enlarged interior of the special section having its opening in alignment with the opening in the transverse wall portion,

4. Well tubing comprising a special section having an enlarged intermediate ortion or greater internal cross sectional area than the internal cross sectional area of the ends thereof, an external recess formed in the enlarged intermediate portion, said recess having upper and lower wall portions provided with aligned longitudinally extending openings to provide seats for a flow control unit, and an internal ring within the enlarged portion having an opening above and in alignment with the aforesaid openings to provide means for guiding the flow control unit into said upper and lower wall openings.

5. For use with a well tubing having a laterally offset portion therein, a flow control unit handling tool comprising a main elongate body portion having spring-pressed outwardly expansible centralizing means slidably positioned thereon, and co-engageable latching means on the forward portion of the main body of the tool and on the centralizing means for latching the centralizing means at the forward end of the body, said centralizing means when latched serving to deflect the tool into the ofiset of the tubing.

6. For use in applying or removing flow control units to or from tubing equipped with one or more special flow control unit supporting sections each provided with a portion laterally offset from the vertical main bore of the well tubing; a flow control unit handling tool adapted to be lowered from the top of the well within the tubing to a selected special section, said flow control unit handling tool comprising an elongated body member having spring-pressed outwardly expansible guiding and control means slidable thereon, adapted to frictionally engage the inner wall of the well tubing during the lowering operation until a special selected section is reached, and latching means located on the body member at the lower or forward end of the valve handling tool adapted to engage and latch the lower portion of said slidable expansible guiding means at the forward end of the tool on raising the elongated body member relative to said guiding means when the tool is within the well tubing, said expansible guiding means, when latched, functioning to deflect the forward end of the tool into the offset portion of the special section to either seat the flow control unit or grasp a seated flow control unit in order to disconnect and retrieve the control unit.

'7. A flow control unit handling tool as set forth in claim 6 having a flow control unit hold down assembly connected at the lower end thereof, said hold down assembly having spring-pressed catch means engageable with a portion of the wall of the special section for holding the assembly and attached control unit in seated position.

8. A flow control unit handling tool as set forth in claim '2, wherein the hold down assembly and handling tool are connected through the medium of a shear pin.

9. A flow control unit handling tool as set forth in claim '7, wherein the spring pressed catch is retained in latching position by means of a shear pin.

References Cited in the file of this patent UNITED STATES PATENTS

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US1996922 *26 Dic 19309 Abr 1935J H Mcevoy & CompanyBottom well choke
US2230107 *23 Jun 193928 Ene 1941Guiberson CorpInsertable and removable flow valves
US2380669 *11 Mar 194331 Jul 1945Mowrey Lester DWell anchor
US2401119 *28 Oct 194228 May 1946Guiberson CorpWell tool
US2490350 *15 Dic 19436 Dic 1949Claude C TaylorMeans for centralizing casing and the like in a well
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US2790395 *9 Mar 195430 Abr 1957Us Industries IncWell flow control apparatus and system
US2824525 *26 Jul 195425 Feb 1958Sid W Richardson IncOffset mandrel for small diameter tubing
US2828698 *9 Abr 19571 Abr 1958Otis Eng CoGas lift valve assembly
US2846014 *23 Abr 19565 Ago 1958Sid W Richardson IncLanding nipple for well tubing
US2856008 *26 Jul 195414 Oct 1958Otis Eng CoRunning and retrieving tools
US2869645 *8 Dic 195420 Ene 1959Richfield Oil CorpApparatus for controlling the flow of fluids in a multi-strata well
US2869646 *18 Feb 195520 Ene 1959Richfield Oil CorpFlow control apparatus
US2895428 *21 May 195621 Jul 1959Regan Forge & Eng CoLowering pulling tool and shatterable guide nose combination
US2948341 *2 Jun 19589 Ago 1960Otis Eng CoOffset circulating nipple and tools
US2959227 *2 Jun 19588 Nov 1960Otis Eng CoMeans for installing and pulling well tools
US2970648 *2 Jul 19567 Feb 1961Sid W Richardson IncCrossover apparatus for oil and gas wells
US2973039 *2 Nov 195628 Feb 1961Richfield Oil CorpMultiple zone fluid circulating apparatus
US2988146 *2 Jun 195813 Jun 1961Otis Eng CoOffset mandrel and tools
US3040814 *8 Jul 195926 Jun 1962Camco IncWell tool apparatus
US3051242 *29 Jun 195628 Ago 1962Richfield Oil CorpMultiple zone control apparatus
US3063372 *1 Abr 196013 Nov 1962Jet Res Ct IncApparatus for perforating wells
US3066740 *3 Jul 19584 Dic 1962Otis Eng CoFlow control well tools
US3268006 *10 Sep 196223 Ago 1966Shell Oil CoMethod and apparatus for installing and retrieving well tools in well strings
US3334690 *1 Jun 19648 Ago 1967Udell IncMethod and apparatus for installing and removing gas lift valves in a well
US3561528 *31 Oct 19699 Feb 1971Harold Brown CoApparatus for simultaneously guiding at least two insertable mechanisms in a well tubing
US3561535 *31 Oct 19699 Feb 1971Harold Brown CoMethod for simultaneously guiding at least two insertable mechanisms in a well tubing
US3727683 *16 Dic 197117 Abr 1973Camco IncApparatus for installing or removing a flow control device from a well tubing
US3799259 *4 Abr 197226 Mar 1974Macco Oil Tool Co IncSide pocket kickover tool
US3867983 *4 Feb 197425 Feb 1975Neal William CKick-over tool
US4039026 *14 Jul 19762 Ago 1977Otis Engineering CorporationKickover tool
US4073341 *3 May 197614 Feb 1978Del Norte Technology, Inc.Acoustically controlled subsurface safety valve system
US4554972 *30 Abr 198426 Nov 1985Otis Engineering CorporationWell tool locking device
US4765403 *7 Dic 198423 Ago 1988Crawford Douglas WApparatus for placing and removing well flow control devices
US5137085 *15 Jun 199011 Ago 1992Ot's Engineering CorporationSide pocket mandrel
US5507348 *16 Nov 199416 Abr 1996Scientific Drilling InternationalApparatus for locking wire line instrument to drill collar
US5785125 *21 Oct 199628 Jul 1998Tiw CorporationMechanical thru-tubing centralizer
US6068015 *5 Feb 199930 May 2000Camco International Inc.Sidepocket mandrel with orienting feature
US628000020 Nov 199828 Ago 2001Joseph A. ZupanickMethod for production of gas from a coal seam using intersecting well bores
US635752319 Nov 199919 Mar 2002Cdx Gas, LlcDrainage pattern with intersecting wells drilled from surface
US64125563 Ago 20002 Jul 2002Cdx Gas, Inc.Cavity positioning tool and method
