US3759281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementing float shoe
Assignee: GRUPUL IND PENTRU FORAJ SI EXT
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Filing: 1971-11-19
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Granted: 1973-09-18
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Expires: 1991-11-19
Abstract
Abstract A float valve for a well casing comprises a fixed ring or seat threaded onto the wall of a generally cylindrical shell and receiving a tubular boss to which the ball cage is threaded. The cylindrical boss and the cage are anchored on the shoe casing by a plurality of shear pins so that they may be dislodged by the application of downward over-pressure in the event the valve becomes plugged. A fluted ring is provided beyond the aforementioned fixed ring to intercept the boss and thereby retain the valve while permitting fluid circulation through the flutes.
Inventors
- 👤 P Falcuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/40; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/1677; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7722; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/7873
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
A float shoe for a well string, comprising an elongated tubular casing adapted to be threaded at an upper end on to said string; a fixed annular seat anchored in said casing at a location above the lower end thereof; a float-valve assembly in force-meeting relationship with said fixed seat and including a detachable annular seat normally received in said fixed seat and having an upwardly facing shoulder bearing against a downwardly facing shoulder formed on said fixed seat, said detachable seat being axially ejectable from said fixed seat in a downward direction, a cage affixed to said detachable seat and extending downwardly therefrom, and a float valve received in said cage; shear pins detachably anchoring said assembly to said casing with said detachable seat received in said fixed seat, said detachable seat being formed with outwardly projecting longitudinal ribs beyond said cage; and a fluted ring anchored in said casing at a location below said assembly when said assembly is held in place by said shear pins, said ring clearing said cage upon dislodgement of said assembly and having inwardly extending ledges intercepting said ribs for supporting said assembly within said casing and permitting fluid flow past said assembly through the flutes of said ring.
Claim 2
Dependent Claim
206 words
A float shoe for a well string, comprising an elongated tubular casing adapted to be threaded at an upper end on to said string; a fixed annular seat anchored in said casing at a location above the lower end thereof; a float-valve assembly in force-meeting relationship with said fixed seat and including a detachable annular seat normally received in said fixed seat and having an upwardly facing shoulder bearing against a downwardly facing shoulder formed on said fixed seat, said detachable seat being axially ejectable from said fixed seat in a downward direction, a cage affixed to said detachable seat and extending downwardly therefrom, and a float valve received in said cage; shear pins detachably anchoring said assembly to said casing with said detachable seat received in said fixed seat, said detachable seat being formed with outwardly projecting longitudinal ribs beyond said cage; and a fluted ring anchored in said casing at a location below said assembly when said assembly is held in place by said shear pins, said ring clearing said cage upon dislodgement of said assembly and having inwardly extending ledges intercepting said ribs for supporting said assembly within said casing and permitting fluid flow past said assembly through the flutes of said ring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |