Patent US3822748A successfully refreshed from Google Patents.
US3822748A
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US
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Petroleum recovery process
Assignee: Texaco Inc
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Filing: 1973-05-04
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Granted: 1974-07-09
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Expires: 1993-05-04
Abstract
Abstract A process for producing petroleum from a subterranean reservoir is provided whereby a solvent equal in density or more dense than water is circulated between upper and lower perforations in a first well in order to dissolve petroleum in an ever-widening volume around the well bore until communication is established to a second well. At this point the production side of the first well is shut in, injection of solvent is ceased, an aqueous fluid is injected into the first well and production is taken from the second well.
Inventors
- 👤 J Allen
- 👤 M Fontaine
- 👤 A Brown
- 👤 J Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:44
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/162
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
A process as in claim 1 wherein the reservoir is a tar sand reservoir.
Claim 2
Dependent Claim
12 words
A process as in claim 2 wherein the solvent comprises carbon disulfide.
Claim 3
Dependent Claim
13 words
A process as in claim 2 wherein the solvent comprises a chlorinated hydrocarbon.
Claim 4
Dependent Claim
19 words
A process as in claim 2 wherein the solvent comprises a mixture of carbon disulfide and a chlorinated hydrocarbon.
Claim 5
Dependent Claim
25 words
A process as in claim 1 wherein the aqueous fluid of step (e) has a temperature sufficient to vaporize the solvent remaining in the reservoir.
Claim 6
Dependent Claim
97 words
A process for producing petroleum from a subterranean reservoir having at least two wells, the first well being open to the reservoir at two places vertically separated and equipped to prevent internal fluid communication between the upper and lower openings, and the second well being open to the reservoir in at least one place comprising : a. cycling a petroleum solvent more dense than water in the first well until fluid communication is established between the first and second wells, b. injecting an aqueous fluid into the first well while petroleum is produced through the second well.
Claim 7
Dependent Claim
14 words
A process as in claim 7 wherein the reservoir is a tar sand reservoir.
Claim 8
Dependent Claim
12 words
A process as in claim 8 wherein the solvent comprises carbon disulfide.
Claim 9
Dependent Claim
13 words
A process as in claim 8 wherein the solvent comprises a chlorinated hydrocarbon.
Claim 10
Dependent Claim
19 words
A process as in claim 8 wherein the solvent comprises a mixture of carbon disulfide and a chlorinated hydrocarbon.
Claim 11
Dependent Claim
25 words
A process as in claim 7 wherein the aqueous fluid of step (b) has a temperature sufficient to vaporize the solvent remaining in the reservoir.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |