Patent US2637680A successfully refreshed from Google Patents.
Patent US3880436A successfully refreshed from Google Patents.
US3880436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ram block
Assignee: Rucker Co
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Filing: 1973-07-05
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Granted: 1975-04-29
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Expires: 1993-07-05
Abstract
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 (Rc 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 Rc 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. A number of embodiments and examples of the invention is disclosed.
Inventors
- 👤 Jose Roberto Canal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:01
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939; Y10S277/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12937; Y10T428/12944; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A ram block comprising, a body portion formed of an alloy having an upper hardness level of about Rc22 and having an arcuate opening at its inner portion for engaging pipe and tool joints in a string of pipe, and a supporting inner edge portion at its arcuate opening formed of a work hardenable alloy of an upper hardness level of about Rc22 when relatively stressfree and capable of work-hardening to a hardness level of at least about Rc35 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.
Claim 2
Dependent Claim
111 words
A ram block comprising, a body portion formed of an alloy having an upper hardness level of about Rc22 and having an arcuate opening at its inner portion for engaging pipe and tool joints in a string of pipe, and a supporting inner edge portion at its arcuate opening formed of a work hardenable alloy of an upper hardness level of about Rc22 when relatively stressfree and capable of work-hardening to a hardness level of at least about Rc35 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.
Claim 3
Dependent Claim
39 words
The ram block of claim 1 where, 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.
Claim 4
Dependent Claim
21 words
The ram block of claim 2 including, sealing means disposed on the ram block for sealingly engaging the string of pipe.
Claim 5
Dependent Claim
25 words
The ram block of claim 1 where, the work-hardenable alloy is welded to the upper surface of the arcuate opening, and is machined to shape.
Claim 6
Dependent Claim
202 words
In a blowout preventor for sealing off and engaging pipe and tool joints in a string of pipe, a generally cylindrical body portion arranged to be connected to casing through which the string of pipe passes, 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 engage 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 a supporting inner edge of the arcuate portion formed of a work-hardenable alloy of an upper hardness level of about Rc22 when relatively stress-free and capable of hardening to a hardness level of at least about Rc35 upon deformation, engagement with and deformation by one of the tool joints caused by the load of the string of pipe work hardening the alloy sufficiently to indent itself into the tool joint.
Claim 7
Dependent Claim
202 words
In a blowout preventor for sealing off and engaging pipe and tool joints in a string of pipe, a generally cylindrical body portion arranged to be connected to casing through which the string of pipe passes, 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 engage 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 a supporting inner edge of the arcuate portion formed of a work-hardenable alloy of an upper hardness level of about Rc22 when relatively stress-free and capable of hardening to a hardness level of at least about Rc35 upon deformation, engagement with and deformation by one of the tool joints caused by the load of the string of pipe work hardening the alloy sufficiently to indent itself into the tool joint.
Claim 8
Dependent Claim
88 words
The invention of claim 5 where, 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.
Claim 9
Dependent Claim
40 words
The invention of claim 6 including, 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.
Claim 10
Dependent Claim
25 words
The invention of claim 5 where, the work-hardenable alloy is welded to the body portion to provide the upper surface, and is machined to shape.
Claim 11
Dependent Claim
73 words
The ram block of claim 1 where, the work-hardenable alloy comprises, by weight, from about 0 to about 0.10 percent carbon, from about 8 to about 20 percent chromium, from about 10 to about 20 percent molybdenum, from about 2 to about 6 percent tungsten, from about 0 to about 10 percent iron, up to about 1.2 percent silicon, up to about 1.5 percent manganese, from about 41 to about 78 percent nickel.
Claim 12
Dependent Claim
72 words
The invention of claim 8 where the work-hardenable alloy comprises, by weight, from about 0 to about 0.10 percent carbon, from about 8 to about 20 percent chromium, from about 10 to about 20 percent molybdenum, from about 2 to about 6 percent tungsten, from about 0 to about 10 percent iron, up to about 1.2 percent silicon, up to about 1.5 percent manganese, from about 41 to about 78 percent nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |