US3620304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimum oil recovery for carbon dioxide injection
Assignee: Cities Service Oil Co
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Filing: 1969-12-10
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Granted: 1971-11-16
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Expires: 1989-12-10
Abstract
Abstract Carbon dioxide is injected into a subterranean oil reservoir to maintain a reservoir pressure between about 1 and about 250 p.s.i. above the bubble point pressure of the reservoir crude oil. Under predetermined conditions of temperature and pressure the carbon dioxide miscible gas recovery provides for an extremely efficient displacement of the reservoir crude oil. It has been found that at pressures slightly above the bubble point pressure of the reservoir fluid, the rate of solubility of the carbon dioxide in the reservoir fluid is much higher and recovery of oil is more efficient.
Inventors
- 👤 Charles L Hearn
- 👤 Charles S Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/18; E21B43/164; E21B43/166; E21B43/168
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
25 words
The process of claim 1 further comprising the introduction of the carbon dioxide into a reservoir which has a temperature less tHan about 200* F.
Claim 2
Dependent Claim
35 words
The process of claim 1 further comprising: a. introducing an inert fluid after a slug of carbon dioxide has been formed; and b. driving the carbon dioxide slug through the reservoir with the inert fluid.
Claim 3
Dependent Claim
29 words
The process of claim 3 further comprising the introduction of the carbon dioxide slug and inert fluid into a reservoir which has a temperature less than about 200* F.
References Cited (Backward Citations)
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US2724437A
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US3065790A
Cited
US3084743A
Cited
US3121461A
Cited
US3346046A
Cited
US3480081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |