Patent US3770056A successfully refreshed from Google Patents.
US3770056A
Expired / Lapsed
US
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Method of increasing recovery of petroleum from subterranean formations
Assignee: ConocoPhillips Co
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Filing: 1971-07-02
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Granted: 1973-11-06
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Expires: 1991-07-02
Abstract
Abstract Tertiary or secondary waterflood method wherein there is injected into the formation prior to the main aqueous drive fluid a slug of a thickened aqueous solution and a slug of concentrated surfactant solution, said slugs being injected either as a mixture or sequentially.
Inventors
- 👤 D Campbell
- 👤 R Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:39
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; C09K8/588
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
The process of claim 1 wherein the slug of aqueous solution of said polyacrylamide polymer is injected into the formation prior to the slug of aqueous solution of said sulfonate.
Claim 2
Dependent Claim
27 words
The process of claim 1 wherein the slug of aqueous solution of said polyacrylamide polymer and the slug of said sulfonate are mixed prior to being injected.
Claim 3
Dependent Claim
84 words
An oil recovery process following primary production for petroleum-bearing subterranean formations penetrated by a plurality of wells comprising: a. injecting into said formation via an injection well a slug of a thickened aqueous solution, b. injecting into said formation via said injection well a slug of a di-n-alkylbenzene sulfonate surfactant having alkyl groups containing from 11 to 15 carbon atoms, c. injecting into said formation via an injection well a waterflood drive fluid, and d. producing fluids from said formation via a production well.
References Cited (Backward Citations)
US3421582A
Cited
US3446282A
Cited
US3437141A
Cited
US3500921A
Cited
US3527301A
Cited
US3618664A
Cited
US3520365A
Cited
US3638728A
Cited
US3648774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |