US3799262A
Expired / Lapsed
US
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Method for reducing the flow of water through permeable earth strata
Assignee: Union Oil Company of California
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Filing: 1972-11-16
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Granted: 1974-03-26
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Expires: 1992-11-16
Abstract
Abstract A method for reducing the flow of water through permeable earth strata in which the earth strata is contacted with an aqueous solution containing hydroxyethyl cellulose and a water-soluble substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene. The method can be used to reduce the flow of water through particular strata in communication with a water injection well and to treat producing wells to reduce producing water/oil ratios.
Inventors
- 👤 R Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; E; E21; E21B; E21B43/00; E21B43/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
The method defined in claim 1 wherein said permeable earth formation is penetrated by a water injection well and said aqueous solution is injected through said well and into the formation, and thereafter flood water is injected.
Claim 2
Dependent Claim
44 words
The method defined in claim 1 wherein said permeable earth formation is a petroleum reservoir penetrated by a producing oil and/or gas well and said aqueous solution is injected through said well and into the formation, and thereafter fluids are recovered from said well.
Claim 3
Dependent Claim
25 words
The method defined in claim 3 wherein water is injected after said aqueous solution to displace said aqueous solution from the well into the formation.
Claim 4
Dependent Claim
38 words
The method defined in claim 1 wherein said aqueous solution is injected into said formation in an amount equivalent to about 0.1 to 100 barrels of said solution per foot of vertical thickness of formation to be treated.
Claim 5
Dependent Claim
23 words
The method defined in claim 1 wherein said aqueous solution also contains at least about 2 weight percent of water-soluble alkali metal salts.
Claim 6
Dependent Claim
18 words
The method defined in claim 1 wherein said substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene is characterized by the following generalized formula:
Claim 7
Independent Claim
147 words
A method for treating a water injection well penetrating a permeable earth formation to reduce the flow of water from the well into the more permeable strata of said formation, which comprises: injecting through said well and into the formation about 1 to 1, 000 barrels of an aqueous treating solution per foot of vertical thickness of formation to be treated, said solution containing (1) about 0.05 to 0.5 weight percent of a hydroxyethyl cellulose having about 1 to 3 moles of ethylene oxide substitution per anhydroglucose unit of the cellulose and which is characterized by a Brookfield viscosity of 1,500 to 5, 000 centipoises at 75* F. for A 1 weight percent solution thereof in water, and (2) about 0.05 to 0.3 parts by weight of a substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene per part of hydroxyethyl cellulose, said substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene being characterized by the following generalized formula
Claim 8
Dependent Claim
18 words
The method defined in claim 8 wherein said substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene is a 4,4''-bis(4-(3-sulfoanilino)-6-((bis-2-hydroxyethyl)-amino)-1,3,5-triazin-2 -ylamino)-stilbene-2,2''-disulfonic acid tetrasodium salt.
Claim 9
Dependent Claim
23 words
The method defined in claim 8 wherein said aqueous solution also contains at least about 2 weight percent of water-soluble alkali metal salts.
Claim 10
Independent Claim
140 words
A method for treating a petroleum-bearing formation penetrated by a well to reduce the flow of water from the formation into the well, which comprises: injecting through said well and into the formation about 1 to 1, 000 barrels of an aqueous treating solution per foot of vertical thickness of formation to be treated, said solution containing (1) about 0.05 to 0.5 weight percent of a hydroxyethyl cellulose having about 1 to 3 moles of ethylene oxide substitution per anhydroglucose unit of the cellulose and which is characterized by a Brookfield viscosity of 1,500 to 5, 000 centipoises at 75* F. for a 1 weight percent solution thereto in water, and (2) about 0.05 to 0.3 parts by weight of a substituted poly(hydroxy-alkyl) bis(triazinylamino)stilbene per part of hydroxy-ethyl cellulose, said substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene being characterized by the following generalized formula
Claim 11
Dependent Claim
24 words
The method defined in claim 11 wherein water is injected after said aqueous solution to displace said solution from the well into the formation.
Claim 12
Dependent Claim
17 words
The method defined in claim 11 wherein said substituted poly(hydroxyalkyl) bis(triazinylamino)stilbene is 4,4''-bis(4-(3-sulfoanilino)-6-((bis-2-hydroxyethyl)-amino)-1,3,5-triazin-2 -ylamino)stilbene-2,2''-disulfonic acid tetrasodium salt.
Claim 13
Dependent Claim
23 words
The method defined in claim 11 wherein said aqueous solution also contains at leaSt about 2 weight percent of water-soluble alkali metal salts.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |