US3948783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the secondary and tertiary recovery of petroleum
Assignee: Calgon Corp
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Filing: 1974-04-30
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Granted: 1976-04-06
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Expires: 1994-04-30
Abstract
Abstract Improved secondary and tertiary oil recovery process in which water-soluble, salt-insensitive, block polymers of the A-B-A type wherein the A block is derived from a water-soluble monomer and the B block is derived from N-vinyl pyrrolidone are used as viscosity control agents.
Inventors
- 👤 Miklos Tamas Szabo
- 👤 Lawrence James Guilbault
- 👤 Nancy Spicer Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:39
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A process for the secondary and tertiary recovery of petroleum from subterranean formations penetrated by an injection well and a producing well, which comprises introducing into said reservoir through said injection well a displacing medium comprising water and from about 0.001 to about 1 percent by weight of a block polymer of the formula A-B-A wherein the A block represents from 10 to 100,000 mer units of a water-soluble monomer selected from the group consisting of 3-acrylamido-3-methyl butyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium methosulfate, and acrylamide and the B block represents from 10 to 5,000 mer units of N-vinyl pyrrolidone.
Claim 2
Dependent Claim
113 words
A process for the secondary and tertiary recovery of petroleum from subterranean formations penetrated by an injection well and a producing well, which comprises introducing into said reservoir through said injection well a displacing medium comprising water and from about 0.001 to about 1 percent by weight of a block polymer of the formula A-B-A wherein the A block represents from 10 to 100,000 mer units of a water-soluble monomer selected from the group consisting of 3-acrylamido-3-methyl butyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium methosulfate, and acrylamide and the B block represents from 10 to 5,000 mer units of N-vinyl pyrrolidone.
Claim 3
Dependent Claim
12 words
A process as in claim 1 wherein the water-soluble monomer is acrylamide.
Claim 4
Dependent Claim
15 words
A process as in claim 1 wherein the water-soluble monomer is 2-acrylamido-2-methyl propane sulfonic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |