US3667545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flooding efficiency with zone boundary plugging
Assignee: Marathon Oil Co
•
Filing: 1970-09-28
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Granted: 1972-06-06
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Expires: 1990-09-28
Abstract
Abstract Injection of an aqueous solution containing a mobility reducing agent into a portion of a highly permeable zone adjacent to a lesser permeable zone is effective to influence zone boundary plugging in a highly stratified reservoir and thereby increase the efficiency of a subsequent micellar flooding process in the highly and/or lesser permeable zone(s). Such reduces or eliminates micellar slug loss to the tighter zones. Thus, a more economical flood can be effected.
Inventors
- 👤 Bruce L Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:02
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; E21B43/00; E21B43/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The process of claim 1 wherein the mobility reducing agent is a partially hydrolyzed, high molecular weight polyacrylamide.
Claim 2
Dependent Claim
28 words
The process of claim 1 wherein the concentration of the mobility reducing agent in the aqueous solution is within the range of about 50 to about 2,000 ppm.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the aqueous medium simultaneously injected into the residue of the highly permeable zone is injected at a rate higher than the aqueous solution containing the mobility reducing agent.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the micellar dispersion is followed by a mobility buffer.
Claim 5
Dependent Claim
24 words
The process of claim 5 wherein a drive water is injected behind the mobility buffer to displace the micellar dispersion toward the production means.
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |