US3714983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable well packer
Assignee: Schlumberger Technology Corp
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Filing: 1971-09-09
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Granted: 1973-02-06
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Expires: 1991-09-09
Abstract
Abstract In accordance with an illustrative embodiment of the present invention, a retrievable well packer apparatus includes a body structure carrying expansible packing, slip and expander means for anchoring against downward movement, and hydraulically operable gripping means to anchor against upward movement. In the event fluid pressures cannot be equalized in a typical manner to enable release of the packer, the body structure includes a first safety joint means that can be released to enable opening of a pressure equalizing valve means and the operation of tubular telescoping members as a jar or bumper sub. If this fails to release the hydraulically operable gripping means, the body also includes a second safety joint means that can be disconnected to enable release of the pipe string from the packer.
Inventors
- 👤 G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:45
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B17/00; E21B17/02; E21B17/04; E21B17/06; E21B23/00; E21B23/06; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294; E21B33/1295; E21B33/12955
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including tubular telescoping members coupled together by a selectively releasable connection, said body structure further including normally closed valve means that can be opened in response to release of said releasable connection and longitudinal relative movement of said tubular members to equalize said pressure differential and enable retraction of said hydraulic means.
Claim 2
Dependent Claim
95 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including tubular telescoping members coupled together by a selectively releasable connection, said body structure further including normally closed valve means that can be opened in response to release of said releasable connection and longitudinal relative movement of said tubular members to equalize said pressure differential and enable retraction of said hydraulic means.
Claim 3
Dependent Claim
95 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including tubular telescoping members coupled together by a selectively releasable connection, said body structure further including normally closed valve means that can be opened in response to release of said releasable connection and longitudinal relative movement of said tubular members to equalize said pressure differential and enable retraction of said hydraulic means.
Claim 4
Dependent Claim
95 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including tubular telescoping members coupled together by a selectively releasable connection, said body structure further including normally closed valve means that can be opened in response to release of said releasable connection and longitudinal relative movement of said tubular members to equalize said pressure differential and enable retraction of said hydraulic means.
Claim 5
Dependent Claim
31 words
The well packer apparatus of claim 1 further including safety joint means in one of said tubular telescoping members adapted to be released in response to relative rotation of said members.
Claim 6
Dependent Claim
34 words
The well packer apparatus of claim 1 wherein said tubular members have opposed shoulder surfaces adapted to be brought together by said longitudinal relative movement to impart a jarring action to said body structure.
Claim 7
Dependent Claim
52 words
The well packer apparatus of claim 3 further including safety joint means between upper and lower sections of one of said tubular members and clutch means for corotatively coupling said lower section to the other of said members so that said safety joint means can be disconnected in response to relative rotation.
Claim 8
Dependent Claim
143 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including an outer member and an inner member defining an annular cavity therebetween in communication with the well annulus above said packing means, said inner member extending downwardly within said outer member to a point below said hydraulic means; coengageable valve means on said members located above said hydraulic means, said valve means being normally closed to enable the development of a pressure differential across said hydraulic means; and a connection between said members that is releasable in response to relative rotation to enable longitudinal relative movement opening said valve means to equalize a pressure differential across said hydraulic means.
Claim 9
Dependent Claim
143 words
A retrievable well packer apparatus comprising: a body structure carrying packing means for sealing off a well bore and hydraulic means operable in response to a pressure differential for anchoring said body structure against upward movement in a well bore, said body structure including an outer member and an inner member defining an annular cavity therebetween in communication with the well annulus above said packing means, said inner member extending downwardly within said outer member to a point below said hydraulic means; coengageable valve means on said members located above said hydraulic means, said valve means being normally closed to enable the development of a pressure differential across said hydraulic means; and a connection between said members that is releasable in response to relative rotation to enable longitudinal relative movement opening said valve means to equalize a pressure differential across said hydraulic means.
Claim 10
Dependent Claim
73 words
The well packer apparatus of claim 5 wherein said valve means On said inner member is provided by an annular valve head having an upwardly facing shoulder surface aligned for engagement with a downwardly facing shoulder surface on said outer member so that upon release of said connection and opening of said valve means said shoulder surfaces can be brought together by longitudinal relative movement to impart jarring force to said outer member.
Claim 11
Dependent Claim
56 words
The well packer apparatus of claim 6 wherein said inner member has upper and lower sections connected together by safety joint means, and further including means for preventing relative rotation between said lower section and said outer member so that rotation of said upper section with respect thereto can effect release of said safety joint means.
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |