US4064940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water control with polymers
Assignee: ConocoPhillips Co
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Filing: 1976-11-08
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Granted: 1977-12-27
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Expires: 1996-11-08
Abstract
Abstract A method is provided for reducing the water permeability of a porous subterranean formation by injecting a dispersion of polyamide and a water soluble polymer through a well bore into the formation. Preferred materials are polyamides and poly-acrylamides.
Inventors
- 👤 Derry D. Sparlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:24
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
An improved method of treating a subterranean formation for reducing the flow of aqueous liquids therethrough by injecting a solution of polymer into said formation through a well bore, the improvement comprising injecting a dispersion of a. a thermoplastic or thermosetting cross-linked or non-cross-linked water-insoluble polyamide having recurring amide groups as an integral part of the main polymer chain, together with b. an aqueous solution of a water-soluble polymer, wherein c. the water-insoluble polyamide is dispersed in water in a concentration of from about 10 parts per million (ppm) to 30% by weight and the water soluble polymer in the aqueous solution is in a concentration of from about 100 ppm to about 5,000 ppm based on the total solution.
Claim 2
Dependent Claim
120 words
An improved method of treating a subterranean formation for reducing the flow of aqueous liquids therethrough by injecting a solution of polymer into said formation through a well bore, the improvement comprising injecting a dispersion of a. a thermoplastic or thermosetting cross-linked or non-cross-linked water-insoluble polyamide having recurring amide groups as an integral part of the main polymer chain, together with b. an aqueous solution of a water-soluble polymer, wherein c. the water-insoluble polyamide is dispersed in water in a concentration of from about 10 parts per million (ppm) to 30% by weight and the water soluble polymer in the aqueous solution is in a concentration of from about 100 ppm to about 5,000 ppm based on the total solution.
Claim 3
Dependent Claim
56 words
A method as described in claim 1 wherein the polyamide is selected from the group consisting of polyamides obtained by the condensation of hexamethylene diamine with adipic acid, condensation of hexamethylene diamine with sebacic acid, condensation of sebacic acid with hexamethylene diamine together with a minor amount of alkyl substituted hexamethylene diamine, and polycondensation of caprolactam.
Claim 4
Dependent Claim
54 words
A method as described in claim 1 wherein the water soluble polymer is selected from the group consisting of polyacrylamides, sodium carboxymethylcellulose, carboxyethyl cellulose and carboxymethyl cellulose (CMC), carboxymethyl hydroxyethyl cellulose (CMHEC), hydroxyethyl cellulose, hydroxypropyl cellulose, methylhydroxypropyl cellulose, methyl cellulose, ethyl cellulose, propyl cellulose, ethylcarboxymethyl cellulose, methylethyl cellulose, hydroxypropylmethyl cellulose, Guar gums, and carboxymethylcellulose.
Claim 5
Dependent Claim
51 words
A method as described in claim 1 wherein the dispersion is prepared by dissolving a polyamide in a solvent with heat and agitation until a solution is obtained, a water soluble polymer is dissolved in water or brine with agitation until a solution is obtained, and the two solutions are combined.
Claim 6
Dependent Claim
17 words
A method as described in claim 4 wherein the polyamide dispersion is added to the polyacrylamide solution.
Claim 7
Dependent Claim
25 words
A method as described in claim 4 wherein the ratio of polyacrylamide to polyamide is from about 30 to 1 to about 70 to 1.
References Cited (Backward Citations)
US2815815A
Cited
US3971440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |