US3661208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of gravity segregation by high density fluid injection
Assignee: Cities Service Oil Co
•
Filing: 1970-06-02
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Granted: 1972-05-09
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Expires: 1990-06-02
Abstract
Abstract Gravity segregation is controlled and oil recovery enhanced by the controlled injection of a high density miscible fluid, such as carbon dioxide, into an oil bearing formation. Pressure within the formation is maintained so that the density of the injected fluid is equal to or as close to that of the oil as possible. Generally, the density of the miscible fluid should be maintained within about 10 percent of the density of the oil to be displaced. Mixtures of the miscible fluid and displaced oil are produced from the lower portions of the reservoir so that the miscible fluid will sweep the entirety of the reservoir and thereby avoid bypassing oil by gravity segregation of oil and miscible fluid.
Inventors
- 👤 J O Scott
- 👤 Charles L Hern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/166; E21B43/168
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
The process of claim 1 in which the density of the miscible fluid is maintained within about 10 percent of the density of the reservoir oil.
Claim 2
Dependent Claim
13 words
The process of claim 1 in which the miscible fluid is carbon dioxide.
Claim 3
Dependent Claim
26 words
The process of claim 1 further comprising subsequently injecting a driving fluid, other than the miscible fluid, into the injection well while maintaining said reservoir pressure.
Claim 4
Dependent Claim
19 words
The process of claim 4 in which the miscible fluid is carbon dioxide and the driving fluid is water.
Claim 5
Dependent Claim
22 words
The process of claim 5 in which the miscible fluid and reservoir oil are produced from the lower portion of the reservoir.
Claim 6
Dependent Claim
19 words
The process of claim 1 in which the miscible fluid is injected into the upper portion of the reservoir.
References Cited (Backward Citations)
US24873A
Cited
CA664186A
Cited
US2623596A
Cited
US2875830A
Cited
US2878874A
Cited
US3003554A
Cited
US3240272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |