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WO1996018799A1 - Procede et appareil destine a l'assemblage et au desassemblage de tubages - Google Patents

Procede et appareil destine a l'assemblage et au desassemblage de tubages Download PDF

Info

Publication number
WO1996018799A1
WO1996018799A1 PCT/GB1995/002953 GB9502953W WO9618799A1 WO 1996018799 A1 WO1996018799 A1 WO 1996018799A1 GB 9502953 W GB9502953 W GB 9502953W WO 9618799 A1 WO9618799 A1 WO 9618799A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
drive shaft
top drive
head
main elevator
Prior art date
Application number
PCT/GB1995/002953
Other languages
English (en)
Inventor
Arnold Stokka
Phillip Brian LUCAS
Original Assignee
Weatherford/ Lamb, Inc.
Lucas, Brian, Ronald
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weatherford/ Lamb, Inc., Lucas, Brian, Ronald filed Critical Weatherford/ Lamb, Inc.
Priority to AU42667/96A priority Critical patent/AU4266796A/en
Publication of WO1996018799A1 publication Critical patent/WO1996018799A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B3/00—Rotary drilling
    • E21B3/02—Surface drives for rotary drilling
    • E21B3/022—Top drives

Definitions

  • This invention relates to a method and apparatus for connecting and disconnecting tubulars.
  • a hole is bored into the earth.
  • Lengths of casing are then screwed together to form stands and lowered into the bore, inter alia to prevent the wall of the bore collap ⁇ sing and to carry oil or gas to the surface.
  • slips are applied which support the casing whilst the next stand of casing is screwed into the casing in the slips.
  • the slips are released and the new stand lowered into the bore. This process is repeated until the desired length of casing has been lowered into the bore.
  • Top drives are generally hydraulically or electrically operated.
  • a method for connecting tubulars comprises the step of rotating one tubular relative to another with a top drive.
  • an apparatus for use in a method in accordance with the present invention which appara ⁇ tus comprises a head for gripping a length of casing and a drive shaft which extends from said head and is rotat- able by a top drive.
  • said drive shaft is telescopically extendible.
  • said drive shaft is hollow and includes an upper section and a lower section and where ⁇ in said apparatus further includes a packer actuable when said drive shaft is fully contracted to provide a seal between said upper section and said lower section.
  • a chamber is provided which can be pressurized to contract said drive shaft.
  • said head comprises a plurality of jaws and a plurality of actuators for urging said jaws into engagement with said casing.
  • the apparatus includes a support block for supporting a main elevator.
  • the apparatus includes a pair of bails and a main elevator wherein said bails are mounted on opposite sides of said support block and said main elevator is connected to said bails.
  • a joint may be provided to enable the head to be pivoted to facilitate handling the stands of casing.
  • a universal joint is preferred although this is not essential.
  • the present invention also provides a top drive provided with an apparatus in accordance with the pre ⁇ sent invention. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  • Fig 1 is a perspective view of one embodiment of a drilling rig provided with a top drive and an apparatus in accordance with the present invention
  • Fig 2 is a view of a detail of a second embodiment
  • Fig 3 is a side view of a third embodiment of part of a drilling rig provided with a top drive and an apparatus in accordance with the invention.
  • the drilling rig 1 comprises a top drive 2 which is supported by a travelling block 3.
  • the top drive 2 is mounted on a carriage 4 which is slidably mounted on rails 5.
  • a telescopic drive shaft 6 is connected to the bottom of the top drive 2 and comprises an upper section 7 and a lower section 8 which are provided with interen- gaging internal and external splines respectively.
  • the telescopic drive shaft 6 extends through a bore in a support block 9 which is suspended from the top drive 2 by a hollow tubular member 20.
  • Two bails 10 are disposed to opposite sides of the support block 9 and support main elevator 11.
  • the lower section 8 of the telescopic drive shaft 6 is connected to a head 12 which comprises six gripping jaws (not shown) which are actuable by respective hy ⁇ draulic rams 13.
  • ancil- lary handling equipment such as an auxiliary elevator or a pipe handling device and gripped by main elevator 11.
  • the stand of casing is then lowered into the bore by lowering the top drive 2.
  • slips 14 are applied to prevent the casing 15 falling down the bore.
  • Main elevator 11 is then disconnected and raised to the top of the drilling rig 1.
  • a new stand of casing 16 is then moved into axial alignment with the casing 15 by the pipe handling de- vice.
  • Top drive 2 is then lowered until the head 12 surrounds the socket on the top of the stand of casing 16.
  • the top drive 2 is then lowered a further few cm (typically 10 to 20 cms) during which time the lower section 8 of the telescopic drive shaft 6 enters the upper section 7.
  • the hydraulic rams 13 are then applied to urge a plurality of jaws (not shown) into engagement with the head 12.
  • the main elevator 11 is placed around the casing 11 but is NOT moved into gripping engagement with the casing 16 at this stage.
  • the pipe positioning device is then lowered to allow the bottom end of the stand of casing 16 to enter the socket 17 on the top of the casing 15.
  • Top drive 2 is then actuated to rotate the tele ⁇ scopic drive shaft 6, the head 12 and the casing 16.
  • the lower section 8 slides downwardly relative to the upper section 7 and relative to the main elevator 11 which does not rotate with the telescopic drive shaft 6.
  • the pipe handling device may be released or lowered in a controlled manner to inhibit damage to the threads.
  • vertical movement of the pipe handling device may be controlled by a pneumatic cylinder which simply compresses as the casing 16 enters the socket 17.
  • top drive 2 is electric the torque applied to the joint can be limited by limiting the maximum current to the top drive 2.
  • the torque applied to the joint can be limited by limiting the maximum pressure of the hydrau ⁇ lic fluid.
  • the top drive 2 is then lowered until the casing 16 occupies the position initially occupied by the casing 15 at which time the process is repeated.
  • the telescopic drive shaft 6' comprises an upper section 7' and a lower section 8' which are biased together by compressed air introduced into chamber 18 via hose 19.
  • the chamber 18 Prior to lowering the head 12 onto a new stand of casing the chamber 18 is pressurised with compressed air to fully contract the telescopic drive shaft 6. The top drive 2 is then lowered until the head 12 is circumja ⁇ cent the casing 15. The hydraulic rams 13 are then actuated.
  • the casing 16 When the top drive 2 is rotated the casing 16 enters the socket 17 and the pressure in the chamber 18 increases as the casing 16 moves downwardly.
  • the pneu ⁇ matic cushion provided by the compressed air in chamber 18 allows the joint to be made with minimal risk of damage to the threads.
  • top drive 2" is suspended from travelling block 3".
  • Support block 9" is bolted directly to the housing of top drive 2" and is provided with ears for accommodating bails (not shown).
  • a drive shaft extends downwardly from the top drive 2" to universal joint 21" which in turn supports tele ⁇ scopic drive shaft 6" which comprises an upper section 7" provided with external splines and a lower section 8" which is provided with internal splines and which is fast with head 12".
  • the universal join 21" allows the head 12" to be pivoted to facilitate the connection of stands of cas ⁇ ing.
  • a further refinement of this embodiment is that, above the external splines the upper section 7" is provided with an inflatable packer 22".
  • the drive shaft 6" is hollow.
  • the main elevator is then relaxed and travelling block 3" lowered.
  • the head 12" engages the top of the casing and the upper section 7" of the drive shaft 6" enters the lower section 8" until the inflat ⁇ able packer 22" lies inside the lower section 8".
  • the inflatable packer is then inflated. Mud is then pumped down the well via a hose 23, the drive shaft of the top drive 2" (which is hollow), a flexible hose (not visible) extending across the univer ⁇ sal joint 21", and through the hollow drive shaft 6".
  • a resilient annular sealing member 23" is also provided to form a seal between the head 12" and the top of the socket on the casing.
  • the purpose of pumping mud down the hole is to try and free any blockage. After pumping has been continued for a given period, for example 10 minutes, the flow of mud is stopped.
  • the travelling block 3" is then raised until the main elevator is just below the socket.
  • the main elevator is then applied to the casing and is then raised to enable the stops to be released.
  • the travel ⁇ ling block 3" is then lowered. If the blockage has not been cleared the slips are re-applied and the procedure repeated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

On utilise une tige d'entraînement supérieure (2) pour assembler deux longueurs de tubage (15, 16). Selon un mode de réalisation préféré, la tige d'entraînement supérieure (2) est reliée à un arbre de commande télescopique (6) qui possède une tête (12) qui peut être fixée sur le tubage (16). On peut commander le couple de torsion appliqué au raccordement au moyen d'une régulation de la pression hydraulique ou du courant appliqué à la tige d'entraînement supérieure (2). Le harnais principal (11) est maintenu par une paire d'anses (10) qui sont suspendues à un bloc de support (9) attaché à la partie supérieure de l'arbre de commande télescopique (6).
PCT/GB1995/002953 1994-12-17 1995-12-18 Procede et appareil destine a l'assemblage et au desassemblage de tubages WO1996018799A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42667/96A AU4266796A (en) 1994-12-17 1995-12-18 Method and apparatus for connecting and disconnecting tubulars

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9425499.2 1994-12-17
GBGB9425499.2A GB9425499D0 (en) 1994-12-17 1994-12-17 Method and apparatus for connecting and disconnecting tubulars

Publications (1)

Publication Number Publication Date
WO1996018799A1 true WO1996018799A1 (fr) 1996-06-20

Family

ID=10766102

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002953 WO1996018799A1 (fr) 1994-12-17 1995-12-18 Procede et appareil destine a l'assemblage et au desassemblage de tubages

Country Status (3)

Country Link
AU (1) AU4266796A (fr)
GB (1) GB9425499D0 (fr)
WO (1) WO1996018799A1 (fr)

Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005844A1 (fr) * 1996-07-31 1998-02-12 Weatherford/Lamb, Inc. Mecanisme de vissage/devissage d'elements de tubage
WO2000005483A1 (fr) * 1998-07-22 2000-02-03 Weatherford/Lamb, Inc. Raccordement d'elements tubulaire a manoeuvre par le dessus
WO2000052297A3 (fr) * 1999-03-05 2000-12-21 Varco Int Instrument d'assemblage de tuyaux
WO2002092959A1 (fr) * 2001-05-17 2002-11-21 Weatherford/Lamb, Inc. Appareil et procedes de verrouillage destines a la formation de tubes
US6527047B1 (en) 1998-08-24 2003-03-04 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US6527493B1 (en) 1997-12-05 2003-03-04 Varco I/P, Inc. Handling of tube sections in a rig for subsoil drilling
US6536520B1 (en) 2000-04-17 2003-03-25 Weatherford/Lamb, Inc. Top drive casing system
US6622796B1 (en) 1998-12-24 2003-09-23 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US6637526B2 (en) 1999-03-05 2003-10-28 Varco I/P, Inc. Offset elevator for a pipe running tool and a method of using a pipe running tool
US6691801B2 (en) 1999-03-05 2004-02-17 Varco I/P, Inc. Load compensator for a pipe running tool
US6705405B1 (en) 1998-08-24 2004-03-16 Weatherford/Lamb, Inc. Apparatus and method for connecting tubulars using a top drive
US6725938B1 (en) 1998-12-24 2004-04-27 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US6742584B1 (en) 1998-09-25 2004-06-01 Tesco Corporation Apparatus for facilitating the connection of tubulars using a top drive
EP1475512A1 (fr) * 1999-03-05 2004-11-10 Varco I/P, Inc. Instrument d'assemblage de tuyaux
US6976298B1 (en) 1998-08-24 2005-12-20 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US6994176B2 (en) 2002-07-29 2006-02-07 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US7004264B2 (en) 2002-03-16 2006-02-28 Weatherford/Lamb, Inc. Bore lining and drilling
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US7040420B2 (en) 1994-10-14 2006-05-09 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7083005B2 (en) 2002-12-13 2006-08-01 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US7090023B2 (en) 2002-10-11 2006-08-15 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US7093675B2 (en) 2000-08-01 2006-08-22 Weatherford/Lamb, Inc. Drilling method
US7096982B2 (en) 2003-02-27 2006-08-29 Weatherford/Lamb, Inc. Drill shoe
US7100713B2 (en) 2000-04-28 2006-09-05 Weatherford/Lamb, Inc. Expandable apparatus for drift and reaming borehole
US7100710B2 (en) 1994-10-14 2006-09-05 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100697B2 (en) 2002-09-05 2006-09-05 Weatherford/Lamb, Inc. Method and apparatus for reforming tubular connections
US7107875B2 (en) 2000-03-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars while drilling
US7108084B2 (en) 1994-10-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7117957B2 (en) 1998-12-22 2006-10-10 Weatherford/Lamb, Inc. Methods for drilling and lining a wellbore
US7128154B2 (en) 2003-01-30 2006-10-31 Weatherford/Lamb, Inc. Single-direction cementing plug
US7131505B2 (en) 2002-12-30 2006-11-07 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US7140445B2 (en) 1997-09-02 2006-11-28 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US7165634B2 (en) 1994-10-14 2007-01-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7188687B2 (en) 1998-12-22 2007-03-13 Weatherford/Lamb, Inc. Downhole filter
US7191840B2 (en) 2003-03-05 2007-03-20 Weatherford/Lamb, Inc. Casing running and drilling system
US7216727B2 (en) 1999-12-22 2007-05-15 Weatherford/Lamb, Inc. Drilling bit for drilling while running casing
US7264067B2 (en) 2003-10-03 2007-09-04 Weatherford/Lamb, Inc. Method of drilling and completing multiple wellbores inside a single caisson
US7284617B2 (en) 2004-05-20 2007-10-23 Weatherford/Lamb, Inc. Casing running head
US7303022B2 (en) 2002-10-11 2007-12-04 Weatherford/Lamb, Inc. Wired casing
US7311148B2 (en) 1999-02-25 2007-12-25 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7325610B2 (en) 2000-04-17 2008-02-05 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US7334650B2 (en) 2000-04-13 2008-02-26 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US7360594B2 (en) 2003-03-05 2008-04-22 Weatherford/Lamb, Inc. Drilling with casing latch
US7370707B2 (en) 2003-04-04 2008-05-13 Weatherford/Lamb, Inc. Method and apparatus for handling wellbore tubulars
US7413020B2 (en) 2003-03-05 2008-08-19 Weatherford/Lamb, Inc. Full bore lined wellbores
US7503397B2 (en) 2004-07-30 2009-03-17 Weatherford/Lamb, Inc. Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US7510006B2 (en) 1999-03-05 2009-03-31 Varco I/P, Inc. Pipe running tool having a cement path
US7591304B2 (en) 1999-03-05 2009-09-22 Varco I/P, Inc. Pipe running tool having wireless telemetry
US7635026B2 (en) 1996-10-04 2009-12-22 Frank's International, Inc. Methods and devices for forming a wellbore with casing
US7699121B2 (en) 1999-03-05 2010-04-20 Varco I/P, Inc. Pipe running tool having a primary load path
US7753138B2 (en) 1999-03-05 2010-07-13 Varco I/P, Inc. Pipe running tool having internal gripper
US7770654B2 (en) 2003-11-10 2010-08-10 Tesco Corporation Pipe handling device, method and system
US7866390B2 (en) 1996-10-04 2011-01-11 Frank's International, Inc. Casing make-up and running tool adapted for fluid and cement control
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US8136603B2 (en) 2009-09-01 2012-03-20 Tesco Corporation Method of preventing dropped casing string with axial load sensor
US8191621B2 (en) 2009-05-29 2012-06-05 Tesco Corporation Casing stabbing guide and method of use thereof
US8240371B2 (en) 2009-06-15 2012-08-14 Tesco Corporation Multi-function sub for use with casing running string
US8567512B2 (en) 2003-03-05 2013-10-29 Weatherford/Lamb, Inc. Apparatus for gripping a tubular on a drilling rig

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US5036927A (en) * 1989-03-10 1991-08-06 W-N Apache Corporation Apparatus for gripping a down hole tubular for rotation

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Cited By (90)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7108084B2 (en) 1994-10-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7165634B2 (en) 1994-10-14 2007-01-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7040420B2 (en) 1994-10-14 2006-05-09 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100710B2 (en) 1994-10-14 2006-09-05 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US5839330A (en) * 1996-07-31 1998-11-24 Weatherford/Lamb, Inc. Mechanism for connecting and disconnecting tubulars
AU715011B2 (en) * 1996-07-31 2000-01-13 Weatherford Technology Holdings, Llc Mechanism for connecting and disconnecting tubulars
WO1998005844A1 (fr) * 1996-07-31 1998-02-12 Weatherford/Lamb, Inc. Mecanisme de vissage/devissage d'elements de tubage
US8082982B2 (en) 1996-10-04 2011-12-27 Frank's International, Inc. Methods and devices for forming a wellbore with casing
US7874361B2 (en) 1996-10-04 2011-01-25 Frank's International, Inc. Methods and devices for forming a wellbore with casing
US7866390B2 (en) 1996-10-04 2011-01-11 Frank's International, Inc. Casing make-up and running tool adapted for fluid and cement control
US7635026B2 (en) 1996-10-04 2009-12-22 Frank's International, Inc. Methods and devices for forming a wellbore with casing
US7140445B2 (en) 1997-09-02 2006-11-28 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US6527493B1 (en) 1997-12-05 2003-03-04 Varco I/P, Inc. Handling of tube sections in a rig for subsoil drilling
US7137454B2 (en) 1998-07-22 2006-11-21 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
AU770288B2 (en) * 1998-07-22 2004-02-19 Weatherford Technology Holdings, Llc Connection of tubulars using a top drive
WO2000005483A1 (fr) * 1998-07-22 2000-02-03 Weatherford/Lamb, Inc. Raccordement d'elements tubulaire a manoeuvre par le dessus
US7451826B2 (en) 1998-08-24 2008-11-18 Weatherford/Lamb, Inc. Apparatus for connecting tubulars using a top drive
US7513300B2 (en) 1998-08-24 2009-04-07 Weatherford/Lamb, Inc. Casing running and drilling system
US6688398B2 (en) 1998-08-24 2004-02-10 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US6976298B1 (en) 1998-08-24 2005-12-20 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US7617866B2 (en) 1998-08-24 2009-11-17 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US6705405B1 (en) 1998-08-24 2004-03-16 Weatherford/Lamb, Inc. Apparatus and method for connecting tubulars using a top drive
US7353880B2 (en) 1998-08-24 2008-04-08 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US7021374B2 (en) 1998-08-24 2006-04-04 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
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