US642544830 Ene 200130 Jul 2002Cdx Gas, L.L.P.Method and system for accessing subterranean zones from a limited surface area
US643932020 Feb 200127 Ago 2002Cdx Gas, LlcWellbore pattern for uniform access to subterranean deposits
US645400024 Oct 200024 Sep 2002Cdx Gas, LlcCavity well positioning system and method
US647808520 Feb 200112 Nov 2002Cdx Gas, LlpSystem for accessing subterranean deposits from the surface
US656128820 Jun 200113 May 2003Cdx Gas, LlcMethod and system for accessing subterranean deposits from the surface
US657523515 Abr 200210 Jun 2003Cdx Gas, LlcSubterranean drainage pattern
US657525513 Ago 200110 Jun 2003Cdx Gas, LlcPantograph underreamer
US659192213 Ago 200115 Jul 2003Cdx Gas, LlcPantograph underreamer and method for forming a well bore cavity
US659530117 Ago 200122 Jul 2003Cdx Gas, LlcSingle-blade underreamer
US659530217 Ago 200122 Jul 2003Cdx Gas, LlcMulti-blade underreamer
US659868624 Ene 200129 Jul 2003Cdx Gas, LlcMethod and system for enhanced access to a subterranean zone
US660458015 Abr 200212 Ago 2003Cdx Gas, LlcMethod and system for accessing subterranean zones from a limited surface area
US664442213 Ago 200111 Nov 2003Cdx Gas, L.L.C.Pantograph underreamer
US666287030 Ene 200116 Dic 2003Cdx Gas, L.L.C.Method and system for accessing subterranean deposits from a limited surface area
US66689187 Jun 200230 Dic 2003Cdx Gas, L.L.C.Method and system for accessing subterranean deposit from the surface
US667932226 Sep 200220 Ene 2004Cdx Gas, LlcMethod and system for accessing subterranean deposits from the surface
US668185519 Oct 200127 Ene 2004Cdx Gas, L.L.C.Method and system for management of by-products from subterranean zones
US66883887 Jun 200210 Feb 2004Cdx Gas, LlcMethod for accessing subterranean deposits from the surface
US670876412 Jul 200223 Mar 2004Cdx Gas, L.L.C.Undulating well bore
US672245219 Feb 200220 Abr 2004Cdx Gas, LlcPantograph underreamer
US672592212 Jul 200227 Abr 2004Cdx Gas, LlcRamping well bores
US673279220 Feb 200111 May 2004Cdx Gas, LlcMulti-well structure for accessing subterranean deposits
US684850831 Dic 20031 Feb 2005Cdx Gas, LlcSlant entry well system and method
US685147917 Jul 20028 Feb 2005Cdx Gas, LlcCavity positioning tool and method
US694203011 Feb 200413 Sep 2005Cdx Gas, LlcThree-dimensional well system for accessing subterranean zones
US696221631 May 20028 Nov 2005Cdx Gas, LlcWedge activated underreamer
US696429820 Ene 200415 Nov 2005Cdx Gas, LlcMethod and system for accessing subterranean deposits from the surface
US69643088 Oct 200215 Nov 2005Cdx Gas, LlcMethod of drilling lateral wellbores from a slant well without utilizing a whipstock
US697653315 Ago 200320 Dic 2005Cdx Gas, LlcMethod and system for accessing subterranean deposits from the surface
US697654716 Jul 200220 Dic 2005Cdx Gas, LlcActuator underreamer
US6981512 *19 Ago 20033 Ene 2006Dana CorporationTubular flow conduit with in-line integrated check valve and method of making same
US69863882 Abr 200317 Ene 2006Cdx Gas, LlcMethod and system for accessing a subterranean zone from a limited surface area
US69885483 Oct 200224 Ene 2006Cdx Gas, LlcMethod and system for removing fluid from a subterranean zone using an enlarged cavity
US699104712 Jul 200231 Ene 2006Cdx Gas, LlcWellbore sealing system and method
US699104812 Jul 200231 Ene 2006Cdx Gas, LlcWellbore plug system and method
US70077587 Feb 20057 Mar 2006Cdx Gas, LlcCavity positioning tool and method
US702513712 Sep 200211 Abr 2006Cdx Gas, LlcThree-dimensional well system for accessing subterranean zones
US702515418 Dic 200211 Abr 2006Cdx Gas, LlcMethod and system for circulating fluid in a well system
US70365841 Jul 20022 May 2006Cdx Gas, L.L.C.Method and system for accessing a subterranean zone from a limited surface area
US704804930 Oct 200123 May 2006Cdx Gas, LlcSlant entry well system and method
