US3915424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowout preventer with variable inside diameter
Assignee: Hydril LLC
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Filing: 1973-11-05
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Granted: 1975-10-28
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Expires: 1993-11-05
Abstract
Abstract A variable inside diameter blowout preventer capable of sealing off a bore or around an object against high well pressures, and which may be either a ram-type preventer or an annular preventer, and wherein a plurality of anti-extrusion members are disposed for radial and circumferential movement, with the adjacent members overlapping each other, and wherein the anti-extrusion members are interlocked to move together to inhibit or prevent extrusion of a resilient sealing member therewith.
Inventors
- 👤 Robert K Lerouax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:08
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062; F; F16; F16J; F16J15/00; F16J15/16; F16J15/166; F16J15/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
187 words
A blowout preventer adapted to seal with a pipe or other object in a well bore or to close same in the absence of any object in the well bore, comprising: a resilient sealing member having an inner surface adapted to engage a pipe or the like in a well bore; means for urging said sealing member radially inwardly for effecting a seal with a pipe or the like in a well bore or with itself for closing a well bore; first anti-extrusion means mounted with said sealing member and movable circumferentially and radially therewith in response to radial inward movement of said sealing member to a position contacting the pipe or object in the well bore for preventing extrusion of the sealing member longitudinally when fluid pressure acts on said sealing member, said first anti-extrusion means including: a plurality of radially disposed anti-extrusion members mounted for radial movement in response to such movement of said sealing member; and the adjacent ones of said anti-extrusion members having overlapping surfaces, the extent of overlap of which increases as the anti-extrusion members move radially inward with said sealing member.
Claim 2
Dependent Claim
187 words
A blowout preventer adapted to seal with a pipe or other object in a well bore or to close same in the absence of any object in the well bore, comprising: a resilient sealing member having an inner surface adapted to engage a pipe or the like in a well bore; means for urging said sealing member radially inwardly for effecting a seal with a pipe or the like in a well bore or with itself for closing a well bore; first anti-extrusion means mounted with said sealing member and movable circumferentially and radially therewith in response to radial inward movement of said sealing member to a position contacting the pipe or object in the well bore for preventing extrusion of the sealing member longitudinally when fluid pressure acts on said sealing member, said first anti-extrusion means including: a plurality of radially disposed anti-extrusion members mounted for radial movement in response to such movement of said sealing member; and the adjacent ones of said anti-extrusion members having overlapping surfaces, the extent of overlap of which increases as the anti-extrusion members move radially inward with said sealing member.
Claim 3
Dependent Claim
29 words
The blowout preventer set forth in claim 1, wherein: said sealing member is substantially semi-cylindrical and is adapted to be mounted as a part of a blowout preventer ram.
Claim 4
Dependent Claim
14 words
The blowout preventer set forth in claim 1, wherein: said sealing member is annular.
Claim 5
Dependent Claim
80 words
The blowout preventer set forth in claim 1, including: second anti-extrusion means mounted with said sealing member on the opposite side longitudinally of said sealing member from said first anti-extrusion means and movable radially with said sealing member in response to radial inward movement of said sealing member to a position contacting the pipe or object in the well bore for inhibiting extrusion of the sealing member longitudinally when fluid pressure acts on said sealing member from either longitudinal direction.
Claim 6
Dependent Claim
62 words
The structure set forth in claim 4, wherein said second anti-extrusion means includes: a plurality of radially disposed anti-extrusion members mounted for radial movement in response to such movement of said sealing member; and the adjacent ones of said anti-extrusion members having overlapping surfaces, the extent of overlap of which increases as the anti-extrusion members move radially inwardly with said sealing member.
Claim 7
Dependent Claim
25 words
The structure set forth in claim 5, wherein: each of said anti-extrusion members has a first portion thereof which is bonded to said sealing member.
Claim 8
Dependent Claim
37 words
The structure set forth in claim 6, wherein: each of said anti-extrusion members has a second portion which provides with a surface on the adjacent anti-extrusion member said overlapping surfaces which are spaced from said sealing member.
Claim 9
Dependent Claim
31 words
The structure set forth in claim 5, wherein said second anti-extrusion means includes: means for interlocking said second anti-extrusion members together for radial movement together while permitting relative circumferential movement thereof.
Claim 10
Dependent Claim
25 words
The structure set forth in claim 1, wherein: each of said anti-extrusion members has a first portion thereof which is bonded to said sealing member.
Claim 11
Dependent Claim
37 words
The structure set forth in claim 9, wherein: each of said anti-extrusion members has a second portion which provides with a surface on the adjacent anti-extrusion member said overlapping surfaces which are spaced from said sealing member.
Claim 12
Dependent Claim
24 words
The structure set forth in claim 1, including: means for interlocking said anti-extrusion members for radial movement together whilE permitting relative circumferential movement thereof.
Claim 13
Dependent Claim
80 words
The structure set forth in claim 1, wherein said first anti-extrusion means includes: a plurality of radially disposed anti-extrusion members disposed in a ring and movable circumferentially relative to each other as they move radially together; each of said members having a lower section and an upper section in a stair-stepped configuration, with the lower section bonded to said sealing member, and with said upper section disposed away from the sealing member and slidably engaged with the adjacent anti-extrusion member.
Claim 14
Dependent Claim
47 words
The structure set forth in claim 12, wherein each anti-extrusion member includes: an interlocking recess formed on the upper portion of said lower section; and an interlocking lug formed with said upper section and adapted to slidably interfit with the interlocking recess on the adjacent anti-extrusion member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |