US3658287A - Swinging blowout preventer head with fluid connector - Google Patents

Swinging blowout preventer head with fluid connector Download PDF

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Publication number
US3658287A
US3658287A US95155A US3658287DA US3658287A US 3658287 A US3658287 A US 3658287A US 95155 A US95155 A US 95155A US 3658287D A US3658287D A US 3658287DA US 3658287 A US3658287 A US 3658287A
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United States
Prior art keywords
head
fluid
connector
hinge
movable
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Expired - Lifetime
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US95155A
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English (en)
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Robert K Lerouax
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Hydril LLC
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Hydril LLC
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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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
    • E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams

Definitions

  • ABSTRACT A swinging blowout preventer head with fluid connector wherein the swinging head is pivotally connected to a blowout preventer body so that a hydraulic fluid system to the ram cylinder mounted with the head remains sealed off at all times, including during the swinging of the head to and from its open and closed positions.
  • Such fluid connector is non-load bearing, and preferably is capable of lateral movement as well as arcuate movement to assure sealing abutment between the body and the swinging head in the closed position while still confining the hydraulic fluid in the fluid system.
  • blowout preventers having swinging heads are those shown in U.S. Pat. Nos. 2,942,616 and 2,946,550.
  • U.S. Pat. No. 2,942,616 the hydraulic linesare opened when each head is swung to its open position so that all or part of the fluid is lost each time the head is opened.
  • U.S. Pat. No. 2,946,550 the hydraulic fluid flows through the load bearing hinges so that ,the load on the hinges causes wear on the seals for the fluid pressure with resultant leakage of the hydraulic fluid from the system.
  • the present invention relates to a swinging blowout preventer head with a fluid connector which solves the problems of the prior art so that it can be moved to and from its open and closed positions without losing the hydraulic fluid used for operating the ram, and which has seals which are nonload bearing so that wear thereon is minimized.
  • the heads are arcuately and laterally movable relative to the preventer. body in the preferred embodiment so that each head may approach the body in a straight line rather than being confined to the arc defined by the hinge means to assure sealing abutment between the swinging head and the preventer body without strain on the hinge means, and with the fluid connector so constructed that it maintains the fluid flow passages sealed off during such movements.
  • the center line of the hinges or pivots for each swinging head is in a plane which is offset relative to the plane of the body-head interface so as to provide the shortest preventer with swinging heads.
  • FIG. 1 is an elevation of one form of the blowout preventer of this invention
  • FIG. 2 is aplan view of the blowout preventer of FIG. .1, with one of the heads in the closed position and the other of the heads in the open position, and with a portion of the head in the open position being shown in section;
  • FIG.3 is aview taken on line 3-3 of FIG. 2 and it illustrates in particular the upper hinge assembly and the flexible fluid connector for each of the swinging heads of the-present inventron;
  • FIG. 4 is a view taken on line 4-4 of FIG. 3 to illustrate further details of the hinge means and the flexible fluid connector for each of the swinging heads;
  • FIG. 5 is a view taken on line 5--5 to illustrate in particular the offset hinge construction whichis preferably used.
  • the letter A designates generally the blowout preventer of this invention which has a blowout preventer body B, with at least one, and preferably two swinging heads or bonnets H-1 and H2 connected to the body .8 for swinging movements to and from closed and open positions, as will be explained in detail.
  • the head H2 is illustrated in the closed position while the head 11-1 is illustrated in the open position.
  • the heads H-1 and H2 have blowout preventer rams R-1 and R-2, respectively, mounted therewith for movements to and from a ram-closed position and a ram-open position, as will be more fully explained.
  • Hydraulic fluid or other fluid under pressure is supplied to cylinders C-1 and C-2 with the heads 11-! and H2, respectively, for controlling the movements of the rams R-1 and R2, with such fluid being directed through flexible fluid connectors F-l'and F-2, which will be described in detail hereinafter.
  • the blowout preventer body B is of any conventional construction for receiving one or a pair of swinging heads and it includes a central longitudinal opening 10 through which pipe may pass when the rams R-1 and R-2 are in the open or retracted position. Also, the body B includes a pair of side openings 11, each of which is adapted to receive one of the rams R-1 and R-2 (FIG. 2) as each of such rams moves to and from the closed position, which is the position shown for the ram R-Z in FIG. 2. It will be understood that the body B is connected in a wellhead above a pipe string (not shown) by upper and lower studded flanges 14 on the body B having openings 12 in which studs (not shown) are conventionally positioned.
  • the bore of the pipe string is longitudinally aligned with the vertical or longitudinal opening 10in the body B, so that when the heads H-l and H2 are in their closed position, as illustrated for the head H2 in FIG. 2, and the rams R-l and R-2 are in their open position, the full opening of the longitudinal bore or opening 10 in the body B is provided so that the rams do not obstruct or interfere with the movement of well pipe or tools therethrough.
  • the rams R-l and R-Z may be of any conventional construction and may either be blind rams which contact each other to completely close off the opening 10 when no pipe or other object is disposed in the longitudinal bore 10, or they may be pipe rams which seal around a well pipe which is disposed in the bore 10 to prevent fluid flow around the annulus surrounding such pipe, as is well understood.
  • the ram 11-1 is connected to a piston 15 by a piston rod 16 so that fluid pressure within the cylinder C-l acting on the piston 15 transmits its movements through the rod 16 to the ram R-l in the known manner. Suitable O-rings or other seals 17 engage the rod 16 to confine fluid pressure within the cylinder C-l.
  • the ram R-2 is similarly connected to a piston 15 through a piston rod 16, with the piston 15 being in the cylinder C-2.
  • the cylinders C-1 and C-2 are secured to their heads H-1 and H2, respectively by any suitable securing means such as a plurality of bolts 18, in the known manner, so that the cylinders C-1 and C-2 move with their heads or bonnets 1-1-1 and H2 in their movements relative to the body B.
  • the heads l-I-l and H2 are in the closed position, they are secured to the body B by any suitable securing means such as bolts 20, in the known manner.
  • hinge means P-1 and P-2 Each of the'heads 1-1-1 and H2, and the parts connected with each of such heads, is pivotally mounted on the body B by hinge means P-1 and P-2, respectively.
  • the hinge means P-l takes substantially all ofthe load of the head Hl and the parts therewith so that the fluid connector F-l is a non-load bearing structure.
  • the hinge means P-2 takes substantially all of the load of the head H2 and the parts therewith so that the flexiblefluid connector F-2 is a non-load bearing structure.
  • the details of the upper hinge assembly of the hinge means P-2 is illustrated in detail in FIGS.
  • FIGS. 3-5 and such structure is preferably identical to that used for the upper hinge assembly of the hinge means P-l as well as the lower hinge assemblies of the hinge means P-2 and P-l. Therefore, the detailed description of the hinge assembly illustrated in FIGS. 3-5 relates to each of the hinge assemblies in the two hinge means P-1 and P-2.
  • the upper hinge assembly of the hinge means P2 includes a fixed hinge member 25 which is in the form of a tongue of generally cylindrical shape with a central opening 25a through which a hinge pin 27 extends, as will be more fully explained.
  • the fixed hinge member 25 has a base or flange 25b projecting from one portion thereof which is adapted to be welded or otherwise secured to the body B.
  • a movable hinge member 30 which is generally in the shape of a clevis with an opening 30a to receive the fixed member or tongue 25, forms the other part of the hinge assembly and it is secured to the head or bonnet H-l or H2.
  • the movable hinge member 30 has aligned openings 30b therethrough, through which the hinge pin 27 extends when such openings 30b are aligned with the opening 25a in the member 25.
  • Washers 31 are preferably disposed above and below the member 25, with suitable O-rings 32 surrounding the washer (FIGS. 3 and 4).
  • the hinge pin 27 is preferably in the form of a bolt having a head 270 with a washer and O-ring 28 between the head and the upper surface of the movable hinge member 30.
  • the hinge pin or bolt 27 has threads 2712 for receiving a nut 29 and a sealing type lock nut 33, which nuts may be one-piece, and with a washer and O-ring 34 between the nut 29 and the lower surface ofthe movable member 30.
  • an annular space is provided between the bore 25a of the fixed member 25 and the portion of the hinge pin 27 which is within such bore.
  • the diameter of the hinge pin 27 is reduced at 270 to provide such annular space 40 and to permit the relative lateral movement of the hinge member 30 relative to the hinge member 25 so that the head can move in a substantially straight line, i.e., both arcuately and laterally, to and from the open and closed positions.
  • a suitable opening 25c is provided for receiving a grease fitting 38 of any conventional construction so as to provide for lubricating the hinge at the hinge pin and the adjacent parts.
  • the O-rings 32 serve to assist in confining the grease or other lubricant within the annular space 40.
  • the hinge means P-1 and P-2 are each disposed in a plane which is different from the plane of the interface between the head H! or the head H-2 and the body B, such as represented at the line 40 for such interface. Because of such offset relationship in which the plane of the hinge pins 27 is positioned relative to the plane of the head-body interface 40, the head or bonnet I-I-l or H-2 has the shortest possible length, which can best be determined by trial and error location of such planes. Also, because of the lateral and arcuate movements of each of the heads relative to the body B during the closing movement thereof, there is an assurance of an abutment between the body B and the head in the final closed position.
  • the fluid connector F-2 includes a fixed connector member or yoke which is preferably secured to the body B by means of a plurality of stud bolts 51 which are threaded into the body B at threaded openings 52 (FIG. 3).
  • the fixed connector member 50 is formed with a pocket 50a which is adapted to receive a connector arm of a movable connector member 55 which is secured to the head l-I-2 by any suitable means such as a plurality ofstud bolts 56 (FIG. 4).
  • the fixed connector 50 has an inlet passage 50b which communicates with a lateral passage 50c in the connector member 50, and also with a fluid passage 57 in the body B.
  • An inlet tube 60 is connected from any suitable source of hydraulic fluid under pressure (not shown) so as to supply hydraulic fluid to the system.
  • a similar lower inlet flow passage 50a is provided in the fixed connector member 50 in communication with a lateral fluid flow passage 502 in the member 50 and with a fluid passage 61 in the body B.
  • a tube 62 is connected to the passage 50d for supplying hydraulic fluid under pressure to the inlet passage 50d.
  • the lines 60 and 62 are alternately used for directing fluid under pressure and for returning fluid under pressure, depending upon the direction in which the rams R-1 and R-Z are to be moved, as will be well understood by those skilled in the art.
  • Suitable O-rings or other seals 63 are provided around the passages 50b and 50d, between the fixed connector member 50 and the body B to prevent leakage of the hydraulic fluid at such areas.
  • the movable connector member 55 has lateral flow passages 55a and 55b which are in fluid communication with lateral passages 50c and 50e, respectively, and are sealed off by a suitable seal means such as O-rings 65.
  • the fluid passage 55a in the movable connector member 55 is in fluid communication with a fluid passage 70 formed in the head I-I-l or H-2. Such fluid passage 70 directs the hydraulic fluid to the area of the cylinder C-l or C-2 which is inwardly of the piston 15 (FIG. 2).
  • the fluid passage 55b in the connector 55 is in fluid communication with a fluid passage 71 which is disposed below the passage 70 (not visible in FIG. 2) and which is also in communication with a continuation of such fluid passage 71a in the cylinder C-l or C-2 for introducing the hydraulic fluid under pressure to the area of the piston 15 outwardly thereof.
  • the fluid passages in the fixed connectors 50 of the fluid connectors F-l and F-2 are preferably interconnected through the fluid passages 57 and 61 preferably formed in the body B (FIGS. 2 and 3), although each of the fluid connectors F-l and F-2 may be supplied with hydraulic fluid under pressure separately without the use of interconnecting passages such as the passages 57 and 61, and therefore the rams R-1 and R-2 may be controlled separately, if so desired.
  • the diameter or size of the passage 500 is smaller than the diameter or size of the opening of the fluid passage 5511.
  • the size or diameter of the opening of the fluid passage 50:: is smaller than the diameter or size of the opening of the passage 55b.
  • each of the heads H-1 and I-I-Z is provided with a hinge means P-1 and P-2, respectively for taking the load or weight of the heads during their movements and when in the open position in particular.
  • the location of the hinge pins 27 for each of the hinge means P-1 and P-2 in a position inwardly of the interface 40' between the body and the head provides for the shortest possible length of the overall blowout preventer because the arcuate path of movement of the heads to and from the closed position is minimized.
  • the heads may be moved in a substantially straight line because of the lateral shifting permitted at the hinge pins between the heads and the body B.
  • the fluid system remains in sealed and operative condition during the pivotal movements of the heads l-l-ll and H-2, even though there is the lateral play or shifting permitted at the hinge means P-1 and P-2. Therefore, the separate fluid connectors F-l and F2 make the lateral shifting of the hinge means P-1 and P-Z possible.
  • the axis of rotation of the connector members 50 and 55 is preferably in longitudinal or vertical alignment with the axis of rotation of the hinge assemblies through the hinge pins 27 thereabove and therebelow for both of the heads H-1 and H-2.
  • each of the pivot or hingepins 27 may have the same external diameter throughout its length, and the annular space 40 may be provided by having the diameter of the longitudinal bore or passage 25a greater than that of the longitudinal openings 30b so as to permit the lateral relative movement between the hinge members 30 and 25.
  • a blowout preventer comprising:
  • blowout preventer body having a longitudinal opening through which a pipe string is adapted to extend
  • said body also having at least one side opening in communication with said longitudinal opening;
  • a preventer head disposed on one side of said body for movement relative thereto from a closed position in contact with said body to an open position wherein said side opening is exposed;
  • a ram slidably mounted in said head for movement relative to said head from a ram-closing position to a ram-open position, and having a ram piston therewith disposed in said cylinder for effecting the movements of said ram relative to said head;
  • hinge means pivotally connecting said head to said body for pivotal movements of said head to and from its open and closed position
  • fluid connector means for directing fluid pressure to said fluid passage means
  • said fluid connector means including:
  • said hinge means support substantially all of the load of said head and the parts therewith, whereby said fluid connector members are non-loading bearing members.
  • hinge means between said fixed and movable connector members for sealing therebetween at the interconnection between said fluid passages in said members.
  • said opening through said fixed hinge member being larger than the diameter of the portion of said hinge pin disposed within said opening for permitting lateral movement of said pin and movable hinge member therewith relative to said fixed hinge member.
  • said movable connector member is rotatable and laterally movable relative to said fixed connector member within the limits of the lateral movement of said movable hinge member relative to said fixed hinge member.
  • seal means between said fixed and movable connector members for sealing therebetween at the interconnection between said fluid passages in said members during the rotational and lateral movement of said movable connector member.
  • the size of the openings in adjacent fluid passages in said movable and fixed connector members are both smaller than the diameter of said seal means surrounding said openings so that the seal between the connector members is maintained during lateral movement of said movable connector member relative to said fixed connector member.
  • said fixed connector member has a central pocket, with at least one of said fluid passages therein opening into said pocket;
  • said movable connector member has a connector arm rotatably mounted in said pocket and having at least one of said fluid passages therein opening into said fluid passage from said fixed connector member to establish fluid communication therebetween.
  • said fixed connector member has a central pocket, with a plurality of said fluid passages therein opening into said pocket;
  • said movable connector member has a connector arm rotatably mounted in said pocket and having a plurality of said fluid passages therein, each fluid passage in said fixed connector member opening into a fluid passage in said movable connector member.

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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)
  • Joints Allowing Movement (AREA)
  • Catching Or Destruction (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
US95155A 1970-12-04 1970-12-04 Swinging blowout preventer head with fluid connector Expired - Lifetime US3658287A (en)

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US9515570A 1970-12-04 1970-12-04

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US (1) US3658287A (fr)
JP (1) JPS5521206B1 (fr)
CA (1) CA957276A (fr)
FR (1) FR2116526B1 (fr)
GB (1) GB1333484A (fr)
NL (1) NL166520C (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253638A (en) * 1979-08-02 1981-03-03 Cameron Iron Works, Inc. Blowout preventer
US4372527A (en) * 1980-05-05 1983-02-08 Dresser Industries, Inc. Blowout preventer
WO1996021795A1 (fr) * 1995-01-13 1996-07-18 Hydril Company Bloc obturateur haute pression leger et compact
FR2757895A1 (fr) * 1996-12-27 1998-07-03 Varco Shaffer Inc Bloc obturateur de puits utile dans la recuperation d'hydrocarbures et son procede de mise en oeuvre
WO2002090708A1 (fr) * 2001-05-04 2002-11-14 Hydril Company Supports rotatifs pour opercules de blocs d'obturation
US20030085040A1 (en) * 2001-05-04 2003-05-08 Edward Hemphill Mounts for blowout preventer bonnets
US20050263291A1 (en) * 2001-05-04 2005-12-01 Gass Dustin D BOP conversion apparatus
US20060243451A1 (en) * 2001-05-04 2006-11-02 Hydril Company Lp Mounts for blowout preventer bonnets
US7699554B2 (en) 2003-06-03 2010-04-20 Hydril Usa Manufacturing Llc Removable seal carrier for blowout preventer bonnet assembly
US20110030943A1 (en) * 2009-08-05 2011-02-10 National Oilwell Varco, L.P. Portable Ram Block Changer
CN104895521A (zh) * 2015-05-13 2015-09-09 陕西福瑞德石油科技有限公司 煤层气井带压作业装备
US9732577B2 (en) * 2015-09-08 2017-08-15 Axon Pressure Products, Inc. Blowout preventer with hinged bonnet
US20190330955A1 (en) * 2018-04-25 2019-10-31 Kana Energy Services, Inc. Blowout preventer
US11441381B2 (en) * 2019-08-27 2022-09-13 Hydril USA Distribution LLC Blowout preventer system and method
US11459844B2 (en) * 2019-08-27 2022-10-04 Hydril USA Distribution LLC Blowout preventer system and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488703A (en) * 1983-02-18 1984-12-18 Marvin R. Jones Valve apparatus
JPS61174318U (fr) * 1985-04-18 1986-10-30

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833904A (en) * 1958-04-28 1960-05-04 Cameron Iron Works Inc Improvements relating to valve apparatus, particularly blowout preventers
US3272222A (en) * 1963-10-28 1966-09-13 Cameron Iron Works Inc Blowout preventer
US3561526A (en) * 1969-09-03 1971-02-09 Cameron Iron Works Inc Pipe shearing ram assembly for blowout preventer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833904A (en) * 1958-04-28 1960-05-04 Cameron Iron Works Inc Improvements relating to valve apparatus, particularly blowout preventers
US3272222A (en) * 1963-10-28 1966-09-13 Cameron Iron Works Inc Blowout preventer
US3561526A (en) * 1969-09-03 1971-02-09 Cameron Iron Works Inc Pipe shearing ram assembly for blowout preventer

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253638A (en) * 1979-08-02 1981-03-03 Cameron Iron Works, Inc. Blowout preventer
US4372527A (en) * 1980-05-05 1983-02-08 Dresser Industries, Inc. Blowout preventer
WO1996021795A1 (fr) * 1995-01-13 1996-07-18 Hydril Company Bloc obturateur haute pression leger et compact
US5642872A (en) * 1995-01-13 1997-07-01 Hydril Company Low profile and lightweight high pressure blowout preventer
US5645098A (en) * 1995-01-13 1997-07-08 Hydril Company Low profile and lightweight high pressure blowout preventer
FR2757895A1 (fr) * 1996-12-27 1998-07-03 Varco Shaffer Inc Bloc obturateur de puits utile dans la recuperation d'hydrocarbures et son procede de mise en oeuvre
US7281586B2 (en) 2001-05-04 2007-10-16 Hydril Company Mounts for blowout preventer bonnets
US7413019B2 (en) 2001-05-04 2008-08-19 Hydril Usa Manufacturing Llc Mounts for blowout preventer bonnets
US20030085040A1 (en) * 2001-05-04 2003-05-08 Edward Hemphill Mounts for blowout preventer bonnets
US20050263291A1 (en) * 2001-05-04 2005-12-01 Gass Dustin D BOP conversion apparatus
US20060162936A1 (en) * 2001-05-04 2006-07-27 Hydril Company Lp Mounts for blowout preventer bonnets
US7096960B2 (en) * 2001-05-04 2006-08-29 Hydrill Company Lp Mounts for blowout preventer bonnets
US7121348B2 (en) * 2001-05-04 2006-10-17 Hydril Company Lp Mounts for blowout preventer bonnets
US20060243451A1 (en) * 2001-05-04 2006-11-02 Hydril Company Lp Mounts for blowout preventer bonnets
US20060283602A1 (en) * 2001-05-04 2006-12-21 Hydril Company Lp Mounts for blowout preventer bonnets
CN1304725C (zh) * 2001-05-04 2007-03-14 海德尔公司 用于防喷装置罩盖的转动台和接近防喷装置罩盖中的闸板的方法
US20070102656A1 (en) * 2001-05-04 2007-05-10 Edward Hemphill Mounts for blowout preventer bonnets
US7246666B2 (en) * 2001-05-04 2007-07-24 Hydril Company Lp Mounts for blowout preventer bonnets
WO2002090708A1 (fr) * 2001-05-04 2002-11-14 Hydril Company Supports rotatifs pour opercules de blocs d'obturation
US7357187B2 (en) 2001-05-04 2008-04-15 Hydril Company Lp BOP conversion apparatus
US20080142746A1 (en) * 2001-05-04 2008-06-19 Hydril Company Llc Mounts for blowout preventer bonnets
US6510897B2 (en) * 2001-05-04 2003-01-28 Hydril Company Rotational mounts for blowout preventer bonnets
US8230930B2 (en) 2001-05-04 2012-07-31 Hydril Usa Manufacturing Llc Mounts for blowout preventer bonnets and methods of use
US7802626B2 (en) 2001-05-04 2010-09-28 Hydril Usa Manufacturing Llc Mounts for blowout preventer bonnets and methods of use
US20110005743A1 (en) * 2001-05-04 2011-01-13 Hydril Company Llc Mounts for Blowout Preventer Bonnets and Methods of Use
US7699554B2 (en) 2003-06-03 2010-04-20 Hydril Usa Manufacturing Llc Removable seal carrier for blowout preventer bonnet assembly
US20110030943A1 (en) * 2009-08-05 2011-02-10 National Oilwell Varco, L.P. Portable Ram Block Changer
US8720476B2 (en) * 2009-08-05 2014-05-13 National Oilwell Varco, L.P. Portable ram block changer
US20140209320A1 (en) * 2009-08-05 2014-07-31 National Oilwell Varco, L.P. Portable ram block changer
US9441442B2 (en) * 2009-08-05 2016-09-13 National Oilwell Varco, L.P. Portable ram block changer
CN104895521A (zh) * 2015-05-13 2015-09-09 陕西福瑞德石油科技有限公司 煤层气井带压作业装备
CN104895521B (zh) * 2015-05-13 2016-04-27 陕西福瑞德石油科技有限公司 煤层气井带压作业装备
US9732577B2 (en) * 2015-09-08 2017-08-15 Axon Pressure Products, Inc. Blowout preventer with hinged bonnet
US20190330955A1 (en) * 2018-04-25 2019-10-31 Kana Energy Services, Inc. Blowout preventer
US11441381B2 (en) * 2019-08-27 2022-09-13 Hydril USA Distribution LLC Blowout preventer system and method
US11459844B2 (en) * 2019-08-27 2022-10-04 Hydril USA Distribution LLC Blowout preventer system and method

Also Published As

Publication number Publication date
FR2116526A1 (fr) 1972-07-13
JPS5521206B1 (fr) 1980-06-07
NL7116500A (fr) 1972-06-06
CA957276A (en) 1974-11-05
GB1333484A (en) 1973-10-10
DE2160123B2 (de) 1977-05-26
NL166520B (nl) 1981-03-16
NL166520C (nl) 1981-08-17
DE2160123A1 (de) 1972-06-08
FR2116526B1 (fr) 1976-06-04

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