Patent US3860067A successfully refreshed from Google Patents.
US3860067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow out preventer
Assignee: Individual
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Filing: 1973-08-10
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Granted: 1975-01-14
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Expires: 1993-08-10
Abstract
Abstract A blow out preventer for producing oil and/or gas wells and comprising a carrier member adapted to be anchored in the well casing at a preselected position below the well tubing and above the uppermost fluid producing subsurface formation. A locking wedge assembly is carried by the carrier member and includes a plurality of slip members hingedly secured to the carrier member selectively engagable with the inner periphery of the well casing. A ram wedge is movably suspended in a normal position below the wedge assembly and hangs from a release knock-out member normally disposed above the carrier member. When a pressure surge occurs in the well casing below the blow out preventer, the ram wedge is moved upwardly into engagement with the wedge assembly for engaging the slips with the outer periphery of the well casing for blocking off the fluid passageway in the well casing and precluding transmitting of the pressure surge to the surface of the well.
Inventors
- 👤 Fletcher Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:00
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1295; E21B23/00; E21B23/04; E21B23/0411; E21B34/00; E21B34/06; E21B34/08; E21B40/00; E21B40/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
204 words
A blow out preventer for fluid producing wells having a well casing disposed therein and comprising a locking wedge assembly disposed within the well casing and selectively engagable therewith, means anchored in the well casing for supporting the locking wedge assembly therein, pressure responsive ram wedge means suspended within the well casing in a normal position with respect to the locking wedge assembly for precluding interference with the normal fluid producing operation of the well and movable to a sealing and locking position with respect to the locking wedge assembly upon a pressure surge in the well casing therebelow, release knock-out means disposed in the well casing above the locking wedge assembly and independently movable with respect thereto for selectively releasing the ram wedge from the sealing engagement with the locking wedge assembly, said locking wedge assembly including a plurality of circumferentially spaced slip members hingedly secured to the anchoring means for alternate radially outward and radially inward movement, said slips being engagable by the ram wedge in one position thereof for radially outward movement into biting engagement with the inner periphery of the well casing to secure the ram wedge in the sealing position during high pressure conditions in the well casing therebelow.
Claim 2
Dependent Claim
204 words
A blow out preventer for fluid producing wells having a well casing disposed therein and comprising a locking wedge assembly disposed within the well casing and selectively engagable therewith, means anchored in the well casing for supporting the locking wedge assembly therein, pressure responsive ram wedge means suspended within the well casing in a normal position with respect to the locking wedge assembly for precluding interference with the normal fluid producing operation of the well and movable to a sealing and locking position with respect to the locking wedge assembly upon a pressure surge in the well casing therebelow, release knock-out means disposed in the well casing above the locking wedge assembly and independently movable with respect thereto for selectively releasing the ram wedge from the sealing engagement with the locking wedge assembly, said locking wedge assembly including a plurality of circumferentially spaced slip members hingedly secured to the anchoring means for alternate radially outward and radially inward movement, said slips being engagable by the ram wedge in one position thereof for radially outward movement into biting engagement with the inner periphery of the well casing to secure the ram wedge in the sealing position during high pressure conditions in the well casing therebelow.
Claim 3
Dependent Claim
52 words
A blow out preventer as set forth in claim 1 wherein said locking wedge assembly also includes yieldable means interposed between the adjacent slip members and bonded thereto, the inner periphery of the locking wedge assembly being downwardly and outwardly tapered for engagement by the ram wedge in said one position thereof.
Claim 4
Dependent Claim
127 words
A blow out preventer as set forth in claim 1 wherein the locking wedge assembly also includes yieldable means interconnected between the slips, each of said slips being provided with longitudinally spaced serrations on the outer periphery thereof for selective engagement with the inner periphery of the well casing, said locking wedge assembly being provided with a downwardly and outwardly tapered inner periphery, and including rod means secured to the ram wedge and slidably secured to the release knock-out means for movably securing said ram wedge in the well casing, said ram wedge being provided with an upwardly and inwardly tapered portion on the outer periphery thereof for engagement with the tapered inner periphery of the locking wedge assembly in said one position of the ram wedge.
Claim 5
Dependent Claim
60 words
A blow out preventer as set forth in claim 1 wherein rod means is carried by the ram wedge and slidably secured to the release knock-out means for slidably suspending the ram wedge in the well casing whereby said ram wedge moves freely upward in the well casing upon a pressure increase therebelow for sealIngly engaging the locking wedge assembly.
Claim 6
Dependent Claim
80 words
A blow out preventer as set forth in claim 1 wherein the locking wedge assembly also includes yieldable means interposed between the slip members and bonded thereto, the outer periphery of each of said slip members being provided with longitudinally spaced serrations for engaging the inner periphery of the well casing in the radially outward position thereof, said locking assembly being provided with a downwardly and outwardly tapered inner periphery engagable by the ram wedge in said one position thereof.
Claim 7
Dependent Claim
52 words
A blow out preventer as set forth in claim 5 wherein the ram wedge is provided with an upwardly and inwardly tapered portion on the outer periphery thereof complementary to the tapered inner periphery of the locking wedge assembly for sealing engagement therewith during high pressure conditions in the well casing therebelow.
References Cited (Backward Citations)
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |