US3874634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well safety valve system
Assignee: Otis Engineering Corp
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Filing: 1973-11-07
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Granted: 1975-04-01
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Expires: 1993-11-07
Abstract
Abstract A safety valve system for use in a well having a tubing string for conducting well fluids to the surface, a landing nipple secured in the tubing string for the releasable engagement of a well tool locking mandrel, a sliding sleeve valve connected in the tubing string below the landing nipple and provided with a side port controlled by a sliding sleeve and communicating with a control fluid line extending to the surface, and a safety valve tool string including a locking mandrel releasably supported in the tubing string at the landing nipple, a sleeve shifting device connected with the locking mandrel for opening and closing the sliding sleeve valve when installing and removing the safety valve tool string, and a well safety valve supported from the sleeve shifting device and operable responsive to control fluid pressure introduced into the tubing string through the side port in the sleeve valve. Well safety valves of the ball type, poppet type, and flapper type are disclosed for use in the safety valve tool string. The sliding sleeve valve is opened when the safety valve tool string is introduced into operating position within the tubing string. The sleeve valve is closed when the tool string is removed from the tubing.
Inventors
- 👤 Irme I Gazda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105; E21B34/14; E21B2200/00; E21B2200/04; E21B2200/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
408 words
A sleeve shifter for moVing the valve member of a sliding sleeve valve between open and closed positions comprising: a tubular body mandrel; an outer sleeve secured in concentric spaced relation around said body mandrel, said sleeve having oppositely disposed side slots opening through one end of said sleeve and guide windows between said side slots, said guide windows having a wide first end and a narrow second end; an inner sleeve having one end portion positioned within said outer sleeve between said outer sleeve and said body mandrel, said inner sleeve having outwardly opening side pockets each aligned and connecting with one of said side slots of said outer sleeve, and said inner sleeve having retainer fingers along a second end portion projecting into said side pockets toward said first end portion of said sleeve; an operating key disposed for radial expansion and contraction in each one of said connecting side pockets and slots of said inner and outer sleeves, said keys each having ear portions at one end thereof engaged in said guide windows of said outer sleeve and the other ends of said keys having recesses engageable with said retainer fingers at said second end of said inner sleeve, said keys being movable longitudinally relative to said outer sleeve and said body mandrel with said inner sleeve shifting said ears on said keys from said first wide ends of said guide windows to said second narrow ends of said guide slot for contracting said first ends of said keys radially inwardly to release said keys from a sliding sleeve valve; means between said keys and said body mandrel for biasing said keys radially outwardly; and holding means between said outer and inner sleeves connecting said sleeves together for retaining said inner sleeve at a first position relative to said outer sleeve at which said keys are movable only radially, said holding means being releasable when a force in excess of a predetermined value is applied to said keys toward said second end of said inner sleeve whereby said keys are moved with said inner sleeve away from said first end of said outer sleeve and said ears on said first end of said keys are moved into said narrow portions of said guide windows of said outer sleeve for contracting said keys inwardly along said first end portions of said keys for release of said keys from a valve member of a sliding sleeve valve.
Claim 2
Dependent Claim
408 words
A sleeve shifter for moVing the valve member of a sliding sleeve valve between open and closed positions comprising: a tubular body mandrel; an outer sleeve secured in concentric spaced relation around said body mandrel, said sleeve having oppositely disposed side slots opening through one end of said sleeve and guide windows between said side slots, said guide windows having a wide first end and a narrow second end; an inner sleeve having one end portion positioned within said outer sleeve between said outer sleeve and said body mandrel, said inner sleeve having outwardly opening side pockets each aligned and connecting with one of said side slots of said outer sleeve, and said inner sleeve having retainer fingers along a second end portion projecting into said side pockets toward said first end portion of said sleeve; an operating key disposed for radial expansion and contraction in each one of said connecting side pockets and slots of said inner and outer sleeves, said keys each having ear portions at one end thereof engaged in said guide windows of said outer sleeve and the other ends of said keys having recesses engageable with said retainer fingers at said second end of said inner sleeve, said keys being movable longitudinally relative to said outer sleeve and said body mandrel with said inner sleeve shifting said ears on said keys from said first wide ends of said guide windows to said second narrow ends of said guide slot for contracting said first ends of said keys radially inwardly to release said keys from a sliding sleeve valve; means between said keys and said body mandrel for biasing said keys radially outwardly; and holding means between said outer and inner sleeves connecting said sleeves together for retaining said inner sleeve at a first position relative to said outer sleeve at which said keys are movable only radially, said holding means being releasable when a force in excess of a predetermined value is applied to said keys toward said second end of said inner sleeve whereby said keys are moved with said inner sleeve away from said first end of said outer sleeve and said ears on said first end of said keys are moved into said narrow portions of said guide windows of said outer sleeve for contracting said keys inwardly along said first end portions of said keys for release of said keys from a valve member of a sliding sleeve valve.
Claim 3
Dependent Claim
77 words
A sleeve shifter in accordance with claim 1 wherein each of said operating keys has a tapered cam surface at the end of said key adjacent to said ear portions for engagement with a shoulder surface within the housing of said sliding sleeve valve above the upper end of said sleeve valve for camming said keys inwardly to release said keys from said sliding sleeve valve when said sleeve valve is moved upwardly to a closed position.
Claim 4
Dependent Claim
23 words
A sleeve shifter in accordance with claim 2 wherein said holding means between said outer and inner sleeves comprises a shear pin means.
Claim 5
Dependent Claim
37 words
A sleeve shifter in accordance with claim 2 wherein said operating keys each is provided with spaced downshifting and upshifting shoulders thereon for engaging said sliding sleeve valve to move said valve between open and closed positions.
Claim 6
Dependent Claim
20 words
A sleeve shifter in accordance with claim 2 wherein said operating keys each is provided with an upshifting shoulder only.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |