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US3882939A
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Mobility control in adjacent wellbores
Assignee: Marathon Oil Co
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Filing: 1973-05-14
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Granted: 1975-05-13
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Expires: 1993-05-14
Abstract
Abstract Improved flooding of subterranean reservoirs with an aqueous biopolymer solution is accomplished by incorporating 10-2,000 ppm of a polyalkylene oxide polymer in the front portion, e.g. up to 20 percent of the solution. Without the polyalkylene oxide polymer, the solution exhibits a decrease in viscosity upon increase in shear rate providing unfavorable mobility control. By incorporating polyalkylene oxide polymer, the solution ''''thickens'''' on increased shear rates. This combination provides good mobility control in adjacent wellbores. A miscible or miscible-like displacement slug can precede the aqueous biopolymer slug.
Inventors
- 👤 Richard W Mcatee
- 👤 Marvin A Svaldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:45
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; C; C09; C09K; C09K8/00; C09K8/58; C09K8/588
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
IN A PROCESS OF FLOODING A HYDROCARBON CONTAINING RESERVOIR HAVING AN INJECTION MEANS IN FLUID COMMUNICATION WITH A PRODUCTION MEANS TO RECOVER HYDROCARBON THERETHROUGH, THE TION IS INJECTED INTO THE RESERVOIR AND DISPLACED TOWARD THE PRODUCTION MEANS TO RECOVER HYDROCARBON THERETHROUGH, THE IMPROVEMENT COMPRISING INCORPORATING INTO ONLY THE FRONT PORTION OF THE BIOPOLYMER SOLUTION A POLYALKYLENE OXIDE POLYMER TO OBTAIN IMPROVED MOBILITY CONTROL IN AREAS NEAR THE INJECTION MEANS
Claim 2
Dependent Claim
69 words
IN A PROCESS OF FLOODING A HYDROCARBON CONTAINING RESERVOIR HAVING AN INJECTION MEANS IN FLUID COMMUNICATION WITH A PRODUCTION MEANS TO RECOVER HYDROCARBON THERETHROUGH, THE TION IS INJECTED INTO THE RESERVOIR AND DISPLACED TOWARD THE PRODUCTION MEANS TO RECOVER HYDROCARBON THERETHROUGH, THE IMPROVEMENT COMPRISING INCORPORATING INTO ONLY THE FRONT PORTION OF THE BIOPOLYMER SOLUTION A POLYALKYLENE OXIDE POLYMER TO OBTAIN IMPROVED MOBILITY CONTROL IN AREAS NEAR THE INJECTION MEANS
Claim 3
Dependent Claim
111 words
In a process of recovering hydrocarbon from a hydrocarbon containing subterranean reservoir having an injection means in fluid communication with a production means and wherein an aqueous biopolymer solution is injected into the reservoir and displaced toward the production means to recover hydrocarbon therethrough and wherein the aqueous biopolymer solution exhibits a decrease in viscosity upon increase in shear rate, the improved process comprising incorporating about 100 to about 2,000 ppm of a polyalkylene oxide polymer in the front portion of the aqueous biopolymer solution said front portion comprising up to about 20% of the solution, the effect being to obtain better mobility control in the areas near the injection means.
Claim 4
Dependent Claim
111 words
In a process of recovering hydrocarbon from a hydrocarbon containing subterranean reservoir having an injection means in fluid communication with a production means and wherein an aqueous biopolymer solution is injected into the reservoir and displaced toward the production means to recover hydrocarbon therethrough and wherein the aqueous biopolymer solution exhibits a decrease in viscosity upon increase in shear rate, the improved process comprising incorporating about 100 to about 2,000 ppm of a polyalkylene oxide polymer in the front portion of the aqueous biopolymer solution said front portion comprising up to about 20% of the solution, the effect being to obtain better mobility control in the areas near the injection means.
Claim 5
Dependent Claim
23 words
The process of claim 2 wherein a miscible or miscible-like displacement slug is injected previous to the injection of the aqueous biopolymer solution.
Claim 6
Dependent Claim
24 words
The process of claim 2 wherein about 10 to about 150% formation pore volume of the aqueous biopolymer solution is injected into the reservoir.
Claim 7
Dependent Claim
22 words
The process of claim 4 wherein about 100 to about 2,000 ppm of the biopolymer is admixed into the aqueous biopolymer solution.
Claim 8
Dependent Claim
15 words
The process of claim 2 wherein the polyalkylene oxide polymer is a polyethylene oxide polymer.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |