Patent US3685581A successfully refreshed from Google Patents.
US3685581A
Expired / Lapsed
US
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Secondary recovery of oil
Assignee: Texaco Inc
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Filing: 1971-03-24
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Granted: 1972-08-22
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Expires: 1991-03-24
Abstract
Abstract Promoting secondary recovery of crude petroleum from a subsurface reservoir by flooding the reservoir with a continuous phase liquid admixture of hydrocarbon oil and water under high temperatures and pressures at which the oil dissolves water.
Inventors
- 👤 Howard V Hess
- 👤 Frank E Guptill Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:30
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The method as defined in claim 1 wherein said oil is recovered from a producing well located a substantial distance from said injection well.
Claim 2
Dependent Claim
29 words
The method according to claim 1 wherein said oil is produced from said formation by terminating said injection step and withdrawing oil from said reservoir via the injection well.
Claim 3
Dependent Claim
31 words
The method according to claim 1 wherein said water supplied to the system is a naturally occurring brine and wherein the mineral content of said brine is separated by such extraction.
Claim 4
Dependent Claim
45 words
The method according to claim 1 wherein said complex is brought to said high temperature condition by continuously heating the oil stream and by bringing the feed water stream to complexing temperature by direct contact with the hot oil, such that boiler scaling is obviated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |