US3926259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for normalizing stresses and strains in a well casing in a permafrost zone
Assignee: Atlantic Richfield Co
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Filing: 1975-03-31
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Granted: 1975-12-16
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Expires: 1995-03-31
Abstract
Abstract A method for rendering stresses and strains in a well casing more uniform throughout the length of the casing in a permafrost zone, the permafrost adjacent the casing being at least partially thawed, wherein the permafrost is allowed to refreeze at least in part until the well casing can physically move relative to the thawed soil thereby rendering such stresses and strains more uniform throughout the casing length.
Inventors
- 👤 Thomas K Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A METHOD FOR RENDERING STRESSES AND STRAINS MORE UNIFORM THROUGHOUT A LENGTH OF WELL CASING THAT IS ADJACENT AN AT LEAST PARTIALLY THAWED PERMAFROST ZONE, SAID THAWED ZONE CONTAINING THAWED SOIL AND LIQUID IN THE PORES THEREOF, SAID THAWING HAVE ING BEEN CAUSED BY ONE OR MORE WELL OPERATIONS, SAID METHOD COMPRISING AT LEAST LIMITING SAID WELL OPERATIONS SO THAT REFREEZING CAN OCCUR IN AT LEAST PART OF SAID THAWED ZONE, ALLOWING SAID REFREEZING TO OCCUR IN SAID THAWED ZONE UNTIL SAID
Claim 2
Independent Claim
82 words
A METHOD FOR RENDERING STRESSES AND STRAINS MORE UNIFORM THROUGHOUT A LENGTH OF WELL CASING THAT IS ADJACENT AN AT LEAST PARTIALLY THAWED PERMAFROST ZONE, SAID THAWED ZONE CONTAINING THAWED SOIL AND LIQUID IN THE PORES THEREOF, SAID THAWING HAVE ING BEEN CAUSED BY ONE OR MORE WELL OPERATIONS, SAID METHOD COMPRISING AT LEAST LIMITING SAID WELL OPERATIONS SO THAT REFREEZING CAN OCCUR IN AT LEAST PART OF SAID THAWED ZONE, ALLOWING SAID REFREEZING TO OCCUR IN SAID THAWED ZONE UNTIL SAID
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said well operations are the drilling of said well.
Claim 4
Dependent Claim
18 words
A method according to claim 1 wherein said well operations are the production of fluids from said well.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said well operations are a combination of drilling said well and producing fluids therefrom.
Claim 6
Dependent Claim
31 words
A method according to claim 1 wherein said refreezing is allowed to occur until the liquid pore pressure in said thawed zone approaches the pressure transmitted by the thawed soil itself.
Claim 7
Dependent Claim
35 words
A method according to claim 1 wherein said refreezing is allowed to occur until the liquid pore pressure in said thawed zone is at least equal to the pressure transmitted by the thawed soil itself.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein said casing has cement disposed between it and said thawed zone.
References Cited (Backward Citations)
US3820605A
Cited
US3830303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |