US3779916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing composition
Assignee: Schlumberger Technology Corp
•
Filing: 1971-11-04
•
Granted: 1973-12-18
•
Expires: 1991-11-04
Abstract
Abstract An acid-in-oil emulsion having a greatly enhanced retardation rate is prepared by employing in the emulsion a mixture of an effective amount of an oil wetting surfactant, e.g., a saturated hydrocarbon sulfonate, and an emulsifier, e.g., an alkylaryl sulfonic acid or water soluble salt thereof.
Inventors
- 👤 C Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:39
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A composition consisting essentially of: an aqueous acid-in-oil emulsion wherein the oil phase comprises, as percent by volume of the total of both the aqueous acid and oil, from about 5 to about 95 percent and the aqueous acid phase comprises the balance said aqueous acid characterized as reacting with a subterranean calcareous formation, and a total of from about 0.02 to about 10 percent by weight of both water soluble saturated hydrocarbon sulfonate and an alkylaryl sulfonic acid or water soluble salt thereof wherein said saturated hydrocarbon sulfonate corresponds to the formula RSO3X wherein R is a C8 to a C25 aliphatic or cycloaliphatic group and X is an alkali metal or ammonia cation, and the alkylaryl sulfonic acid or water soluble salt thereof corresponds to the formula R1SO3Y wherein R1 is an alkyl substituted benzene or naphthalene wherein the alkyl group is C1 to C25 and Y is one alkali metal, hydrogen or ammonia cation and wherein the weight ratio of RSO3X to R1SO3Y ranges from about 5 to 1 to about 1 to 5 to increase the normal reaction time of said acid-in-oil emulsion.
Claim 2
Dependent Claim
29 words
The composition of claim 2 wherein said oil phase comprises from about 10 to about 50 percent by volume of the total volume of said acid and said oil.
References Cited (Backward Citations)
US1922154A
Cited
US2370421A
Cited
US2802531A
Cited
US2999812A
Cited
US3319714A
Cited
US3353603A
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 |