Means Anchored Against Rotation In One Conduit Section For Relatively Rotating Another Section Patents (Class 166/117.7)
  • Patent number: 9127517
    Abstract: A drill pipe connector assembly capable of connecting drill pipe segments without rotation. The assembly includes the pin end of a first drill pipe stabbed within the connector end of a second drill pipe. A connector nut is threadedly connected or snap locked to the connector end of the second drill pipe. The connector nut includes a retaining shoulder cooperating with a beveled shoulder on the pin end of the first drill pipe to retain the first drill pipe. The assembly includes seals to provide pressure integrity and prevent leaking. Cooperating rotational torque transfer profiles in the first and second drill pipes enable operational rotation of the drill string.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: September 8, 2015
    Assignee: Expert E & P Consultants, L.L.C.
    Inventors: Kenneth Dupal, Gary Allen Snyder, II
  • Publication number: 20140367093
    Abstract: A down-hole tool for pressure testing production tubing within a borehole of a well returning the well to production, includes an anti-rotational device comprising a tubular housing having a first end, a second end, an outer surface, and at least one anti-rotational wing disposed on the outer surface of the tubular housing, radially extendable to engage a radial surface of the borehole to anchor the production tubing thereto; a valve for controlling the flow of down-hole fluids within the production tubing, the valve comprising a first valve member fixedly positioned within the tubular housing of the anti-rotational device and a second valve member positionable between a closed position and an open position; and a reactivation device comprising means for axially engaging an axial surface of the borehole, the reactivation device affixed to the first end of the tubular housing, wherein the production tubing may be pressure tested when the valve is in the closed position.
    Type: Application
    Filed: April 29, 2014
    Publication date: December 18, 2014
    Inventors: David A. Howell, John M. Lynk, Bill B. Blatnick
  • Publication number: 20140262342
    Abstract: Downhole tubing rotators and related methods are disclosed. A mandrel harnesses torque from a progressing cavity pump stator to which it is coupled. Operation of the pump rotor induces a torque on the pump stator, and that torque is harnessed by the mandrel. A rate of rotation of the mandrel due to the torque from the pump stator is controlled, and the rotation rate is hydraulically reduced in an embodiment. A rotation in a direction opposite to a direction of rotation of the mandrel due to the torque from the pump stator is applied to a production tubing string. The direction of rotation of the mandrel could be reduced and applied to the production tubing string by a planetary gear system, for example.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: PREMIUM ARTIFICIAL LIFT SYSTEMS LTD.
    Inventor: Marcel Obrejanu
  • Patent number: 8789580
    Abstract: Systems and methods for providing a casing exit include a casing section having a generally cylindrical outer sleeve including a proximal end and a distal end. The outer sleeve may define an outer window extending between the proximal end and the distal end. A generally cylindrical inner sleeve may be received within the outer sleeve and may define an inner window. The inner sleeve may be moveable between a first position in which the inner window is misaligned with the outer window and the inner sleeve substantially closes the outer window, and a second position in which the inner window is aligned with the outer window. A deflector tool may be configured to engage the inner sleeve and move the inner sleeve from the first position to the second position.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: July 29, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventors: William Wallace Dancer, Stacey Blaine Donovan
  • Publication number: 20140000864
    Abstract: A Y-tool for use in a wellbore includes: a stem having a bore formed therethrough, a port formed through a wall thereof, and a coupling formed at each end thereof; a branch fastened to the stem and having a passage formed therethrough in fluid communication with the stem port and a coupling formed at an end thereof; and a gasket sealing an interface of the stem port and branch passage.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 2, 2014
    Inventors: Robert P. FIELDER, III, Lance I. FIELDER
  • Publication number: 20130048315
    Abstract: Embodiments of the disclosure pertain to an anti-rotation assembly for a downhole tool, the anti-rotation assembly having an anti-rotation device; and a lock ring engaged with the anti-rotation device, wherein the anti-rotation device is selected from a group consisting of a spring, a mechanically spring-energized member, and composite tubular piece. Other embodiments pertain to a method of operating a downhole tool that includes an anti-rotation assembly.
    Type: Application
    Filed: August 22, 2012
    Publication date: February 28, 2013
    Inventor: Duke VanLue
  • Patent number: 8360172
    Abstract: An apparatus for drilling a wellbore may include a first section, a second section, and a third section, all of which are rotatably interconnected with pivot bearings and positioned along a drill string. The second section and the third section may be configured to form a controllable bend angle in the drill string. The first section, the second section, and the third section may be configured as sleeves that surround a portion of the drill string. One or more sections may include locking pads that selectively engage a wall of the wellbore. A hydraulic locking device for controlling a direction of rotation of the second section may include one or more brake elements and a reverse spinning sleeve. A first brake element may be used engage the reverse spinning sleeve and a second brake element may be used to engage a drive shaft.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: January 29, 2013
    Assignee: Baker Hughes Incorporated
    Inventor: Bernd Santelmann
  • Patent number: 8276660
    Abstract: A back-off tool for use in breaking a joint of a tubular disposed in a well. The tool is dual anchoring in nature such that breaking of the joint may be achieved with a degree of precision heretofore unavailable. Additionally, the dual anchoring nature of the tool at both sides of the joint allows for power requirements to be met through use of a dowhole power source incorporated into the tool. As a result, the use of heavier power carrying cables and equipment may be avoided as well as explosives or similarly hazardous and/or imprecise measures.
    Type: Grant
    Filed: June 18, 2009
    Date of Patent: October 2, 2012
    Assignee: Schlumberger Technology Corporation
    Inventor: Victor Matthew Bolze
  • Publication number: 20120211220
    Abstract: An electric submersible pump (ESP) torque absorbtion anchor system (TAS) and a method to assemble the same are disclosed. The TAS includes a collar having an uphole end coupled to a production string and a flange formed on an outer diameter of the collar. The TAS also includes a sleeve having a rim extending radially inward from an uphole end of the sleeve. The collar is positioned in a cavity of the sleeve so that oppositely facing shoulders of the collar and the sleeve contact and transfer axial loads between the sleeve and the collar. A spring is positioned in an annulus between the sleeve and the collar and mounts to the collar and the sleeve so that rotational loading of the sleeve relative to the collar transfers to the spring.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 23, 2012
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Abbas Ghazi-Moradi, Donn J. Brown, Robert C. de Long, John J. Mack
  • Publication number: 20110240313
    Abstract: Disclosed is a torque limiter having driver mandrel and driven axially aligned mandrels, a piston movable into and out of an engaged position wherein the driver and driven mandrels are coupled together to transmit torque there between. Hydraulically locking the movable piston in an engaged position. Disengaging the hydraulic lock when during rotation when a specified torque magnitude is exceeded to allow relative rotation between the mandrels. Resetting the torque limiter by hydraulically locking the piston in the engaging position when relative rotation ceases or is reduced.
    Type: Application
    Filed: March 18, 2011
    Publication date: October 6, 2011
    Inventors: Benton T. Knobloch, JR., Todd J. Roy, David J. Tilley
  • Patent number: 7980299
    Abstract: Method of treating, especially, horizontally deviated wellbores where various treating solutions such as, acids, slurries, proppants, fracturing fluids, flushing fluids, or sealants are transferred into an annulus formed by a casing in the well and a working string. The working string has a seal member providing a sliding seal with the casing, a perforated nipple above the seal, and a check valve above the perforated nipple for preventing back flow through the working string to the surface. The working string has a seal element at the wellhead to avoid treating solutions leaking from the annulus out the wellhead. Treating solution of the desired make-up is pumped into the annulus, through the perforated nipple, down the working string, along the horizontal deviated wellbore, then into the strata or formation through a dispersing tool for the particular treating solution.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: July 19, 2011
    Inventor: Matthew C. Manulik
  • Patent number: 7946348
    Abstract: A downhole rotation tool comprises a housing rotatable and axially slideable in relation to a gear shaft. The gear shaft is located interior of the housing. A tube gear is located intermediate the gear shaft and the housing. Helical threading on the gear shaft exterior interacts with helical threading interior of the tube gear to impart rotation of the tube gear upon linear movement of the gear shaft. A gear face at a lower end of the tube gear interacts with a corresponding gear face on the housing. Face gear teeth of the tube gear and the housing include axially-aligned engaging surfaces to rotate the housing in a preferred direction on downward stroke of the gear shaft and include inclined slip surfaces to allow relative rotation of the housing gear face and the tube gear face upon upward stroke of the gear shaft.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: May 24, 2011
    Inventor: Jerry L. Swinford
  • Publication number: 20100319929
    Abstract: A back-off tool for use in breaking a joint of a tubular disposed in a well. The tool is dual anchoring in nature such that breaking of the joint may be achieved with a degree of precision heretofore unavailable. Additionally, the dual anchoring nature of the tool at both sides of the joint allows for power requirements to be met through use of a dowhole power source incorporated into the tool. As a result, the use of heavier power carrying cables and equipment may be avoided as well as explosives or similarly hazardous and/or imprecise measures.
    Type: Application
    Filed: June 18, 2009
    Publication date: December 23, 2010
    Inventor: Victor Matthew Bolze
  • Patent number: 7748447
    Abstract: A torque anchor for use with progressive cavity pumps (PC Pumps) for preventing rotation of the PC Pumps and any related tool string within a well bore, possessing a connector constructed and adapted to connect a tube, which in a preferred embodiment is a diluent cable, between the two fixed slips. A method is also recited for running coiled tubing or a diluent cable downhole using the torque anchor.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: July 6, 2010
    Assignee: Tazco Holdings Inc.
    Inventor: Edward L. Moore
  • Patent number: 7681637
    Abstract: A guide shoe that utilizes an eccentric nose attached to a cylindrical body that has spiraled, ridged blades extending outward from the body. An orientation system is attached between the body and a hollow shaft. The orientation system is designed to allow free rotation of the body and nose about the shaft during the insertion of the tubing into the hole. It does this by providing clearance between a pawl and notches on the cylindrical body. Indexing of the eccentric nose is provided by a slight retraction of the tubing string in the well hole. Friction between the well hole and ridged blade causes the cylindrical body to rotate about the shaft and lock into an oriented position. The guide shoe is attached to the tubing string by a threaded female connection mating to the matching male connection on the tubing string.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: March 23, 2010
    Inventors: Bradley L Frazier, Ronald G Schlappy
  • Patent number: 7591314
    Abstract: Methods and devices for sensing operating conditions associated with downhole, non-drilling operations, including, fishing and retrieval operations as well as underreaming or casing cutting operations and the like. A condition sensing device is used to measure downhole operating parameters, including, for example, torque, tension, compression, direction of rotation and rate of rotation. The operating parameter information is then used to perform the downhole operation more effectively.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: September 22, 2009
    Assignee: Baker Hughes Incorporated
    Inventors: James A. Sonnier, Robbie B. Colbert, James W. Anderson, Gerald Heisig, Blake C. Pizzolato, Johnny C. Hicks
  • Patent number: 7441595
    Abstract: A method and apparatus for forming multiple lateral passages from a wellbore into a subsurface earth formation to facilitate enhancement of the production of oil, gas, heavy oil or minerals from the formation. A plurality of lateral passages are formed from a wellbore into a subsurface formation through the use of a single-run passage forming tool to minimize rig time and associated costs. A downhole indexing tool is positioned downhole and has indexing sections for positioning and indexing of a downhole well service tool and establishes precise radial orientation and location of the tool for its well servicing operation. Sequential unidirectional rotational indexing is accomplished by an indexing control stinger having a J-slot indexing system defining a circumferential slot section defining a desired number of indexing positions that are sequenced responsive to linear reciprocating movement of the indexing control stinger.
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: October 28, 2008
    Inventor: Henk H. Jelsma
  • Patent number: 7225870
    Abstract: Embodiments of the present invention relate to hydraulic tools which may be used to set a liner top packer and/or may be used to resist the lifting forces of cementing pack-offs. One embodiment of a tool string for use in wellbore operations comprises a hydraulic anchor assembly adapted to prevent axial movement of the tool string and a hydraulic packer actuator assembly adapted to set a packer.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: June 5, 2007
    Assignee: Weatherford/Lamb, Inc.
    Inventors: Gerald D. Pedersen, David E. Hirth
  • Patent number: 7121350
    Abstract: An anchor to inhibit rotation of a device relative to an oil well casing, comprising a tubular mandrel adapted for direct or indirect connection to the device; a rotatable cylindrical housing with a plurality of apertures and able to receive at least a portion of the mandrel concentrically therethrough; a plurality of spaced apart anchoring slips disposed between the housing and the mandrel in registry with respective ones of the apertures in the housing's outer surface; a rotation mechanism associated with the mandrel to engage and then move respective ones of the anchoring slips radially towards and then into temporarily anchoring contact with the casing; and one or more drag blocks disposed in the housing in registry with respective ones of the apertures in the housing's outer surface to extend radially outwardly therefrom, each of the drag blocks being normally biased into frictional contact with the casing.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: October 17, 2006
    Assignee: Sampwell Testing Services LTD C/O/B/A Progressive Technology
    Inventors: Colin A. Aldridge, Fritz Jagert
  • Patent number: 7036580
    Abstract: The present invention relates to downhole apparatus for limiting rotation of a rotor (4) relative to a stator (8) associated with said rotor (4). Apparatus according to the invention is provided with a locking member (12) movable from a first axial position to a second axial position by the application of a static fluid pressure to a differential area of said locking member (12). The apparatus is characterised by means for selectively applying static fluid pressure to said differential area of said locking member (12).
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: May 2, 2006
    Assignee: Smith International Inc.
    Inventors: Bruce McGarian, Ian A. Gillies
  • Patent number: 7000704
    Abstract: A method of installing an internal latch profile in an existing tubular string does not require the use of a packer. In a described embodiment, a method of latch installation includes the step of deforming an interior surface of the tubular string after the tubular string is positioned in a well. In another described embodiment, a method of latch installation includes the step of cutting into the interior surface of the tubular string.
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: February 21, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Ray C. Smith
  • Patent number: 6968904
    Abstract: A method and apparatus for advancing a rotating motorized downhole tool for operations in oil/gas wells. The apparatus is adapted for drilling and milling away of casing sections in the wells, as preparation for plugging the same. The apparatus includes a rotating tool and a driving motor indirectly suspended on coiled tubing. The apparatus also includes a carriage connected to the motor adapted to absorb torques that occur during use. The carriage is connected to the coiled tubing via a swivel coupling such that a tensile force on the coiled tubing provides an advancing force for the tool and motor.
    Type: Grant
    Filed: February 3, 2004
    Date of Patent: November 29, 2005
    Assignee: Bakke Technology AS
    Inventor: Stig Bakke
  • Patent number: 6915846
    Abstract: A production tubing joint is disclosed for a well comprising a barrel forming an upper tubing section and connected to the tubing hanger, a tubing connector within the barrel having a lower end connected to a lower tubing section of the production tubing string, a lower locking means having a first lower lock component secured to the barrel and a second lower lock component secured to the tubing connector and selectively engageable with the first lower lock component for suspending the tubing connector and the lower tubing section from the barrel, an adapter bar for connection to a rod string, and an upper locking means having a first upper lock component secured to the tubing connector and a second upper lock component secured to the adapter bar and selectively engageable with the first upper lock component.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: July 12, 2005
    Inventor: Kent J. Carriere
  • Patent number: 6907935
    Abstract: A method of installing an internal latch profile in an existing tubular string does not require the use of a packer. In a described embodiment, a method of latch installation includes the step of deforming an interior surface of the tubular string after the tubular string is positioned in a well. In another described embodiment, a method of latch installation includes the step of cutting into the interior surface of the tubular string.
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: June 21, 2005
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Ray C. Smith
  • Patent number: 6899174
    Abstract: An instrument insert for a tool of the type comprising an inner member extending within an outer member, the inner and outer members being capable of relative longitudinal movement. The insert includes a first insert portion comprising a first instrument component of an instrument, a second insert portion comprising a second instrument component of the instrument and a coupling mechanism for connecting the first and second insert portions and for maintaining the first and second insert portions in a fixed relative longitudinal position. Further, the first and second insert portions are each adapted to be connected with one of the inner and outer members and the insert is adapted for mounting within the tool at a radial position between the inner and outer members such that the insert is capable of longitudinal movement relative to at least one of the inner and outer members.
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: May 31, 2005
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Terrance Dean Maxwell, John Ransford Hardin, Jr.
  • Publication number: 20040238171
    Abstract: The present invention relates to methods and equipment for recovering use of a well-bore in circumstances where the well bore has become blocked by downhole equipment. The invention provides a method comprising the steps of separating, at a release joint, a portion of equipment from a jammed portion (6) of equipment; running the separated portion of equipment uphole out of the wellbore (100); running a deflector assembly (60) downhole into the wellbore (100); and deflecting a milling tool (64) from the wellbore into surrounding formation. The method is characterised by restricting relative movement between the deflector assembly (60) and the wellbore (100) by engaging, prior to deflecting the milling tool (64), the deflector assembly (60) with said jammed portion (6) of equipment.
    Type: Application
    Filed: April 6, 2004
    Publication date: December 2, 2004
    Inventors: Bruce McGarian, Ian Alexander Gillies, Brian Cruickshank
  • Patent number: 6808022
    Abstract: A method of installing an internal latch profile in an existing tubular string does not require the use of a packer. In a described embodiment, a method of latch installation includes the step of deforming an interior surface of the tubular string after the tubular string is positioned in a well. In another described embodiment, a method of latch installation includes the step of cutting into the interior surface of the tubular string.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: October 26, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Ray C. Smith
  • Publication number: 20040140102
    Abstract: A downhole well tool (1) for orientation of a work tool (16) comprises an anchor (6), an energy unit (2) and a controller (22). The downhole well tool (1) is equipped with an axial displacement part (10) and a rotational part (14), where at least one of the axial displacement part (10) and the rotational part (14) is controlled by a programmable controller (22) and designed to steer the work tool (16) along any path within a work area.
    Type: Application
    Filed: December 1, 2003
    Publication date: July 22, 2004
    Inventor: Stig Bakke
  • Publication number: 20040011520
    Abstract: The present invention relates to downhole apparatus for limiting rotation of a rotor (4) relative to a stator (8) associated with said rotor (4). Apparatus according to the invention is provided with a locking member (12) movable from a first axial position to a second axial position by the application of a static fluid pressure to a differential area of said locking member (12). The apparatus is characterised by means for selectively applying static fluid pressure to said differential area of said locking member (12).
    Type: Application
    Filed: May 16, 2003
    Publication date: January 22, 2004
    Inventors: Bruce McGarian, Ian Alexander Gillies
  • Patent number: 6516878
    Abstract: A downhole equipment for use in the gas and oil drilling industry includes a first elongate member arranged in telescopic relation with a second elongate member, the elongate members being moveable relative to one another between a retracted position in which at least one tooth provided on the first elongate member is engaged with at least one tooth provided on the second elongate member so as to prevent relative rotation therebetween, and an extended position in which the at least one tooth of the second elongate member so as to permit relative rotation between the elongate members and in which abutment surfaces of the elongate members are in mechanical communication with each other so as to prevent further extending telescopic movement, Thus, the apparatus may be located between a spear and rotary easing cutter for setting the spear and for holding a casing and cutting string in tension while the casing is severed.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: February 11, 2003
    Assignee: Smith International, Inc.
    Inventors: Bruce McGarian, Lawrence R. Barr
  • Patent number: 6513601
    Abstract: The invention relates to a method for setting a packer (7) in a well bore (1), wherein a production tubing (4) with a packer (7) is located in the well bore (1). Abrading means (11) of the packer (7) is radially expanded and rotated, for rounding the well bore wall (10), and packing means (9) are radially expanded against the rounded well bore wall (10). The invention also relates to a packer (7) to be included in a production tubing (4) in a well bore (1), comprising radially expandable and rotatable abrading means (11) for rounding the well bore wall (10), and radially expandable packing means (9), for sealing between the packer (7) and the rounded well bore wall (10).
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: February 4, 2003
    Assignee: Triangle Equipment AS
    Inventors: Bengt Gunnarsson, Per Olav Haughom, Knut Nesland, Jone Salte
  • Patent number: 6289986
    Abstract: A pump rod drive and torque release mechanism for use in association with a downhole pump positioned within a well. The pump rod drive and torque release mechanism comprises a central housing having a generally hollow interior, a drive shaft received within the central housing, a drive rod received within the central housing, and a torque transfer mechanism positioned within the central housing. The drive shaft may be operatively connected to a pump rod rotator to impart rotational movement to the drive shaft. The drive rod may be operatively connected to a downhole pump so as to enable transference of rotational energy from the drive rod to the downhole pump. The torque transfer mechanism has an engaged position wherein it operatively connects the drive shaft to the drive rod such that rotation of the drive shaft causes rotation of the drive rod. The torque transfer mechanism also has a disengaged position wherein it operatively disconnects the drive shaft from the drive rod.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: September 18, 2001
    Assignee: Torque Control Systems Ltd.
    Inventors: Andrew J. Wright, Michael Wawrzynowski
  • Patent number: 6257333
    Abstract: A system for separating gas from a wellbore fluid as it is produced to the surface. The system includes a progressing cavity pump, a submergible electric motor and a fluid intake. The submergible electric motor is connected to the progressing cavity pump to drive the pump and draw wellbore fluid through the fluid intake. The fluid intake includes a hollow interior defined by a thick-walled section. Additionally, the fluid intake includes a plurality of fluid passageways extending through the thick-walled section. The passageways are oriented to create a reversal in fluid flow, and thus a release of gas, as the fluid is draw into the fluid intake.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: July 10, 2001
    Assignee: Camco International, Inc.
    Inventors: Jay S. Mann, Peter H. G. Straub
  • Patent number: 6199635
    Abstract: This invention relates to a shifting apparatus and method for use with a tubular string set in a well for unlocking, selective orientation and relocking of sections of the tubular string below the shifting apparatus of this invention, while the tubular string sections above the shifting apparatus of this invention remain substantially unchanged in their orientation in the well including a lower tubular wall member connected to the tubular string above the shifting apparatus, an upper tubular wall member connected to the lower tubular wall member for controlled movement and orientation between the lower tubular wall member and the upper tubular wall member and connected to the tubular string below the shifting apparatus, and an internal tool located inside the upper and lower tubular wall members for releasablely and selectively locking into the upper and lower tubular wall members for holding the upper and lower tubular walls engaged until orientation of the tubular string below the shifting apparatus is desi
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: March 13, 2001
    Inventors: Charles G. Brunet, Michel J. Bouchard
  • Patent number: 6189610
    Abstract: An anti-rotation device prevents right-hand rotation of a tubing string within a stationary well casing. The device includes a tubular housing connected inline with the tubing string. A fixed jaw configured for gripping the well casing projects outwardly from the housing. A pair of collars free to rotate about the housing support two floating jaws, which are also configured for gripping the well casing. The floating jaws rotate about the housing between a free position in which the floating jaws are positioned adjacent the fixed jaw and the overall diameter of the device is less than the diameter of the well casing and an engaged position with the floating jaws and the fixed jaws situated on opposing sides of the housing and the overall diameter of the device is greater than the diameter of the well casing.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: February 20, 2001
    Inventors: G. Maurice LaClare, Michael H. Kobes