Patent US3945929A successfully refreshed from Google Patents.
US3945929A
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US
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Process for the secondary or tertiary recovery of petroleum
Assignee: Calgon Corp
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Filing: 1974-05-08
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Granted: 1976-03-23
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Expires: 1994-05-08
Abstract
Abstract Use of aminomethylated, water-soluble polymers to maintain or increase solution viscosity of polymer compositions useful in oil recovery processes.
Inventors
- 👤 Fred David Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A process for the secondary or 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 to displace said petroleum from the reservoir, said displacing medium comprising water and an aminomethylated polymer having a molecular weight of at least 200,000, said polymer being selected from the group consisting of polyacrylamide, partially hydrolyzed polyacrylamide and copolymers of acrylamide and 2-acrylamido methyl propane sulfonic acid wherein the amino substituent of the polymer is prepared from amines of the formula: ##EQU2## wherein R 1 and R 2 are each independently selected from alkyl groups having from 1 to 5 carbon atoms in order to increase the solution viscosity of said displacing medium.
Claim 2
Dependent Claim
128 words
A process for the secondary or 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 to displace said petroleum from the reservoir, said displacing medium comprising water and an aminomethylated polymer having a molecular weight of at least 200,000, said polymer being selected from the group consisting of polyacrylamide, partially hydrolyzed polyacrylamide and copolymers of acrylamide and 2-acrylamido methyl propane sulfonic acid wherein the amino substituent of the polymer is prepared from amines of the formula: ##EQU2## wherein R 1 and R 2 are each independently selected from alkyl groups having from 1 to 5 carbon atoms in order to increase the solution viscosity of said displacing medium.
Claim 3
Dependent Claim
11 words
A process as in claim 1 wherein the polymer is polyacrylamide.
Claim 4
Dependent Claim
14 words
A process as in claim 2 wherein the polymer is a partially hydrolyzed polyacrylamide.
Claim 5
Dependent Claim
20 words
A process as in claim 1 wherein the polymer is a copolymer of acrylamide and 2-acrylamido methyl propane sulfonic acid.
Claim 6
Dependent Claim
18 words
A process as in claim 1 which further comprises maintaining the displacing medium in a substantially oxygen-free condition.
Claim 7
Dependent Claim
18 words
A process as in claim 1 wherein the concentration of the polymer is at least 0.0025 weight percent.
Claim 8
Dependent Claim
15 words
A process as in claim 1 wherein the aminomethylated polymer is prepared prior to injection.
Claim 9
Dependent Claim
24 words
A process as in claim 1 wherein the aminomethylated polymer is prepared in the reservoir by coadding the reactants directly to the flooding medium.
References Cited (Backward Citations)
US2328901A
Cited
US3085063A
Cited
US3343601A
Cited
US3539535A
Cited
US3679000A
Cited
US3800877A
Cited
US3850244A
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |