US3902743A - Full opening wellhead with retractile seat - Google Patents

Full opening wellhead with retractile seat Download PDF

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Publication number
US3902743A
US3902743A US421292A US42129273A US3902743A US 3902743 A US3902743 A US 3902743A US 421292 A US421292 A US 421292A US 42129273 A US42129273 A US 42129273A US 3902743 A US3902743 A US 3902743A
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US
United States
Prior art keywords
ring
casing
bore
seat
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
Application number
US421292A
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English (en)
Inventor
Don L Martin
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.)
FMC Corp
Original Assignee
FMC Corp
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 FMC Corp filed Critical FMC Corp
Priority to US421292A priority Critical patent/US3902743A/en
Priority to NO742517A priority patent/NO742517L/no
Priority to GB4385774A priority patent/GB1453008A/en
Priority to CA211,778A priority patent/CA1015657A/en
Application granted granted Critical
Publication of US3902743A publication Critical patent/US3902743A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • 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

Definitions

  • the seat is inherently biased'towards its contracted [56] References cued condition wherein it extends into the heads bore in UNITED STATES PATENTS functional position, and is retracted from the bore into 239.827 4/1881 Newman 285/308 an annular recess in the head by rotation of a cam ele- 2 2315 2/ 1883 Peasc 285/314 X ment located between the opposed ends of the seat L5 l9 l l 1 12/1924 Browncll. 285/91 Where i i li 1,857.528 5/l932 Camel] 285/314 X 2.901269 8/1959 Rickard 285/308 X 3.405.956 10/1968 Pierce Jr.
  • Another solution to this problem involves starting with a larger casing head than ultimately required, thereby providing the needed clearance for the oversize bits. and then later changing to a smaller casing head and blowout preventer stack.
  • This solution also has drawbacks. chiefly in the loss of valuable time that is required to accomplish the change of easing head and preventers.
  • a variety of easing heads have been devised with arcuate segments that are extended inwardly from a retracted position in a recess in the casing head bore to present a plurality of seating surfaces resembling an annular shoulder.
  • the hanger support surface presented by these devices is sometimes limited in size, and the segments themselves receive only limited support from the wall of the casing head.
  • the segments in some of these heads have a tendency to jam in their retracted position from mud and cuttings that fill the recess in which they reside.
  • Some of the aforementioned casing heads have seat segments actuated by hydraulic or pneumatic pistons that occupy significant space around the head. and at least one head has a plurality of actuator screws around its periphery for moving the segments between their retracted and extended positions. Where several wellheads are tightly clustered in a small area such as on an offshore platform, access to each head can be so limited as to present a serious problem in positioning the actuator pistons, or in providing suffieient space around the head to operate each of the actuator screws.
  • the present invention overcomes the foregoing problems by providing a well casing head with a separate, retractile, split-ring seat element that is self-contracting into a functional position, and is retracted therefrom by a cam element operated from a single location outside the head.
  • the seat ring In its retracted position the seat ring is in expanded condition and resides in an annular groove or recess in the bore of the head, with its internal diameter at least as great as the bores diameter so that it presents no obstruction to the passing of maximum size well tools through the head.
  • this seat ring is in contracted condition, extending into the head bore to provide an essentially full circle seating surface for firmly and properly supporting a casing hanger or other device in the head.
  • the cam element is located between the opposed ends of the seat ring, i.e., within the split, and is shaped so that in one position it holds the seat ring expanded and in its other position the seat ring is contracted.
  • the cam element is fixed to the inner end of a shaft that extends laterally through the wall of the head, and suitable means on the outer end of the shaft facilitates rotating it, and thus also the cam, about an arc of approximately between the cams two positions.
  • an object of the present invention is to provide a new and improved type of full opening, through bore well casing head apparatus.
  • Another object of the present invention is to provide a new type of retractile seat mechanism for a well casing head. which seat mechanism when retracted will provide a straight, unobstructed bore through the head to permit passage of maximum diameter well tools.
  • Yet another object of the present invention is to provide an improved seat mechanism for use in a wellhead that does not have to be changed during drilling and pipe hanging operations.
  • Still another object of the present invention is to provide an improved type of reetractile well head seat mechanism that can be extended and retracted from a single location outside the head.
  • FIG. 1 is an isometric view, partially broken away, of a retractile seat and full opening wcll casing head assembly according to the present invention, showing the seat in its extended, functional position.
  • FIG. 2 is a horizontal section of the casing head assembly of FIG. 1, taken along the line 22 of FIG. I, and with parts removed.
  • FIG. 3 is an isometric view of the retractile seat of the casing head of FIG. 1.
  • FIG. 4 is a fragmentary view in vertical section of the casing head of FIG. 1, showing the position of the retractile seat in the head when in extended, functional, casing hanger-supporting position.
  • FIG. 5 is a view like FIG. 4, but showing the retractile seat in its retracted position.
  • FIG. 6 is a fragmentary isometric view of the casing head of this invention, showing the retractile seat in its contracted condition, and with parts broken away to better illustrate the cam mechanism for retracting the seat.
  • FIG. 7 is a fragmentary view in side elevation of the exterior components of the cam mechanism, taken in the direction of the arrow 7 in FIG. 6.
  • FIG. 8 is a view like FIG. 6, but with the seat in its expanded condition.
  • FIG. 9 is a view like FIG. 7, but taken in the direction of the arrow 9 in FIG. 8.
  • the present invention comprises a full opening well casing head 10, a retractile split-ring type seat element 12, and a cam mechanism 14 mounted for rotation in the head 10 to expand the seat 12 from its extended, functional position in the casing head as illustrated in FIGS. l4, 6 and 7, into its retracted position as shown in FIGS. 5, 8 and 9.
  • the casing head 10 which is fixed to and supported by an outermost or surface casing 16 when properly installed at a well site, is comprised of lower or downhole section 18 and upper section 20, respectively, that are threaded together at 22. Bores 24, 26 through the sections 18, are equal in diameter, so that when these sections are assembled an unobstructed, straightthrough bore 27 is formed in the casing head 10 through the upper access opening of section 20 and lower downhole section 18 communicating with surface casing 16.
  • the lower section 18 of the casing head 10 is counterbored at 28, and has a radial surface 30 extending between the bore 24 and this counterbore.
  • the lower end of the'casing heads upper section 20 has a radial surface 32 that extends inwardly from the external threads 34 to an annular, downward-extending axial surface 36 (FIGS. 4 and 5) of short dimension, and a conical surface 38 extends upwardly and inwardly from the axial surface 36 to the upper scctions bore 26.
  • the seat element 12 is of split-ring configuration and has opposed ends 44, 46 with inner portions beveled at 44a, 46a.
  • the inner and outer annular surfaces 48, 50 of the seat 12 are cylindrical, with the outer surface 50 interrupted by a plurality of circumferentially spaced axial grooves 52 that have a depth of approximately one-half the radial thickness of the seat. These grooves 52 enhance the radial flexibility of the seat 12 without impairing the strength of the seat that is needed to adequately perform the function of a casing hanger support.
  • the bottom surface 54 of the seat 12 is planar, and rests securely on the radial, and also planar, surface 30 of the casing heads annular recess 42. As shown in FIG. 4, substantially all of the seat's bottom surface 54 is in contact with the recess surface 30 when the seat is extended in functional position into the casing head bore 27, thereby providing a bearing area adequate for transferring all loads that might be encountered to the casing head 10.
  • the top surface 56 of the split-ring type seat 12 has a radial, planar central portion 58, an inner, upwardly inclined conical portion 60, and an outer axial flange portion 62.
  • the inner portion 60 of the seats top surface functions as a support for a casing hanger, such as that represented by the element 64 in FIGS. 1 and 4, and because this annular surface 60 is broken only by the split in the seat it is essentially continuous and thus provides maximum bearing area for the hanger 64.
  • This conical surface 60 also serves in self-centerin g the seat 12 when the hanger 64 is landed upon it.
  • the axial flange 62 functions to retain the seat 12 in the recess 42 by cooperatively engaging the annular, axial surface 36 of the casing head s upper section 20, as can be seen in FIG. 4.
  • the lower end of the scats inner surface 48 is beveled to provide a conical surface 66, and this surface functions as a cam to expand the seat upon application of an upward axial force against it. Accordingly, if the seat I2 should be extended into the casing head bore prematurely, well tools of maximum diameter can still be pulled up through the seat, causing it to expand and then contract as the tools pass through it.
  • the cam mechanism 14 for expanding the seat 12 into its retracted position in the recess 42 i.e. the position shown in FIGS. 5, 8 and 9, comprises a cam element disposed between the opposed ends 44, 46 in the split in the seat 12, and a cylindrical cam shaft 72 fixed to the cam 70 and rotatably extending through a port 74 in the side wall of the casing head 10.
  • the cam shaft 72 has an inner radial flange 76 that is received in a counterbore 78 in the casing heads side wall, and an annular packing 80 in the counterbore 78 serves as an inner fluid seal for the shaft 72.
  • the outer portion of the shaft 72 extends through an annular retainer element 82 that is secured to the outside of the casing head 10 by a plurality of cap screws 84, and this retainer 82 has a pair of arcuate lugs 86, 88 (FIGS. 2, 7 and 9) that extend axially beyond its outer annular end surface 90.
  • the cam shaft 72 has a pair of intersecting, diametrical transverse bores 92, 94 axially located between the retainer surface 90 and the ends of the lugs 86, 88, the bore 92 serving to retain two cylindrical pins 96, 98 protruding radially from the cam shaft, and the bore 94 functioning to accept a cotter key 100.
  • the cam 70 is generally elongate in shape, having a longitudinal axis A (FIGS. 6 and 8) that is disposed vertically when the seat 12 is in its contracted, extended position (FIGS, 1, 2, 6 and 7). and disposed at an inclined position (FIGS. 8 and 9) approximately degrees of rotation from the vertical when the seat 12 is fully retracted into the recess 42.
  • the cam 70 has appropriately contoured opposite side surfaces 106, 108 that bear against the seats opposed ends 44, 46, re-
  • Rotation of the cam 70 is facilitated by a wrench or other manual tool in cooperation with a square or other suitably shaped outer end 114 of the cam shaft 72.
  • the lugs 86, 88 are dimensioned so that their faces 116, 118 constitute stops that cooperate with the cam shaft pins 96, 98 to halt further rotationof the shaft and cam clockwise. as viewed from outside the casing head and properly position the cam so that the seat 12 is fully expanded.
  • faces 120, 122 of the lugs 86, 88 in cooperation with the pins 98, 96, respectively. preclude further counter-clockwise rotation of the cam 70 past its vertical position wherein the seat 12 is fully contracted into its functional, extended position (FIGS. 1, 2, 4, 6 and 7).
  • FIG. 1 As best seen in FIG.
  • the cam 70 can be releasably locked in its seat retracted position by installation of the cotter key 100 through the cam shafts transverse bore 94, thereby preventing counterclockwise rotation of the cam until the cotter key is removed.
  • the operator can be assured that the seat 12 is fully retracted into the recess 42 to provide a full open wellhead, and will remain in that position, when the cotter key is in place as indicated in FIG. 9.
  • annular packing 80 provides an internal seal between the cam shaft 72 and the lateral port 74 through the wall of the casing head 10, to preclude fluid leakage through the head in this area.
  • An external annular camshaft packing 130 (FIGS. 1, 2, 6 and 8) also is provided in anexternal counterbore 132 in the outer surface of the head 12, this packing being held in place by the annular retainer 82. Accordingly, fluid-tight integrity between the cam shaft 72 and the casing head 10 is assured at 'both the internal and external ends of the port 74.
  • theabove described invention provides a significant improvement in retractile seat, full opening wellheads, all in a device that is less complex. more compact, and considerably less time-consuming to operate,'than any of the wellheads of the general type heretofore available.
  • Structural strength of a very high order is provided by the unique seat element 12, and ease plus surety of expansion and contraction thereof are guaranteed by the cam mechanism 14.
  • a well casing hanger apparatus for supporting a string of casing in an oil or gas well, said apparatus including a casing head having an upper end portion providing an access opening to a bore therethrough, a lower end portion having a downhole opening to said bore, and means disposed in said casing head between said access and downhole openings for providing a seat for a casing hanger introduced through said access opening to prevent its continued passage through said bore to said downhole opening, thereby to support a said casing hanger in said casing head, the improvement comprising:
  • said casing head bore being defined substantially by cylindrical walls thereby being full-opening and unobstructed therethrough to allow ready passage of well tools introduced through said access opening back and forth through said bore and said downhole opening,
  • said casing hanger seat means comprising a normally contractile resilient split ring seated on said surface and having opposed ends defining said split
  • said ring having a contracted inner diameter at the end thereof facing said casing head access opening less than the diameter of said bore and an outer diameter substantially greater than said bore thereby to support said ring on said recess surface when supporting a casing hanger in said casing head,
  • said ring end facing said access opening having a bore-obstructing abutment surface thereon configured to preclude radially outward camming forces thereon by a casing hanger introduced through said access opening thereby to abuttingly engage and support said casing hanger,
  • said expanding means comprising a cam disposed between said ring ends and movable between a first position permitting contraction of said ring and a second position expanding said ring, and
  • a well casing hanger apparatus according to claim 1, wherein said seat ring abutment surface is frustoconical, sloping downwardly and outwardly, for centering said ring in said casing head when a casing hanger having an upwardly and inwardly sloping frusto-conical surface thereon is landed thereupon, said ring surface providing a secure support for said casing hanger, said secure support thereby being non-releasable by radial expansion so long as said casing hanger rests on said frusto-conical surface.
  • a well casing hanger apparatus according to claim 1, wherein said seat element ring includes stop means cooperable with abutment means in said casing head annular recess to prevent excessive contraction of said ring.
  • a well casing hanger apparatus according to claim 1, wherein the inside surface of said seat ring is beveled at its edge facing said bore downhole opening, thereby forming a frusto-conical surface for camming said seat ring towards its expanded condition in response to the application of an axial force thereto by an abutment flange of an inserted well tool disposed between said ring and said downhole opening.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
US421292A 1973-12-03 1973-12-03 Full opening wellhead with retractile seat Expired - Lifetime US3902743A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US421292A US3902743A (en) 1973-12-03 1973-12-03 Full opening wellhead with retractile seat
NO742517A NO742517L (enrdf_load_stackoverflow) 1973-12-03 1974-07-10
GB4385774A GB1453008A (en) 1973-12-03 1974-10-10 Well-head assemblies
CA211,778A CA1015657A (en) 1973-12-03 1974-10-18 Full opening wellhead with retractile seat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US421292A US3902743A (en) 1973-12-03 1973-12-03 Full opening wellhead with retractile seat

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US3902743A true US3902743A (en) 1975-09-02

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US421292A Expired - Lifetime US3902743A (en) 1973-12-03 1973-12-03 Full opening wellhead with retractile seat

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US (1) US3902743A (enrdf_load_stackoverflow)
CA (1) CA1015657A (enrdf_load_stackoverflow)
GB (1) GB1453008A (enrdf_load_stackoverflow)
NO (1) NO742517L (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835274A1 (de) * 1977-08-12 1979-02-22 Victaulic Co Of America Kupplung
FR2510702A1 (fr) * 1981-08-03 1983-02-04 Smith International Bague et dispositif d'etancheite en metal pour tete de puits, et ensemble de puits
US4597448A (en) * 1982-02-16 1986-07-01 Smith International, Inc. Subsea wellhead system
US4653778A (en) * 1985-06-17 1987-03-31 Vetco Gray Inc Lockdown connector for mudline wellhead tieback adaptor
US4826216A (en) * 1988-04-28 1989-05-02 Cameron Iron Works Usa, Inc. Well housing and landing shoulder
US4886121A (en) * 1988-02-29 1989-12-12 Seaboard-Arval Corporation Universal flexbowl wellhead and well completion method
US5327972A (en) * 1992-09-25 1994-07-12 Cooper Industries, Inc. Wellhead system
US5794988A (en) * 1996-12-16 1998-08-18 Gill; Ajit Singh Grip coupling
WO2000009935A1 (en) * 1996-12-16 2000-02-24 Ajit Singh Gill Grip coupling
US6186560B1 (en) * 1997-12-25 2001-02-13 Ajit Singh Gill Single bolt coupling
US6666272B2 (en) * 2002-02-04 2003-12-23 Fmc Technologies, Inc. Externally actuated subsea wellhead tieback connector
US20080245534A1 (en) * 2005-02-04 2008-10-09 Petrowell Limited Wellhead Assembly and Method
NL2001262C2 (nl) * 2008-02-07 2009-08-10 Wavin Bv Trekvaste koppeling.
US20110036589A1 (en) * 2009-08-17 2011-02-17 Stream-Flo Industries Ltd. Wellhead connection
US20110095526A1 (en) * 2009-10-26 2011-04-28 Cameron International Corporation Wellhead tubular connector
WO2012047739A1 (en) * 2010-10-05 2012-04-12 The Subsea Company Pipe connector
US8997849B2 (en) 2011-08-02 2015-04-07 Plainsman Manufacturing Inc. Isolated shearing mechanism for downhole tools
USD958304S1 (en) * 2021-03-02 2022-07-19 Bridgeport Fittings, Llc Liquid tight non-metallic connector

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US239827A (en) * 1881-04-05 Hose-coupling
US272315A (en) * 1883-02-13 Tube-coupling
US1519111A (en) * 1923-06-04 1924-12-16 Diamond Metal Products Co Pipe coupling
US1857528A (en) * 1931-11-13 1932-05-10 John F Cantell Coupling
US2901269A (en) * 1957-01-31 1959-08-25 Mcdowell Mfg Co Split ring coupling
US3405956A (en) * 1966-03-22 1968-10-15 Gray Tool Co Apparatus for mechanically keying parts to one another
US3434745A (en) * 1967-04-13 1969-03-25 Smith Corp A O Pipe coupling having a split ring locking means
US3606393A (en) * 1969-09-05 1971-09-20 Vetco Offshore Ind Inc Pipe connectors
US3664689A (en) * 1969-08-14 1972-05-23 Vetco Offshore Ind Inc Selectively lockable casing hanger

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US239827A (en) * 1881-04-05 Hose-coupling
US272315A (en) * 1883-02-13 Tube-coupling
US1519111A (en) * 1923-06-04 1924-12-16 Diamond Metal Products Co Pipe coupling
US1857528A (en) * 1931-11-13 1932-05-10 John F Cantell Coupling
US2901269A (en) * 1957-01-31 1959-08-25 Mcdowell Mfg Co Split ring coupling
US3405956A (en) * 1966-03-22 1968-10-15 Gray Tool Co Apparatus for mechanically keying parts to one another
US3434745A (en) * 1967-04-13 1969-03-25 Smith Corp A O Pipe coupling having a split ring locking means
US3664689A (en) * 1969-08-14 1972-05-23 Vetco Offshore Ind Inc Selectively lockable casing hanger
US3606393A (en) * 1969-09-05 1971-09-20 Vetco Offshore Ind Inc Pipe connectors

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835274A1 (de) * 1977-08-12 1979-02-22 Victaulic Co Of America Kupplung
FR2400134A1 (fr) * 1977-08-12 1979-03-09 Victaulic Co Of America Accouplement
US4165892A (en) * 1977-08-12 1979-08-28 Victaulic Company Of America Coupling for releasably securing one end of a rod-like member
FR2510702A1 (fr) * 1981-08-03 1983-02-04 Smith International Bague et dispositif d'etancheite en metal pour tete de puits, et ensemble de puits
US4597448A (en) * 1982-02-16 1986-07-01 Smith International, Inc. Subsea wellhead system
US4615544A (en) * 1982-02-16 1986-10-07 Smith International, Inc. Subsea wellhead system
US4653778A (en) * 1985-06-17 1987-03-31 Vetco Gray Inc Lockdown connector for mudline wellhead tieback adaptor
US4886121A (en) * 1988-02-29 1989-12-12 Seaboard-Arval Corporation Universal flexbowl wellhead and well completion method
US4826216A (en) * 1988-04-28 1989-05-02 Cameron Iron Works Usa, Inc. Well housing and landing shoulder
EP0340365A3 (en) * 1988-04-28 1990-06-20 Cameron Iron Works Usa, Inc. (A Delaware Corp.) Well housing and landing shoulder
WO1990006419A1 (en) * 1988-12-05 1990-06-14 Seaboard-Arval Corporation Universal flexbowl wellhead and well completion method
US5327972A (en) * 1992-09-25 1994-07-12 Cooper Industries, Inc. Wellhead system
US5794988A (en) * 1996-12-16 1998-08-18 Gill; Ajit Singh Grip coupling
WO2000009935A1 (en) * 1996-12-16 2000-02-24 Ajit Singh Gill Grip coupling
US6186560B1 (en) * 1997-12-25 2001-02-13 Ajit Singh Gill Single bolt coupling
US6666272B2 (en) * 2002-02-04 2003-12-23 Fmc Technologies, Inc. Externally actuated subsea wellhead tieback connector
US20080245534A1 (en) * 2005-02-04 2008-10-09 Petrowell Limited Wellhead Assembly and Method
US7798208B2 (en) * 2005-02-04 2010-09-21 Petrowell Limited Wellhead assembly and method
NL2001262C2 (nl) * 2008-02-07 2009-08-10 Wavin Bv Trekvaste koppeling.
EP2088359A1 (en) * 2008-02-07 2009-08-12 Wavin B.V. Tensile resistant coupler
US20110036589A1 (en) * 2009-08-17 2011-02-17 Stream-Flo Industries Ltd. Wellhead connection
WO2011020182A1 (en) * 2009-08-17 2011-02-24 Stream-Flo Industries Ltd. Wellhead connection
US8403057B2 (en) 2009-08-17 2013-03-26 Stream-Flo Industries Ltd. Wellhead connection
GB2488448A (en) * 2009-10-26 2012-08-29 Cameron Int Corp Wellhead tubular connector
WO2011056308A1 (en) * 2009-10-26 2011-05-12 Cameron International Corporation Wellhead tubular connector
US8347970B2 (en) 2009-10-26 2013-01-08 Cameron International Corporation Wellhead tubular connector
US20110095526A1 (en) * 2009-10-26 2011-04-28 Cameron International Corporation Wellhead tubular connector
GB2488448B (en) * 2009-10-26 2014-12-31 Cameron Int Corp Wellhead tubular connector
US8960274B2 (en) 2009-10-26 2015-02-24 Cameron International Corporation Wellhead tubular connector
US9765582B2 (en) 2009-10-26 2017-09-19 Cameron International Corporation Wellhead tubular connector
WO2012047739A1 (en) * 2010-10-05 2012-04-12 The Subsea Company Pipe connector
US9366093B2 (en) * 2010-10-05 2016-06-14 The Subsea Company Pipe connector
US8997849B2 (en) 2011-08-02 2015-04-07 Plainsman Manufacturing Inc. Isolated shearing mechanism for downhole tools
US9663999B2 (en) 2011-08-02 2017-05-30 Plainsman Manufacturing Inc. Isolated shearing mechanism for downhole tools
USD958304S1 (en) * 2021-03-02 2022-07-19 Bridgeport Fittings, Llc Liquid tight non-metallic connector

Also Published As

Publication number Publication date
NO742517L (enrdf_load_stackoverflow) 1975-06-30
GB1453008A (en) 1976-10-20
CA1015657A (en) 1977-08-16

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