Patent US3777813A successfully refreshed from Google Patents.
US3777813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve for hydraulic control system
Assignee: BP America Production Co
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Filing: 1972-04-24
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Granted: 1973-12-11
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Expires: 1992-04-24
Abstract
Abstract This invention concerns a system using a hydraulic control line to control a downhole safety valve located in a string of tubing suspended in a well bore drilled in the earth. The hydraulic control line is in the space between the tubing string and the casing of the well bore. A special lever actuated valve means is used in the wall of the tubing string at the point where the hydraulic line connects into the tubing string downhole. The insertion of a wireline retrievable safety valve holds the lever actuated valve open. When the safety valve is removed the force of the tubing pressure causes the lever actuated valve to close.
Inventors
- 👤 J Dendy
- 👤 R Johnson
- 👤 R Peevey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:19
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
In a system in which a retrievable safety valve is set in a tubing string in a well bore and is controlled by hydraulic control line extending from a source of controlled hydraulic fluid to a port in the tubing string adjacent the safety valve, the improvement which comprises: a cavity in the wall of said tubing string; said port opening into said cavity; a seat in said port in said cavity; a valve for said seat; first means biasing said valve toward said seat; second means extending into the interior of said tubing string operable to hold said valve away from said seat when said safety valve contacts said second means upon insertion of said safety valve in said tubing string adjacent said cavity.
Claim 2
Dependent Claim
125 words
In a system in which a retrievable safety valve is set in a tubing string in a well bore and is controlled by hydraulic control line extending from a source of controlled hydraulic fluid to a port in the tubing string adjacent the safety valve, the improvement which comprises: a cavity in the wall of said tubing string; said port opening into said cavity; a seat in said port in said cavity; a valve for said seat; first means biasing said valve toward said seat; second means extending into the interior of said tubing string operable to hold said valve away from said seat when said safety valve contacts said second means upon insertion of said safety valve in said tubing string adjacent said cavity.
Claim 3
Dependent Claim
133 words
In a system in which a retrievable safety valve is set in a tubing section in a tubing string in a well bore and controlled by hydraulic control line extending from a source of controlled hydraulic fluid to a port in said tubing section adjacent said safety valve, the improved tubing section comprising: a cavity in said tubing section; a seat in said cavity at the opening of said port; a valve; a pivot in said cavity; a pivoting unit pivotally mounted on said pivot and including (a) an arm which supports said valve at its outer end and (b) a lever, the pivot being between said arm and said lever, said lever extending out of said cavity into the passage of said tubing section when said valve is seated in said seat.
Claim 4
Dependent Claim
133 words
In a system in which a retrievable safety valve is set in a tubing section in a tubing string in a well bore and controlled by hydraulic control line extending from a source of controlled hydraulic fluid to a port in said tubing section adjacent said safety valve, the improved tubing section comprising: a cavity in said tubing section; a seat in said cavity at the opening of said port; a valve; a pivot in said cavity; a pivoting unit pivotally mounted on said pivot and including (a) an arm which supports said valve at its outer end and (b) a lever, the pivot being between said arm and said lever, said lever extending out of said cavity into the passage of said tubing section when said valve is seated in said seat.
Claim 5
Dependent Claim
16 words
The device as defined in claim 2 including means urging said valve toward said valve seat.
Claim 6
Dependent Claim
14 words
A device as defined in claim 3 in which said means is a spring.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |