US3599712A - Hydraulic anchor device - Google Patents

Hydraulic anchor device Download PDF

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Publication number
US3599712A
US3599712A US862199A US3599712DA US3599712A US 3599712 A US3599712 A US 3599712A US 862199 A US862199 A US 862199A US 3599712D A US3599712D A US 3599712DA US 3599712 A US3599712 A US 3599712A
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Prior art keywords
slips
well bore
gripping member
tabs
tab portion
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Expired - Lifetime
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US862199A
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Charles W Magill
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Dresser Industries Inc
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Dresser Industries Inc
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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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion
    • E21B23/0411—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube
    • E21B23/04115—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube using radial pistons

Definitions

  • the arrangement is such that inadvertent expansion of the slips and, thus, dragging of the slips on the wall of the well bore in response to a differential pressure created by the movement of the tool through the well bore is prevented.
  • the slips are positively restrained until a pressure sufficient to deform the tabs is deliberately applied whereupon the slips are I moved into holding engagement.
  • This invention relates generally to hydraulic anchoring devices for use in well bores. More particularly, but not by way of limitation, this invention relates to an improved hydraulic anchoring device and an improved slip-retaining device used thereon.
  • I-Iydraulically actuated, piston-type slips have been used in hydraulic anchors and packers for many years, but considerable difficulty is often encountered in moving the anchors through well bores. Frequently, the slips are moved outwardly into dragging engagement with the well bore wall under the'influence of a pressure differential created as the tool is moved through the well bore. When the slips engage the wall under the influence of such pressure, the slips are most often destroyed or severely damaged as the tool is moved through the casing or the well bore.
  • This invention provides an improved retaining device for hydraulically actuated, piston-type slips that is economical to manufacture and is very simple to install and replace.
  • Another object of the invention is to provide an improved anchoring device incorporating a retaining member that positively retains the slips in their nonengaging or retracted position until a predetermined hydraulic force is exerted thereon.
  • the improved anchoring device of thisinvention includes: a body having a fluid passageway and a lateral opening in the body communicating with the passageway; a gripping member movable in the lateral opening in response to pressure in the body into gripping engagement with the well bore wall; and, a retainer member mounted on the body and having a deformable tab portion engaging the gripping member.
  • the retainer member prevents movement of the gripping member toward the well bore wall until the pressure in the body exerts a force on the gripping member sufficient to deform the tab portion.
  • FIG. 1 is a view, partly in elevation and partly in cross section, of an anchoring device constructed in accordance with the invention and located in a well casing.
  • FIG. 2 is a cross-sectional view of a portion of the anchor of FIG. 1, illustrating another operative position of the anchor slips.
  • FIG. 1 shown therein and generally designated by the reference character 10 is a hydraulic anchor assembly that is disposed in a well casing 12.
  • the anchor assembly 10 as shown is constructed to function in conjunction with a well packer.
  • the only portion of the well packer visible in FIG. 1 is the upper setting sleeve
  • the anchor assembly 10 includes a generally cylindrical body 16 having its upper end threadedly attached to a tubing string 18 that extends to the surface of the well.
  • a lower end 20 of the body 16 extends into the setting sleeve 14 of the well packer.
  • a fluid passageway 22 extends through the body 16 and is in communication with the hollow interior of the tubing string 18.
  • a plurality of laterally extending openings 24 extend inwardly from the exterior surface of the body 16. Each opening 24 is in communication with the passageway 22 through a pressure port 26 that extends from the passageway 22 into each opening 24.
  • a piston-type slip 28 is sealingly and slidingly located in each of the openings 24.
  • An O-ring seal 29 encircles each slip 28 and forms a fluidtight seal with the body 16 in the openings 24.
  • the slips 28 are provided with an exterior toothed surface 30 for grippingly engaging the casing 12 as will be described more fully hereinafter.
  • a slot 32 extends entirely across the toothed surface 30 of each slip 28. The slots 32 are sized to receive an elongated slip retainer member 34.
  • a centrally located recess 36 extends into each of the slips 28.
  • a compression-type spring 38 is disposed in each of the recesses 36. The springs 38 have one end in engagement with the slips 28 and their opposite end in engagement with the retainer members 34 so that the slips 28 are continually biased relatively toward the passageway 22, that is, toward a nonengaging or retracted position with respect to the casing 12.
  • the retaining members 34 are connected to the body 16 by a plurality of threaded screws 40.
  • Spaced, diagonally extending slits 42 have been formed in right sides of the retaining members 34 as viewed in FIG. 1.
  • Similar slits 44 have been formed in the opposite or left-hand side of the retaining members 34 as viewed in FIG. 1.
  • the members 34, on the outside of the slits 42, have been bent toward the slips 28 to form deformable tabs 48.
  • the innermost ends of the tabs 48 engage the slips 28 in the slots 32.
  • the material outside the slits 44 is bent toward the passageway 22 forming deformable tabs 50 that engage the slips 28 in the slots 32 at a point substantially diametrically opposed to the point of engagement between the tabs 48 and the slips 28.
  • the retaining member 34 is preferably constructed from a material having little or no resiliency so that the tabs 48 and 50 do not exert biasing forces on the slips 28. Instead, the tabs 48 and 50 positively retain the slips 28 in the position illustrated in FIG. 1 until sufficient force is exerted on the slips 28 to deform the tabs 48 nd 50 as will be described.
  • the hydraulic pressure in the passageway 22 is decreased to release the slips 28.
  • the decrease in pressure permits the compression-type springs 38 to drive the slips 28 inwardly, that is, toward the passageway 22, moving the slips 28 out of engagement with the casing 12.
  • the anchor assembly and tubing string 18 may then be moved to any desired position in the casing 12 and reset by simply applying hydraulic pressure in the passageway 22.
  • the retainer members 34 which are now deformed, can be removed very quickly by simply unscrewing the screws 40.
  • the anchor assembly 10 is reconditioned for use by replacing the retainer members 34 with new retainer members or simply deforming the tabs 48 an 50 until they are again in the condition described in connection with FIG. 1 and replacing the screws 40.
  • the retainer members 34 are capable of being manufactured easily and economically since all that is required is to form the holes for the screws 40, cut the slits 42 and 44 therein and deform the tabs 48 and 50. Since the tabs 48 and 50 are relatively large in size, corrosive environments encountered in well bores will have little or no effect on the deformation strength thereof unless the anchor assembly 10 remains in such environments for an extended period.
  • the anchor assembly 10 incorporating the improved -retaining members 34 avoids the previous difficulties encountered with devices of this type. Furthermore, it can be appreciated that retaining members, constructed in accordance with the invention, can be quickly, easily and economically manufactured and utilized in the field opera- -tions.
  • a body having a fluid passageway and a lateral opening in said body communicating with said passageway;
  • gripping member moveable in said lateral opening in response to pressure in said body into gripping engagement with the well bore wall
  • retainer member constructed from a substantially nonresilient material and mounted on said body and having a deformable tab portion engaging said gripping member, said retainer member preventing movement of said gripping member toward the well bore wall until the pressure exerts a force on said member sufficient to deform said tab portion.

Abstract

An anchoring device that is useful in well bores to retain tubing strings, packers or the like in a fixed position therein. The anchoring device includes several hydraulically actuated piston slips and is provided with a retaining member that includes one or more deformable tabs that engage the slips to prevent the slips from moving outwardly until the hydraulic force exceeds the deformation strength of the tabs. The arrangement is such that inadvertent expansion of the slips and, thus, dragging of the slips on the wall of the well bore in response to a differential pressure created by the movement of the tool through the well bore is prevented. The slips are positively restrained until a pressure sufficient to deform the tabs is deliberately applied whereupon the slips are moved into holding engagement.

Description

United States Patent [72] Inventor CharlesW.Magill [54] HYDRAULIC ANCHOR DEVICE 5 Claims, 2 Drawing Figs.
[52] U.S. Cl 166/212 [51] Int.Cl E2lb 23/04 [50] Field of Search 166/212, 206, 120
[56] References Cited UNITED STATES PATENTS 2,915,011 12/1959 Hamil 166/212X 3,283,824 11/1966 Hoffman et al.. 166/212 3,363,695 1/1968 Magill 166/212 X 3,428,123 2/1969 Davis 166/120 3,454,037 7/1969 Pitts ABSTRACT: An anchoring device that is useful in well bores to retain tubing strings, packers or the like in a fixed position therein. The anchoring device includes several hydraulically actuated piston slips and is provided with a retaining member that includes one or more deformable tabs that engage the slips to prevent the slips from moving outwardly until the hydraulic force exceeds the deformation strength of the tabs. The arrangement is such that inadvertent expansion of the slips and, thus, dragging of the slips on the wall of the well bore in response to a differential pressure created by the movement of the tool through the well bore is prevented. The slips are positively restrained until a pressure sufficient to deform the tabs is deliberately applied whereupon the slips are I moved into holding engagement.
PATENTEDAUGI mm 3599.712
INVENTOR CHARLES W. MAGILL ATTORNEY FIG.I
HYDRAULIC ANCHOR DEVICE BACKGROUND OF THE INVENTION 7 This invention relates generally to hydraulic anchoring devices for use in well bores. More particularly, but not by way of limitation, this invention relates to an improved hydraulic anchoring device and an improved slip-retaining device used thereon.
I-Iydraulically actuated, piston-type slipshave been used in hydraulic anchors and packers for many years, but considerable difficulty is often encountered in moving the anchors through well bores. Frequently, the slips are moved outwardly into dragging engagement with the well bore wall under the'influence of a pressure differential created as the tool is moved through the well bore. When the slips engage the wall under the influence of such pressure, the slips are most often destroyed or severely damaged as the tool is moved through the casing or the well bore.
Various structural'arrangements have been utilized in the past in an effort to overcome the inadvertent outward movement of such slips. For example, U.S. Pat. No. 3,131,769 issued to .I. F. De Rochemont on May 5, I964, illustrates various arrangements of shear members interconnecting the slips and the tool body that function to retain the slips in their nonengaging position until sufficient force is exerted thereon to part the shear members. The shear-type retaining devices have been reasonably successful, but they are relatively expensive in that they must be very accurately machined in an effort to reproduce the parting strength for each slip. Also, the anchoring devices used in well bores are subjected to, in many instances, extremely corrosive environments that attack the shear-type devices and drastically change their parting value.
This invention provides an improved retaining device for hydraulically actuated, piston-type slips that is economical to manufacture and is very simple to install and replace.
Another object of the invention is to provide an improved anchoring device incorporating a retaining member that positively retains the slips in their nonengaging or retracted position until a predetermined hydraulic force is exerted thereon.
SUMMARY OF THE INVENTION The improved anchoring device of thisinvention includes: a body having a fluid passageway and a lateral opening in the body communicating with the passageway; a gripping member movable in the lateral opening in response to pressure in the body into gripping engagement with the well bore wall; and, a retainer member mounted on the body and having a deformable tab portion engaging the gripping member. The retainer member prevents movement of the gripping member toward the well bore wall until the pressure in the body exerts a force on the gripping member sufficient to deform the tab portion.
The foregoing and additional objects and advantages of the invention will become more apparent as the following detailed description is read in conjunction with the accompanying drawings wherein like reference characters denote like parts in all views.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view, partly in elevation and partly in cross section, of an anchoring device constructed in accordance with the invention and located in a well casing.
FIG. 2 is a cross-sectional view of a portion of the anchor of FIG. 1, illustrating another operative position of the anchor slips.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawing and FIG. 1 in particular, shown therein and generally designated by the reference character 10 is a hydraulic anchor assembly that is disposed in a well casing 12. The anchor assembly 10 as shown is constructed to function in conjunction with a well packer. The only portion of the well packer visible in FIG. 1 is the upper setting sleeve The anchor assembly 10 includes a generally cylindrical body 16 having its upper end threadedly attached to a tubing string 18 that extends to the surface of the well. A lower end 20 of the body 16 extends into the setting sleeve 14 of the well packer. A fluid passageway 22 extends through the body 16 and is in communication with the hollow interior of the tubing string 18.
A plurality of laterally extending openings 24 extend inwardly from the exterior surface of the body 16. Each opening 24 is in communication with the passageway 22 through a pressure port 26 that extends from the passageway 22 into each opening 24.
A piston-type slip 28 is sealingly and slidingly located in each of the openings 24. An O-ring seal 29 encircles each slip 28 and forms a fluidtight seal with the body 16 in the openings 24. The slips 28 are provided with an exterior toothed surface 30 for grippingly engaging the casing 12 as will be described more fully hereinafter. A slot 32 extends entirely across the toothed surface 30 of each slip 28. The slots 32 are sized to receive an elongated slip retainer member 34.
A centrally located recess 36 extends into each of the slips 28. A compression-type spring 38 is disposed in each of the recesses 36. The springs 38 have one end in engagement with the slips 28 and their opposite end in engagement with the retainer members 34 so that the slips 28 are continually biased relatively toward the passageway 22, that is, toward a nonengaging or retracted position with respect to the casing 12.
The retaining members 34 are connected to the body 16 by a plurality of threaded screws 40. Spaced, diagonally extending slits 42 have been formed in right sides of the retaining members 34 as viewed in FIG. 1. Similar slits 44 have been formed in the opposite or left-hand side of the retaining members 34 as viewed in FIG. 1. The members 34, on the outside of the slits 42, have been bent toward the slips 28 to form deformable tabs 48. The innermost ends of the tabs 48 engage the slips 28 in the slots 32. The material outside the slits 44 is bent toward the passageway 22 forming deformable tabs 50 that engage the slips 28 in the slots 32 at a point substantially diametrically opposed to the point of engagement between the tabs 48 and the slips 28.
The retaining member 34 is preferably constructed from a material having little or no resiliency so that the tabs 48 and 50 do not exert biasing forces on the slips 28. Instead, the tabs 48 and 50 positively retain the slips 28 in the position illustrated in FIG. 1 until sufficient force is exerted on the slips 28 to deform the tabs 48 nd 50 as will be described.
OPERATION When it is desired to use the anchor assembly 10, it is assembled as illustratedin FIG. 1 and connected with the tubing string 18. The tabs 48 and 50 of the retainer members 34 engage and retain the slips 28 in the retractedp osition.
As previously mentioned, one of the difficulties encountered in utilizing hydraulically actuated slips of the type described is that a differential pressure created as the tool moves through the well bore acts upon the slips to move them outwardly into dragging engagement with the casing. It can be appreciated that the retaining member 34 positively retains the slips 28 in the retracted position and, thus, the slips can not be inadvertently moved out by a pressure as low as that which will be created by moving the tool through the well bore.
Upon reaching the desired location in the well bore or cars ing 12 for setting the slips 28, hydraulic pressure is applied in the passageway 22. The pressure acts through the ports 26 and in the openings 24 to drive the pistons 28 outwardly. When the pressure reaches a sufficient magnitude, the tabs 48 an 50 are deformed outwardly, as illustrated in FIG. 2, permitting the toothed outer surface 30 of the slips 28 to engage the casing 12. In this position, the anchor 10 securely retains the tubin 18 in a fixed position in the well bore.
Whendesired, the hydraulic pressure in the passageway 22 is decreased to release the slips 28. The decrease in pressure permits the compression-type springs 38 to drive the slips 28 inwardly, that is, toward the passageway 22, moving the slips 28 out of engagement with the casing 12. The anchor assembly and tubing string 18 may then be moved to any desired position in the casing 12 and reset by simply applying hydraulic pressure in the passageway 22.
After the anchor assembly 10 has been removed from the well bore, the retainer members 34, which are now deformed, can be removed very quickly by simply unscrewing the screws 40. The anchor assembly 10 is reconditioned for use by replacing the retainer members 34 with new retainer members or simply deforming the tabs 48 an 50 until they are again in the condition described in connection with FIG. 1 and replacing the screws 40.
The retainer members 34 are capable of being manufactured easily and economically since all that is required is to form the holes for the screws 40, cut the slits 42 and 44 therein and deform the tabs 48 and 50. Since the tabs 48 and 50 are relatively large in size, corrosive environments encountered in well bores will have little or no effect on the deformation strength thereof unless the anchor assembly 10 remains in such environments for an extended period.
From the foregoing detailed description, it can be appreciated that the anchor assembly 10 incorporating the improved -retaining members 34 avoids the previous difficulties encountered with devices of this type. Furthermore, it can be appreciated that retaining members, constructed in accordance with the invention, can be quickly, easily and economically manufactured and utilized in the field opera- -tions.
The embodiments of the invention in which I claim an exclusive property or privilege are defined as follows:
1. In apparatus to be lowered into a well bore:
a body having a fluid passageway and a lateral opening in said body communicating with said passageway;
gripping member moveable in said lateral opening in response to pressure in said body into gripping engagement with the well bore wall; and
retainer member constructed from a substantially nonresilient material and mounted on said body and having a deformable tab portion engaging said gripping member, said retainer member preventing movement of said gripping member toward the well bore wall until the pressure exerts a force on said member sufficient to deform said tab portion.
2. The apparatus of claim 1 wherein said retainer member extends completely across said lateral opening.
3. The apparatus of claim 2 wherein said gripping member has a slot therein adjacent to and sized to receive said retainer member.
4. The apparatus of claim 3 and also including resilient means engaging said retainer member and said gripping member for biasing said gripping member relatively toward said passageway.
5. The apparatus of claim 4 wherein said retainer member has a deformable second tab portion, said second tab portion engaging said gripping member at a location substantially diametrically opposed to the location of engagement between said first-mentioned tab portion and said gripping member

Claims (5)

1. In apparatus to be lowered into a well bore: a body having a fluid passageway and a lateral opening in said body communicating with said passageway; a gripping member moveable in said lateral opening in response to pressure in said body into gripping engagement with the well bore wall; and a retainer member constructed from a substantially nonresilient material and mounted on said body and having a deformable tab portion engaging said gripping member, said retainer member preventing movement of said gripping member toward the well bore wall until the pressure exerts a force on said member sufficient to deform said tab portion.
2. The apparatus of claim 1 wherein said retainer member extends completely across said lateral opening.
3. The apparatus of claim 2 wherein said gripping member has a slot therein adjacent to and sized to receive said retainer member.
4. The apparatus of claim 3 and also including resilient means engaging said retainer member and said gripping member for biasing said gripping member relatively toward said passageway.
5. The apparatus of claim 4 wherein said retainer member has a deformable second tab portion, said second tab portion engaging said gripping member at a location substantially diametrically opposed to the location of engagement between said first-mentioned tab portion and said gripping member.
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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030547A (en) * 1974-11-14 1977-06-21 Rose Shuffman, executrix Apparatus for cryothermal fracturing of rock formations
US4463814A (en) * 1982-11-26 1984-08-07 Advanced Drilling Corporation Down-hole drilling apparatus
DE3420788A1 (en) * 1983-06-08 1984-12-13 Institut gornogo dela Sibirskogo otdelenija Akademii Nauk SSSR, Novosibirsk REVERSIBLE DEVICE WITH IMPACT
US5070941A (en) * 1990-08-30 1991-12-10 Otis Engineering Corporation Downhole force generator
US6062309A (en) * 1997-07-11 2000-05-16 Variperm Limited Torque roller anchor
US6241031B1 (en) 1998-12-18 2001-06-05 Western Well Tool, Inc. Electro-hydraulically controlled tractor
US6347674B1 (en) 1998-12-18 2002-02-19 Western Well Tool, Inc. Electrically sequenced tractor
US6367366B1 (en) 1999-12-02 2002-04-09 Western Well Tool, Inc. Sensor assembly
US6431291B1 (en) 2001-06-14 2002-08-13 Western Well Tool, Inc. Packerfoot with bladder assembly having reduced likelihood of bladder delamination
US6464003B2 (en) 2000-05-18 2002-10-15 Western Well Tool, Inc. Gripper assembly for downhole tractors
US6679341B2 (en) 2000-12-01 2004-01-20 Western Well Tool, Inc. Tractor with improved valve system
US6715559B2 (en) 2001-12-03 2004-04-06 Western Well Tool, Inc. Gripper assembly for downhole tractors
US20040168828A1 (en) * 2003-02-10 2004-09-02 Mock Philip W. Tractor with improved valve system
US20050247488A1 (en) * 2004-03-17 2005-11-10 Mock Philip W Roller link toggle gripper and downhole tractor
US20080053663A1 (en) * 2006-08-24 2008-03-06 Western Well Tool, Inc. Downhole tool with turbine-powered motor
US20080217024A1 (en) * 2006-08-24 2008-09-11 Western Well Tool, Inc. Downhole tool with closed loop power systems
US7624808B2 (en) 2006-03-13 2009-12-01 Western Well Tool, Inc. Expandable ramp gripper
US7748476B2 (en) 2006-11-14 2010-07-06 Wwt International, Inc. Variable linkage assisted gripper
US20110000665A1 (en) * 2009-07-01 2011-01-06 Smith International, Inc. Hydraulically Locking Stabilizer
US8245796B2 (en) 2000-12-01 2012-08-21 Wwt International, Inc. Tractor with improved valve system
US8485278B2 (en) 2009-09-29 2013-07-16 Wwt International, Inc. Methods and apparatuses for inhibiting rotational misalignment of assemblies in expandable well tools
US20140174746A1 (en) * 2010-10-15 2014-06-26 Steelhaus Technologies, Inc. Sleeve valve
US9447648B2 (en) 2011-10-28 2016-09-20 Wwt North America Holdings, Inc High expansion or dual link gripper
US9488020B2 (en) 2014-01-27 2016-11-08 Wwt North America Holdings, Inc. Eccentric linkage gripper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915011A (en) * 1956-03-29 1959-12-01 Welex Inc Stabilizer for well casing perforator
US3283824A (en) * 1963-10-14 1966-11-08 Baker Oil Tools Inc Hydraulically set well anchors
US3363695A (en) * 1965-11-08 1968-01-16 Schlumberger Well Surv Corp Hydraulic anchor
US3428123A (en) * 1967-10-05 1969-02-18 Philip E Davis Jr Packer tool setting and hold-down arrangement
US3454087A (en) * 1967-11-15 1969-07-08 Dow Chemical Co Pressure balanced packer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915011A (en) * 1956-03-29 1959-12-01 Welex Inc Stabilizer for well casing perforator
US3283824A (en) * 1963-10-14 1966-11-08 Baker Oil Tools Inc Hydraulically set well anchors
US3363695A (en) * 1965-11-08 1968-01-16 Schlumberger Well Surv Corp Hydraulic anchor
US3428123A (en) * 1967-10-05 1969-02-18 Philip E Davis Jr Packer tool setting and hold-down arrangement
US3454087A (en) * 1967-11-15 1969-07-08 Dow Chemical Co Pressure balanced packer

Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030547A (en) * 1974-11-14 1977-06-21 Rose Shuffman, executrix Apparatus for cryothermal fracturing of rock formations
US4463814A (en) * 1982-11-26 1984-08-07 Advanced Drilling Corporation Down-hole drilling apparatus
DE3420788A1 (en) * 1983-06-08 1984-12-13 Institut gornogo dela Sibirskogo otdelenija Akademii Nauk SSSR, Novosibirsk REVERSIBLE DEVICE WITH IMPACT
US5070941A (en) * 1990-08-30 1991-12-10 Otis Engineering Corporation Downhole force generator
US6062309A (en) * 1997-07-11 2000-05-16 Variperm Limited Torque roller anchor
US20040245018A1 (en) * 1998-12-18 2004-12-09 Duane Bloom Electrically sequenced tractor
US7080701B2 (en) 1998-12-18 2006-07-25 Western Well Tool, Inc. Electrically sequenced tractor
US20060196694A1 (en) * 1998-12-18 2006-09-07 Duane Bloom Electrically sequenced tractor
US6427786B2 (en) 1998-12-18 2002-08-06 Western Well Tool, Inc. Electro-hydraulically controlled tractor
US7185716B2 (en) 1998-12-18 2007-03-06 Western Well Tool, Inc. Electrically sequenced tractor
US7174974B2 (en) 1998-12-18 2007-02-13 Western Well Tool, Inc. Electrically sequenced tractor
US6478097B2 (en) 1998-12-18 2002-11-12 Western Well Tool, Inc. Electrically sequenced tractor
US6938708B2 (en) 1998-12-18 2005-09-06 Western Well Tool, Inc. Electrically sequenced tractor
US20060196696A1 (en) * 1998-12-18 2006-09-07 Duane Bloom Electrically sequenced tractor
US6241031B1 (en) 1998-12-18 2001-06-05 Western Well Tool, Inc. Electro-hydraulically controlled tractor
US6745854B2 (en) 1998-12-18 2004-06-08 Western Well Tool, Inc. Electrically sequenced tractor
US6347674B1 (en) 1998-12-18 2002-02-19 Western Well Tool, Inc. Electrically sequenced tractor
US20050252686A1 (en) * 1998-12-18 2005-11-17 Duane Bloom Electrically sequenced tractor
US6367366B1 (en) 1999-12-02 2002-04-09 Western Well Tool, Inc. Sensor assembly
US7191829B2 (en) * 2000-02-16 2007-03-20 Western Well Tool, Inc. Gripper assembly for downhole tools
US20050082055A1 (en) * 2000-02-16 2005-04-21 Duane Bloom Gripper assembly for downhole tools
US20060201716A1 (en) * 2000-02-16 2006-09-14 Duane Bloom Gripper assembly for downhole tools
US7275593B2 (en) 2000-02-16 2007-10-02 Western Well Tool, Inc. Gripper assembly for downhole tools
US7048047B2 (en) 2000-02-16 2006-05-23 Western Well Tool, Inc. Gripper assembly for downhole tools
US20070017670A1 (en) * 2000-02-16 2007-01-25 Duane Bloom Gripper assembly for downhole tools
US6640894B2 (en) 2000-02-16 2003-11-04 Western Well Tool, Inc. Gripper assembly for downhole tools
US8555963B2 (en) 2000-05-18 2013-10-15 Wwt International, Inc. Gripper assembly for downhole tools
US20080078559A1 (en) * 2000-05-18 2008-04-03 Western Well Tool, Inc. Griper assembly for downhole tools
US7604060B2 (en) 2000-05-18 2009-10-20 Western Well Tool, Inc. Gripper assembly for downhole tools
US8069917B2 (en) 2000-05-18 2011-12-06 Wwt International, Inc. Gripper assembly for downhole tools
US8944161B2 (en) 2000-05-18 2015-02-03 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US9228403B1 (en) 2000-05-18 2016-01-05 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US6464003B2 (en) 2000-05-18 2002-10-15 Western Well Tool, Inc. Gripper assembly for downhole tractors
US9988868B2 (en) 2000-05-18 2018-06-05 Wwt North America Holdings, Inc. Gripper assembly for downhole tools
US20070151764A1 (en) * 2000-12-01 2007-07-05 Duane Bloom Tractor with improved valve system
US6679341B2 (en) 2000-12-01 2004-01-20 Western Well Tool, Inc. Tractor with improved valve system
US7607495B2 (en) 2000-12-01 2009-10-27 Western Well Tool, Inc. Tractor with improved valve system
US20070000693A1 (en) * 2000-12-01 2007-01-04 Duane Bloom Tractor with improved valve system
US8245796B2 (en) 2000-12-01 2012-08-21 Wwt International, Inc. Tractor with improved valve system
US20040144548A1 (en) * 2000-12-01 2004-07-29 Duane Bloom Tractor with improved valve system
US20080217059A1 (en) * 2000-12-01 2008-09-11 Duane Bloom Tractor with improved valve system
US7080700B2 (en) 2000-12-01 2006-07-25 Western Well Tool, Inc. Tractor with improved valve system
US7353886B2 (en) 2000-12-01 2008-04-08 Western Well Tool, Inc. Tractor with improved valve system
US7188681B2 (en) 2000-12-01 2007-03-13 Western Well Tool, Inc. Tractor with improved valve system
US6431291B1 (en) 2001-06-14 2002-08-13 Western Well Tool, Inc. Packerfoot with bladder assembly having reduced likelihood of bladder delamination
US6715559B2 (en) 2001-12-03 2004-04-06 Western Well Tool, Inc. Gripper assembly for downhole tractors
US7343982B2 (en) 2003-02-10 2008-03-18 Western Well Tool, Inc. Tractor with improved valve system
US7121364B2 (en) 2003-02-10 2006-10-17 Western Well Tool, Inc. Tractor with improved valve system
US20080223616A1 (en) * 2003-02-10 2008-09-18 Western Well Tool, Inc. Tractor with improved valve system
US7493967B2 (en) 2003-02-10 2009-02-24 Western Well Tool, Inc. Tractor with improved valve system
US20040168828A1 (en) * 2003-02-10 2004-09-02 Mock Philip W. Tractor with improved valve system
US20070107943A1 (en) * 2003-02-10 2007-05-17 Mock Philip W Tractor with improved valve system
US20050247488A1 (en) * 2004-03-17 2005-11-10 Mock Philip W Roller link toggle gripper and downhole tractor
US7954563B2 (en) 2004-03-17 2011-06-07 Wwt International, Inc. Roller link toggle gripper and downhole tractor
US7607497B2 (en) 2004-03-17 2009-10-27 Western Well Tool, Inc. Roller link toggle gripper and downhole tractor
US20090008152A1 (en) * 2004-03-17 2009-01-08 Mock Philip W Roller link toggle gripper and downhole tractor
US7392859B2 (en) 2004-03-17 2008-07-01 Western Well Tool, Inc. Roller link toggle gripper and downhole tractor
US20100018720A1 (en) * 2006-03-13 2010-01-28 Western Well Tool, Inc. Expandable ramp gripper
US7624808B2 (en) 2006-03-13 2009-12-01 Western Well Tool, Inc. Expandable ramp gripper
US7954562B2 (en) 2006-03-13 2011-06-07 Wwt International, Inc. Expandable ramp gripper
US8302679B2 (en) 2006-03-13 2012-11-06 Wwt International, Inc. Expandable ramp gripper
US20080217024A1 (en) * 2006-08-24 2008-09-11 Western Well Tool, Inc. Downhole tool with closed loop power systems
US20080053663A1 (en) * 2006-08-24 2008-03-06 Western Well Tool, Inc. Downhole tool with turbine-powered motor
US7748476B2 (en) 2006-11-14 2010-07-06 Wwt International, Inc. Variable linkage assisted gripper
US8061447B2 (en) 2006-11-14 2011-11-22 Wwt International, Inc. Variable linkage assisted gripper
US20110000665A1 (en) * 2009-07-01 2011-01-06 Smith International, Inc. Hydraulically Locking Stabilizer
US8082987B2 (en) 2009-07-01 2011-12-27 Smith International, Inc. Hydraulically locking stabilizer
US8485278B2 (en) 2009-09-29 2013-07-16 Wwt International, Inc. Methods and apparatuses for inhibiting rotational misalignment of assemblies in expandable well tools
US20140174746A1 (en) * 2010-10-15 2014-06-26 Steelhaus Technologies, Inc. Sleeve valve
US9638003B2 (en) * 2010-10-15 2017-05-02 Schlumberger Technology Corporation Sleeve valve
US9447648B2 (en) 2011-10-28 2016-09-20 Wwt North America Holdings, Inc High expansion or dual link gripper
US9488020B2 (en) 2014-01-27 2016-11-08 Wwt North America Holdings, Inc. Eccentric linkage gripper
US10156107B2 (en) 2014-01-27 2018-12-18 Wwt North America Holdings, Inc. Eccentric linkage gripper
US10934793B2 (en) 2014-01-27 2021-03-02 Wwt North America Holdings, Inc. Eccentric linkage gripper
US11608699B2 (en) 2014-01-27 2023-03-21 Wwt North America Holdings, Inc. Eccentric linkage gripper

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