US3880436A - Ram block - Google Patents

Ram block Download PDF

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Publication number
US3880436A
US3880436A US376562A US37656273A US3880436A US 3880436 A US3880436 A US 3880436A US 376562 A US376562 A US 376562A US 37656273 A US37656273 A US 37656273A US 3880436 A US3880436 A US 3880436A
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United States
Prior art keywords
ram
percent
pipe
work
string
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
US376562A
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English (en)
Inventor
Jose Roberto Canal
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Rucker Co
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Rucker Co
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Filing date
Publication date
Application filed by Rucker Co filed Critical Rucker Co
Priority to US376562A priority Critical patent/US3880436A/en
Priority to AR254428A priority patent/AR204927A1/es
Priority to GB1158874A priority patent/GB1461855A/en
Priority to NL7404961A priority patent/NL7404961A/xx
Priority to FR7414493A priority patent/FR2236126B1/fr
Priority to CA198,237A priority patent/CA998612A/en
Priority to DE2421731A priority patent/DE2421731A1/de
Priority to AT373574A priority patent/AT330704B/de
Priority to IT22361/74A priority patent/IT1010460B/it
Priority to RO7478731A priority patent/RO70582A/ro
Priority to BR5446/74A priority patent/BR7405446D0/pt
Priority to DK359474A priority patent/DK359474A/da
Priority to JP49076530A priority patent/JPS5038602A/ja
Application granted granted Critical
Publication of US3880436A publication Critical patent/US3880436A/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
Assigned to VARCO SHAFFER, INC. reassignment VARCO SHAFFER, INC. ASSIGNS THE ENTIRE RIGHT, TITLE AND INTEREST. SUBJECT TO LICENSE RECITED. Assignors: BAROID TECHNOLOGY, INC.
Expired - Lifetime legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/935—Seal made of a particular material
    • Y10S277/939—Containing metal
    • Y10S277/94—Alloy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12937—Co- or Ni-base component next to Fe-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12944—Ni-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]

Definitions

  • ABSTRACT A ram block for a blowout preventer which can be used successfully in a hydrogen embrittlement environment.
  • the body of the ram block is made of an alloy having an upper hardness level of Rockwell 22 on the C scale (Re 22), and is provided with an inner supporting edge of a soft. relatively stress-free. workhardenable alloy having an upper hardness level of about Rc22 which is capable of rapidly hardening on slight deformation at least about Re 35 and upon engagement with and deformation by a tool joint and the load of the drill or other string of pipe forms a cutting and supporting edge of a hardness level sufficient to bite into the tool joint and support the heavy weight of the drill or other string of pipe.
  • the relatively soft, work-hardenable alloy may be deposited in place by welding and is soft enough to be readily machined to the desired shape.
  • Deep drilling on land and especially offshore has resulted in very high load-carrying requirements for the ram blocks: for example, up to and in excess of 600,000 pounds of load.
  • a hydrogen sulfide environment is encountered which causes hydrogen embrittlement and hence failure of ram-blocks having a strength and hardness level sufficient to support these heavy drill string loads in a non-hydrogen embrit tlement environment.
  • alloy steels not exceeding a hardness level of R022 may be used successfully in hydrogen sulfide environments since these alloys are tough and resist crack propagation and do not become hydrogen embrittled under stresses. Alloys of such a hardness level, however, have a strength and hardness level less than that of the tool joints in the drill string and, accordingly, upon engagement with a tool joint, these alloys are deformed by the tool joints and do not support the heavy drill string load. In order to support the drill string load, it is necessary that the hardness of the supporting edge and tool-engaging part of the ram block exceed the hardness of the tool joints in order to prevent deformation of the supporting portion of the ram blocks and to support the drill string load.
  • Ram blocks made of alloys of Rc45 have a strength and hardness which exceeds the hardness of the tool joints and thus are not deformed by and support the drill string load when engaged by a tool joint; however, such alloys are subject to hydrogen embrittlement when used in a hydrogen sulfide environment, and thus crack and fail under heavy drill string loads.
  • One solution to the problem is to make the ram blocks from exotic metals not subject to hydrogen em brittlement which do have a sufficient level of hardness to bite into the lower tapered shoulder of a tool joint and support the drill string without deformation of the load-supporting upper face of the ram block; for example, A-286, Waspalloy, Inconel, and Rene 41.
  • these metals are extremely expensive.
  • a relatively soft ductile matrix that is, one having an upper hardness level of about Rc22, a hard edge which is harder than the tool joint so that it will bite into the tapered lower end of the tool joint without losing its cutting edge or cutting ability. It would appear that such a hard supporting edge could be mechanically fastened to the ram block or friction welded in place. Hard facing material of sufficient hardness to bite into the tool joint and support the drill string load could be welded on the relatively soft ram block. Such a hard supporting edge or hard facing, however, is subject to hydrogen embrittlement and fail when used in a hydrogen sulfide environment. In addition, hardfacing by welding is difficult to machine and cracks as it is being welded.
  • a ram block having a body of a relatively soft ductile material, that is, having an upper hardness level of Rc22, provided with a supporting inner portion of a relatively soft, work-hardenable alloy, which when relatively stress-free has an upper hardness level of about Rc22 and hence not subject to failure because of hydrogen embrittlement, is easilymachined into the desired shape, and upon energizing the ram blocks to bring them into engagement with the tool joint, rapidly work-hardens sufficiently to indent itself into the tool joint and support the drill string load without substantial deformation.
  • the present invention relates to ram blocks used in blowout preventers which may be used universally, that is, under all conditions, including conditions causing hydrogen embrittlement such as use in hydrogen sulfide environments, but yet when it is necessary to rely on the rams of the blowout preventer to support the drill pipe string, the ram blocks will bite into a tool joint of the drill string and support the drill string load without excessive deformation. More particularly, the present invention relates to such ram blocks which have a metal body having an upper hardness level of about Re22, and hence not subject to failure by hydrogen embrittlement, provided with a relatively soft as deposited hardness which very easily meets the upper hardness level of about Rc22, is easily machinable.
  • a still further object of the present invention is the provision of ram blocks, the body of which is formed of an alloy having an upper a hardness level of about Rc22 and which has a relatively soft supporting edge which rapidly workand strain-hardens upon slight deformation to a hardness level sufficient to bite into a tool joint and support an extremely heavy drill string loadv
  • a still further object of the present invention is the provision of ram blocks for use in blowout preventers which are formed of an alloy having an upper hardness level of about Rc22 and which have supporting inner edges with a stress-free metal which stays in situ until the strength is needed and, by energizing the ram blocks to engage a tool joint, work harden upon slight deformation and indent themselves in the tool joint and have sufficient strength to support the drill string load.
  • Yet a further object of the present invention is the provision of such ram blocks in which a workhardenable surface is deposited about the edge of the ram block to provide a work-hardenable supporting surface for the conditions of use and yet is soft enough when deposited to be readily machined without substantial cracking.
  • a still further object of the present invention is the provision of ram blocks for use in blowout preventers which may be used under all well conditions and which may be manufactured readily, easily and economically.
  • a further object of the present invention is the provision of ram blocks for use in blowout preventers, the body of which is formed of an alloy having an upper hardness level of about R022 and which has a weld deposit of work-hardenable material having an upper hardness level of about R022 and capable upon deformation of work hardening to a hardness level of at least about Rc35, machined to a desirable cutting edge on its inner surface and which upon deformation by engagement with a tool joint and the load of the drill string hardens to a level sufficient to bite into the tool joint of the drill string and to carry the heavy load of the drill string should it become necessary in the course of operation.
  • FIG. 1 is a fragmentary, side view, partly in section, illustrating a blowout preventer having ram blocks according to the present invention shown supporting a drill string by engagement with a tool joint,
  • FIG. 2 is a plan view of one of the ram blocks, sealing rubber and ram holder illustrated in FIG. 1,
  • FIG. 3 is a fragmentary, cross-sectional view taken along the line 3-3 of FIG. 2 and illustrates the workhardenable supporting surface and edge of the ram block,
  • FIG. 4 is a perspective view of one of the ram blocks in FIG. 1,
  • FIG. 5 is a vertical, sectional view of the workhardenable supporting edge of the ram block of FIG. 4,
  • FIG. 6 is a perspective view of another form of ram block having a work-hardenable supporting surface ac cording to the invention
  • FIG. 7 is a fragmentary, vertical sectional view illustrating a ram block having a modified form of workhardenable supporting surface
  • FIG. 8 is a view similar to that of FIG. 7 illustrating a still further modification of the work-hardenable supporting surface
  • FIG. 9 is a view similar to that of FIGS. 7 and 8 illustrating a still further modification of a work-hardenable supporting surface
  • FIG. 10 is a view similar to that of FIGS. 7-9 illustrating a still further embodiment of a work-hardenable supporting surface
  • FIG. 11 is a view similar to that of FIGS. 7-10 illustrating a still further embodiment of a work-hardenable supporting surface on a ram block DESCRIPTION OF PREFERRED EMBODIMENTS
  • a conventional blowout preventer generally indicated by the reference numeral 10
  • the blowout preventer 10 includes a central generally cylindrical body 12 having an enlarged passage 14 which is secured to conductor pipe or casing, not shown, used in drilling an oil or gas well.
  • the blowout preventer 10 includes a pair of ram blocks or ram block assemblies 26 which are actuated to a closed and opened position by ram means, such as the ram shafts 28 movable within the ram bodies 30, normally by a piston, not shown, in the ram piston chamber 32.
  • ram means such as the ram shafts 28 movable within the ram bodies 30, normally by a piston, not shown, in the ram piston chamber 32.
  • the ram blocks are in open position providing a generally unobstructed passage 14, but upon actuation of the ram means the rams close the mating ram blocks 26 about the drill string, as shown in FIG. I.
  • blowout preventer No more description is given or deemed necessary of the blowout preventer and the manner of actuating the rams for opening and closing the ram blocks or ram block assemblies 26 as the ram blocks or ram block assemblies of the present invention may be used with any type of blowout preventer and may be actuated in any desired manner, many of which are well known to and used in the commercial drilling of oil and gas wells.
  • a ram block assembly 26 is illustrated which is here illustrated as composed of three principal parts, a ram block holder 34, the ram block 36, provided with a generally arcuate opening 38, and sealing member 39 fitted between the ram holder 34 and the ram block 36.
  • the upper surface 40 of the ram block 36 has an extending upper guide member 42 and a diametrically opposed upper recessed portion 44 for reception of the guide member on a mating ram block, not shown, making up a pair of ram blocks.
  • the lower face 46 is provided with a similar lower guide member 48 diametrically spaced from the upper guide member 42 and a lower space 50 diametrically spaced from the lower guide member 48 which receives an interfitting guide member, not shown, on the mating ram block of the pair of ram blocks.
  • the sealing member 39 provided on the circumference and the recess portion of the ram block 36 seals the cavity and around the drill pipe 18. This effective seal is provided on actuating of the ram shafts 28 to close the ram blocks 26 together and about the drill pipe 118, illustrated in FIG. I.
  • the ram blocks illus trated in FIGS. 2 and 4, when without a workor strainhardenable inner supporting edge, are commercial ram blocks of Rucker-Shaffer.
  • the ram block may be made up of a series of parts in the form of an assembly or may be one integral piece and may take any desired shape.
  • a ram block 26a is illustrated, which is a commercial ram block available on the market and sold by Cameron Iron Works of Houston, Texas.
  • the reference letter has been added to numerals corresponding to like parts in Figures 1, 2 and 4.
  • the ram block 26a is an integral member and is provided with the recessed portions 44a and 50a to receive a seal member, not shown.
  • ram block assemblies or ram blocks are provided with a generally circular opening, when in closed position, to provide an effective seal about the string of drill or other pipe in the well casing and which, when in open position, permit normal movement and operation of the drill string 16 and tool joints 20.
  • a tool joint such as the tool joint on the string of drill pipe I6, as illustrated in FIG. I, has a hardness level well in excess of Rc22 and, accordingly, if it were necessary to support the heavy load of the drill string. such as weights up to and in excess of 600,00 pounds, by the ram blocks having an upper hardness level of about Rc22, the tool joint 20 would cut into and deform the inner surfaces 38 of the ram blocks 26 and thus would not support the heavy load of the drill string 16.
  • the ram blocks out of a steel alloy having a hardness level exceeding that of the tool joint, for example, Rc35-40, for use in hydrogen sulfide atmospheres because the hydrogen sulfide decomposes when it comes in contact with metal; for example, to form a metal sulfide and to liberate atomic hydrogen which diffuses into the metal lattice.
  • the metal is said to be hydrogen embrittled" when steels absorb hydrogen.
  • brittle failure does occur at stress many times lower than the stress required for failure in the absence of hydrogen.
  • the hydrogen atom diffuses through the grain, tending to gather at the inclusion or other lattice defects.
  • the metal fails in a transgranular mode (across the grain) under the influence of a stress.
  • the absorbed hydrogen tends to gather in the grain boundaries and stress-induced cracking is then intergranular (between the grain).
  • the ram blocks become brittle in the hydrogen sulfide environment and fail when under stress many times lower than the stress required for failure in the absence of hydrogen.
  • the base metal or matrix of the ram block can be made of an alloy having hardness level an upper or one not exceeding about R022 in surface hardness, to avoid stresses higher than the threshold for brittle failure, and be provided with a work-hardenable alloy deposit on its inner surface which, when in a relatively freestress condition has hardness level an upper or one not exceeding about Rc22, but upon slight deformation due to stress the material will rapidly work harden to strength and hardness levels above that of the normal tool joint on a string of drill pipe, for example, to strength and hardness levels of Rc35-40. At these strength and hardness levels, the ram block edge sur face can bite into a normal tool joint and support heavy drill string loads.
  • the ram block is made of a low alloy steel with a controlled hardness preferably in the range of BHN 207235 provided with a relatively soft, inner work-hardenable supporting edge surface.
  • any alloy which will harden on slight deformation and which can be deposited in a rather soft-stressfree deposit that is, under an upper hardness level of about Rc22, is satisfactory in that when put into service in a hydrogen sulfide environment stays in situ until the increase in hardness and strength is needed and consequently does not fail because of hydrogen embrittlement.
  • the chemistry of the deposited alloy is such that the alloy immediately hardens to indent itself into the tool joint and by this action only becomes hard enough to repeatedly cut into a tool joint and to support the drill string load.
  • alloy hardening work hardening
  • strain hardening precipitation hardening
  • work hardenable strain hardenable
  • the as-deposited or welded hardness in relatively stressfree condition of the alloy in Table II was Rb9O (Rockwell B Scale). An average displacement of 0.015 inch increased the hardness to Rc35 and further work hardening increased the hardness to R045 with very little metal displacement.
  • Mn .90%, balance nickel.
  • the as-deposited or welded hardness in relatively stress-free condition of the alloy of Table III was Rb97.
  • An average displacement of 0.020 inch increased the hardness to Rc34.2 and further work hardening increased the hardness to Rc39 with very little metal displacement.
  • Mn l.02%, balance nickel.
  • the as-deposited or welded hardness in relatively stress-free condition of the alloy of Table IV was Rb92.
  • An average displacement of 0.030 inch increased the hardness to Rc34 and further work hardening increased the hardness to Rc41 with very little metal displacement.
  • the shape of the work-hardenable material may take a variety of forms, a number of which are illustrated in the drawings.
  • the work-hardenable deposit 52 is illustrated in cross-section as having a curved base portion 54 with an upper or supporting surface 56 slightly below the upper surface 40 of the ram block 26.
  • FIGS. 5, 7-11 illustrate a variety of shapes for the workor strain-hardenable alloy forming the inner edge supporting surface, in which the reference characters a, 17", c, (1", 0" and f have been added to corresponding reference numerals for convenience of reference.
  • the work-hardenable edge supporting surface 52a is not recessed and has its upper surface 56a flush with the surface 40a of the ram block and is supported by a gently curved base portion 54.
  • FIG. 7 a still different form of work-hardenable insert 52b is illustrated which is provided with an upper surface slightly lower or recessed with respect to the upper surface 50b of the ram block 3612, but provided with a generally rectangular, viewed in cross-section, lower surface 54b.
  • FIG. 8 A still further variation in shape or form of the workhardenable insert 520 is illustrated in FIG. 8 which has a downwardly and inwardly sloping upper surface 560 terminating in the generally horizontal surface 57, a vertical surface 590 extending downwardly and provided with a lower inner surface having a vertical and upwardly extending legs 54c.
  • FIG. 9 A still further variation in form or shape of the workhardenable insert 52d is illustrated in FIG. 9 which has the downwardly and inwardly sloping upper surface 56:! terminating in a generally flat horizontal surface 570' and, when viewed in cross-section, has a generally straight lower surface 540' and upwardly and inclined surface 61d.
  • a still further variation in shape or form of the work-hardenable inner edge insert 52e is illustrated which is generally of a triangular configuration, when viewed in vertical section, provided with the generally flat upper surface 560 level with and forming a continuation of the upper surface 40e of the ram block 26e and having a generally vertical flat side and an angularly disposed lower inner surface 54e which forms what in effect is a base of a triangle when viewed in vertical section.
  • FIG. 11 illustrates a still further modification in the shape or form of the work-hardenable inner supporting insert 52ffor the ram block 26fwhich is here illustrated as having a upper flat surface 56f level with and forming a continuation of the upper surface 49f of the ram block 26f and a vertical surface 59], provided with a generally semi-eliptical inner surface 54f.
  • the work-hardenable inner edge is welded to a machined-out portion of the ram block and then is itself machined to the desired shape.
  • the weld deposit may be one or many passes of weld deposit of the work-hardenable or strain-hardenable material until the desired thickness has been achieved.
  • the proper cutting edge is then machined to the desired shape.
  • the soft workor strain-hardenable material may then be used in a hydrogen embrittlement atmosphere, such as in the presence of hydrogen sulfide, and will not fail due to hydrogen embrittlement.
  • the rams 28 are actuated to bring the ram blocks 26 into engagement with the drill string 18 and its tool joints 20, which upon slight deformation almost instantly and readily work hardens the material to a hardness level sufficient to bite into the shoulder 22 of the tool joint and support the drill string load.
  • the present invention therefore is well suited and adapted to attain the objects and ends and has the advantages and features mentioned as well as others inherent therein.
  • a ram block comprising,
  • a supporting inner edge portion at its arcuate opening formed of a work hardenable alloy of an upper hardness level of about R022 when relatively stressfree and capable of work-hardening to a hardness level of at least about R035 upon deformation, engagement with and deformation by one of the tool joints by the load of the string of pipe work hardening the alloy sufficiently to indent itself into the tool joint.
  • the body portion includes at least one guide member extending from its inner portion and at least one recessed portion for receiving a guide member or members of a mating ram block.
  • the ram block of claim 2 including,
  • sealing means disposed on the ram block for sealingly engaging the string of pipe.
  • the work-hardenable alloy is welded to the upper surface of the arcuate opening, and is machined to shape.
  • a pair of mating ram blocks arranged on opposite sides of the body portion so that when in open position the passageway through the body is open sufficiently to permit passage of the pipe and tool joints in the string of pipe and when in closed position en gage one another to close the passageway through the body,
  • ram means operable to open and close said ram blocks
  • each of said ram blocks comprising a body portion formed of an alloy having an upper hardness level of about Rc22 and provided with an inner arcuate opening, and
  • each of the pair of mating ram blocks has at least one guide member and a mating recess or recesses for receiving the guide member or members of the other arranged so that upon closing the ram blocks the guide member or members or each ram block is received in the recess or recesses of the other of the mating pair of ram blocks thereby guiding the pair of ram blocks into engagement about the tool joint and the string of pipe.
  • seal means on each of the ram blocks arranged to seal the space between engaging faces of the ram blocks and about the string of pipe and between the ram blocks and the body.
  • the work-hardenable alloy is welded to the body portion to provide the upper surface
  • the work-hardenable alloy comprises, by weight,

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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)
  • Earth Drilling (AREA)
  • Arc Welding In General (AREA)
US376562A 1973-07-05 1973-07-05 Ram block Expired - Lifetime US3880436A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US376562A US3880436A (en) 1973-07-05 1973-07-05 Ram block
AR254428A AR204927A1 (es) 1973-07-05 1974-01-01 Bloque de pison
GB1158874A GB1461855A (en) 1973-07-05 1974-03-15 Blowout preventer ram block
NL7404961A NL7404961A (nl) 1973-07-05 1974-04-11 Plungerblok.
FR7414493A FR2236126B1 (de) 1973-07-05 1974-04-25
CA198,237A CA998612A (en) 1973-07-05 1974-04-26 Ram block
DE2421731A DE2421731A1 (de) 1973-07-05 1974-05-04 Preventer und backenblock eines preventers zum angreifen an einem rohrgestaenge
AT373574A AT330704B (de) 1973-07-05 1974-05-06 Preventer
IT22361/74A IT1010460B (it) 1973-07-05 1974-05-07 Blocco a mascella per impianti di trivellazione
RO7478731A RO70582A (ro) 1973-07-05 1974-05-10 Prevenitor de eruptie
BR5446/74A BR7405446D0 (pt) 1973-07-05 1974-07-02 Bloco de embolo calcador
DK359474A DK359474A (de) 1973-07-05 1974-07-04
JP49076530A JPS5038602A (de) 1973-07-05 1974-07-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US376562A US3880436A (en) 1973-07-05 1973-07-05 Ram block

Publications (1)

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US3880436A true US3880436A (en) 1975-04-29

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US376562A Expired - Lifetime US3880436A (en) 1973-07-05 1973-07-05 Ram block

Country Status (13)

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US (1) US3880436A (de)
JP (1) JPS5038602A (de)
AR (1) AR204927A1 (de)
AT (1) AT330704B (de)
BR (1) BR7405446D0 (de)
CA (1) CA998612A (de)
DE (1) DE2421731A1 (de)
DK (1) DK359474A (de)
FR (1) FR2236126B1 (de)
GB (1) GB1461855A (de)
IT (1) IT1010460B (de)
NL (1) NL7404961A (de)
RO (1) RO70582A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2736129A1 (de) * 1976-08-23 1978-03-02 Rucker Co Ausbruchverhueter mit scherbacken zum absperren von bohrquellen
FR2362994A1 (fr) * 1976-08-23 1978-03-24 Rucker Co Blocs-verins destines a fonctionner en milieu d'hydrogene sulfure
US4323256A (en) * 1980-04-30 1982-04-06 Hydril Company Front packer seal for ram blowout preventer
US4540046A (en) * 1983-09-13 1985-09-10 Nl Industries, Inc. Shear ram apparatus
US6296225B1 (en) * 2000-06-29 2001-10-02 Cooper Cameron Corporation Ram bore profile for variable bore packer ram in a ram type blowout preventer
WO2002046485A1 (en) * 2000-12-07 2002-06-13 Centro Sviluppo Materiali S.P.A. Nickel-based alloy composition for high thermal resistance elements, in particular for hot deformation process tools and for high temperature working
US6676103B2 (en) * 2000-09-09 2004-01-13 Elmar Services Limited Wireline centralization apparatus and method
US20200217167A1 (en) * 2019-01-09 2020-07-09 Cameron International Corporation Hang off Ram Preventer
CN111936718A (zh) * 2018-04-06 2020-11-13 海德里美国分销有限责任公司 硬面金属表面和制造方法
CN114016959A (zh) * 2021-11-24 2022-02-08 盐城市祥顺阀业有限公司 采油（气）井口用防盗装置
US12123274B2 (en) 2020-09-16 2024-10-22 Hydril USA Distribution LLC Hardfaced metal surface and method of manufacture

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US6384032B1 (en) 1999-06-17 2002-05-07 Shionogi Bioresearch Corp. Inhibitors of IL-12 production
US6680315B2 (en) 2000-06-15 2004-01-20 Synta Pharmaceuticals Corp. Triazine compounds
EP1689403A4 (de) 2003-11-10 2007-09-05 Synta Pharmaceuticals Corp Heteroaryl-hydrazon-verbindungen

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US2527068A (en) * 1946-05-03 1950-10-24 Cameron Iron Works Inc Ram packing
US2912214A (en) * 1954-03-01 1959-11-10 Cameron Iron Works Inc Blowout preventer
US3434729A (en) * 1965-10-21 1969-03-25 Shaffer Tool Works Ram assembly
US3692316A (en) * 1970-12-21 1972-09-19 Bowen Tools Inc Wireline blowout preventer

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Publication number Priority date Publication date Assignee Title
US2527068A (en) * 1946-05-03 1950-10-24 Cameron Iron Works Inc Ram packing
US2912214A (en) * 1954-03-01 1959-11-10 Cameron Iron Works Inc Blowout preventer
US3434729A (en) * 1965-10-21 1969-03-25 Shaffer Tool Works Ram assembly
US3692316A (en) * 1970-12-21 1972-09-19 Bowen Tools Inc Wireline blowout preventer

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2736129A1 (de) * 1976-08-23 1978-03-02 Rucker Co Ausbruchverhueter mit scherbacken zum absperren von bohrquellen
FR2362994A1 (fr) * 1976-08-23 1978-03-24 Rucker Co Blocs-verins destines a fonctionner en milieu d'hydrogene sulfure
US4081027A (en) * 1976-08-23 1978-03-28 The Rucker Company Shear rams for hydrogen sulfide service
DK151050B (da) * 1976-08-23 1987-10-19 Rucker Co Udblaesningssikring
US4323256A (en) * 1980-04-30 1982-04-06 Hydril Company Front packer seal for ram blowout preventer
US4540046A (en) * 1983-09-13 1985-09-10 Nl Industries, Inc. Shear ram apparatus
US6296225B1 (en) * 2000-06-29 2001-10-02 Cooper Cameron Corporation Ram bore profile for variable bore packer ram in a ram type blowout preventer
US6676103B2 (en) * 2000-09-09 2004-01-13 Elmar Services Limited Wireline centralization apparatus and method
WO2002046485A1 (en) * 2000-12-07 2002-06-13 Centro Sviluppo Materiali S.P.A. Nickel-based alloy composition for high thermal resistance elements, in particular for hot deformation process tools and for high temperature working
CN111936718A (zh) * 2018-04-06 2020-11-13 海德里美国分销有限责任公司 硬面金属表面和制造方法
US11401770B2 (en) * 2018-04-06 2022-08-02 Hydril USA Distribution LLC Hardfaced metal surface and method of manufacture
CN111936718B (zh) * 2018-04-06 2022-08-30 韦特柯格雷有限责任公司 硬面金属表面和制造方法
US20200217167A1 (en) * 2019-01-09 2020-07-09 Cameron International Corporation Hang off Ram Preventer
US11053764B2 (en) * 2019-01-09 2021-07-06 Schlumberger Technology Corporation Hang off ram preventer
US12123274B2 (en) 2020-09-16 2024-10-22 Hydril USA Distribution LLC Hardfaced metal surface and method of manufacture
CN114016959A (zh) * 2021-11-24 2022-02-08 盐城市祥顺阀业有限公司 采油（气）井口用防盗装置

Also Published As

Publication number Publication date
FR2236126A1 (de) 1975-01-31
BR7405446D0 (pt) 1975-04-15
RO70582A (ro) 1982-05-10
DE2421731A1 (de) 1975-01-23
ATA373574A (de) 1975-10-15
CA998612A (en) 1976-10-19
JPS5038602A (de) 1975-04-10
IT1010460B (it) 1977-01-10
FR2236126B1 (de) 1978-05-26
GB1461855A (en) 1977-01-19
DK359474A (de) 1975-02-24
AT330704B (de) 1976-07-12
NL7404961A (nl) 1975-01-07
AR204927A1 (es) 1976-03-19

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