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US4015995A
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Method for delaying the setting of an acid-settable liquid in a terrestrial zone
Assignee: Chevron USA Inc
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Filing: 1975-08-25
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Granted: 1977-04-05
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Expires: 1995-08-25
Abstract
Abstract In an improved method for the treatment of a permeable formation or zone adjacent to the bore of an oil well, the setting time of an acid-settable liquid is predictably delayed by use of a novel catalyst system. The method provides an effective means for controlling the reduction of the permeability of the formation or zone in a single stage treatment by dissolving the catalyst in the liquid and introducing the solution into the formation. The catalyst system comprises a mixture of a suitable acid-releasing compound and a base.
Inventors
- 👤 Patrick H. Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:14
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C08; C08G; C08G65/00; C08G65/34; C08G65/36; C09K8/60; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
The method of setting an acid-settable liquid which sets at a temperature in the range from about -10° C. to 175° C. at a pH of less than about 5, which comprises dissolving in said liquid in parts by weight an amount of a delayed latent catalyst in the range from about 2 to 20 parts per 100 parts of the liquid, said catalyst being a mixture of a component which releases a strong acid and a basic component wherein the mixture contains an amount of base in the range from 0.02 to 0.98 equivalent per equivalent of releasable strong acid from the acid-releasing component; said liquid being an inorganic liquid selected from the group consisting of inorganic aqueous or alcoholic silicates said basic component being one or more suitable bases selected from the group consisting of organic and inorganic salt-forming bases having a pKb of less than about 13.5; and said acid-releasing component being one or more substantially neutral compounds selected from the group consisting of organic compounds which release a strong acid under solvolytic conditions at a rate in the range of from about 10 - 3 to 10 - 6 equivalent of the acid per liter per minute at said temperature.
Claim 2
Independent Claim
204 words
The method of setting an acid-settable liquid which sets at a temperature in the range from about -10° C. to 175° C. at a pH of less than about 5, which comprises dissolving in said liquid in parts by weight an amount of a delayed latent catalyst in the range from about 2 to 20 parts per 100 parts of the liquid, said catalyst being a mixture of a component which releases a strong acid and a basic component wherein the mixture contains an amount of base in the range from 0.02 to 0.98 equivalent per equivalent of releasable strong acid from the acid-releasing component; said liquid being an inorganic liquid selected from the group consisting of inorganic aqueous or alcoholic silicates said basic component being one or more suitable bases selected from the group consisting of organic and inorganic salt-forming bases having a pKb of less than about 13.5; and said acid-releasing component being one or more substantially neutral compounds selected from the group consisting of organic compounds which release a strong acid under solvolytic conditions at a rate in the range of from about 10 - 3 to 10 - 6 equivalent of the acid per liter per minute at said temperature.
Claim 3
Dependent Claim
17 words
The method as in claim 1 wherein the acid-releasing compounds are free of acid halide substituent groups.
Claim 4
Dependent Claim
163 words
The method as in claim 1 wherein: a. the strong acid is a mineral acid: b. the temperature is in the range from 0° C. to 150° C.; c. the acid-settable liquid sets at a pH which is below 3; d. the liquid contains an amount of the catalyst mixture which is in the range 3 to 6 parts per 100 parts of the liquid; e. the amount of the base in the mixture is in the range from 0.05 to 0.95 equivalent per equivalent of releasing strong acid; f. the acid-releasing compounds are free of acid halides substituent groups, and have a carbon atom content of less than 21; g. the base component is one or more organic compounds which contain basic nitrogen and which have a carbon atom content of less than 21; and h. the rate of release of the strong acid is in the range from about 10 - 4 to 10 - 5 equivalent per liter per minute.
Claim 5
Dependent Claim
112 words
The method as in claim 3 wherein the acid-releasing compounds are selected from the group consisting of: a. compounds of the formula AR(CH 3-y X y ) n , in which AR is a benzene or naphthalene ring, y is 1, 2 or 3, X is a halide selected from the group consisting of chloride, bromide and iodide, and n is 1 or 2; and b. compounds as in (a) in which 1 or 2 of the hydrogen atoms of the ring are replaced by 1 or 2 inert substituents selected from the group consisting of chloride, bromide, alkoxide, NaOSO 2 --, KOSO 2 --, NH 4 OSO 2 , and alkyl.
Claim 6
Dependent Claim
24 words
The method as in claim 1 wherein the acid-releasing compounds(s) are acid halides and the basic component is free of pyridine-type and aromatic amines.
References Cited (Backward Citations)
US3093493A
Cited
US3943084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |