EP0171144B1 - Dispositif pour manipuler des tubages de puits - Google Patents

Dispositif pour manipuler des tubages de puits Download PDF

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Publication number
EP0171144B1
EP0171144B1 EP85304072A EP85304072A EP0171144B1 EP 0171144 B1 EP0171144 B1 EP 0171144B1 EP 85304072 A EP85304072 A EP 85304072A EP 85304072 A EP85304072 A EP 85304072A EP 0171144 B1 EP0171144 B1 EP 0171144B1
Authority
EP
European Patent Office
Prior art keywords
drill string
tubular drill
threaded tubular
members
compressed gas
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP85304072A
Other languages
German (de)
English (en)
Other versions
EP0171144A1 (fr
Inventor
William Doyle Stringfellow
Melvin Carter Hawke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weatherford Lamb Inc
Original Assignee
Weatherford Holding US Inc
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 Holding US Inc filed Critical Weatherford Holding US Inc
Publication of EP0171144A1 publication Critical patent/EP0171144A1/fr
Application granted granted Critical
Publication of EP0171144B1 publication Critical patent/EP0171144B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • E21B19/06—Elevators, i.e. rod- or tube-gripping devices
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
    • E21B19/15—Racking of rods in horizontal position; Handling between horizontal and vertical position
    • E21B19/155—Handling between horizontal and vertical position
    • 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
    • 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

Definitions

  • the invention relates to a method and device for connecting threaded tubular drill string members, for example casing members.
  • one or more casing strings are set to protect the well bore and/or the formation. Whether the crew members are running surface, intermediate, or production casing, the handling of these heavy individual casing members presents special problems.
  • US-A-3 351 372 or US-A-1 454 194 discloses a device for facilitating the handling of a load, which device comprises:
  • US-A-1 842 638 discloses a device which is generally similar to that disclosed in US-A-1 454 194.
  • a first member and a second member are maintained apart by a spring and by hydraulic fluid.
  • the first member is attached to the lifting wire of a crane and the load is attached to the second member.
  • the load is positioned above its desired resting place using the lifting wire.
  • the hydraulic fluid is then drained from between the first and second members to lower the load into its resting place. It will be noted that the load cannot be moved downwardly by hand pressure since hydraulic fluid is incompressible.
  • the present invention is directed to a method and device for connecting casings and other tubular drill string members to reduce the above problems.
  • Preferred embodiments provide an elevator-like device which provides the rig hands greater control over the vertical movement of casing to be attached to assembled casing strings.
  • a method for connecting threaded tubular drill string members for example casing members, which method comprises the steps of:
  • a device for use in carrying out a method according to the invention which device comprises:
  • said resilient means comprise, directly or indirectly, compressed gas.
  • one of said first and second members has an end wall and a side wall having at least two elongate slots therein disposed to opposite sides of said one member, and wherein the other member is provided with a bar which extends through said slots and the ends of which provide attachment points for connecting said other member to said lifting block.
  • said first member comprises an enclosure having a top wall, a bottom wall and a side wall extending therebetween
  • said second member comprises a top wall mounted in said first member and provided with lifting straps which extend through the bottom wall of said first member, and wherein said resilient means acts between the bottom wall of said first member and the top wall of said second member.
  • a device includes a stop arranged to limit the minimum distance between said first and second members.
  • the resilient means may be associated with hydraulic and/or mechanical features.
  • the resilient means could comprise a spring which would preferably be adjustable. Whilst this would be quite acceptable for substantially uniform loads it is not particularly favoured where the load is not constant.
  • the resilient means could act between the first member and the second member via hydraulic fluid, for example a hydraulic piston and cylinder assembly could be disposed between the first and second members and associated with a control mechanism adapted-to admit or vent hydraulic fluid from the assembly to raise or lower the load with respect to the first member.
  • a hydraulic accumulator or the like is provided to introduce resilience into the system.
  • the compressed gas is contained in a piston and cylinder arrangement or in a bellows disposed between the first member and the second member.
  • means are preferably provided to adjust the gas pressure in the piston and cylinder or bellows either by the admission of gas thereto or by the venting of gas therefrom.
  • the gas pressure may be set so that the load is exactly supported by the bellows or the piston and cylinder in an expanded state. Downward pressure on the load will result in the bellows or piston and cylinder contracting and the load moving downwards. This can, of course, greatly facilitate the connection of a new casing to an assembled pipe string since the weight of the new casing is counterbalanced by the gas pressure.
  • a pressure relief valve may be provided which may be set to vent either at the maximum design pressure of the equipment or, at a given pressure corresponding to the load being balanced. This would normally be the case where successive loads are substantially equal.
  • means may be provided to automatically adjust the pressure in the piston and cylinder or bellows to maintain the first and second members spaced apart by a given distance when the load is first lifted. Once the load is near its final position the automatic means are rendered inoperative to enable the load to be lowered by the application of downward pressure.
  • a joint elevator is connected to the second member.
  • the present invention also provides a drilling rig provided with a device in accordance with the invention.
  • said resilient force which maintains said first and second members apart is applied, at least in part, directly or indirectly, by gas pressure.
  • the rig When casing is being "run", or connected in an assembled string and lowered into a hole that has already been drilled, the rig is typically configured to handle the very heavy weight of the assembled casing string 21 by suspending the travelling block 10 from the crown block (not shown) using multiple wraps of the drilling line 11 around the sheaves of the travelling block 10. On heavy strings, a large number of wraps, up to sixteen or more, may be required. From bails 12a and 12b on the travelling block is suspended an elevator 13, normally a slip elevator, sized to hoist and lower the entire weight of the assembled casing string, which weight may exceed 2,000,000 pounds (900 tonnes).
  • the single joint elevator 15 is typically required to hoist and lower only approximately 100 to 20,000 pounds weight (45 to 9090 kg).
  • That portion of the assembled casing string 21 which has already been assembled and lowered into the hole is suspended in a spider 16 mounted on the rig floor 17.
  • the slips of the spider 16 grasp the uppermost member of the assembled casing string 21 below its box 22 (or female threaded end), leaving the box 22 exposed for connection with the pin 33 (or male threaded end) of the next casing 20 to be added to the assembled casing string.
  • the single joint elevator 15 is displaced to the area of the next casing 20 to be added and attached thereto just below its box 24.
  • the driller draws up some of the drilling line 11 so as to hoist into the mast the single joint elevator 15 and casing 20. Hoisting continues until the casing 20 is positioned vertically above the spider 16 and the exposed box 22, as depicted in Figure 3.
  • This process requires the driller to then lower the casing length 20 so that the "sfabber" can stab the pin 23 into the box 22 and rotate it to "make-up" the connection. Rotation and make-up is typically accomplished via use of power tongs 18, shown in Figure 4.
  • the single joint elevator 15 is disengaged on the casing 20.
  • the slips of the spider 16 are released, and the assembled casing string 21 is lowered into the well bore the length of the casing 20. At this point, the spider slips 16 are reset and the entire process is repeated until all of the casing lengths have been made-up.
  • the device comprises a lower housing member 30 and an upper housing member 31.
  • the upper housing member 31 has an end well 31a a and a substantially vertical and cylindrical side wall 31 b extending therebelow.
  • the side wall 31 b is provided with one or more elongate slots 31 c.
  • the lower housing member 30 comprises bars 30a and 30b which extend through the elongate slots 31c.
  • the cable 14a is attached to bolts extending between the bars 30a and 30b adjacent the ends thereof.
  • the bellows 40 may consist of commercially available air springs or air actuators.
  • the bellows 40 Upon inflating the bellows 40 (as via an air supply (not shown) connected to air line 41), the upper housing member 31 is lifted upward and away from lower housing member 30 by the expansion of the bellows 40, as illustrated in Figure 3.
  • the bellows 40 contracts, causing the upper housing member 31 to lower, as illustrated in Figure 4.
  • This expansion and contraction permits the vertical position of the suspended casing 20 to be altered relative to the lower casing member 30 by manually pulling downward on the suspended casing 20 until the pin 23 is properly positioned. Rotation is permitted by a swivel (not shown) mounted between the primary elevator 13 and the single joint elevator 15.
  • a conventional pneumatic supply provides a source of air for the bellows 40.
  • Manually operable means (not shown) are provided to apply the bleed off air from within the bellows 40.
  • An adjustable pressure relief valve is also provided, the venting pressure of which is determined by the characteristics of the particular bellows employed and the desired handling characteristics described below.
  • a single casing 20 is hoisted into. the mast.
  • the bellows 40 is pressurized until the maximum pressure permitted by the relief valve (not shown) is attained.
  • the rig hand may then manually adjust the pressure downward until the preferred pressure is reached. Because of the "lift" provided by the bellows 40, that preferred pressure will be characterized by the seemingly weightless suspension of the casing 20 above the box 22 and the relative ease with which the casing 20 may be manually lowered by the rig hand under the increased control provided by the device, so that the threads of the pin 23 and box 22 may be properly aligned and connected with damage to neither. If the weight of each casing 20 is substantially the same weight as the prior casing, the rig hand may simply adjust the adjustable pressure relief valve to vent at a pressure corresponding to the bellows being nearly fully extended with the load applied.
  • means may be provided to automatically adjust the pressure in the bellows 40 according to the load.
  • Such means could operate, for example by admitting air to the bellows until the upper member 31 and the lower member 30 are spaced apart by a given distance. It would, of course, be necessary to render such automatic means inoperative to enable the casing to be offered up to the assembled casing string.
  • the device may comprise a substantially enclosed first member having a top wall and a bottom wall attached by a side wall.
  • a bellows is mounted in the first member and acts between the bottom wall of the first member and the top wall of a member which extends across the interior of the first member and is connected to lifting straps which extend downwardly from the top member through openings in the bottom wall of the first member.
  • a stop may be provided to limit downward movement of the top wall and thereby prevent the bellows being crushed.

Claims (16)

1. Procédé pour connecter des éléments tubulaires filetés d'une colonne de forage, par exemple des éléments de tubage (20, 21), ce procédé comprenant les étapes consistant à
a) fournir un dispositif comprenant un premier organe (30) fixé à un bloc de levage (10), un second organe (31) auquel un premier élément tubulaire fileté d'une colonne de forage peut être fixé, et des moyens (40) sensibles, directement ou indirectement, à un gaz comprimé agissant entre ledit premier organe (30) et ledit second organe (31);
b) fixer un premier élément tubulaire fileté (20) d'une installation de forage audit second organe (31);
c) soulever ledit bloc de levage (10) pour soulever ledit premier élément tubulaire fileté (20) de la colonne de forage par l'intermédiaire dudit dispositif;
d) faire en sorte que la pression dudit gaz comprimé maintienne ledit premier organe (30) et ledit second organe (31) espacés tout en permettant à une force manuelle orientée vers le bas d'abaisser ledit premier élément tubulaire (20) de la colonne de forage par rapport audit bloc de levage (10);
e) manoeuvrer ledit premier élément tubulaire fileté (20) d'une installation de forage vers une position située au-dessus d'un second élément tubulaire (21) de la colonne de forage;
f) appliquer une pression manuelle vers le bas sur ledit premier élément tubulaire (20) de la colonne de forage pour amener les filets (22, 23) desdits premier et second éléments tubulaires filetés (20, 21) de la colonne de forage en contact; et
g) faire tourner ledit premier élément tubulaire (20) de la colonne de forage par rapport audit second élément tubulaire (21) de la colonne de forage pour connecter lesdits éléments tubulaires filetés (20, 21) de la colonne de forage.
2. Dispositif destiné à la mise en oeuvre du procédé selon l'invention, lequel dispositif comprend:
a) un premier organe (30) pouvant être fixé à un bloc de levage (10);
b) un second organe (31) auquel peut être relié un élément tubulaire fileté (20) d'une colonne de forage; et
c) des moyens élastiques qui, en utilisation, agissent entre ledit premier organe (30) et le second organe (31) et qui permettent audit élément tubulaire fileté (20) d'une colonne de forage de se déplacer vers le bas par rapport audit premier organe (30) quand une pression vers le bas est appliquée audit élément tubulaire fileté (20) d'une colonne de forage,

caractérisé en ce que:
lesdits moyens élastiques comprennent, directement ou indirectement, du gaz comprimé.
3. Dispositif selon la revendication 2, dans lequel l'un (31) desdits premier et second organes (30, 31) comprend une paroi d'extrémité (31a) et une paroi latérale (31b) comportant au moins deux fentes allongées (31c) disposées sur les côtés opposés dudit premier organe (31), et dans lequel l'autre organe (30) est muni d'une barre (30a) qui s'étend à travers lesdites fentes (31c) et dont les extrémités constituent lea points de fixation pour relier ledit autre organe (30) audit bloc de levage (10).
4. Dispositif selon la revendication 3, dans lequel ledit premier organe comprend une enceinte présentant une paroi supérieure, une paroi inférieure et une paroi latérale s'étendant entre elles, dans lequel ledit second organe comprend une paroi supérieure montée sur ledit premier organe et munie de sangles de levage qui s'étendent à travers la paroi inférieure dudit premier organe, et dans lequel lesdits moyens élastiques agissent entre la paroi inférieure dudit premier organe et la paroi supérieure dudit second organe.
5. Dispositif selon la revendication 4, comprenant une butée agencée pour limiter la distance minimale entre lesdits premier et second organes.
6. Dispositif selon la revendication 2, 3, 4 ou 5, dans lequel lesdits moyens élastiques comprennent en outre un ressort.
7. Dispositif selon la revendication 6, comprenant des moyens pour ajuster la rigidité dudit ressort.
8. Dispositif selon la revendication 2, 3, 4 ou 5, dans lequel lesdits moyens élastiques agissent entre ledit premier organe (30) et ledit second organe (31) par l'intermédiaire d'un fluide hydraulique.
9. Dispositif selon l'une quelconque des revendications 2 à 8, comprenant une soupape de sûreté réglable.
10. Dispositif selon l'une quelconque des revendications 2 à 9, comprenant des moyens pour régler la pression dudit gaz comprimé à une valeur désirée.
11. Dispositif selon la revendication 10, comprenant des moyens pour régler automatiquement la pression dudit gaz comprimé et maintenir ledit premier organe (30) et ledit second organe (31) espacés d'une distance donnée quand ledit élément tubulaire fileté (20) d'une colonne de forage est soulevé, lesdits moyens étant capables d'être rendus inopérants pour permettre une pression manuelle vers le bas sur ladite charge pour déplacer ledit élément tubulaire fileté (20) d'une colonne de forage vers le bas par rapport audit premier organe (30).
12. Dispositif selon l'une quelconque des revendications 2 à 11, comprenant un soufflet contenant du gaz comprimé et disposé entre ledit premier organe (30) et ledit second organe (31).
13. Dispositif selon l'une quelconque des revendications 2 à 11, comprenant un piston et un cylindre contenant du gaz comprimé, disposés entre ledit premier organe (30) et ledit second organe (31).
14. Dispositif selon l'une quelconque des revendications précédentes, dans lequel un élévateur secondaire pour tubage unique (15) est relié audit second organe (31).
15. Installation de forage munie d'un dispositif selon l'une quelconque des revendications 2 à 14.
EP85304072A 1984-07-27 1985-06-10 Dispositif pour manipuler des tubages de puits Expired EP0171144B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63493484A 1984-07-27 1984-07-27
US634934 1984-07-27

Publications (2)

Publication Number Publication Date
EP0171144A1 EP0171144A1 (fr) 1986-02-12
EP0171144B1 true EP0171144B1 (fr) 1989-10-18

Family

ID=24545744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304072A Expired EP0171144B1 (fr) 1984-07-27 1985-06-10 Dispositif pour manipuler des tubages de puits

Country Status (5)

Country Link
EP (1) EP0171144B1 (fr)
JP (1) JPS6138089A (fr)
CA (1) CA1239634A (fr)
DE (1) DE3573820D1 (fr)
NO (1) NO176287C (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7665531B2 (en) 1998-07-22 2010-02-23 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7669662B2 (en) 1998-08-24 2010-03-02 Weatherford/Lamb, Inc. Casing feeder
US7694744B2 (en) 2005-01-12 2010-04-13 Weatherford/Lamb, Inc. One-position fill-up and circulating tool and method
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US7757759B2 (en) 2006-04-27 2010-07-20 Weatherford/Lamb, Inc. Torque sub for use with top drive
US7845418B2 (en) 2005-01-18 2010-12-07 Weatherford/Lamb, Inc. Top drive torque booster
US7874352B2 (en) 2003-03-05 2011-01-25 Weatherford/Lamb, Inc. Apparatus for gripping a tubular on a drilling rig
US7882902B2 (en) 2006-11-17 2011-02-08 Weatherford/Lamb, Inc. Top drive interlock
US7887103B2 (en) 2003-05-22 2011-02-15 Watherford/Lamb, Inc. Energizing seal for expandable connections
US7896084B2 (en) 2001-05-17 2011-03-01 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US7895726B2 (en) 2003-05-22 2011-03-01 Weatherford/Lamb, Inc. Tubing connector and method of sealing tubing sections
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390568A (en) * 1992-03-11 1995-02-21 Weatherford/Lamb, Inc. Automatic torque wrenching machine
US6056060A (en) * 1996-08-23 2000-05-02 Weatherford/Lamb, Inc. Compensator system for wellbore tubulars
US5850877A (en) * 1996-08-23 1998-12-22 Weatherford/Lamb, Inc. Joint compensator
US6073699A (en) * 1998-03-06 2000-06-13 Weatherford/Lamb, Inc. Single joint elevator
EA199900854A1 (ru) 1997-03-21 2000-10-30 Петролайн Веллсистемз Лимитед Сборка из расширяемых насосно-компрессорных труб с пазами и способ соединения такой сборки насосно-компрессорных труб
US6039118A (en) * 1997-05-01 2000-03-21 Weatherford/Lamb, Inc. Wellbore tool movement control and method of controlling a wellbore tool
US6070670A (en) * 1997-05-01 2000-06-06 Weatherford/Lamb, Inc. Movement control system for wellbore apparatus and method of controlling a wellbore tool
CA2316307C (fr) * 1997-12-24 2007-05-22 Weatherford/Lamb, Inc. Dispositif de compensation de poids
GB9817246D0 (en) 1998-08-08 1998-10-07 Petroline Wellsystems Ltd Connector
GB2340858A (en) 1998-08-24 2000-03-01 Weatherford Lamb Methods and apparatus for facilitating the connection of tubulars using a top drive
GB2340859A (en) 1998-08-24 2000-03-01 Weatherford Lamb Method and apparatus for facilitating the connection of tubulars using a top drive
GB2340857A (en) 1998-08-24 2000-03-01 Weatherford Lamb An apparatus for facilitating the connection of tubulars and alignment with a top drive
GB2347441B (en) 1998-12-24 2003-03-05 Weatherford Lamb Apparatus and method for facilitating the connection of tubulars using a top drive
GB2345074A (en) 1998-12-24 2000-06-28 Weatherford Lamb Floating joint to facilitate the connection of tubulars using a top drive
GB0221220D0 (en) 2002-09-13 2002-10-23 Weatherford Lamb Expanding coupling
GB0221585D0 (en) 2002-09-17 2002-10-23 Weatherford Lamb Tubing connection arrangement
US6981547B2 (en) 2002-12-06 2006-01-03 Weatherford/Lamb, Inc. Wire lock expandable connection
US8100187B2 (en) 2008-03-28 2012-01-24 Frank's Casing Crew & Rental Tools, Inc. Multipurpose tubular running tool
EP2808482B1 (fr) 2008-10-22 2019-07-31 Frank's International, LLC Outil de pose tubulaire de préhension externe

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US1842638A (en) * 1930-09-29 1932-01-26 Wilson B Wigle Elevating apparatus
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US3351372A (en) * 1966-05-02 1967-11-07 Dresser Ind Split hook hoisting apparatus
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665531B2 (en) 1998-07-22 2010-02-23 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7669662B2 (en) 1998-08-24 2010-03-02 Weatherford/Lamb, Inc. Casing feeder
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US7793719B2 (en) 2000-04-17 2010-09-14 Weatherford/Lamb, Inc. Top drive casing system
US7918273B2 (en) 2000-04-17 2011-04-05 Weatherford/Lamb, Inc. Top drive casing system
US7896084B2 (en) 2001-05-17 2011-03-01 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7874352B2 (en) 2003-03-05 2011-01-25 Weatherford/Lamb, Inc. Apparatus for gripping a tubular on a drilling rig
US7895726B2 (en) 2003-05-22 2011-03-01 Weatherford/Lamb, Inc. Tubing connector and method of sealing tubing sections
US7887103B2 (en) 2003-05-22 2011-02-15 Watherford/Lamb, Inc. Energizing seal for expandable connections
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7694744B2 (en) 2005-01-12 2010-04-13 Weatherford/Lamb, Inc. One-position fill-up and circulating tool and method
US7845418B2 (en) 2005-01-18 2010-12-07 Weatherford/Lamb, Inc. Top drive torque booster
US7757759B2 (en) 2006-04-27 2010-07-20 Weatherford/Lamb, Inc. Torque sub for use with top drive
US7882902B2 (en) 2006-11-17 2011-02-08 Weatherford/Lamb, Inc. Top drive interlock

Also Published As

Publication number Publication date
JPS6138089A (ja) 1986-02-24
CA1239634A (fr) 1988-07-26
NO176287C (no) 1995-03-08
NO176287B (no) 1994-11-28
EP0171144A1 (fr) 1986-02-12
DE3573820D1 (en) 1989-11-23
NO852336L (no) 1986-01-28

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