US707359512 Sep 200211 Jul 2006Cdx Gas, LlcMethod and system for controlling pressure in a dual well system
US709000914 Feb 200515 Ago 2006Cdx Gas, LlcThree-dimensional well system for accessing subterranean zones
US710068717 Nov 20035 Sep 2006Cdx Gas, LlcMulti-purpose well bores and method for accessing a subterranean zone from the surface
US71344945 Jun 200314 Nov 2006Cdx Gas, LlcMethod and system for recirculating fluid in a well system
US716306326 Nov 200316 Ene 2007Cdx Gas, LlcMethod and system for extraction of resources from a subterranean well bore
US718215721 Dic 200427 Feb 2007Cdx Gas, LlcEnlarging well bores having tubing therein
US72073905 Feb 200424 Abr 2007Cdx Gas, LlcMethod and system for lining multilateral wells
US720739530 Ene 200424 Abr 2007Cdx Gas, LlcMethod and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement
US721364414 Oct 20038 May 2007Cdx Gas, LlcCavity positioning tool and method
US722267027 Feb 200429 May 2007Cdx Gas, LlcSystem and method for multiple wells from a common surface location
US726404821 Abr 20034 Sep 2007Cdx Gas, LlcSlot cavity
US729986422 Dic 200427 Nov 2007Cdx Gas, LlcAdjustable window liner
US735387721 Dic 20048 Abr 2008Cdx Gas, LlcAccessing subterranean resources by formation collapse
US73605958 May 200222 Abr 2008Cdx Gas, LlcMethod and system for underground treatment of materials
US737398422 Dic 200420 May 2008Cdx Gas, LlcLining well bore junctions
US741922314 Ene 20052 Sep 2008Cdx Gas, LlcSystem and method for enhancing permeability of a subterranean zone at a horizontal well bore
US743462027 Mar 200714 Oct 2008Cdx Gas, LlcCavity positioning tool and method
US757177131 May 200511 Ago 2009Cdx Gas, LlcCavity well system
US829197431 Oct 200723 Oct 2012Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US829735031 Oct 200730 Oct 2012Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface
US829737729 Jul 200330 Oct 2012Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US831696631 Oct 200727 Nov 2012Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US833324517 Sep 200218 Dic 2012Vitruvian Exploration, LlcAccelerated production of gas from a subterranean zone
US837139931 Oct 200712 Feb 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US837603921 Nov 200819 Feb 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US83760521 Nov 200119 Feb 2013Vitruvian Exploration, LlcMethod and system for surface production of gas from a subterranean zone
US843456822 Jul 20057 May 2013Vitruvian Exploration, LlcMethod and system for circulating fluid in a well system
US846478431 Oct 200718 Jun 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US846911931 Oct 200725 Jun 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US847981231 Oct 20079 Jul 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US850562031 Oct 200713 Ago 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface and tools therefor
US851137231 Oct 200720 Ago 2013Vitruvian Exploration, LlcMethod and system for accessing subterranean deposits from the surface
US881384012 Ago 201326 Ago 2014Efective Exploration, LLCMethod and system for accessing subterranean deposits from the surface and tools therefor
DE1018818B *15 Feb 19557 Nov 1957Sid W Richardson IncVentilhalterungsrohr fuer Bohrloecher
DE3305740A1 *17 Feb 19831 Sep 1983Otis Eng CoSeitentaschenspindel
EP0345830A2 *4 Dic 198513 Dic 1989CRAWFORD, Douglass W.Kickover tool apparatus
EP0351884A1 *4 Dic 198524 Ene 1990CRAWFORD, Douglass W.Flow control device and packing sub
WO1986003544A2 *4 Dic 198519 Jun 1986Douglass W CrawfordApparatus for placing and removing well flow control devices
Clasificaciones
Clasificación de EE.UU.417/109, 166/241.1, 166/214, 166/382, 166/301, 417/454, 166/117.5, 166/243, 417/313, 166/123
Clasificación internacionalE21B23/00, E21B23/03
Clasificación cooperativaE21B23/03
Clasificación europeaE21B23/03