US3679000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary oil recovery method using n-sulfohydrocarbon-substituted acrylamide polymers as viscosity increasing agents
Assignee: Lubrizol Corp
•
Filing: 1970-12-04
•
Granted: 1972-07-25
•
Expires: 1990-12-04
Abstract
Abstract Polymers of N-sulfohydrocarbon-substituted acrylamides, especially 2-acrylamido-2-methylpropanesulfonic acid, are useful for controlling the viscosity of aqueous media used in waterflooding operations for secondary petroleum recovery. The preferred polymers are homopolymers and copolymers with acrylic acid or acrylamides.
Inventors
- 👤 Paul Richard Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
19 words
A method according to claim 1 wherein R2 is a lower alkylene or arylene radical and x is 1.
Claim 2
Dependent Claim
37 words
A method according to claim 2 wherein R2 is R3 is hydrogen or a lower alkyl radical, R4 is a lower alkyl radical, and the sulfonic acid group is attached to the unsubstituted methylene carbon of R2.
Claim 3
Dependent Claim
26 words
A method according to claim 3 wherein R1 is hydrogen, each of R3 and R4 is methyl, and M is an alkali metal or ammonium ion.
Claim 4
Dependent Claim
12 words
A method according to claim 4 wherein the polymer is a homopolymer.
Claim 5
Dependent Claim
28 words
A method according to claim 4 wherein the polymer is a copolymer wIth 5-30 percent by weight of acrylic or methacrylic acid or a salt or amide thereof.
Claim 6
Dependent Claim
11 words
A method according to claim 6 wherein the comonomer is acrylamide.
Claim 7
Dependent Claim
104 words
In a method for recovering petroleum from a subterranean petroleum-bearing deposit which comprises injecting a micellar solution comprising water, oil and a surfactant into the area of said deposit through at least one input well, subsequently injecting a mobility buffer comprising water and a minor amount of a viscosity-controlling agent dissolved therein, and finally injecting water to drive said mobility buffer and micellar solution, therefore causing said petroleum to flow from said area for collection through at least one output well, the improvement whereby said viscosity-controlling agent is a water-soluble polymer containing at least 5 percent by weight of repeating units of the formula
Claim 8
Dependent Claim
19 words
A method according to claim 8 wherein R2 is a lower alkylene or arylene radical and x is 1.
Claim 9
Dependent Claim
37 words
A method according to claim 9 wherein R2 is R3 is hydrogen or a lower alkyl radical, R4 is a lower alkyl radical, and the sulfonic acid group is attached to the unsubstituted methylene carbon of R2.
Claim 10
Dependent Claim
26 words
A method according to claim 10 wherein R1 is hydrogen, each of R3 and R4 is methyl, and M is an alkali metal or ammonium ion.
Claim 11
Dependent Claim
12 words
A method according to claim 11 wherein the polymer is a homopolymer.
Claim 12
Dependent Claim
28 words
A method according to claim 11 wherein the polymer is a copolymer with 5-30 percent by weight of acrylic or methacrylic acid or a salt or amide thereof.
Claim 13
Dependent Claim
11 words
A method according to claim 13 wherein the comonomer is acrylamide.
Claim 14
Dependent Claim
26 words
A method according to claim 3 wherein each of R1 and R3 is hydrogen, R4 is methyl, and M is an alkali metal or ammonium ion.
Claim 15
Dependent Claim
26 words
A method according to claim 10 wherein each of R1 and R3 is hydrogen, R4 is methyl, and M is an alkali metal or ammonium ion.
References Cited (Backward Citations)
US3230201A
Cited
US3216962A
Cited
US3282337A
Cited
US3352358A
Cited
US3399725A
Cited
US3406754A
Cited
US3467187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |