US4828726A
Expired / Lapsed
US
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Stabilizing clayey formations
Assignee: HALLBURTON COMPANY DUNCAN OK A CORP OF
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Filing: 1987-09-11
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Granted: 1989-05-09
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Expires: 2007-09-11
Abstract
Abstract A process for treating clayey geological formations to prevent, inhibit or reduce swelling or migrating clay particles in a formation by treating the formation with an effective amount of a quaternized oligomer which comprises a methyl quaternary amine containing an average of from about 3 to about 6 moles of epihalohydrin. The treatment is effected by introducing the oligomer into the formation in an aqueous fluid which can comprise brine, salt solutions, acid solutions, gelled fluids and the like.
Inventors
- 👤 Ronald E. Himes
- 👤 Edward F. Vinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:06
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/40; C09K8/00; C09K8/02; C09K8/03; C09K8/035; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/933
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A method of stabilizing a clayey geological formation comprising treating the formation with a solution of an aqueous fluid containing an effective amount of a quaternized oligomer having the general formula ##STR3## wherein R 1 is independently hydrogen, alkyl or substituted alkyl wherein the substituent is one or more of hydroxy and amino groups, m+n is equal to an integer or fraction thereof having an average value in the range of from about 3 to about 6, the cationic oligomer has a molecular weight of from about 300 to about 800 and X - is a halide anion to prevent, inhibit or reduce swelling or migrating of clay particles in the formation.
Claim 2
Independent Claim
112 words
A method of stabilizing a clayey geological formation comprising treating the formation with a solution of an aqueous fluid containing an effective amount of a quaternized oligomer having the general formula ##STR3## wherein R 1 is independently hydrogen, alkyl or substituted alkyl wherein the substituent is one or more of hydroxy and amino groups, m+n is equal to an integer or fraction thereof having an average value in the range of from about 3 to about 6, the cationic oligomer has a molecular weight of from about 300 to about 800 and X - is a halide anion to prevent, inhibit or reduce swelling or migrating of clay particles in the formation.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said oligomer is present in said aqueous fluid in an amount of from about 0.01 to about 20 percent by weight of said aqueous fluid.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein said oligomer is present in an amount of from about 0.05 to about 10 percent by weight of said aqueous fluid.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein said aqueous fluid comprises at least one member selected from the group of water, brine, salt solutions, hydrochloric acid, acetic acid, formic acid, hydrofluoric acid and citric acid.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein the formation is traversed by a well bore and the treating is effected during drilling to alleviate swelling of clay.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein said treating is effected during production from a producing formation or injection into a formation to inhibit swelling or dispersing of clay particles.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein said treatment is effected during fracturing or acidizing of said geological formation to prevent, inhibit or reduce swelling or migration of clay particles.
Claim 9
Independent Claim
74 words
A method of stabilizing a clayey geological formation comprising treating the formation with an aqueous solution containing an effective amount of a quaternized oligomer having the general formula ##STR4## wherein m+n equals an integer or fraction thereof having an average value in the range of from about 3 to about 6, the cationic oligomer has a molecular weight in the range of from about 300 to about 800 and X - is a halide.
Claim 10
Independent Claim
74 words
A method of stabilizing a clayey geological formation comprising treating the formation with an aqueous solution containing an effective amount of a quaternized oligomer having the general formula ##STR4## wherein m+n equals an integer or fraction thereof having an average value in the range of from about 3 to about 6, the cationic oligomer has a molecular weight in the range of from about 300 to about 800 and X - is a halide.
Claim 11
Dependent Claim
33 words
The method of claim 8 wherein said methyl quaternary amine is present in said aqueous fluid in an amount of from about 0.05 to about 10 percent by weight of said aqueous fluid.
Claim 12
Dependent Claim
33 words
The method of claim 8 wherein said methyl quaternary amine is present in said aqueous fluid in an amount of from about 0.1 to about 5 percent by weight of said aqueous fluid.
Claim 13
Dependent Claim
29 words
The method of claim 8 wherein said treatment is effected during fracturing or acidizing of said geological formation to prevent, inhibit or reduce swelling or migration of clay particles.
References Cited (Backward Citations)
US2761843A
Cited
US3320317A
Cited
US3349032A
Cited
US3500925A
Cited
US3591520A
Cited
US4366074A
Cited
US4366072A
Cited
US4366073A
Cited
US4366071A
Cited
US4374739A
Cited
US4462718A
Cited
US4158521A
Cited
US4505833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |