US3554281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable circulating valve insertable in a string of well tubing
Assignee: Pan American Petroleum Corp
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Filing: 1969-08-18
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Granted: 1971-01-12
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Expires: 1989-08-18
Abstract
Abstract A system for use particularly in multiple completion wells to facilitate the use of '''' (pumpdown tools). Two production strings are connected downhole by a crossover port. During normal producing operations the port is closed. When it is desired to use PDT, or pumpdown tools, the crossover port is opened, thereby establishing a circulating path down one string and up the other. The port is opened by merely applying pressure in one of the strings.
Inventors
- 👤 John H Ecuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:03
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
An apparatus to facilitate the use of through-the-flow-line tools in multiple completed wells which comprises: a long string of tubing suspended in a well bore; a short string of tubing suspended in a well bore; a passage downhole between said long string and said short string, said passage having a first port opening into a said long string and a second port opening into said short string; first seat means in said long string below said first port means; a retrievable tool set on said first seat, said retrievable tool permitting unidirectional flow of fluid upwardly therethrough; and said retrievable tool including valve means having a first position and a second position, said valve means when in said first position closing said first port to prevent the communication of fluid between said long string and said short string, and when in said position opening said first port.
Claim 2
Independent Claim
147 words
An apparatus to facilitate the use of through-the-flow-line tools in multiple completed wells which comprises: a long string of tubing suspended in a well bore; a short string of tubing suspended in a well bore; a passage downhole between said long string and said short string, said passage having a first port opening into a said long string and a second port opening into said short string; first seat means in said long string below said first port means; a retrievable tool set on said first seat, said retrievable tool permitting unidirectional flow of fluid upwardly therethrough; and said retrievable tool including valve means having a first position and a second position, said valve means when in said first position closing said first port to prevent the communication of fluid between said long string and said short string, and when in said position opening said first port.
Claim 3
Dependent Claim
108 words
An apparatus as defined in claim 1 in which said retrievable tool includes: a hollow housing member having a port therein opposite said first port of said passage when said body member is seated on said seat means of said long string; and said valve means including: a standing valve in said housing member, said standing valve having a cage and a ball therein, said cage having ports near its upper end; and shearable means holding said standing valve cage in a first position so as to seal said first port, said standing valve cage when in a second position having its port aligned with said first port.
Claim 4
Dependent Claim
25 words
An apparatus as defined in claim 2 including latching dog means between said housing member and the inner wall of said long string of tubing.
Claim 5
Dependent Claim
23 words
An apparatus as defined in claim 3 including a latching groove in the inner wall of said housing member near its upper end.
Claim 6
Dependent Claim
32 words
An apparatus as defined in claim 3 including piston cup means mounted on the upper end of said housing member so that said housing member can be pumped down said long string.
References Cited (Backward Citations)
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Cited
US3130782A
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US3294174A
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US3361206A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |