Patent US1402591A successfully refreshed from Google Patents.
Patent US3783944A successfully refreshed from Google Patents.
US3783944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved process for the recovery of oil
Assignee: Dow Chemical Co
•
Filing: 1972-10-05
•
Granted: 1974-01-08
•
Expires: 1992-10-05
Abstract
Abstract Improved oil recoveries, where the reservoir is flooded with a REM (recovery enhancing material) followed by a mobility control polymer, are obtained by either preceding the injection of the REM with a PCA (polymer conserving agent) or incorporating the PCA in a portion of the REM. The PCA, then, preferentially adsorbs onto available adsorption sites within the subterranean reservoir which otherwise would be occupied by the mobility control polymer. Examples of the PCA include polymers and copolymers of, for instance, acrylamide and sodium acrylate. They generally have an average molecular weight within the range of about 2000 to about 500,000.
Inventors
- 👤 R Jennings
- 👤 W Thornton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
29 words
The process of claim 1 wherein, in the formula describing the mobility control polymer, n varies from 0 to about 67 and p varies from 0 to about 33.
Claim 2
Dependent Claim
22 words
The process of claim 1 wherein, in the formula describing the polymer conserving agents, Z varies from about 0.2 to about 60.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the flooding medium comprises water containing from about 0.01 to 0.15 weight percent of the mobility control polymer.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the molecular weight of the mobility control polymer is at least about 2.5 X 106.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the polymer conserving agent comprises water containing from about 0.05 to 5 weight percent of polymer.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the polymer conserving agent is employed at from about 0.5 to 40 percent of the pore volume.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the mobility control polymer is selected from the group:
Claim 8
Dependent Claim
50 words
The process of claim 8 wherein the polymer conserving agent is water containing at least one polymer selected from the group A to D in said claim 8, wherein, in the formulas, Z is greater than about 0.2 but less than about 60, the other variables being as defined therein.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the mobility control polymer is of the formula
Claim 10
Dependent Claim
33 words
The process of claim 1 wherein, in the formula describing the polymer conserving agents, m and p are 0, n is 100 and R'' is H, the other variables being as defined therein.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the recovery enhancing material contains at least about 20 percent by volume of water.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein the recovery enhancing material is an oil-external emulsion, a water-external emulsion, an oil-external micellar dispersion or a water-external micellar dispersion.
Claim 13
Dependent Claim
25 words
The process of claim 1 wherein the recovery enhancing material is a micellar dispersion containing from about 20 to about 94 volume percent of water.
Claim 14
Dependent Claim
71 words
The process of claim 1 wherein the recovery enhancing material is a micellar dispersion containing from at least 4 percent to about 20 percent by volume of a petroleum sulfonate; at least about 20 percent and up to about 94 percent by volume of water; about 2 percent to about 75 percent by volume of hydrocarbon; and, optionally, about 0.1 to about 20 percent by volume or more of a cosurfactant.
References Cited (Backward Citations)
US3039529A
Cited
US3282337A
Cited
US3254714A
Cited
US3476186A
Cited
US3497006A
Cited
US3482632A
Cited
US3523581A
Cited
US3500921A
Cited
US3532166A
Cited
US3679000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |