US3507325A - Well cementing apparatus - Google Patents

Well cementing apparatus Download PDF

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Publication number
US3507325A
US3507325A US721650A US3507325DA US3507325A US 3507325 A US3507325 A US 3507325A US 721650 A US721650 A US 721650A US 3507325D A US3507325D A US 3507325DA US 3507325 A US3507325 A US 3507325A
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United States
Prior art keywords
plug
casing
cementing
well
head
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 - Lifetime
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US721650A
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English (en)
Inventor
Lyle B Scott
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.)
Hughes Tool Co
Byron Jackson Inc
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Byron Jackson Inc
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Assigned to HUGHES TOOL COMPANY, A CORP. OF DEL. reassignment HUGHES TOOL COMPANY, A CORP. OF DEL. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BJ-HUGHES INC.,
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    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
    • E21B33/076—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/04—Casing heads; Suspending casings or tubings in well heads
    • E21B33/05—Cementing-heads, e.g. having provision for introducing cementing plugs
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • E21B33/16—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor
    • E21B33/165—Cementing plugs specially adapted for being released down-hole

Definitions

  • the present invention provides a well cementing head which is adapted to be lowered through the water on a length of well pipe, such as drill pipe, and to be connected to the subsurface well head in order to enable the performance of casing cementing operations involving the use of top and bottom plugs which, in the prior surface cementing operations, could be readily placed into the fluid stream between a body of circulating uid and the body of fluent cement so as to separate the cement from the circulating fluid.
  • the invention further provides, in a cementing head as referred to above, means whereby the top and bottom plugs are releasably retained in the cementing head as the latter is being run into its operative position at the subsurface well head, together with a first device adapted to be placed in the running in string of pipe between the circulating uid and the stream of uent cement and to travel in the uid stream into engagement with the bottom plug, passing through the upper plug, so as to prevent further flow of fluid through the bottom plug, whereupon the latter will be dislodged from its support and carried downwardly through the well casing to a seat which will arrest further downward movement of the bottom plug, whereupon the aforementioned device will be forced through the bottom plug and captured in a cage, a second device
  • An object of the invention is to provide a rugged cementing head adapted to be disposed in a well head beneath the surface of the water and adapted to releasably support top and bottom cementing plugs in such a manner that the top and bottom plugs may be dislodged upon engagement by devices adapted to prevent the flow of circulating fluid or cement, as the case may be, through the respective plugs.
  • an object of the invention is to provide a cementing head as aforesaid in which latch elements engage the top and bottom cementing plugs and are held in engagement therewith by shearable members, whereby, upon engagement of a device with one of the plugs whereby to prevent the ow of fluid through the plug, the pressure of the fluid stream acting across the closed plug will shear the shearable elements allowing the plug to move downwardly along with the fluid stream.
  • the device for dislodging the bottom plug by shearing the shearable elements may comprise a deformable member, such as a resilient ball, adapted to sustain suflicient differential pressure thereacross as to cause shearing of the shearable elements and downward movement of the plug through the well casing, but being deformable so as to be forced through the bottom plug when the latter engages a seat in the casing.
  • a deformable member such as a resilient ball
  • the device for dislodging the top plug may comprise a non-deformable member, such as a hard ball, adapted to engage the top plug and cause shearing of the shearable elements in response to the differential pressure across the plug, and, in accordance with one embodiment disclosed herein, the hard device may be adapted to interlock with the top plug so as to prevent the backflow of cement following seating of the top plug on the bottom plug.
  • a non-deformable member such as a hard ball
  • FIG. 1 is a view diagrammatically illustrating, partly in elevation and partly in vertical section, well cementing apparatus in accordance with the invention in place in an underwater support structure therefor to enable the cementing of a string of well casing extending into a well to be completed at the oor of a body of water;
  • FIG. '2 is an enlarged fragmentary view in vertical section illustrating the cementing head with top and bottom plugs therein and the catcher in the casing;
  • FIG. 3 is a view in horizontal section, as taken on the line 3 3 of FIG. 2;
  • FIG. 4 is a fragmentary view in vertical section, showing release of the bottom plug during the cementing operation
  • FIG. 5 is a view in vertical section, showing the bottom plug arrested by the catcher within the casing
  • FIG. 6 is a View generally corresponding to FIG. 5, but also showing the top plug arrested by the bottom plug;
  • FIG.' 7 is"aview in" vertical section generally-'corresponding to FIG. 4, but showing a modified form of device for dislodging the top plug from the cementing head.
  • FIG. l there is diagrammatically illustrated apparatus for enabling the conduct of various well drilling and well completion operations"4 from a barge''o'r otherv platform located above 'a body vof water at the bottom of which is a floor'F, which floor is penetrated by the well bore.
  • the subsurface apparatus may b'e of any known construction but, for illustrative purposes, includes a so-'called drive'pipe 1 extending downwardly into the Boor F a desired distance.
  • a: frame structure2 including a suitable number of upwardly extended guide columns 3 which are spaced about the 'well and which guide supporting elements 4 for various instrumentalities including, or'example, ⁇ a blowout preventer assembly ⁇ 5 which maybe of any desired type adapted for underwater drillingy and completion of wells; Extending upwardly from the blowout .preventer screw plugs 25j.
  • the member 2Sf is supported in a first position by a shearable pin 25k which also extends between the side walls 251e and is retained in place by screw plugs 25m'.
  • the members 25Jc Projecting-inwardly and downwardly at air angle from the arms 25g, the members 25Jc are respectively provided with portions v25a having inwardly extended fingers or extremities 25p.
  • the fingers or extremities 25p are disposed within the bore of the body so as to engage beneath the lower end of a top cementing plug TP,which will hereinafter be described.
  • a conductor pipe 6 which may extend a suitable disl tance upwardly in a body of water and have a sliding fit with a further upwardly extending conduit or pipe -7 sealingly and slidingly engaged with the conductor 6 as at 8, whereby to' accommodate for rise and fall of a oating vessel having a derrick thereon, the derrick also being adapted to have thereon the necessary cement displacement equipment or -pumping and mixing apparatus useful in the cementing of wells.
  • a casing head 9 is illustrated as'being supported by the structure 2, and this casing head may be of any desired construction adapted to removably receive in the usual manner a casing hanger 10 which is releasably connected in the casing head 9 as at 11.
  • a string of well casing 12 which may extend a number of thousands of feet downwardly into the earth formation andy which, in the usage of the present invention, may be cemented in the well bore.
  • a 'joint 15 adapted to be threadedly connected tol theY upperend of the 'cementing' head assembly;
  • At 'thelower endf the f emen'ting'head assembly H is a left-hand acme lthread 16 adapted to threadedly/eng'ag'e in ac'omp-lemental thread in' the casing'hanger-'lll vso las to releasably connect the cementinghead in communication with the casing;
  • the casing head assembly H yl will be' seento "comprise a-ll'ongitudinally extended tubular body.. 20 --connected by. a tubular sub. 21 :to the joint 1S ofthe drill pipe string 14', thel body 20 having at its lower end a 'coupling-22 provided with kthe acme. thread 16 previouslymreferred to for connection to the casing hanger j 1,0. Top plugy supporting-means generally.
  • top plugfsupport'- ingA means 25 includes' a' pair of diame'trcally opposed The bottbmplug supporting means 26, like lthe top plug supporting. means 25, includes a pair of diametrically spacedhousing sections 26a disposed in windows 2Gb in the body 20 and suitably secured as by welding at 26e.
  • the sections 26a provide a chamber 26d defined between opposing side walls 26e, and between these side walls there is pivotally supported a bottom plug supporting member 26]c having an arm 26g pivotally mounted on a pin 26h, this pin also being retained in the respective housing by screw plugs 26]'.
  • the bottom plug supporting member ,261 isheld in a rst position by a shearable pin 26k, this pin being retained in thesupports by screw plugs 26m; and angularly downwardly extended portions 26u of the members 2'61 are provided withextremities or fingers 26p projecting inwardly toward one another for supporting thereon a bottom plug BP, which will hereinafter be described.
  • the top plug TP comprises an inner tubular rigid body 30 which is preferably composed of drillable material having a central opening or passage 31 therethrough. Molded about the body 30 is an elastomeric body 32 having a suitable number of vertically spaced, outwardly extending ribs or lips 33 thereon adapted for wiping engagement with the casing wall during the cementing operation hereinafter to be described; and at the upper end of the elastomeric body 32 is an outwardly extending cuplike lip 34 adapted for sealing and sliding engagement in the casing during the performance of the cementing operation hereinafter. to be described.
  • rigid body 30 At its upper end, rigid body 30 has a beveled wall 3S over which is'disposed a section 36 of the elastomeric material whereby to form a seat.r for a device ,or element which will hereinafter be described and which is adapted to dislodge the top plug from the supporting means 25;. and at the lower end of the plug body 30 the elastomeric material -extends inwardly to provide a sealingange 37 adapted to engage the bottom plug, as will'also be hereinafter described;
  • the Abottom plug BP is essentially constructed in the same manner as the top plug TP in that the bottomplug comprises -an inner rigid, andl preferably drillable, body ⁇ 40 having a central bore orpassage 41, this bore 41 being of a-.diameter less than the diameter of the bore 31 in the ytop plug TP,- as is clearly apparent in FIG. 2.
  • an elastomerio body 42 having wiper lips or ribs'43 and an upwardly extending'sealing cup-like lip 44; yAt the upper end of the body-40 the elastomeric materialcxtends inwardlyhto provide a sealing ange 46, and at the lower end of the body 40 the elastomeric material may extend inwardly-and Vforms a ange 47.
  • a truste-conical surface 48 which is adapted to engage with the catcher C, previously referred to, dur.- ingthe performance of the cementing operation Vhereinafter to be described.
  • the catcher C as seen in FIG. 2, comprises Aa .ringlikeV support 50 adapted-to be disposed between-the adjacent ends of lengths of the casing string 12 within the casing coupling 13, therel being a seal ring 51 provided in the illustrative embodiment engageable between-the inner periphery of the coupling 13 and a seal ring seat 52 provided in the ring 50, as well as with the lower extremity 54 of the upper length of casing in the string 12.
  • the catcher ring S0 is provided with a frusto-conical seat 55 which, as will be hereinafter described, is sealingly engageable by the frusto-conical lower end 48 of the elastomer body 42 of the bottom plug BP.
  • the bottom plug BP is shown as being dislodged from the supporting means 26, in response to engagement of a device illustrated as a ball B1 having a size larger than the passage 41 through the bottom plug BP.
  • a device illustrated as a ball B1 having a size larger than the passage 41 through the bottom plug BP.
  • the ball B1 may be admitted into a fluid stream at the top of the string of drill pipe 14 and will travel with the fluid stream into engagement with the bottom plug BP, passing through the larger diameter passage 31 in the top plug TP.
  • an effective barrier is provided, as a result of which fluid is prevented from passing through the plug and pressure will be developed acting across the plug, as the sealing cup-like lip 44 is forced into tight sealing engagement with the body of the cementing head asembly.
  • the pressure developed across the bottom plug BP is sufficient to cause the pins 26k to be sheared, as shown in FIG. 4, whereby the plug supporting members 26f will be allowed to pivot to the second position shown in this figure, at which the fingers 26p are retracted from beneath the lower end of the bottom plug BP whereupon the plug is free to move downwardly in the well casing until, as shown in FIG. 5, it engages the catcher C.
  • FIG. 6 another device illustratively in the form of a second ball B2 is illustrated, which, like the ball B1, is adapted to be introduced into the fluid stream at the top of the drilling pipe 14 and to move with the fluid until the ball B2 engages the seat 36 at the upper end of the top plug TP, through which fluid was previously free to flow.
  • the top plug Upon engagement of the ball B2 with the top plug TP, the top plug will be dislodged from its support in the same manner as previously described in relation to the bottom plug BP and as illustrated in FIG. 4, without requiring further specific illustration. It will simply be understood in this connection that the top plug supporting members 25f will be forced to the second position corresponding to the second position f shown in FIG. 4 as a result of shearing of the pins 25k.
  • the spear includes a suitable elastomeric cup 76 molded about a iiange 77 and providing a lip seal with the tubular conduit so that the following iiuid will act upon the spear to force it downwardly therewith and forcibly into the opening 31 of the top plug TP.
  • the device B2 and the plug BP may be provided with cooperative latch means such as, for example, the latch means illustrated in FIG. 7, in association with the spear B2.
  • the latch means comprises a split resilient latch ring 78 disposed in an annular groove 79 within the upper end portion of the plug body 30 and normally resiliently projecting into the openingl 31 so as to be engaged by the body 70 of the spear B2 as it enters the opening 31 and spread circumferentially by the tapered nose 71 of the spear B2.
  • the body 70 of the spear above the seal ring 73, is provided with an annular recess 79a into which the split lock ring 78 is adapted to contract so as to latch the spear in place.
  • said top and bottom plugs having central passages for the flow of fluid therethrough and adapted to be closed by devices in the iluid to cause release of said plug supporting means;
  • said plug supporting means each comprises members having ends turned toward one another, pivot means for each member, and a shear pin engaged with each member for holding the same in a rst plug supporting position, said pivot means including a pivot pin and a vertically elongated slot for allowing initial movement of said members toward second plug releasing positions and shearing of said shear pins.
  • said cementing head having top plug supporting means and bottom plug supporting means for releasably supporting a top plug and a bottom plug respectively;
  • said top and bottom plugs having central passages for the flow of uid therethrough and adapted to be closed by devices in the fluid to cause release of said plug supporting means;
  • said plug supporting means each comprises a pair of spaced chambers in said cementing head, a pivot pin in each chamber, a member in each chamber having a vertically elongated slot through which said pivot pin extends, a shear pin holding said member with said pivot pin spaced below the top of said slot, and said lmember having an inturned end extending into said cementing head for engagement by the respective plug.
  • each of said plug supporting means including members shiftably mounted for movement from a iirst plug supporting position to a second plug releasing position;
  • said members have vertically elongated slots therein, and including pivot pins extending through said slots, and said means for holding said members in said rst position includes shear pin holding said members in said first position with said pivot pins spaced below the top of said slots.
  • said support means including a casing hanger for supporting a string of casing in the well;
  • a cementing head including an elongated tubular body
  • each of said supporting means including plug engaging members movable from a first plug supporting position to a second plug releasing position;
  • each of said members includes a vertically extended portion having an enlongated slot, and including a pivot pin extending through said slot, and said means releasable upon closure of said passages through said plugs comprising a shearable element holding the respective members in a position with siid pivot pin spaced below the top of said elongated s ot.
  • said support means including a casing hanger for supporting a string of casing in the well;
  • a cementing head including an elongated tubular body
  • each of said supporting means including plug en ⁇ gaging members movable from a rst plug supporting position to a second plug releasing position;
  • said first means comprises a body of resiliently deformable material of a CII size capable of passing through the passage of said top plug but closing the passage of said bottom plug
  • said second means comprises an elongated spear having a body adapted to lit into the passage of said top plug, said top plug and said body having cooperative latch means for retaining said body in said top plug.
  • spear includes an elongated stern on said body and an elastomeric cup having a sealing lip, said stem having centralizing means adjacent its upper end for preventing cooking of said spear in said lluid conduit pipe.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Earth Drilling (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
US721650A 1968-04-16 1968-04-16 Well cementing apparatus Expired - Lifetime US3507325A (en)

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US72165068A 1968-04-16 1968-04-16

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US721650A Expired - Lifetime US3507325A (en) 1968-04-16 1968-04-16 Well cementing apparatus

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US (1) US3507325A (enrdf_load_stackoverflow)
AT (1) AT287619B (enrdf_load_stackoverflow)
DE (1) DE1918201A1 (enrdf_load_stackoverflow)
FR (1) FR2006317A1 (enrdf_load_stackoverflow)
GB (1) GB1232145A (enrdf_load_stackoverflow)
NL (1) NL6905844A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616850A (en) * 1970-04-20 1971-11-02 Byron Jackson Inc Cementing plug launching mandrel
US3730267A (en) * 1971-03-25 1973-05-01 Byron Jackson Inc Subsea well stage cementing system
US3951208A (en) * 1975-03-19 1976-04-20 Delano Charles G Technique for cementing well bore casing
US4345651A (en) * 1980-03-21 1982-08-24 Baker International Corporation Apparatus and method for the mechanical sequential release of cementing plugs
US4479545A (en) * 1982-10-27 1984-10-30 Eley Fred N Well-cementing stage collar
US4979562A (en) * 1988-10-21 1990-12-25 Weatherford U.S., Inc. Float equipment including float collars and modular plugs for well operations
US5390736A (en) * 1992-12-22 1995-02-21 Weatherford/Lamb, Inc. Anti-rotation devices for use with well tools
US6244350B1 (en) 1996-12-06 2001-06-12 Weatherford/Lamb, Inc. Apparatus for launching at least one plug into a tubular in a wellbore
US20110198082A1 (en) * 2010-02-18 2011-08-18 Ncs Oilfield Services Canada Inc. Downhole tool assembly with debris relief, and method for using same
US8931559B2 (en) 2012-03-23 2015-01-13 Ncs Oilfield Services Canada, Inc. Downhole isolation and depressurization tool
CN104989319A (zh) * 2015-05-26 2015-10-21 成都高普石油工程技术有限公司 一种石油勘探中采用连续注水泥方式的固井方法
CN113431519A (zh) * 2021-06-30 2021-09-24 湖北鄂西新能源有限公司 一种小井眼注浆固井方法及装置
US11466534B2 (en) 2019-05-09 2022-10-11 Noetic Technologies Inc. Cementing head apparatus
US20240052715A1 (en) * 2022-08-11 2024-02-15 Baker Hughes Oilfield Operations Llc Asymmetric release device, method, and system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2341404A (en) * 1998-09-12 2000-03-15 Weatherford Lamb Plug and plug set for use in a wellbore
CN108452398B (zh) * 2018-05-14 2023-12-15 江苏诚益达智能科技有限公司 一种非电驱动便携式输注装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772871A (en) * 1928-10-22 1930-08-12 John W Macclatchie Well cementing
US2104270A (en) * 1937-05-24 1938-01-04 Halliburton Oil Well Cementing Cementing equipment for wells
US2169568A (en) * 1938-04-02 1939-08-15 Halliburton Oil Well Cementing Apparatus for multiple stage cementing
US2615519A (en) * 1947-06-30 1952-10-28 Charles J Carr Plug handling head for well casings
US3364996A (en) * 1966-02-04 1968-01-23 Brown Oil Tools Apparatus for cementing well liners

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772871A (en) * 1928-10-22 1930-08-12 John W Macclatchie Well cementing
US2104270A (en) * 1937-05-24 1938-01-04 Halliburton Oil Well Cementing Cementing equipment for wells
US2169568A (en) * 1938-04-02 1939-08-15 Halliburton Oil Well Cementing Apparatus for multiple stage cementing
US2615519A (en) * 1947-06-30 1952-10-28 Charles J Carr Plug handling head for well casings
US3364996A (en) * 1966-02-04 1968-01-23 Brown Oil Tools Apparatus for cementing well liners

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616850A (en) * 1970-04-20 1971-11-02 Byron Jackson Inc Cementing plug launching mandrel
US3730267A (en) * 1971-03-25 1973-05-01 Byron Jackson Inc Subsea well stage cementing system
US3951208A (en) * 1975-03-19 1976-04-20 Delano Charles G Technique for cementing well bore casing
US4345651A (en) * 1980-03-21 1982-08-24 Baker International Corporation Apparatus and method for the mechanical sequential release of cementing plugs
US4479545A (en) * 1982-10-27 1984-10-30 Eley Fred N Well-cementing stage collar
US4979562A (en) * 1988-10-21 1990-12-25 Weatherford U.S., Inc. Float equipment including float collars and modular plugs for well operations
US5390736A (en) * 1992-12-22 1995-02-21 Weatherford/Lamb, Inc. Anti-rotation devices for use with well tools
US6244350B1 (en) 1996-12-06 2001-06-12 Weatherford/Lamb, Inc. Apparatus for launching at least one plug into a tubular in a wellbore
US20110198082A1 (en) * 2010-02-18 2011-08-18 Ncs Oilfield Services Canada Inc. Downhole tool assembly with debris relief, and method for using same
US8490702B2 (en) 2010-02-18 2013-07-23 Ncs Oilfield Services Canada Inc. Downhole tool assembly with debris relief, and method for using same
US9334714B2 (en) 2010-02-18 2016-05-10 NCS Multistage, LLC Downhole assembly with debris relief, and method for using same
US8931559B2 (en) 2012-03-23 2015-01-13 Ncs Oilfield Services Canada, Inc. Downhole isolation and depressurization tool
US9140098B2 (en) 2012-03-23 2015-09-22 NCS Multistage, LLC Downhole isolation and depressurization tool
CN104989319A (zh) * 2015-05-26 2015-10-21 成都高普石油工程技术有限公司 一种石油勘探中采用连续注水泥方式的固井方法
US11466534B2 (en) 2019-05-09 2022-10-11 Noetic Technologies Inc. Cementing head apparatus
EP3966421A4 (en) * 2019-05-09 2022-12-07 Noetic Technologies Inc. CEMENTING HEAD APPARATUS
CN113431519A (zh) * 2021-06-30 2021-09-24 湖北鄂西新能源有限公司 一种小井眼注浆固井方法及装置
US20240052715A1 (en) * 2022-08-11 2024-02-15 Baker Hughes Oilfield Operations Llc Asymmetric release device, method, and system
US12084930B2 (en) * 2022-08-11 2024-09-10 Baker Hughes Oilfield Operations Llc Asymmetric release device, method, and system

Also Published As

Publication number Publication date
AT287619B (de) 1971-01-25
FR2006317A1 (enrdf_load_stackoverflow) 1969-12-26
DE1918201A1 (de) 1969-11-06
GB1232145A (enrdf_load_stackoverflow) 1971-05-19
NL6905844A (enrdf_load_stackoverflow) 1969-10-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HUGHES TOOL COMPANY, P.O. BOX 2539, HOUSTON, TX. 7

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BJ-HUGHES INC.,;REEL/FRAME:004098/0273

Effective date: 19821231