WO2014105629A2 - Garniture d'étanchéité de mâchoire à ouverture variable renforcée à l'aide d'un tissu - Google Patents

Garniture d'étanchéité de mâchoire à ouverture variable renforcée à l'aide d'un tissu Download PDF

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Publication number
WO2014105629A2
WO2014105629A2 PCT/US2013/076532 US2013076532W WO2014105629A2 WO 2014105629 A2 WO2014105629 A2 WO 2014105629A2 US 2013076532 W US2013076532 W US 2013076532W WO 2014105629 A2 WO2014105629 A2 WO 2014105629A2
Authority
WO
WIPO (PCT)
Prior art keywords
fibers
ram
contact surface
fabric
adjacent
Prior art date
Application number
PCT/US2013/076532
Other languages
English (en)
Other versions
WO2014105629A3 (fr
Inventor
William L. Carbaugh
Joseph Alan INCAVO
Arturo CABALLERO
Original Assignee
Hydril Usa Manufacturing Llc
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
Priority claimed from US13/897,541 external-priority patent/US20140183381A1/en
Application filed by Hydril Usa Manufacturing Llc filed Critical Hydril Usa Manufacturing Llc
Priority to SG11201505136VA priority Critical patent/SG11201505136VA/en
Priority to EP13821572.8A priority patent/EP2941528A2/fr
Priority to MX2015008573A priority patent/MX2015008573A/es
Priority to CN201380068963.9A priority patent/CN105164364A/zh
Publication of WO2014105629A2 publication Critical patent/WO2014105629A2/fr
Publication of WO2014105629A3 publication Critical patent/WO2014105629A3/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
    • E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams

Definitions

  • the present disclosure relates in general to a variable ram packer for use with a blowout preventer (BOP) mounted on a wellhead. More specifically, the present disclosure relates to a variable ram packer with a packer element having a reinforcement material on its contact surface.
  • BOP blow out preventer
  • BOP stacks that are for shearing the string within the BOP stack, and also for pressure testing within the BOP.
  • flow lines and valves are typically included with BOP stacks to allow fluid flow through the BOP stack for remediating overpressure in the wellbore.
  • variable ram packer For pressure testing within a BOP stack is a variable ram packer.
  • Variable ram packers usually include a pair of hydraulically powered rams on opposing lateral sides of the BOP stack, which are selectively forced radially inward into compressive engagement with the tubular.
  • An elastomer packer element is typically provided with the variable ram packers for engaging the tubular, and has a curved recess on its engaging surface for receiving the tubular. The curved recesses on the pair of packers form a seal in the bore and around the tubular so pressure in the wellbore can be verified.
  • each packer element Adjacent the curved recess, each packer element often has a planar surface that defines an edge at the interface between the recess and planar surface.
  • compressive stresses in the recess transfer to the unsupported edge portion and extrude it outward. Over time, the edge portion is susceptible to damage from these multiple extrusion cycles, especially during exposure to varying low and high temperatures.
  • a variable ram for use with a blowout preventer (BOP) and a method of making.
  • BOP blowout preventer
  • a variable ram is disclosed that includes a ram block selectively moveable within a BOP, and a ram packer disposed in the ram block.
  • the ram packer is made of an elastomer body with a contact surface along one of its lateral sides. A recess portion is provided on a mid-portion of the contact surface; and which projects radially into the body.
  • the recess portion is in selective sealing engagement with a tubular in the BOP, and fibers in the body adjacent the contact surface, so that when the ram block is moved radially inward into sealing contact with the tubular, the fibers exert a force that oppose extrusion of the body.
  • the fibers can be made from a polyester, a polyamide, a cellulose fiber, cotton, para-aramid synthetic fiber, neoprene, nitrile rubber, hydrogenated nitrile rubber, carboxylated nitrile rubber, and combinations thereof.
  • a portion of the contact surface, adjacent an end of the recess portion, is at an angle with respect to the recessed portion; where the angle defines an edge on the contact surface, and wherein the fibers extend adjacent the edge.
  • the fibers comprise can be lateral fibers that extend laterally along the body.
  • the fibers can be axial fibers that extend axially in the body.
  • the fibers are lateral fibers that extend laterally along the body and axial fibers in the body adjacent the contact surface that are generally coplanar with the lateral fibers and oriented at an angle with the lateral fibers.
  • the fibers can be woven into a planar fabric and rubber coated to define a rubberized fabric.
  • at least some of the fibers extend adjacent to one of an upper surface and a lower surface of the body that respectively adjoin opposing upper and lower ends of the contact surface.
  • the elastomer body can be more elastic than the fibers.
  • the elastomer body can be substantially solid.
  • a ram packer assembly for use in a BOP and which includes an elastomeric body selectively disposed in a ram block.
  • the body has a contact surface with a curved recess that selectively seals against a tubular in the BOP.
  • a fabric is integral in the body and adjacent the contact surface. Thus when the body is forced against the tubular, the fabric exerts a force that opposes extrusion of the body.
  • a series of interlocking inserts can be included that selectively slide with respect to one another on a radial surface of the body when the body is radially compressed.
  • the fabric can include fibers made of one or more of a polyester, a polyamide, a cellulose fiber, cotton, para-aramid synthetic fiber, neoprene, nitrile rubber, hydrogenated nitrile rubber, and a carboxylated nitrile rubber.
  • the fabric is provided along an interface between an end of the curved recess and an adjacent planar portion of the contact surface.
  • the portion of the body adjacent the fabric can be stiffer than a portion of the body distal from the fabric.
  • One example of the method includes providing an uncured elastomer and disposing it into a ram packer assembly mold. Fibers are strategically disposed in the mold to be adjacent the contact surface. The uncured elastomer is cured to form a body with the fibers integrally set in the body. Sliding plates are optionally provided in the mold that mount on opposing surfaces of the body.
  • the fibers are made from one of a polyester, a polyamide, a cellulose fiber, cotton, para-aramid synthetic fiber, neoprene, nitrile rubber, hydrogenated nitrile rubber, and combinations thereof. The fibers can be woven into a fabric and coated with an elastomer that adheres with the body.
  • FIG. 1 is a perspective view of an example of a variable ram having an embodiment of a packer element in accordance with an embodiment of the present invention.
  • FIG. 2 is a side partial sectional view of an example of the variable ram of FIG. 1 included in a blowout preventer stack in accordance with an embodiment of the present invention.
  • FIG. 3 is a perspective view of an example of a packer element of FIG. 1 in accordance with an embodiment of the present invention.
  • FIG. 4 is a plan view of an alternate embodiment of the packer element of FIG. 1 in accordance with an embodiment of the present invention.
  • FIG. 5 is a plan view of an example of molding an embodiment of the packer element of FIG. 1 in accordance with an embodiment of the present invention.
  • Figure 1 provides a perspective view of an example embodiment of a variable ram 10, which includes a ram block 12 which houses a ram packer assembly 14.
  • a recess 15 in the ram block 12 is configured to receive the ram packer assembly 14.
  • the recess 15 intersects with a forward facing end of the ram block 12, and extends partially across the width and length of the ram block 12.
  • the ram block 12 is a substantially metallic member that is generally rectangular shaped, and where its length and width exceed its height.
  • a packer element 16 makes up part of the packer assembly 14, which in an example is made at least in part from an elastomeric material. Inserts 18 shown set on an upper radial surface of the packer element 16 and arranged in a semi-circle with its outer radius projecting into the recess 15.
  • Brackets at opposing terminal ends of the semi-circle are coupled to the forward facing end of the packer element 16, but the individual inserts 18 are laterally moveable on the radial surface of the packer element 16. Inserts 18 are interlocked on their respective adjoining edges, but slideable towards one another so the semi-circle compresses when the packer element 16 is laterally compressed.
  • BOP 20 blowout preventer 20 is shown in a side sectional view in Figure 2 and which includes an embodiment of the variable ram 10.
  • the BOP 20 includes a body 21 for housing a pair of variable rams 10; the variable rams 10 can be selectively actuated laterally in and out of body 21.
  • BOP 20 is shown mounted on an upper end of a wellhead housing 22 that anchors on a surface 24, where surface 24 may be subsea or on land.
  • a main bore 26 through wellhead assembly 22 and BOP 20 is shown registering with a wellbore 28 that is being formed through the surface 24 by a drill string 30.
  • the drill string 30 extends through the main bore 26 and the wellbore 28, and includes a drill bit (not shown) on its lower end, that when rotated by drill string 30 excavates wellbore 28.
  • variable rams 10 project radially inward from opposing bodies 21 into sealing engagement with an outer surface of tubular 30. In one example, sealingly engaging the tubular 30 with variable ram allows a pressure test to be performed in wellbore 28.
  • a perspective view of an example of packer assembly 14 is provided in Figure 3 wherein opposing lateral ends of packer assembly 14 are shown angled upward away from an upper radial surface.
  • a contact surface 32 is defined on the side of the packer element 16 that projects outward from the ram block 12 ( Figure 1) and which includes a curvedrecess 34, which can be shaped as semi-circular or semi-elliptical member.
  • the curved recess 34 is shown formed along a mid-portion of the contact surface 32 and projects radially inward and follows a generally curved path with its outer radius set adjacent inner radius of the inserts 18.
  • the contact surface 32 is compressed against outer surface of drill string 30.
  • a reinforcing compound 38 embedded within the body of the packer element 16 and adjacent the contact surface 32.
  • the reinforcing compound 38 is shown made up of individual fibers 39 that extend laterally along at least a portion of the length of the contact surface 32.
  • Optional fibers 39 are shown that extend axially between opposing upper and lower radial surfaces of the packer element 16.
  • reinforcing compound 38 includes only fibers that run either laterally, or vertically, but not both.
  • the reinforcing compound 38 is shown extending over an interface 40 on the contact surface 32 where curved recess 34 transitions into flat 36.
  • interface 40 is defined as an edge where the contact surface 32 angles in a radial direction at the boundary between flat 36 and curved recess 34. Providing the reinforcing compound 38 across the interface 40 further enhances and/or provides an advantage against extrusion of the packer element 16 when set in sealing contact with drill string 30 ( Figure 2).
  • the reinforcing compound 38 is made up of a fabric of the fibers 39.
  • Example materials for the fiber 39 include polyester, nylon, rayon, cotton, polyamide, neoprene, nitrile rubber, hydronated nitrile rubber, carboxylated nitrile rubber, and combinations thereof.
  • the fiber 39 can have an end per inch value of 10x10, 15x15, 20x20, 30x30, and all values there between.
  • Exemplary values for a gauge of the fibers 39 include 0.22 inch, 0.50 inch, 0.10 inch, 0.20 inch, and all values there between.
  • example materials for the packer element 15 include rubber, neoprene, nitrile rubber, hydrogenated nitrile rubber, carboxylated nitrile rubber, natural rubber, butyl rubber, ethylene-propylene rubber,
  • epiclorohydrin chlorosulfunated polyethylene, fluororelastomers, and combinations thereof.
  • Figure 4 illustrates an alternate embodiment of the packer assembly 14 shown in a plan view, wherein the reinforcing compound 38 extends onto the upper radial surface 42. More specifically, in the example of Figure 4, the reinforcing compound extends a distance D from a contact surface 32 of packer assembly 14. Further, the reinforcing compound 38 is provided along substantially all of the curved recess 34 and approximately to a midpoint between terminal ends of the packer assembly 14 along the flat portion 36. Optionally however, embodiments exist wherein the reinforcing compound 38 is concentrated at or adjacent to the interface 40 between the curved recess 34 and flat 36. In another optional embodiment, the reinforcing compound 38 extends along the entire or substantially entire surface of contact surface 32.
  • FIG. 4 Further illustrated in Figure 4 is a rearward surface 44 of the packer assembly 14 that is curved and projects radially outward from the contact surface 32.
  • FIG. 5 One example of forming a packer element 16 is shown in Figure 5.
  • a mold 46 is provided having sidewalls 48 that approximate the outer periphery of the packer element 16 ( Figure 3).
  • an amount of uncured elastomer 50 is provided within the mold 46, and in an amount to substantially fill the mold 46 when cured in the mold.
  • Included with the uncured elastomer 50 is an example of a reinforcing compound 38 shown set along an inside of sidewall 48 adjacent where the contact surface 32 ( Figure 3) will be located on completion of the formation process.
  • the mold 46 is enclosed and subjected to increased temperature and/or pressure for a period of time until the uncured elastomer 50 cures and transforms into the packer element 16.
  • the reinforcing compound 38 Disposing the reinforcing compound 38 along with the uncured elastomer 50 allows the reinforcing compound 38 to be integrally formed with the packer element 16 after the curing process is complete.
  • the reinforcing compound 38 is coated with a material that bonds with the elastomer making up the packer element 16 during the curing process.
  • An elastomer, such as rubber, is one example of a bonding material for coating the reinforcing compound 38.
  • the process illustrated in Figure 5 can in one example create a substantially solid packer element 16. Examples exist wherein the reinforcing compound 38 is formed from a material having a greater stiffness than the material making up packer element 16.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

La présente invention se rapporte à un ensemble mâchoire à ouverture variable destiné à être utilisé dans un bloc d'obturation de puits, ledit ensemble comprenant un élément de garniture d'étanchéité. L'élément de garniture d'étanchéité comprend un corps élastomère qui comporte une surface de contact configurée avec un évidement arrondi destiné à venir en prise de manière étanche avec un élément tubulaire. Des fibres sont incluses dans le corps adjacent aux surfaces de contact qui exercent une force de retenue pour empêcher l'extrusion du corps élastomère lorsqu'il est amené de force contre l'élément tubulaire. Les fibres sont formées d'un seul tenant dans le corps et peuvent être tissées dans un tissu qui est disposé dans un moule d'élément de garniture d'étanchéité conjointement avec un élastomère non durci avant le façonnage du corps. Le tissu peut être recouvert avec un élastomère pour être lié au corps pendant le procédé de façonnage.
PCT/US2013/076532 2012-12-31 2013-12-19 Garniture d'étanchéité de mâchoire à ouverture variable renforcée à l'aide d'un tissu WO2014105629A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SG11201505136VA SG11201505136VA (en) 2012-12-31 2013-12-19 Reinforced variable ram packer using fabric
EP13821572.8A EP2941528A2 (fr) 2012-12-31 2013-12-19 Garniture d'étanchéité de mâchoire à ouverture variable renforcée à l'aide d'un tissu
MX2015008573A MX2015008573A (es) 2012-12-31 2013-12-19 Empujador de empaquetamiento variable reforzado que utiliza telas.
CN201380068963.9A CN105164364A (zh) 2012-12-31 2013-12-19 使用织物的加固可变冲头封隔器

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201261747578P 2012-12-31 2012-12-31
US61/747,578 2012-12-31
US13/897,541 2013-05-20
US13/897,541 US20140183381A1 (en) 2012-12-31 2013-05-20 Reinforced variable ram packer using fabric

Publications (2)

Publication Number Publication Date
WO2014105629A2 true WO2014105629A2 (fr) 2014-07-03
WO2014105629A3 WO2014105629A3 (fr) 2014-12-24

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Country Status (2)

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SG (1) SG11201505136VA (fr)
WO (1) WO2014105629A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016094496A1 (fr) * 2014-12-09 2016-06-16 Hydril USA Distribution LLC Garniture d'étanchéité de piston hydraulique variable ayant des éléments de réduction des contraintes
WO2017095844A1 (fr) * 2015-12-03 2017-06-08 General Electric Company Garniture d'étanchéité de mâchoires d'obturation variables pour bloc obturateur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428592A (en) * 1982-06-07 1984-01-31 Shaffer Charles D Mesh reinforced elastomeric element for oil well components
US4553730A (en) * 1983-08-16 1985-11-19 Vicic John C Ram-type blowout preventer and packer therefor
US20100294482A1 (en) * 2008-02-01 2010-11-25 Cameron International Corporation Variable Bore Packer for a Blowout Preventer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428592A (en) * 1982-06-07 1984-01-31 Shaffer Charles D Mesh reinforced elastomeric element for oil well components
US4553730A (en) * 1983-08-16 1985-11-19 Vicic John C Ram-type blowout preventer and packer therefor
US20100294482A1 (en) * 2008-02-01 2010-11-25 Cameron International Corporation Variable Bore Packer for a Blowout Preventer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016094496A1 (fr) * 2014-12-09 2016-06-16 Hydril USA Distribution LLC Garniture d'étanchéité de piston hydraulique variable ayant des éléments de réduction des contraintes
US9580988B2 (en) 2014-12-09 2017-02-28 Hydril USA Distribution LLC Variable ram packer with strain reduction features
CN107429553A (zh) * 2014-12-09 2017-12-01 海德里尔美国配送有限责任公司 具有应变减少特征的可变闸板封隔器
CN107429553B (zh) * 2014-12-09 2019-10-22 海德里尔美国配送有限责任公司 具有应变减少特征的可变闸板封隔器
WO2017095844A1 (fr) * 2015-12-03 2017-06-08 General Electric Company Garniture d'étanchéité de mâchoires d'obturation variables pour bloc obturateur
US10087698B2 (en) 2015-12-03 2018-10-02 General Electric Company Variable ram packer for blowout preventer

Also Published As

Publication number Publication date
WO2014105629A3 (fr) 2014-12-24
SG11201505136VA (en) 2015-07-30

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