US3667721A - Blowout preventer - Google Patents

Blowout preventer Download PDF

Info

Publication number
US3667721A
US3667721A US27947A US3667721DA US3667721A US 3667721 A US3667721 A US 3667721A US 27947 A US27947 A US 27947A US 3667721D A US3667721D A US 3667721DA US 3667721 A US3667721 A US 3667721A
Authority
US
United States
Prior art keywords
packing element
housing
curved
sealing means
piston
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
US27947A
Inventor
Ado N Vujasinovic
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.)
Rucker Co
Original Assignee
Rucker Co
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 Rucker Co filed Critical Rucker Co
Application granted granted Critical
Publication of US3667721A publication Critical patent/US3667721A/en
Assigned to BAROID TECHNOLOGY, INC., 3000 NORTH SAM HOUSTON PARKWAY EAST A CORP. OF DE reassignment BAROID TECHNOLOGY, INC., 3000 NORTH SAM HOUSTON PARKWAY EAST A CORP. OF DE ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE Assignors: RUCKER COMPANY, THE
Assigned to CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), THE reassignment CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAROID CORPORATION, A CORP. OF DE.
Anticipated expiration legal-status Critical
Assigned to BAROID CORPORATION reassignment BAROID CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CHASE MANHATTAN BANK, THE
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • 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
    • E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • BACKGROUND OF THE INVENTION Pat. No. 3,323,773 generally describes a spherical blowout preventer having a resilient sealing means and metallic translating means for converting the axial movement of the actuating means into a rolling inward motion of the sealing means to completely seal the well hole with or without a drilling string therein.
  • the present invention is directed to various improvements to a blowout preventer such as providing a packing element which has no connection with the actuating piston thereby providing an easy replacement of a worn packing element, providing a blowout preventer with an improved closing characteristic, one which is self-opening, and an improved packing element which provides an improved sealing action and stripping performance and in which the translating means does not interfere with the sealed-olf objects when these are vertically moved through the closed packing element.
  • the present invention is directed to an improved blowout preventer one feature of which is providing a housing with a curved inner surface, preferably spherical, extending to a receiving port in which the resilient sealing means and metallic translating means slidably cooperate with the curved inner surface of the housing to move into a sealing position in which the translating means has an outer curved surface mating with the curved inner surface of the housing but of an axial extent less than the curved outer surface of the packing element and the resilient sealing means circumferentially extends below said outer curved surface of the translating means and contacts the curved inner surface of the housing to form a circumferential seal to provide an improved sealing action and to provide an improved closing characteristic especially on subsea applications.
  • a further object of the present invention is the provision of an annular space between the outer circumference of the lower portion of the sealing means and the housing in a spherical blowout preventer and outside of the actuating piston whereby the annular space increases in size as the seal is moved to a closing position thereby avoiding a lluid trap.
  • a further object of the present invention is the provision of a resilient sealing means bonded to a plurality of radially spaced metallic translating segments to form a packing element in a spherical blowout preventer wherein the resilient sealing means includes on its exterior a recess between adjacent segments thereby preventing interference with the metal-to-metal action of the segments on the housing as the blowout preventer closes.
  • a further object of the present invention is the provision of a resilient sealing means bonded to a plurality of metallic translating means having a curved portion slidably cooperating with a curved inner surface of the housing of the blowout preventer in which the translating means and resilient sealing means of the packing element are positioned against but free of a connection to an actuating piston thereby providing a structure in which the packing element may be easily replaced and the piston does not restrict the movement of the seal and in which the lower end of the translating means are arcuate thereby providing a free rocking movement of the translating means on the piston during opening and closing of the blowout preventer.
  • the present invention is also directed to provide a blowout preventer with an improved stripping characteristie of the packing element by allowing the resilient seal to easily and flexibly adjust to changes in the conguration of the drilling string during stripping operations while still maintaining the desired seal, all with least possible damage to the packing element.
  • FIG. 1 is a diagrammatical view of a subsea drilling rig in which the blowout preventer of the present invention may be used,
  • FIG. 2 is an elevational view in cross section of the preferred embodiment of the present invention in the open and nonsealing position with a drilling string within the apparatus
  • FIG. 3 is a fragmentary elevational view, partly taken in cross section along the line 3 3 of FIG. 2,
  • FIG. 4 is an elevational view, in cross section, illustrating the blowout preventer of the present invention in an intermediate position closing around the drilling string
  • FIG. 4A is a fragmentary elevational view in cross section, illustrating the blowout preventer of the present invention in a closed position around the drilling string
  • FIG. 4B is a fragmentary elevational view, in cross section, illustrating the blowout preventer of the present invention in a closed position with no drilling string therein,
  • FIG. 5 is a fragmentary cross-sectional view taken along the line 5-5 of FIG. 2, and
  • FIG. 6 is an enlarged perspective view of the metallic translating segments of the packing element.
  • blowout preventer apparatus of the present invention is generally indicated by the reference numeral 10 and is shown in FIG. 1, for example only, as used in an offshore subsea drilling operation, although of course the present apparatus 10 may be used in all types of drilling rigs Whether they are underwater or not.
  • the rblowout preventer 10 may include a housing 12 including an upper portion 14 and a lower portion 16 which are releasably fastened together by a plurality of bolts 18.
  • the bolts 18 may be easily disassembled to remove the upper housing 14 for easily replacing the packing element which is generally indicated by the reference numeral 19.
  • Axially aligned well tool receiving ports 22 and 24 are provided in the upper housing 14 and the lower housing 16, respectively, for receiving a well tool or drilling string 16 adapted to be axially moved within the apparatus 10.
  • the housing 12 and preferably the upper housing 14 includes an enlarged cylindrical bore 28 which includes a curved inner surface 30, preferably spherical, extending from the port 22.
  • the packing element 19 includes a resilient sealing means 20 positioned within the enlarged cylindrical bore 28 and adapted to be selectively moved between nonsealing position as shown in FIG. 2 to a sealing position as shown in FIGS. 4A and 4B.
  • the sealing means 20 may include a continuous ring of resilient material such as natural or synthetic rubber.
  • the seal 20 includes an inner bore 32 and an outer surface 34 with the diameter of the inner bore 32 being approximately equal to the diameter of the bores 22 and 24 and the outer surface 34 including a curved portion.
  • the packing element 19 also includes a plurality of radially spaced translating means 36 which are provided for slidably cooperating with the curved inner housing surface 30 for converting axial movement of an actuating means such as piston 38 into a rolling inward motion of the sealing means 20 to provide a seal adjacent the well receiving port 22.
  • the translating means 36 are a plurality of radially spaced steel segments bonded to the resilient sealing ring 20.
  • Suitable actuating means are positioned in the bore 28 adjacent the lower end of the packing element 19 for applying an axial movement thereto for moving the sealing means 20 and translating means 36 toward the curved inner housing surface 30 to a closed position, and may include a piston 38.
  • a fluid actuating line 40 is provided through the lower housing 16 to the underside of the piston 38 having an actuating head 39 and may be connected to remotely controlled fluid sources and controls (not shown) for actuating the piston 38.
  • the metallic translating means 36 generally includes a base 42, a web 44 and a curved plate 46.
  • the outer surface 48 of the curved plate 46 is preferably a portion of a sphere and coacts with the curved inner surface 30 of the upper housing 14 to provide a low friction, metal-to-metal sliding surface during the inward closing action of the packing element 19. It is to be noted from FIGS. 2, 3, 4, 4A, 4B, 5 and 6, the metallic translating means 36 generally includes a base 42, a web 44 and a curved plate 46.
  • the outer surface 48 of the curved plate 46 is preferably a portion of a sphere and coacts with the curved inner surface 30 of the upper housing 14 to provide a low friction, metal-to-metal sliding surface during the inward closing action of the packing element 19. It is to be noted from FIGS.
  • the bases 42 of the translating means 36 translate the vertical motion of the piston 38 into the inward rolling motion of the whole packing element 19 by transmitting the piston force through the web 44 and the curved plates 46.
  • the translating means 36 and sealing means have no positive connection with the piston 38 but merely rest thereon thereby providing ease of replacement of the packing element 19 merely by removal of the upper housing 14 and replacement therein.
  • the bottom 52 of the base 42 of the translating means 36 is arcuately shaped, such as cylindrically, thus allowing for the rocking movement of the translating means 36 on the head 39 of the piston 38 during the closing and opening operation.
  • the improved stripping action of the packing element 19 results from the inward spherical motion of the translating means 36 and their location with reference to the sealing means 20.
  • a metal supported sealing is generated on the top side of the packing element 19.
  • the bottom side of the packing element 19 is free of rigid metal and since the packing element 19 is not connected to the piston 38 the bottom side of the sealing means 20 can seal and easily and flexibly adjust to changes in the configuration of the drilling string during stripping operations.
  • a plurality of spaced recesses 54 are positioned around the exterior 34 of the sealing means 20 and positioned above the circumferential seal 50 and lbetween the curved plates 46 of the translating means 36.
  • the resilient material does not flow between the plates 46 to become pinched off or interfere with the closing operations, but may ow inwardly between the vertical webs 44.
  • the packing element 19 has a self-opening capability.
  • the force resulting from the potential energy stored in the compressed resilient sealing means 20 exerts sufficient downward pressure on the piston 38 to provide a cornplete return of the packing element 19 into the open relaxed position of FIG. l after the control pressure in line 40 has been relieved.
  • a single hydraulic line 40 is required to actuate the piston 38 on land based operations.
  • two hydraulic lines are required in order to balance the forces which act on the piston 38 and result from the static lluid head in the control lines.
  • a sealing insert 56 (FIGS. 2, 4, 4A and 4B) carrying the seals 57a, 57b and 57C is provided. Seals 57a and 57b seal-olf the space above the piston and allow uid pressure to be applied on the back side of the piston 38 through a hydraulic line 58. Seal 57o prevents sea water from entering the housing 12.
  • the resilient sealing means 20 performs all of the internal sealing functions of the blowout preventer and thus the replacement of a worn-out packing element 19 does not require a disengagement or a replacement of any additional seal.
  • the sealing area 62 formed by the upper housing 14 and the circumferential seal 50 of the resilient seal 20 determines the balance of forces which results from the static fluid head of the drilling mud within a riser pipe and the static fluid head in both control lines.
  • the hydraulic balance of the submerged spherical blowout preventor 10 can best be seen from FIG. 2.
  • the forces acting on the piston 38 in the direction opposing closing are the head of the drilling mud acting on the area A, and the head of the control fluid in the control line 58 acting on the piston area B of the piston 38.
  • the force acting in the direction of closing the blowout preventer is the head of the control fluid in the control line 40 acting upon the area C of the piston 38.
  • annular space 64 between the packing element 19, the sealing insert 56 and the upper housing 14 exteriorly of the actuating head 39 of the piston 38 which increases in volume with progressive stroking of the piston 38 thus avoiding a uid trap therein which might otherwise break the sealing action along the area 62.
  • hydraulic fluid is introduced in the line 40 and applied against the area C of the piston 38 causing upward movement of the piston 38 against the metallic translating means 36 and the resilient sealing means 20 causing the curved plates 46 of the translating means 36 to slidably engage and move along the inner curved housing surface 30 and inwardly to translate the axial motion of the actuating means 38 into an inward rolling motion of the sealing means forcing the sealing means into a sealing position to completely seal off a well hole with or without a drill string 26.
  • the pressure in the line 40 is relieved and the spring force of the compressed resilient sealing element exerts suicient downward pressure on the piston 38 to provide a complete return of the packing element 19 into its open relaxed position.
  • the piston 38 may be retracted by application of fluid pressures through line 58 acting upon the area B of the piston.
  • the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as others inherent therein.
  • a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, a resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position, and translating means slidably cooperating with said curved inner surface of said housing and cooperating with said sealing means for converting axial movement of an actuating means into an inward motion of said sealing means, the improvement comprising,
  • said translating means including a plurality of radially spaced metallic segments
  • the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of sufficient dimension to prevent flow of the resilient material between the curved outer surface of adjacent segments to interfere with closing of same.
  • a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position, a plurality of curved metallic translating means slidably cooperating with said curved inner surface of said housing, axial movable actuating means in said housing for moving said translating means and said sealing means toward said curved inner surface of said housing, the improvement comprising,
  • said resilient sealing means circumferentially extending below said outer curved surface of the translating means to form a circumferential seal in contact with the inner surface of the housing which decreases the effective [fluid pressure area of the sealing means responsive to the ⁇ fluid pressure at the receiving port as the sealing means moves to the sealing position, said translating means having a base, and
  • said translating means including a plurality of radially spaced metallic segments
  • the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of suicient dimension to prevent dlow of the resilient material between the curved outer surface of adjacent segments to interifere with closing of same.
  • a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position and a plurality of radially spaced metallic translating means slidably cooperating with said curved inner surface of the housing and the sealing means for sealing, axially movable actuating means in the housing for moving the translating means and sealing means toward said curved inner surface to provide an inward motion of the sealing means, the improvement comprising,
  • said translating means including a base, a rib extending upward therefrom, and a curved plate having an outer surface for mating with the curved inner surface of said housing, said curved plate being spaced from the base and the extent of the curved plate being less than the extent of the curved outer surface of the sealing means and being less than. the extent of the curved inner surface of said housing, and said resilient sealing means circumferentially extending between the curved plate and the base and contacting the curved inner surface of the housing for forming a circumferential seal therewith which decreases the effective iiuid pressure area of the sealing means responsive to the fluid pressure of the receiving port as the sealing means moves to the sealing position.
  • the base includes an arcuate surface in contact with but disconnected from the said actuating means.
  • the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of sufficient' dimension to prevent ow of the resilient material between the curved outer surface of adjacent segments to interfere with closing of same.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Earth Drilling (AREA)
  • Sealing Devices (AREA)
  • Actuator (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

AN IMPROVED BLOWOUT PREVENTER IN WHICH A PACKING ELEMENT HAVING A RESILIENT SEALING MEANS AND A PLURALITY OF METALLIC TRANSLATING MEANS SLIDABLY MOVES AGAINST A CURVED INNER SURFACE OF A HOUSING FOR MOVING INTO A SEALED POSITION IN WHICH THE PACKING ELEMENT IS POSITIONED AGAINST BUT NOT CONNECTED TO AN ACTUATING PISTON FOR INCREASED SEALING PERFORMANCE, FREEDOM OF MOVEMENT, ASND FOR EASE OF REPLACEMENT AND IN WHICH THE AXIAL EXTENT OF THE CURVED PORTION OF THE TRANSLATING MEANS IS LESS THAN THE CURVED OUTER SURFACE OF THE PACKING ELEMENT WHEREBY THE SEALING MEANS MAY CIRCUMFERENTIALLY CONTACT THE CURVED INNER SURFACE OF THE HOUSING TO FORM A SEAL TO PROVIDE IN IMPROVED CLOSING CHARACTERISTIC, AND THE BASES OF THE TRANSLATING MEANS ARE FURTHER AWAY FROM THE BORE WHEREBY THE SEALING MEANS ON THE BOTTOM OF THE PACKING ELEMENT IS ONLY SLIGHTLY COMPRESSED ALLOWING A FAST RESPONSE AND QUICK ADJUSTMENT OF THE PACKING ELEMENT TO CHANGES IN DIAMETER AND CONFIGURATION OF MOVED-THROUGH COMPONENTS OF THE DRILLING STRING.

Description

June 6, i972 A, N. vuJAslNovlc 3,667,721
BLOWOUT PREVENTER Filed April 13, 1970 3 Sheets-Sheet 1 BY (www iM/ June 6, 1972 Filed April 15, 1970 A. N. VUJASINOVIC BLOWOUT PREVENTER 3 Sheets-Sheet 2 A. N. vUJAslNovlc 3,667,721
.lune 6, 1972 BLOWOUT PREVENTER Filed April 13, 1970 3 Sheets-Sheet 3 nl Wma/' United States Patent Oice 3,667,721 Patented June 6, 1972 3,667,721 BLOWOUT PREVENTER Ado N. Vujasnovic, Fullerton, Calif., assignor to The Rucker Company, Oakland, Calif. Filed Apr. 13, 1970, Ser. No. 27,947 Int. Cl. E21b 33/06' U.S. Cl. 251-1 8 Claims ABSTRACT F THE DISCLOSURE An improved blowout preventer in which a packing element having a resilient sealing means and a plurality of metallic translating means slidably moves against a curved inner surface of a housing for moving into a sealed position in which the packing element is positioned against but not connected to an actuating piston for increased sealing performance, freedom of movement, and for ease of replacement and in which the axial extent of the curved portion of the translating means is less than the curved outer surface of the packing element whereby the sealing means may circumferentially contact the curved inner surface of the housing to form a seal to provide an improved closing characteristic, and the bases of the translating means are further away from the bore whereby the sealing means on the bottom of the packing element is only slightly compressed allowing a fast response and quick adjustment of the packing element to changes in diameter and configuration of moved-through components of the drilling string.
BACKGROUND OF THE INVENTION Pat. No. 3,323,773 generally describes a spherical blowout preventer having a resilient sealing means and metallic translating means for converting the axial movement of the actuating means into a rolling inward motion of the sealing means to completely seal the well hole with or without a drilling string therein. The present invention is directed to various improvements to a blowout preventer such as providing a packing element which has no connection with the actuating piston thereby providing an easy replacement of a worn packing element, providing a blowout preventer with an improved closing characteristic, one which is self-opening, and an improved packing element which provides an improved sealing action and stripping performance and in which the translating means does not interfere with the sealed-olf objects when these are vertically moved through the closed packing element.
SUMMARY The present invention is directed to an improved blowout preventer one feature of which is providing a housing with a curved inner surface, preferably spherical, extending to a receiving port in which the resilient sealing means and metallic translating means slidably cooperate with the curved inner surface of the housing to move into a sealing position in which the translating means has an outer curved surface mating with the curved inner surface of the housing but of an axial extent less than the curved outer surface of the packing element and the resilient sealing means circumferentially extends below said outer curved surface of the translating means and contacts the curved inner surface of the housing to form a circumferential seal to provide an improved sealing action and to provide an improved closing characteristic especially on subsea applications.
In connection with the improved closing characteristic, a further object of the present invention is the provision of an annular space between the outer circumference of the lower portion of the sealing means and the housing in a spherical blowout preventer and outside of the actuating piston whereby the annular space increases in size as the seal is moved to a closing position thereby avoiding a lluid trap.
A further object of the present invention is the provision of a resilient sealing means bonded to a plurality of radially spaced metallic translating segments to form a packing element in a spherical blowout preventer wherein the resilient sealing means includes on its exterior a recess between adjacent segments thereby preventing interference with the metal-to-metal action of the segments on the housing as the blowout preventer closes.
A further object of the present invention is the provision of a resilient sealing means bonded to a plurality of metallic translating means having a curved portion slidably cooperating with a curved inner surface of the housing of the blowout preventer in which the translating means and resilient sealing means of the packing element are positioned against but free of a connection to an actuating piston thereby providing a structure in which the packing element may be easily replaced and the piston does not restrict the movement of the seal and in which the lower end of the translating means are arcuate thereby providing a free rocking movement of the translating means on the piston during opening and closing of the blowout preventer.
The present invention is also directed to provide a blowout preventer with an improved stripping characteristie of the packing element by allowing the resilient seal to easily and flexibly adjust to changes in the conguration of the drilling string during stripping operations while still maintaining the desired seal, all with least possible damage to the packing element.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatical view of a subsea drilling rig in which the blowout preventer of the present invention may be used,
FIG. 2 is an elevational view in cross section of the preferred embodiment of the present invention in the open and nonsealing position with a drilling string within the apparatus,
FIG. 3 is a fragmentary elevational view, partly taken in cross section along the line 3 3 of FIG. 2,
FIG. 4 is an elevational view, in cross section, illustrating the blowout preventer of the present invention in an intermediate position closing around the drilling string,
FIG. 4A is a fragmentary elevational view in cross section, illustrating the blowout preventer of the present invention in a closed position around the drilling string,
FIG. 4B is a fragmentary elevational view, in cross section, illustrating the blowout preventer of the present invention in a closed position with no drilling string therein,
FIG. 5 is a fragmentary cross-sectional view taken along the line 5-5 of FIG. 2, and
FIG. 6 is an enlarged perspective view of the metallic translating segments of the packing element.
DESCRIPTION OF THE PREFERRED EMBODIMENT The blowout preventer apparatus of the present invention is generally indicated by the reference numeral 10 and is shown in FIG. 1, for example only, as used in an offshore subsea drilling operation, although of course the present apparatus 10 may be used in all types of drilling rigs Whether they are underwater or not.
The rblowout preventer 10, as best seen in FIG. 2, may include a housing 12 including an upper portion 14 and a lower portion 16 which are releasably fastened together by a plurality of bolts 18. The bolts 18 may be easily disassembled to remove the upper housing 14 for easily replacing the packing element which is generally indicated by the reference numeral 19.
Axially aligned well tool receiving ports 22 and 24 are provided in the upper housing 14 and the lower housing 16, respectively, for receiving a well tool or drilling string 16 adapted to be axially moved within the apparatus 10. The housing 12 and preferably the upper housing 14 includes an enlarged cylindrical bore 28 which includes a curved inner surface 30, preferably spherical, extending from the port 22.
The packing element 19 includes a resilient sealing means 20 positioned within the enlarged cylindrical bore 28 and adapted to be selectively moved between nonsealing position as shown in FIG. 2 to a sealing position as shown in FIGS. 4A and 4B. The sealing means 20 may include a continuous ring of resilient material such as natural or synthetic rubber. The seal 20 includes an inner bore 32 and an outer surface 34 with the diameter of the inner bore 32 being approximately equal to the diameter of the bores 22 and 24 and the outer surface 34 including a curved portion.
The packing element 19 also includes a plurality of radially spaced translating means 36 which are provided for slidably cooperating with the curved inner housing surface 30 for converting axial movement of an actuating means such as piston 38 into a rolling inward motion of the sealing means 20 to provide a seal adjacent the well receiving port 22. Preferably, the translating means 36 are a plurality of radially spaced steel segments bonded to the resilient sealing ring 20.
Suitable actuating means are positioned in the bore 28 adjacent the lower end of the packing element 19 for applying an axial movement thereto for moving the sealing means 20 and translating means 36 toward the curved inner housing surface 30 to a closed position, and may include a piston 38. A fluid actuating line 40 is provided through the lower housing 16 to the underside of the piston 38 having an actuating head 39 and may be connected to remotely controlled fluid sources and controls (not shown) for actuating the piston 38.
Referring now to FIGS. 2, 3, 4, 4A, 4B, 5 and 6, the metallic translating means 36 generally includes a base 42, a web 44 and a curved plate 46. The outer surface 48 of the curved plate 46 is preferably a portion of a sphere and coacts with the curved inner surface 30 of the upper housing 14 to provide a low friction, metal-to-metal sliding surface during the inward closing action of the packing element 19. It is to be noted from FIGS. 2, 4, 4A and 4B that the curved plate 46 does not extend continuously from top to the base 42 of the translating means 36 `but is spaced from the base 42 thereby allowing the provision of a continuous circumferential surface 50 of resilient sealing means between the bottom of the curved plate 46 and the top of the base 42 of the translating means 36. This continuous strip of resilient material S forms a circumferential seal contacting the curved inner surface 30 of the upper housing 14 to form a seal therewith and is of particular importance in providing an improved closing action of the blowout preventer as will be more fully described hereinafter.
The bases 42 of the translating means 36 translate the vertical motion of the piston 38 into the inward rolling motion of the whole packing element 19 by transmitting the piston force through the web 44 and the curved plates 46. It is to be noted that the translating means 36 and sealing means have no positive connection with the piston 38 but merely rest thereon thereby providing ease of replacement of the packing element 19 merely by removal of the upper housing 14 and replacement therein. It has also to be noted that the bottom 52 of the base 42 of the translating means 36 is arcuately shaped, such as cylindrically, thus allowing for the rocking movement of the translating means 36 on the head 39 of the piston 38 during the closing and opening operation. The improved stripping action of the packing element 19 results from the inward spherical motion of the translating means 36 and their location with reference to the sealing means 20. Thus a metal supported sealing is generated on the top side of the packing element 19. The bottom side of the packing element 19 is free of rigid metal and since the packing element 19 is not connected to the piston 38 the bottom side of the sealing means 20 can seal and easily and flexibly adjust to changes in the configuration of the drilling string during stripping operations.
Referring now to FIGS. 3 and 5, it is noted that a plurality of spaced recesses 54 are positioned around the exterior 34 of the sealing means 20 and positioned above the circumferential seal 50 and lbetween the curved plates 46 of the translating means 36. Thus, during the closing process, when the translating means 36 move inwardly and the space or recess 54 between the curved plates 46 is diminishing in width. the resilient material does not flow between the plates 46 to become pinched off or interfere with the closing operations, but may ow inwardly between the vertical webs 44.
The packing element 19 has a self-opening capability. The force resulting from the potential energy stored in the compressed resilient sealing means 20 exerts sufficient downward pressure on the piston 38 to provide a cornplete return of the packing element 19 into the open relaxed position of FIG. l after the control pressure in line 40 has been relieved. Thus, only a single hydraulic line 40 is required to actuate the piston 38 on land based operations. For subsea application two hydraulic lines are required in order to balance the forces which act on the piston 38 and result from the static lluid head in the control lines. For this purpose a sealing insert 56 (FIGS. 2, 4, 4A and 4B) carrying the seals 57a, 57b and 57C is provided. Seals 57a and 57b seal-olf the space above the piston and allow uid pressure to be applied on the back side of the piston 38 through a hydraulic line 58. Seal 57o prevents sea water from entering the housing 12.
In addition to the main sealing action of the resilient sealing means 20 against the pipe 26, or open hole, as best seen in FIGS. 4A and 4B, two additional sealing actions are automatically obtained during the closing process as the force of the piston 38 is applied to close the packing element 19. One additional sealing action takes place between the resilient sealing means 20 and the top of the piston head 39 along the surface 60 and another sealing action occurs between the circumferential seal S0 and the inner curved surface 30 of the upper housing 14 along surface 62. Thus, the resilient sealing means 20 performs all of the internal sealing functions of the blowout preventer and thus the replacement of a worn-out packing element 19 does not require a disengagement or a replacement of any additional seal.
In subsea applications, the sealing area 62 formed by the upper housing 14 and the circumferential seal 50 of the resilient seal 20 determines the balance of forces which results from the static fluid head of the drilling mud within a riser pipe and the static fluid head in both control lines. The hydraulic balance of the submerged spherical blowout preventor 10 can best be seen from FIG. 2. In the open position of the apparatus 10, when the packing element 19 is exerting no sealing action the forces acting on the piston 38 in the direction opposing closing are the head of the drilling mud acting on the area A, and the head of the control fluid in the control line 58 acting on the piston area B of the piston 38. The force acting in the direction of closing the blowout preventer is the head of the control fluid in the control line 40 acting upon the area C of the piston 38.
When the apparatus head is opened, as shown in FIG. 2, the forces acting upon the piston 38 are unbalanced since the drilling mud acting upon the area A is usually heavier than the control fluid acting on the opposite side C of the piston 38. Thus in order to start closing the packing element 1'9, more control pressure than on a comparable land based operation must be applied through line 40 to the area C of the piston 38 to overcome this unbalance. However, as the piston 38 moves upwardly, the circumferential seal 50 on the sealing element 19 which forms the seal with the inner curve surface 30 along the area 62 also moves upwardly along the curved inner surface 30 and, as best seen in FIG. 4, progressively decreases the area A thus gradually changing the hydraulic balance in favor of the forces which act in the direction of closing the preventer. When, at a certain stroke, the seal 50 moves in the position indicated in FIG. 4A, where the upper outer edge 51 of the circumferential seal 50 coincides axially with the diameter Dx, the area A has entirely disappeared and the forces resulting from the static head of drilling mud do not affect the piston balance any more since they are equally distributed on both sides of the piston head 60, on an area confined by the inside diameter of the piston Dx and the diameter of the piston bore Dx. At this point, however, the `balance has already shifted in favor of the forces acting in the direction of closing the blowout preventer as the area B is smaller than the area C. An additional balance shift in the same direction takes effect if the piston can be further stroked as shown in FIG. 4B, thus further reducing the upper piston head area exposed to the static head of the drilling mud. This effectively allows the hydrostatic pressure of the drilling mud column to support the closing action of the blowout preventer.
The result of this closing feature is that less control pressure has to be applied for closing the blowout preventer in a submerged condition than on a comparable land based operation without fluid heads within the riser and in the control lines. The unbalance condition at initial stroke, which is in favor of the forces acting in the direction opposite to closing, is of little practical importance, since almost all of the sealing action takes place at piston strokes when the area A becomes zero as in FIG. 4A or negative as in FIG. 4B.
In connection with the improved closing performance, another important feature of the present invention is the provision of an annular space 64 between the packing element 19, the sealing insert 56 and the upper housing 14 exteriorly of the actuating head 39 of the piston 38 which increases in volume with progressive stroking of the piston 38 thus avoiding a uid trap therein which might otherwise break the sealing action along the area 62.
In operation, hydraulic fluid is introduced in the line 40 and applied against the area C of the piston 38 causing upward movement of the piston 38 against the metallic translating means 36 and the resilient sealing means 20 causing the curved plates 46 of the translating means 36 to slidably engage and move along the inner curved housing surface 30 and inwardly to translate the axial motion of the actuating means 38 into an inward rolling motion of the sealing means forcing the sealing means into a sealing position to completely seal off a well hole with or without a drill string 26. For opening the apparatus in a land rig, the pressure in the line 40 is relieved and the spring force of the compressed resilient sealing element exerts suicient downward pressure on the piston 38 to provide a complete return of the packing element 19 into its open relaxed position. For subsea applications where two control lines are required to balance the forces resulting from the fluid heads, the piston 38 may be retracted by application of fluid pressures through line 58 acting upon the area B of the piston.
The present invention, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned as well as others inherent therein.
What is claimed is:
1. In a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, a resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position, and translating means slidably cooperating with said curved inner surface of said housing and cooperating with said sealing means for converting axial movement of an actuating means into an inward motion of said sealing means, the improvement comprising,
said translating means having an outer surface mating with the curved inner surface of said housing, said outer surface being of an axial extent less than the curved outer surface of the sealing means and being of an axial extent less than the curved inner surface of the housing and said resilient sealing means circumferentially extends below said outer surface off the translating means and contacting the curved inner surface of the housing to form a circumferential seal with the inner surface which decreases the effective fluid pressure area of the sealing means responsive to the lluid pressure at the receiving port as the sealing means moves to the sealing position.
2. The apparatus of claim 1 wherein said translating means including a plurality of radially spaced metallic segments, and the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of sufficient dimension to prevent flow of the resilient material between the curved outer surface of adjacent segments to interfere with closing of same.
3. In a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position, a plurality of curved metallic translating means slidably cooperating with said curved inner surface of said housing, axial movable actuating means in said housing for moving said translating means and said sealing means toward said curved inner surface of said housing, the improvement comprising,
said translating means including a curved outer surface mating with the curved inner surface of the housing, said curved outer surface of the translating means is of an axial extent less than the axial extent of the curved outer surface of the sealing means and of an axial extent less than the axial extent of the housing curved inner surface,
said resilient sealing means circumferentially extending below said outer curved surface of the translating means to form a circumferential seal in contact with the inner surface of the housing which decreases the effective [fluid pressure area of the sealing means responsive to the `fluid pressure at the receiving port as the sealing means moves to the sealing position, said translating means having a base, and
said base and the resilient sealing means positioned against but free of said actuating means whereby the sealing means may flexibly adjust to changes in the configuration of equipment passing through the receiving port.
4. The apparatus of claim 3 wherein said translating means including a plurality of radially spaced metallic segments, and the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of suicient dimension to prevent dlow of the resilient material between the curved outer surface of adjacent segments to interifere with closing of same.
5. In a blowout preventer adapted for use on an oil well rig, and having a housing provided with a well tool receiving port and a curved inner surface extending from the receiving port, resilient sealing means within said housing having a curved outer surface and adapted to move between a nonsealing and a sealing position and a plurality of radially spaced metallic translating means slidably cooperating with said curved inner surface of the housing and the sealing means for sealing, axially movable actuating means in the housing for moving the translating means and sealing means toward said curved inner surface to provide an inward motion of the sealing means, the improvement comprising,
said translating means including a base, a rib extending upward therefrom, and a curved plate having an outer surface for mating with the curved inner surface of said housing, said curved plate being spaced from the base and the extent of the curved plate being less than the extent of the curved outer surface of the sealing means and being less than. the extent of the curved inner surface of said housing, and said resilient sealing means circumferentially extending between the curved plate and the base and contacting the curved inner surface of the housing for forming a circumferential seal therewith which decreases the effective iiuid pressure area of the sealing means responsive to the fluid pressure of the receiving port as the sealing means moves to the sealing position. 6. The apparatus of claim 5 wherein the base includes an arcuate surface in contact with but disconnected from the said actuating means.
7. The apparatus of claim 5 wherein the resilient sealing means includes an exterior recess between adjacent segments positioned above said circumferential seal and of sufficient' dimension to prevent ow of the resilient material between the curved outer surface of adjacent segments to interfere with closing of same.
8. The apparatus of claim 5 including,
an annular space defined by the outer circumference of the lower portion of the seal, the actuating means,
the housing, the translating means, and the sealing means which increases in size as the actuating means moves the seal toward a closed position to avoid a fluid trap.
References Cited UNITED STATES PATENTS 3,323,773 6/1967 Walker -251-1 2,731,281 l/1956 Knox 277-73 X `2,846,178 8?/ 1958 Minor 2'51--1 3,561,7-2-3 `2/1971 Cugini 251--1 ROBERT G. NILSON, Primary Examiner R. GERARD, Assistant Examiner U.S. C1. X.R. 277-73
US27947A 1970-04-13 1970-04-13 Blowout preventer Expired - Lifetime US3667721A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2794770A 1970-04-13 1970-04-13

Publications (1)

Publication Number Publication Date
US3667721A true US3667721A (en) 1972-06-06

Family

ID=21840693

Family Applications (1)

Application Number Title Priority Date Filing Date
US27947A Expired - Lifetime US3667721A (en) 1970-04-13 1970-04-13 Blowout preventer

Country Status (12)

Country Link
US (1) US3667721A (en)
JP (1) JPS5434869B1 (en)
BR (1) BR7102173D0 (en)
CA (1) CA933466A (en)
DE (1) DE2117835C3 (en)
FR (1) FR2086020B1 (en)
GB (1) GB1294288A (en)
IL (1) IL36415A (en)
NL (1) NL169097C (en)
RO (1) RO60357A (en)
SU (1) SU506312A3 (en)
YU (1) YU34925B (en)

Cited By (94)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740791A1 (en) * 1976-09-10 1978-03-16 Cameron Iron Works Inc RING-SHAPED BLOW-OUT PREVENTER
US4208056A (en) * 1977-10-18 1980-06-17 Biffle Morris S Rotating blowout preventor with index kelly drive bushing and stripper rubber
US4283039A (en) * 1980-06-05 1981-08-11 Nl Industries, Inc. Annular blowout preventer with upper and lower spherical sealing surfaces
US4310139A (en) * 1980-04-04 1982-01-12 Cameron Iron Works, Inc. Annular blowout preventer
US4325404A (en) * 1978-08-30 1982-04-20 Larsen Peder M Valve claw to be situated at the end of a pipe to mount a closing valve
US4332367A (en) * 1980-05-02 1982-06-01 Nl Industries, Inc. Blowout preventer having a variable ram seal
WO1984001799A1 (en) * 1982-11-05 1984-05-10 Hydril Co Safety valve apparatus and method
EP0108895A1 (en) * 1982-11-12 1984-05-23 Cameron Iron Works, Inc. Annular blowout preventer
US4460149A (en) * 1980-06-05 1984-07-17 Nl Industries, Inc. Annular blowout preventer with upper and lower spherical sealing surfaces
US4460151A (en) * 1981-12-29 1984-07-17 Cameron Iron Works, Inc. Annular blowout preventer
US4703807A (en) * 1982-11-05 1987-11-03 Hydril Company Rotatable ball valve apparatus and method
US4858882A (en) * 1987-05-27 1989-08-22 Beard Joseph O Blowout preventer with radial force limiter
US4949785A (en) * 1989-05-02 1990-08-21 Beard Joseph O Force-limiting/wear compensating annular sealing element for blowout preventers
US5647444A (en) * 1992-09-18 1997-07-15 Williams; John R. Rotating blowout preventor
US5662181A (en) * 1992-09-30 1997-09-02 Williams; John R. Rotating blowout preventer
US5851013A (en) * 1997-07-03 1998-12-22 Hydril Company Blowout preventer packing element with metallic inserts
US6138774A (en) * 1998-03-02 2000-10-31 Weatherford Holding U.S., Inc. Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
US6263982B1 (en) 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6321846B1 (en) * 2000-02-24 2001-11-27 Schlumberger Technology Corp. Sealing device for use in subsea wells
US6470975B1 (en) 1999-03-02 2002-10-29 Weatherford/Lamb, Inc. Internal riser rotating control head
US20050072566A1 (en) * 2003-02-13 2005-04-07 Kelly Borden Blowout preventer packing element with non-metallic composite inserts
US20080027693A1 (en) * 2006-07-28 2008-01-31 Hydril Company Lp Method of designing blowout preventer seal using finite element analysis
US20080023917A1 (en) * 2006-07-28 2008-01-31 Hydril Company Lp Seal for blowout preventer with selective debonding
US20080078081A1 (en) * 2006-09-28 2008-04-03 Huff Philip A High pressure-rated ram blowout preventer and method of manufacture
US20080078554A1 (en) * 2006-09-28 2008-04-03 Huff Philip A Imputing strength gradient in pressure vessels
US20080105341A1 (en) * 2006-11-02 2008-05-08 Huff Philip A Heat treatment of inlaid pressure vessels
US20080105340A1 (en) * 2006-11-02 2008-05-08 Huff Philip A Heat Treatment Method of Inlaid Pressure Vessels
US20090057026A1 (en) * 2007-08-27 2009-03-05 Williams John R Spring load seal assembly and well drilling equipment comprising same
US20090057021A1 (en) * 2007-08-27 2009-03-05 Williams John R Bearing assembly inner barrel and well drilling equipment comprising same
US20090057023A1 (en) * 2007-08-27 2009-03-05 Williams John R Spring preloaded bearing assembly and well drilling equipment comprising same
US20090057022A1 (en) * 2007-08-27 2009-03-05 Williams John R Bearing assembly system with integral lubricant distribution and well drilling equipment comprising same
US20090200747A1 (en) * 2008-02-07 2009-08-13 Williams John R Breech lock stripper rubber pot mounting structure and well drilling equipment comprising same
US20090302243A1 (en) * 2008-06-09 2009-12-10 Scott Delbridge Wiper seal assembly
US20100095507A1 (en) * 2006-09-28 2010-04-22 Huff Philip A Reinforcement of irregular pressure vessels
US7717170B2 (en) 2007-08-27 2010-05-18 Williams John R Stripper rubber pot mounting structure and well drilling equipment comprising same
US7726416B2 (en) 2007-08-27 2010-06-01 Theresa J. Williams, legal representative Bearing assembly retaining apparatus and well drilling equipment comprising same
US7762320B2 (en) 2007-08-27 2010-07-27 Williams John R Heat exchanger system and method of use thereof and well drilling equipment comprising same
US7766100B2 (en) 2007-08-27 2010-08-03 Theresa J. Williams, legal representative Tapered surface bearing assembly and well drilling equiment comprising same
US7789172B2 (en) 2007-08-27 2010-09-07 Williams John R Tapered bearing assembly cover plate and well drilling equipment comprising same
US7836946B2 (en) 2002-10-31 2010-11-23 Weatherford/Lamb, Inc. Rotating control head radial seal protection and leak detection systems
US7926593B2 (en) 2004-11-23 2011-04-19 Weatherford/Lamb, Inc. Rotating control device docking station
US7997345B2 (en) 2007-10-19 2011-08-16 Weatherford/Lamb, Inc. Universal marine diverter converter
US20110226475A1 (en) * 2006-04-25 2011-09-22 National Oilwell Varco, L.P. System and method for severing a tubular
WO2011128690A1 (en) 2010-04-13 2011-10-20 Managed Pressure Operations Pte. Limited Blowout preventer assembly
US20120073113A1 (en) * 2010-09-28 2012-03-29 Smith International, Inc. Adaptor flange for rotary control device
US8286734B2 (en) 2007-10-23 2012-10-16 Weatherford/Lamb, Inc. Low profile rotating control device
US8322432B2 (en) 2009-01-15 2012-12-04 Weatherford/Lamb, Inc. Subsea internal riser rotating control device system and method
US8347982B2 (en) 2010-04-16 2013-01-08 Weatherford/Lamb, Inc. System and method for managing heave pressure from a floating rig
US8347983B2 (en) 2009-07-31 2013-01-08 Weatherford/Lamb, Inc. Drilling with a high pressure rotating control device
US8448711B2 (en) 2010-09-23 2013-05-28 Charles J. Miller Pressure balanced drilling system and method using the same
US20130233562A1 (en) * 2012-03-12 2013-09-12 Managed Pressure Operations Pte Ltd. Blowout preventer assembly
US8826988B2 (en) 2004-11-23 2014-09-09 Weatherford/Lamb, Inc. Latch position indicator system and method
US8844652B2 (en) 2007-10-23 2014-09-30 Weatherford/Lamb, Inc. Interlocking low profile rotating control device
DE102013217383A1 (en) 2013-08-30 2015-03-19 Klaus Biester Blowout Preventer Stack and Supply System
CN104653141A (en) * 2013-11-22 2015-05-27 Zp因特莱茨有限责任公司 Spherical-annular blowout preventer having a plurality of pistons
CN104653142A (en) * 2013-11-22 2015-05-27 Zp因特莱茨有限责任公司 Spherical-annular blowout preventer having a plurality of pistons
US9068423B2 (en) 2012-02-03 2015-06-30 National Oilwell Varco, L.P. Wellhead connector and method of using same
US9074450B2 (en) 2012-02-03 2015-07-07 National Oilwell Varco, L.P. Blowout preventer and method of using same
WO2015148858A1 (en) * 2014-03-28 2015-10-01 National Oilwell Varco, L.P. Spherical blowout preventer with energizeable packer seal and method of using same
US9169710B2 (en) 2012-04-05 2015-10-27 National Oilwell Varco, L.P. Wellsite connector with piston driven collets and method of using same
US9175542B2 (en) 2010-06-28 2015-11-03 Weatherford/Lamb, Inc. Lubricating seal for use with a tubular
US9359853B2 (en) 2009-01-15 2016-06-07 Weatherford Technology Holdings, Llc Acoustically controlled subsea latching and sealing system and method for an oilfield device
WO2016097677A1 (en) * 2014-12-17 2016-06-23 Managed Pressure Operations Pte. Ltd. Pressure containment devices
US9605502B2 (en) 2012-04-11 2017-03-28 Managed Pressure Operations Pte Ltd Method of handling a gas influx in a riser
US9784065B2 (en) 2014-01-27 2017-10-10 Katch Kan Holdings Ltd. Apparatus and method for stripping solids and fluids from a string used in drilling or servicing wells
KR20170117182A (en) * 2015-02-17 2017-10-20 내셔널 오일웰 바르코 엘.피. Spherical explosion-proof wiper sweeper
US9816326B2 (en) 2012-04-04 2017-11-14 National Oilwell Varco, L.P. Misalignment-tolerant wellsite connection assembly, system, and method
US20180010410A1 (en) * 2016-07-08 2018-01-11 Cameron International Corporation Blowout preventer apparatus and method
DE102016216469A1 (en) 2016-08-31 2018-03-01 Klaus Biester Blowout Preventer Stack
US9938793B2 (en) * 2015-11-24 2018-04-10 Freudenberg Oil & Gas, Llc Spherical blow out preventer annular seal
US10012044B2 (en) 2014-11-18 2018-07-03 Weatherford Technology Holdings, Llc Annular isolation device for managed pressure drilling
US10041335B2 (en) 2008-03-07 2018-08-07 Weatherford Technology Holdings, Llc Switching device for, and a method of switching, a downhole tool
US10309191B2 (en) 2012-03-12 2019-06-04 Managed Pressure Operations Pte. Ltd. Method of and apparatus for drilling a subterranean wellbore
US20190178047A1 (en) * 2017-12-12 2019-06-13 Axon Pressure Products, Inc. Annular blowout preventer packing element
US10774599B2 (en) 2013-12-19 2020-09-15 Weatherford Technology Holdings, Llc Heave compensation system for assembling a drill string
US10858901B1 (en) * 2018-02-20 2020-12-08 Shazam Rahim Remotely operated connecting assembly and method
US11136849B2 (en) 2019-11-05 2021-10-05 Saudi Arabian Oil Company Dual string fluid management devices for oil and gas applications
US11156052B2 (en) 2019-12-30 2021-10-26 Saudi Arabian Oil Company Wellbore tool assembly to open collapsed tubing
US11230904B2 (en) 2019-11-11 2022-01-25 Saudi Arabian Oil Company Setting and unsetting a production packer
EP3803036A4 (en) * 2018-05-31 2022-01-26 National Oilwell Varco, L.P. Blowout preventer apparatus and method
US11253819B2 (en) 2020-05-14 2022-02-22 Saudi Arabian Oil Company Production of thin film composite hollow fiber membranes
US11260351B2 (en) 2020-02-14 2022-03-01 Saudi Arabian Oil Company Thin film composite hollow fiber membranes fabrication systems
US11448026B1 (en) 2021-05-03 2022-09-20 Saudi Arabian Oil Company Cable head for a wireline tool
US11549329B2 (en) 2020-12-22 2023-01-10 Saudi Arabian Oil Company Downhole casing-casing annulus sealant injection
US11598178B2 (en) 2021-01-08 2023-03-07 Saudi Arabian Oil Company Wellbore mud pit safety system
US11655925B1 (en) * 2016-12-01 2023-05-23 Texas First Industrial Corp Connector system and method of use
US11655685B2 (en) 2020-08-10 2023-05-23 Saudi Arabian Oil Company Downhole welding tools and related methods
US11828128B2 (en) 2021-01-04 2023-11-28 Saudi Arabian Oil Company Convertible bell nipple for wellbore operations
US11859815B2 (en) 2021-05-18 2024-01-02 Saudi Arabian Oil Company Flare control at well sites
US11905791B2 (en) 2021-08-18 2024-02-20 Saudi Arabian Oil Company Float valve for drilling and workover operations
US11913298B2 (en) 2021-10-25 2024-02-27 Saudi Arabian Oil Company Downhole milling system
US11993992B2 (en) 2022-08-29 2024-05-28 Saudi Arabian Oil Company Modified cement retainer with milling assembly
US12054999B2 (en) 2021-03-01 2024-08-06 Saudi Arabian Oil Company Maintaining and inspecting a wellbore
US12116326B2 (en) 2021-11-22 2024-10-15 Saudi Arabian Oil Company Conversion of hydrogen sulfide and carbon dioxide into hydrocarbons using non-thermal plasma and a catalyst

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9388657B2 (en) * 2012-07-13 2016-07-12 Clinton D. Nelson Automatic annular blow-out preventer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846178A (en) * 1955-01-24 1958-08-05 Regan Forge & Eng Co Conical-type blowout preventer

Cited By (149)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740791A1 (en) * 1976-09-10 1978-03-16 Cameron Iron Works Inc RING-SHAPED BLOW-OUT PREVENTER
FR2364324A1 (en) * 1976-09-10 1978-04-07 Cameron Iron Works Inc ERUPTION VALVE FOR DRILLING HEAD
US4099699A (en) * 1976-09-10 1978-07-11 Cameron Iron Works, Inc. Annular blowout preventer
US4208056A (en) * 1977-10-18 1980-06-17 Biffle Morris S Rotating blowout preventor with index kelly drive bushing and stripper rubber
US4325404A (en) * 1978-08-30 1982-04-20 Larsen Peder M Valve claw to be situated at the end of a pipe to mount a closing valve
US4310139A (en) * 1980-04-04 1982-01-12 Cameron Iron Works, Inc. Annular blowout preventer
US4332367A (en) * 1980-05-02 1982-06-01 Nl Industries, Inc. Blowout preventer having a variable ram seal
FR2484012A1 (en) * 1980-06-05 1981-12-11 Nl Industries Inc ANNULAR ANTI-ERUPTION SHUTTER FOR OIL OR GAS DRILLING INSTALLATION
US4283039A (en) * 1980-06-05 1981-08-11 Nl Industries, Inc. Annular blowout preventer with upper and lower spherical sealing surfaces
US4460149A (en) * 1980-06-05 1984-07-17 Nl Industries, Inc. Annular blowout preventer with upper and lower spherical sealing surfaces
US4460151A (en) * 1981-12-29 1984-07-17 Cameron Iron Works, Inc. Annular blowout preventer
WO1984001799A1 (en) * 1982-11-05 1984-05-10 Hydril Co Safety valve apparatus and method
US4703807A (en) * 1982-11-05 1987-11-03 Hydril Company Rotatable ball valve apparatus and method
EP0108895A1 (en) * 1982-11-12 1984-05-23 Cameron Iron Works, Inc. Annular blowout preventer
US4858882A (en) * 1987-05-27 1989-08-22 Beard Joseph O Blowout preventer with radial force limiter
US4949785A (en) * 1989-05-02 1990-08-21 Beard Joseph O Force-limiting/wear compensating annular sealing element for blowout preventers
US5647444A (en) * 1992-09-18 1997-07-15 Williams; John R. Rotating blowout preventor
US5662181A (en) * 1992-09-30 1997-09-02 Williams; John R. Rotating blowout preventer
US5851013A (en) * 1997-07-03 1998-12-22 Hydril Company Blowout preventer packing element with metallic inserts
US6138774A (en) * 1998-03-02 2000-10-31 Weatherford Holding U.S., Inc. Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
US6263982B1 (en) 1998-03-02 2001-07-24 Weatherford Holding U.S., Inc. Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6470975B1 (en) 1999-03-02 2002-10-29 Weatherford/Lamb, Inc. Internal riser rotating control head
US6321846B1 (en) * 2000-02-24 2001-11-27 Schlumberger Technology Corp. Sealing device for use in subsea wells
US7836946B2 (en) 2002-10-31 2010-11-23 Weatherford/Lamb, Inc. Rotating control head radial seal protection and leak detection systems
US7934545B2 (en) 2002-10-31 2011-05-03 Weatherford/Lamb, Inc. Rotating control head leak detection systems
US8113291B2 (en) 2002-10-31 2012-02-14 Weatherford/Lamb, Inc. Leak detection method for a rotating control head bearing assembly and its latch assembly using a comparator
US8353337B2 (en) 2002-10-31 2013-01-15 Weatherford/Lamb, Inc. Method for cooling a rotating control head
US8714240B2 (en) 2002-10-31 2014-05-06 Weatherford/Lamb, Inc. Method for cooling a rotating control device
US20050072566A1 (en) * 2003-02-13 2005-04-07 Kelly Borden Blowout preventer packing element with non-metallic composite inserts
US7409988B2 (en) * 2003-02-13 2008-08-12 Kelly Borden Blowout preventer packing element with non-metallic composite inserts
US8939235B2 (en) 2004-11-23 2015-01-27 Weatherford/Lamb, Inc. Rotating control device docking station
US8701796B2 (en) 2004-11-23 2014-04-22 Weatherford/Lamb, Inc. System for drilling a borehole
US10024154B2 (en) 2004-11-23 2018-07-17 Weatherford Technology Holdings, Llc Latch position indicator system and method
US8408297B2 (en) 2004-11-23 2013-04-02 Weatherford/Lamb, Inc. Remote operation of an oilfield device
US9784073B2 (en) 2004-11-23 2017-10-10 Weatherford Technology Holdings, Llc Rotating control device docking station
US9404346B2 (en) 2004-11-23 2016-08-02 Weatherford Technology Holdings, Llc Latch position indicator system and method
US7926593B2 (en) 2004-11-23 2011-04-19 Weatherford/Lamb, Inc. Rotating control device docking station
US8826988B2 (en) 2004-11-23 2014-09-09 Weatherford/Lamb, Inc. Latch position indicator system and method
US20110226475A1 (en) * 2006-04-25 2011-09-22 National Oilwell Varco, L.P. System and method for severing a tubular
US8424607B2 (en) * 2006-04-25 2013-04-23 National Oilwell Varco, L.P. System and method for severing a tubular
US20080066906A1 (en) * 2006-07-28 2008-03-20 Hydril Company Lp Annular bop packing unit
US7736556B2 (en) 2006-07-28 2010-06-15 Hydril Usa Manufacturing Llc Revised cure cycle for annular packing units
US20080027693A1 (en) * 2006-07-28 2008-01-31 Hydril Company Lp Method of designing blowout preventer seal using finite element analysis
US20080023865A1 (en) * 2006-07-28 2008-01-31 Hydril Company Lp Revised cure cycle for annular packing units
EP2049763B1 (en) * 2006-07-28 2017-11-29 Hydril USA Manufacturing LLC Annular bop packing unit
US20080023917A1 (en) * 2006-07-28 2008-01-31 Hydril Company Lp Seal for blowout preventer with selective debonding
US8176933B2 (en) 2006-07-28 2012-05-15 Hydril Usa Manufacturing Llc Annular BOP packing unit
US20100095507A1 (en) * 2006-09-28 2010-04-22 Huff Philip A Reinforcement of irregular pressure vessels
US7721401B2 (en) 2006-09-28 2010-05-25 Hydril Usa Manufacturing Llc Reinforcement of irregular pressure vessels
US20080078554A1 (en) * 2006-09-28 2008-04-03 Huff Philip A Imputing strength gradient in pressure vessels
US20080078081A1 (en) * 2006-09-28 2008-04-03 Huff Philip A High pressure-rated ram blowout preventer and method of manufacture
US7849599B2 (en) 2006-09-28 2010-12-14 Hydril Usa Manufacturing Llc Imputing strength gradient in pressure vessels
US20080105340A1 (en) * 2006-11-02 2008-05-08 Huff Philip A Heat Treatment Method of Inlaid Pressure Vessels
US20080105341A1 (en) * 2006-11-02 2008-05-08 Huff Philip A Heat treatment of inlaid pressure vessels
US7559359B2 (en) 2007-08-27 2009-07-14 Williams John R Spring preloaded bearing assembly and well drilling equipment comprising same
US7798250B2 (en) 2007-08-27 2010-09-21 Theresa J. Williams, legal representative Bearing assembly inner barrel and well drilling equipment comprising same
US7635034B2 (en) 2007-08-27 2009-12-22 Theresa J. Williams, legal representative Spring load seal assembly and well drilling equipment comprising same
US7789172B2 (en) 2007-08-27 2010-09-07 Williams John R Tapered bearing assembly cover plate and well drilling equipment comprising same
US20090057026A1 (en) * 2007-08-27 2009-03-05 Williams John R Spring load seal assembly and well drilling equipment comprising same
US7766100B2 (en) 2007-08-27 2010-08-03 Theresa J. Williams, legal representative Tapered surface bearing assembly and well drilling equiment comprising same
US20090057021A1 (en) * 2007-08-27 2009-03-05 Williams John R Bearing assembly inner barrel and well drilling equipment comprising same
US7762320B2 (en) 2007-08-27 2010-07-27 Williams John R Heat exchanger system and method of use thereof and well drilling equipment comprising same
US20090057022A1 (en) * 2007-08-27 2009-03-05 Williams John R Bearing assembly system with integral lubricant distribution and well drilling equipment comprising same
US7717170B2 (en) 2007-08-27 2010-05-18 Williams John R Stripper rubber pot mounting structure and well drilling equipment comprising same
US20090057023A1 (en) * 2007-08-27 2009-03-05 Williams John R Spring preloaded bearing assembly and well drilling equipment comprising same
US7717169B2 (en) 2007-08-27 2010-05-18 Theresa J. Williams, legal representative Bearing assembly system with integral lubricant distribution and well drilling equipment comprising same
US7726416B2 (en) 2007-08-27 2010-06-01 Theresa J. Williams, legal representative Bearing assembly retaining apparatus and well drilling equipment comprising same
US7997345B2 (en) 2007-10-19 2011-08-16 Weatherford/Lamb, Inc. Universal marine diverter converter
US10087701B2 (en) 2007-10-23 2018-10-02 Weatherford Technology Holdings, Llc Low profile rotating control device
US8844652B2 (en) 2007-10-23 2014-09-30 Weatherford/Lamb, Inc. Interlocking low profile rotating control device
US8286734B2 (en) 2007-10-23 2012-10-16 Weatherford/Lamb, Inc. Low profile rotating control device
US9004181B2 (en) 2007-10-23 2015-04-14 Weatherford/Lamb, Inc. Low profile rotating control device
US7708089B2 (en) 2008-02-07 2010-05-04 Theresa J. Williams, legal representative Breech lock stripper rubber pot mounting structure and well drilling equipment comprising same
US20090200747A1 (en) * 2008-02-07 2009-08-13 Williams John R Breech lock stripper rubber pot mounting structure and well drilling equipment comprising same
US10041335B2 (en) 2008-03-07 2018-08-07 Weatherford Technology Holdings, Llc Switching device for, and a method of switching, a downhole tool
US8403290B2 (en) * 2008-06-09 2013-03-26 Alberta Petroleum Industries Ltd. Wiper seal assembly
US20090302243A1 (en) * 2008-06-09 2009-12-10 Scott Delbridge Wiper seal assembly
US9359853B2 (en) 2009-01-15 2016-06-07 Weatherford Technology Holdings, Llc Acoustically controlled subsea latching and sealing system and method for an oilfield device
US8322432B2 (en) 2009-01-15 2012-12-04 Weatherford/Lamb, Inc. Subsea internal riser rotating control device system and method
US8770297B2 (en) 2009-01-15 2014-07-08 Weatherford/Lamb, Inc. Subsea internal riser rotating control head seal assembly
US8636087B2 (en) 2009-07-31 2014-01-28 Weatherford/Lamb, Inc. Rotating control system and method for providing a differential pressure
US8347983B2 (en) 2009-07-31 2013-01-08 Weatherford/Lamb, Inc. Drilling with a high pressure rotating control device
US9334711B2 (en) 2009-07-31 2016-05-10 Weatherford Technology Holdings, Llc System and method for cooling a rotating control device
WO2011128690A1 (en) 2010-04-13 2011-10-20 Managed Pressure Operations Pte. Limited Blowout preventer assembly
US8347982B2 (en) 2010-04-16 2013-01-08 Weatherford/Lamb, Inc. System and method for managing heave pressure from a floating rig
US8863858B2 (en) 2010-04-16 2014-10-21 Weatherford/Lamb, Inc. System and method for managing heave pressure from a floating rig
US9260927B2 (en) 2010-04-16 2016-02-16 Weatherford Technology Holdings, Llc System and method for managing heave pressure from a floating rig
US9175542B2 (en) 2010-06-28 2015-11-03 Weatherford/Lamb, Inc. Lubricating seal for use with a tubular
US8448711B2 (en) 2010-09-23 2013-05-28 Charles J. Miller Pressure balanced drilling system and method using the same
US20120073113A1 (en) * 2010-09-28 2012-03-29 Smith International, Inc. Adaptor flange for rotary control device
US9038729B2 (en) * 2010-09-28 2015-05-26 Smith International, Inc. Adaptor flange for rotary control device
US9605504B2 (en) 2011-03-23 2017-03-28 Managed Pressure Operations Pte Ltd Sealing assembly
US9488031B2 (en) * 2011-03-23 2016-11-08 Managed Pressure Operations Pte. Ltd. Blow out preventer
US9068423B2 (en) 2012-02-03 2015-06-30 National Oilwell Varco, L.P. Wellhead connector and method of using same
US9074450B2 (en) 2012-02-03 2015-07-07 National Oilwell Varco, L.P. Blowout preventer and method of using same
US10309191B2 (en) 2012-03-12 2019-06-04 Managed Pressure Operations Pte. Ltd. Method of and apparatus for drilling a subterranean wellbore
US20130233562A1 (en) * 2012-03-12 2013-09-12 Managed Pressure Operations Pte Ltd. Blowout preventer assembly
US9004178B2 (en) * 2012-03-12 2015-04-14 Managed Pressure Operations Pte Ltd. Blowout preventer assembly
US9816326B2 (en) 2012-04-04 2017-11-14 National Oilwell Varco, L.P. Misalignment-tolerant wellsite connection assembly, system, and method
US9869148B2 (en) 2012-04-05 2018-01-16 National Oilwell Varco, L.P. Wellsite connector with floating seal member and method of using same
US9169710B2 (en) 2012-04-05 2015-10-27 National Oilwell Varco, L.P. Wellsite connector with piston driven collets and method of using same
US9605502B2 (en) 2012-04-11 2017-03-28 Managed Pressure Operations Pte Ltd Method of handling a gas influx in a riser
DE102013217383A1 (en) 2013-08-30 2015-03-19 Klaus Biester Blowout Preventer Stack and Supply System
US9863206B2 (en) 2013-08-30 2018-01-09 Klaus Biester Blowout preventer stack and supply system
EP2876248A3 (en) * 2013-11-22 2015-06-03 ZP Interests, LLC Spherical-annular blowout preventer having a plurality of pistons
CN104653142A (en) * 2013-11-22 2015-05-27 Zp因特莱茨有限责任公司 Spherical-annular blowout preventer having a plurality of pistons
CN104653141A (en) * 2013-11-22 2015-05-27 Zp因特莱茨有限责任公司 Spherical-annular blowout preventer having a plurality of pistons
US9121245B2 (en) 2013-11-22 2015-09-01 Zp Interests, Llc Spherical-annular blowout preventer having a plurality of pistons
US10774599B2 (en) 2013-12-19 2020-09-15 Weatherford Technology Holdings, Llc Heave compensation system for assembling a drill string
US11193340B2 (en) 2013-12-19 2021-12-07 Weatherford Technology Holdings, Llc Heave compensation system for assembling a drill string
US9784065B2 (en) 2014-01-27 2017-10-10 Katch Kan Holdings Ltd. Apparatus and method for stripping solids and fluids from a string used in drilling or servicing wells
US10107063B2 (en) 2014-01-27 2018-10-23 Katch Kan Holdings Ltd. Apparatus and method for stripping solids and fluids from a string used in drilling or servicing wells
EP3122987A1 (en) * 2014-03-28 2017-02-01 National Oilwell Varco, L.P. Spherical blowout preventer with energizeable packer seal and method of using same
US9580987B2 (en) * 2014-03-28 2017-02-28 National Oilwell Varco, L.P. Spherical blowout preventer with energizeable packer seal and method of using same
WO2015148858A1 (en) * 2014-03-28 2015-10-01 National Oilwell Varco, L.P. Spherical blowout preventer with energizeable packer seal and method of using same
US20150275609A1 (en) * 2014-03-28 2015-10-01 National Oilwell Varco, L.P. Spherical blowout preventer with energizeable packer seal and method of using same
US10012044B2 (en) 2014-11-18 2018-07-03 Weatherford Technology Holdings, Llc Annular isolation device for managed pressure drilling
WO2016097677A1 (en) * 2014-12-17 2016-06-23 Managed Pressure Operations Pte. Ltd. Pressure containment devices
GB2547871B (en) * 2014-12-17 2018-09-12 Managed Pressure Operations Pressure containment devices
GB2547871A (en) * 2014-12-17 2017-08-30 Managed Pressure Operations Pressure containment devices
US10316607B2 (en) 2014-12-17 2019-06-11 Managed Pressure Operations Pte. Ltd. Pressure containment devices
KR20170117182A (en) * 2015-02-17 2017-10-20 내셔널 오일웰 바르코 엘.피. Spherical explosion-proof wiper sweeper
US9938793B2 (en) * 2015-11-24 2018-04-10 Freudenberg Oil & Gas, Llc Spherical blow out preventer annular seal
US20180010410A1 (en) * 2016-07-08 2018-01-11 Cameron International Corporation Blowout preventer apparatus and method
US10597966B2 (en) * 2016-07-08 2020-03-24 Cameron International Corporation Blowout preventer apparatus and method
WO2018041983A1 (en) 2016-08-31 2018-03-08 Klaus Biester Blowout preventer stack
DE102016216469A1 (en) 2016-08-31 2018-03-01 Klaus Biester Blowout Preventer Stack
US10801292B2 (en) 2016-08-31 2020-10-13 Klaus Biester Blowout preventer stack
US11655925B1 (en) * 2016-12-01 2023-05-23 Texas First Industrial Corp Connector system and method of use
US20190178047A1 (en) * 2017-12-12 2019-06-13 Axon Pressure Products, Inc. Annular blowout preventer packing element
US10858901B1 (en) * 2018-02-20 2020-12-08 Shazam Rahim Remotely operated connecting assembly and method
EP3803036A4 (en) * 2018-05-31 2022-01-26 National Oilwell Varco, L.P. Blowout preventer apparatus and method
US11873695B2 (en) 2018-05-31 2024-01-16 National Oilwell Varco, L.P. Blowout preventer apparatus and method
US11136849B2 (en) 2019-11-05 2021-10-05 Saudi Arabian Oil Company Dual string fluid management devices for oil and gas applications
US11230904B2 (en) 2019-11-11 2022-01-25 Saudi Arabian Oil Company Setting and unsetting a production packer
US11156052B2 (en) 2019-12-30 2021-10-26 Saudi Arabian Oil Company Wellbore tool assembly to open collapsed tubing
US11260351B2 (en) 2020-02-14 2022-03-01 Saudi Arabian Oil Company Thin film composite hollow fiber membranes fabrication systems
US11253819B2 (en) 2020-05-14 2022-02-22 Saudi Arabian Oil Company Production of thin film composite hollow fiber membranes
US11655685B2 (en) 2020-08-10 2023-05-23 Saudi Arabian Oil Company Downhole welding tools and related methods
US11549329B2 (en) 2020-12-22 2023-01-10 Saudi Arabian Oil Company Downhole casing-casing annulus sealant injection
US11828128B2 (en) 2021-01-04 2023-11-28 Saudi Arabian Oil Company Convertible bell nipple for wellbore operations
US11598178B2 (en) 2021-01-08 2023-03-07 Saudi Arabian Oil Company Wellbore mud pit safety system
US12054999B2 (en) 2021-03-01 2024-08-06 Saudi Arabian Oil Company Maintaining and inspecting a wellbore
US11448026B1 (en) 2021-05-03 2022-09-20 Saudi Arabian Oil Company Cable head for a wireline tool
US11859815B2 (en) 2021-05-18 2024-01-02 Saudi Arabian Oil Company Flare control at well sites
US11905791B2 (en) 2021-08-18 2024-02-20 Saudi Arabian Oil Company Float valve for drilling and workover operations
US11913298B2 (en) 2021-10-25 2024-02-27 Saudi Arabian Oil Company Downhole milling system
US12116326B2 (en) 2021-11-22 2024-10-15 Saudi Arabian Oil Company Conversion of hydrogen sulfide and carbon dioxide into hydrocarbons using non-thermal plasma and a catalyst
US11993992B2 (en) 2022-08-29 2024-05-28 Saudi Arabian Oil Company Modified cement retainer with milling assembly

Also Published As

Publication number Publication date
NL169097B (en) 1982-01-04
BR7102173D0 (en) 1973-05-15
NL7104818A (en) 1971-10-15
JPS5434869B1 (en) 1979-10-30
YU91171A (en) 1979-10-31
FR2086020A1 (en) 1971-12-31
DE2117835B2 (en) 1979-01-11
RO60357A (en) 1976-06-15
DE2117835A1 (en) 1971-11-04
SU506312A3 (en) 1976-03-05
DE2117835C3 (en) 1979-09-06
CA933466A (en) 1973-09-11
NL169097C (en) 1982-06-01
YU34925B (en) 1980-04-30
GB1294288A (en) 1972-10-25
IL36415A (en) 1973-10-25
FR2086020B1 (en) 1976-07-02

Similar Documents

Publication Publication Date Title
US3667721A (en) Blowout preventer
US3323773A (en) Blow-out preventer
US3587734A (en) Adapter for converting a stationary blowout preventer to a rotary blowout preventer
US3915426A (en) Blowout preventer with variable inside diameter
US3737139A (en) Annular blowout preventer
US2609836A (en) Control head and blow-out preventer
US4099699A (en) Annular blowout preventer
US3643751A (en) Hydrostatic riser pipe tensioner
US3614111A (en) Tool joint stripping stationary blowout preventer with a retrievable packing insert
US3561723A (en) Stripping and blow-out preventer device
US3533468A (en) Well pressure compensated well blowout preventer
US3572627A (en) Blowout preventer
US3729170A (en) Rotary plug valve assembly
US3915424A (en) Blowout preventer with variable inside diameter
US4858882A (en) Blowout preventer with radial force limiter
US3589667A (en) Combination well blowout preventer
US5255890A (en) Ram type blowout preventer
US5012854A (en) Pressure release valve for a subsea blowout preventer
AU2011210071B2 (en) Underwater stuffing box and a method for running a drill string through the stuffing box
US6880638B2 (en) Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve
US4602794A (en) Annular blowout preventer with upper and lower spherical sealing surfaces and rigid translation element
US4358085A (en) Keying means for segmented end ring blowout preventer
US10077604B2 (en) Sealing element mounting
US3695349A (en) Well blowout preventer control pressure modulator
US4283039A (en) Annular blowout preventer with upper and lower spherical sealing surfaces

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: BAROID TECHNOLOGY, INC., 3000 NORTH SAM HOUSTON PA

Free format text: ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE;ASSIGNOR:RUCKER COMPANY, THE;REEL/FRAME:005023/0909

Effective date: 19890210

AS Assignment

Owner name: CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), THE

Free format text: SECURITY INTEREST;ASSIGNOR:BAROID CORPORATION, A CORP. OF DE.;REEL/FRAME:005196/0501

Effective date: 19881222

AS Assignment

Owner name: BAROID CORPORATION, TEXAS

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE MANHATTAN BANK, THE;REEL/FRAME:006085/0590

Effective date: 19911021