US3616858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for plugging gas zones with silicone foams
Assignee: Pan American Petroleum Corp
•
Filing: 1970-04-14
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Granted: 1971-11-02
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Expires: 1990-04-14
Abstract
Abstract A special type of silicone is used as a foaming agent for plugging gas zones of oil-bearing formations. The agent is oilsoluble. It forms stable foams with light and heavy oils. It does not form stable emulsions between oil and water. The silicone is of the MQ type.
Inventors
- 👤 Syed H Raza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:42
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; C09K8/518
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
The method of claim 1 in which said resin copolymer is of SiO2 units and (CH3)3 SiO.5 units.
Claim 2
Dependent Claim
26 words
The method of claim 1 in which the concentration of said resin copolymer is between about 0.5 and about 3.0 percent by volume of the solution.
Claim 3
Dependent Claim
18 words
The method of claim 1 in which gas is injected into said formation following the resin copolymer solution.
Claim 4
Dependent Claim
35 words
The method of claim 1 in which the resin copolymer solution is injected into the upper portion of the formation at the same time resin-free oil is injected into the lower portion of said formation.
Claim 5
Dependent Claim
37 words
The method of claim 5 in which gas is injected into the upper portion of said formation following said resin copolymer solution at the same time resin-free oil is injected into the lower portion of said formation.
Claim 6
Dependent Claim
44 words
The method of claim 6 in which a batch of resin-free oil is injected into the upper portion of said formation between said resin copolymer solution and said gas at the same time resin-free oil is injected into the lower portion of said formation.
Claim 7
Independent Claim
163 words
The method of reducing the flow of gas to an oil-producing well from a gas cap in the top of the oil-bearing formation comprising injecting into the upper portion of said formation an oil solution containing at least about 0.1 percent by volume of a benzene-soluble resin copolymer of SiO2 units and (Ch3)3 SiO.5 units, the ratio of (Ch3)3 SiO.5 units to SiO2 units being from 0.6:1 to 0.9:1, inclusive, injecting a batch of resin-free oil into the upper portion of said formation following said resin copolymer solution to displace said resin solution away from said well, injection gas into the upper portion of said formation following said resin-free oil to form foam in said formation with said resin copolymer solution, injecting additional resin-free oil into the lower portion of said formation simultaneously with the injection of said resin copolymer solution, said batch of resin-free oil, and said gas into the upper portion of said formation, and returning the well to oil-producing operations.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |