US3593798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the permeability of a thief zone
Assignee: Shell USA Inc
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Filing: 1969-05-09
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Granted: 1971-07-20
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Expires: 1989-05-09
Abstract
Abstract A method for obtaining a flat injection profile for a fluid, such as a drive fluid used in an oil recovery operation, that is being injected into an interval of earth formation of nonuniform permeability by contacting the most permeable portions of the interval with a slurry containing a mixture of flexible solid fibers and a fiber-bonding agent, such as sodium silicate or a polyepoxide. An agent to precipitate or gel the bonding agent is then injected.
Inventors
- 👤 Henry C H Darley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
The method of claim 1 wherein the bonding material is sodium silicate and the step of following the suspension by an aqueous liquid containing a substance adapted to put the sodium silicate in a solid phase includes the step of following the suspension by an injection of an aqueous liquid containing calcium chloride.
Claim 2
Dependent Claim
42 words
The method of claim 1 wherein said mixture is a mixture of fibers and polyepoxide in a slug of a nonaqueous fluid which is a solvent in which polyepoxides are partially miscible; and said substance is a curing agent for epoxy resins.
Claim 3
Independent Claim
112 words
A method for treating layers of relatively high permeability located within an interval of a subterranean earth formation of nonuniform permeability, comprising the steps of: making up a slurry of a nonaqueous fluid containing a mixture of particulate asbestos fibers and sodium silicate; injecting and pumping into said highly permeable layers the fluid containing the mixture of particulate asbestos fibers and sodium silicate; injecting and pumping into said layers an aqueous fluid containing a solidifying agent selected from the group consisting of CaCl2 and an acid; and continuing said pumping of said fluids until a compressible porous mat forms on the face of said layers, thereby reducing the permeability of said layers.
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |