US3722591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for insulating and lining a borehole in permafrost
Assignee: ConocoPhillips Co
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Filing: 1971-04-12
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Granted: 1973-03-27
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Expires: 1991-04-12
Abstract
Abstract A borehole penetrating a subterranean region is insulated and lined by hardening in place a hardenable, flowable composition consisting essentially of a hardenable, flowable, adhesive cement and a divided, solid, closed-cell material wherein the closedcell material can comprise as much as about 80 volume percent of the hardenable, flowable composition and wherein the hardened material forming the liner has a hydrostatic crush strength of about 200-5,000 psi, or more. More particularly, syntactic foams are formed in situ to line boreholes penetrating permafrost.
Inventors
- 👤 O Maxson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:21
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; C; C09; C09K; C09K8/00; C09K8/42; Y; Y10; Y10S; Y10S166/00; Y10S166/901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
A method for insulating and lining a borehole penetrating a subterranean region comprising forming a liner in situ by hardening in place a hardenable, flowable composition consisting essentially of a hardenable, flowable, adhesive cement and a divided, solid, closed-cell material, wherein the divided, solid, closed-cell material comprises as much as about 80 volume percent of the hardenable, flowable composition, and wherein the hardened material forming the liner has a hydrostatic crush strength of at least about 200 psi; wherein the hardenable, flowable composition contains about 10 to 60 volume percent of hollow siliceous microspheres whose diameters are in the range of 1 to 1000 microns having wall thicknesses of 0.5 to 10 percent of their diameters, and the remainder comprises a hardenable, flowable, adhesive cement, said hardenable, flowable, adhesive cement comprising a hydraulic cement, an epoxy resin, a phenolformaldehyde resin, a polyurethane resin, or a polysulfide.
Claim 2
Independent Claim
119 words
A method for insulating and lining a borehole penetrating a permafrost region comprising drilling a borehole through the permafrost region, removing extraneous material from the borehole, flowing a hardenable, flowable composition consisting essentially of a hardenable, flowable, adhesive cement and a divided, solid, close-cell material into the borehole filling said borehole, hardening the hardenable, flowable composition in the borehole, and drilling a smaller diameter borehole through the hardened material to complete the formation of the insulating liner in the original borehole; wherein the divided, solid, closed-cell material comprises as much as about 80 volume percent of the hardenable, flowable composition; and wherein the hardened material forming the liner has a hydrostatic crush strength of at least about 200 psi.
Claim 3
Independent Claim
129 words
A method for insulating and lining a borehole penetrating a permafrost region comprising forming a liner in situ by hardening in place to form hardened matter a hardenable, flowable composition consisting essentially of a hardenable, flowable, adhesive cement consisting essentially of an epoxy resin plus a hardening agent plus a divided, solid, closed-cell material; wherein the divided, solid, closed-cell material comprises as much as about 80 volume percent of a hardenable, flowable composition; wherein about 10 to 60 volume percent of the hardenable, flowable composition is hollow, siliceous, microspheres having diameters in the range of 1 to 1000 microns and wall thicknesses of 1 to 5 percent of their diameters; and wherein the hardened matter of the liner has a hydrostatic crush strength of about 200 to 15,000 psig.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |