US3583481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Down hole sidewall tubing valve
Assignee: Pan American Petroleum Corp
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Filing: 1969-09-05
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Granted: 1971-06-08
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Expires: 1989-09-05
Abstract
Abstract A system for use with a well completed with a single string of tubing to facilitate the use of PDT equipment (pump down tools). A special piston operated sleeve valve surrounds and closes a port in the lower end of the string of tubing just above a packer. The port is opened by applying pressure to the annulus between the tubing and the casing. Thus a circulating path is established down the annulus and up the tubing.
Inventors
- 👤 Richard R Vernotzy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:10
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B23/00; E21B23/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
198 words
A system to facilitate the use of pump down tools in a well bore which comprises: a string of tubing suspended in the casing of such well bore; a packer closing the annulus between the lower end of the tubing string and the casing; a tubing port in the tubing string just above the said packer; a valve for closing said tubing port which includes a sleeve stem surrounding said tubing and having a circulating port therein; a piston attached to the upper end of said sleeve stem; housing means including a sleeve stem housing enclosing said sleeve stem and a piston housing surrounding said piston, said sleeve stem housing having a circulating slot adjacent the said tubing port, said circulating port of said sleeve stem when in said sleeve stem''s upper position being aligned with said circulating slot of said sleeve stem housing and with said tubing port, said sleeve stem in its lower position closing said housing port and said tubing port; resilient means in said piston housing urging said piston downwardly; port means in said piston housing below said piston such that pressure of fluid in said annulus applies an upward force to said piston.
Claim 2
Independent Claim
198 words
A system to facilitate the use of pump down tools in a well bore which comprises: a string of tubing suspended in the casing of such well bore; a packer closing the annulus between the lower end of the tubing string and the casing; a tubing port in the tubing string just above the said packer; a valve for closing said tubing port which includes a sleeve stem surrounding said tubing and having a circulating port therein; a piston attached to the upper end of said sleeve stem; housing means including a sleeve stem housing enclosing said sleeve stem and a piston housing surrounding said piston, said sleeve stem housing having a circulating slot adjacent the said tubing port, said circulating port of said sleeve stem when in said sleeve stem''s upper position being aligned with said circulating slot of said sleeve stem housing and with said tubing port, said sleeve stem in its lower position closing said housing port and said tubing port; resilient means in said piston housing urging said piston downwardly; port means in said piston housing below said piston such that pressure of fluid in said annulus applies an upward force to said piston.
Claim 3
Dependent Claim
22 words
A system as defined in claim 1 including a pump down tool seating nipple inside said tubing string above said tubing port.
References Cited (Backward Citations)
US1723993A
Cited
US2251977A
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US2864449A
Cited
US3045759A
Cited
US3193016A
Cited
US3308880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |