Patent US3779915A successfully refreshed from Google Patents.
US3779915A
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Acid composition and use thereof in treating fluid-bearing geologic formations
Assignee: Dow Chemical Co
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Filing: 1972-09-21
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Granted: 1973-12-18
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Expires: 1992-09-21
Abstract
Abstract A composition is provided which is especially useful as a fluid loss additive for acidic aqueous solutions. The composition is prepared by first mixing together an emulsifier, an oil soluble surfactant dispersing agent and a carrier oil. Clay particles are then dispersed in the mixture followed by an adhesive binder which functions to bind the clay particles together when screened out on a formation face.
Inventors
- 👤 C Kucera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; C09K8/76; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/933
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
The product of claim 1 wherein the adhesive binder is an ammoniacal protein-stabilized dispersion of rosin, catalytically decarboxylated to have an acid value of not greater than about 200.
Claim 2
Dependent Claim
27 words
The product of claim 1 wherein the emulsifier is the condensation product of a major molar proportion of ethylene oxide and a minor molar proportion of nonylphenol.
Claim 3
Dependent Claim
10 words
The product of claim 1 wherein the clay is bentonite.
Claim 4
Dependent Claim
48 words
An aqueous acid composition comprising: a fluid loss agent consisting essentially of from about 0.5 to about 10 per cent by weight of the product of claim 1 and the balance being an aqueous solution containing from about 5 to about 30 per cent by weight of HCl.
Claim 5
Dependent Claim
24 words
The composition of claim 5 wherein the product of claim 1 comprises from about 1 to about 5 percent by weight of said composition.
Claim 6
Dependent Claim
25 words
A method of acidizing a subterranean formation which is penetrated by a wellbore which comprises contacting said formation with the composition defined in claim 5.
Claim 7
Dependent Claim
19 words
The method of claim 7 wherein said acidizing treatment is carried out under pressure sufficient to fracture said formation.
References Cited (Backward Citations)
US2824833A
Cited
US3153450A
Cited
US3044959A
Cited
US3281354A
Cited
US3179172A
Cited
US3252904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |