Patent US3858652A successfully refreshed from Google Patents.
US3858652A
Expired / Lapsed
US
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Mobility control in low permeability reservoirs
Assignee: Marathon Oil Co
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Filing: 1973-05-14
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Granted: 1975-01-07
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Expires: 1993-05-14
Abstract
Abstract Improved oil recovery from reservoirs having average permeabilities less than 100 md is obtained by injecting into and displacing through the reservoir an aqueous mobility buffer containing an N-sulfohydrocarbon-substituted acrylamide polymer. A micellar solution slug is preferably injected ahead of the buffer slug. This polymer has a reasonably high intrinsic viscosity and permits high injection rates. ''''Plugging'''' of the reservoir is minimal at worst.
Inventors
- 👤 John S Rhudy
- 👤 Bruce L Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:49
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; E; E21; E21B; E21B43/00; E21B43/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
IN A PROCESS OF RECOVERING HYDROCARBON FROM A HYDROCARBON-CONTAINING SUBSTERRANEAN RESERVOIR HAVING AN AVERAGE PERMEABILITY LESS THAN ABOUT 75 MD AND HAVING AN INJECTION MEANS IN FLUID COMMUNICATIONS WITH A PRODUCTION MEANS AND WHEREIN AN AQUEOUS POLYMER SOLUTION IS INJECTED TO RECOVER HYDROCARBON THERETHROUGH, THE IMPROVEMENT COMPRISING USING AS THE AQUEOUS POLYMER SOULTION A SOLUTION COMPRISED OF A POLYMER CONTAINING AT LEAST 5 PERCENT BY WEIGHT OF REPEATING UNITS OF THE FORMULA:
Claim 2
Dependent Claim
72 words
IN A PROCESS OF RECOVERING HYDROCARBON FROM A HYDROCARBON-CONTAINING SUBSTERRANEAN RESERVOIR HAVING AN AVERAGE PERMEABILITY LESS THAN ABOUT 75 MD AND HAVING AN INJECTION MEANS IN FLUID COMMUNICATIONS WITH A PRODUCTION MEANS AND WHEREIN AN AQUEOUS POLYMER SOLUTION IS INJECTED TO RECOVER HYDROCARBON THERETHROUGH, THE IMPROVEMENT COMPRISING USING AS THE AQUEOUS POLYMER SOULTION A SOLUTION COMPRISED OF A POLYMER CONTAINING AT LEAST 5 PERCENT BY WEIGHT OF REPEATING UNITS OF THE FORMULA:
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the concentration of the polymer within the aqueous solution is about 50 to about 2,000 ppm.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein a miscible or miscible-like fluid is injected previous to the injection of the aqueous polymer solution.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the average permeability of the reservoir is less than about 50 md.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein a micellar dispersion is injected previous to the injection of the aqueous polymer solution.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein about 5 to about 150 percent formation pore volume of aqueous polymer solution is injected into the reservoir.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the polymer contains at least about 50 percent by weight of the repeating units.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the polymer contains at least about 80 percent by weight of the repeating units.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein the polymer contains about 100 percent by weight of the repeating units.
Claim 11
Dependent Claim
95 words
In a process of flooding a hydrocarbon-containing subterranean reservoir having an average permability less than about 75 md and having an injection means in fluid communication with a production means and wherein a miscellar dispersion and an aqueous polymer solution are injected therein and displaced toward the production means to recover crude oil therethrough, the improvement comprising injecting about 5 to about 15 percent formation pore volume of an aqueous polymer solution containing about 50 to about 2,000 ppm of a polymer containing at least 5 percent by weight of repeating units of the formula:
Claim 12
Dependent Claim
95 words
In a process of flooding a hydrocarbon-containing subterranean reservoir having an average permability less than about 75 md and having an injection means in fluid communication with a production means and wherein a miscellar dispersion and an aqueous polymer solution are injected therein and displaced toward the production means to recover crude oil therethrough, the improvement comprising injecting about 5 to about 15 percent formation pore volume of an aqueous polymer solution containing about 50 to about 2,000 ppm of a polymer containing at least 5 percent by weight of repeating units of the formula:
Claim 13
Dependent Claim
21 words
The process of claim 10 wherein about 1 to 50 percent formation pore volume of an oil-external micellar dispersion is injected.
Claim 14
Dependent Claim
18 words
The process of claim 10 wherein R2 is a lower alkylene or arylene radical and x is 1.
Claim 15
Dependent Claim
26 words
The process of claim 10 wherein the polymer is a copolymer with 5-30 percent by weight of acrylic or methacrylic acid or salt or amide thereof.
Claim 16
Dependent Claim
19 words
The process of claim 10 wherein the polymer contains at least 50 percent by weight of the repeating units.
Claim 17
Dependent Claim
17 words
The process of claim 10 wherein the polymer contains 100 percent by weight of the repeating units.
References Cited (Backward Citations)
US3613786A
Cited
US3679000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |