US3917535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous based emulsion for treating subterranean formations
Assignee: Schlumberger Technology Corp
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Filing: 1973-01-12
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Granted: 1975-11-04
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Expires: 1993-01-12
Abstract
Abstract An improved composition and method for acidizing hydrocarbon producing subterranean formations is provided. An acidizing composition comprising an aqueous acid solution which reacts with at least a portion of the formation and having dispersed therein an acid insoluble essentially aromatic free organic liquid having a viscosity of at least about 5 centipoise and a water-wetting surfactant is introduced into the formation. This particular composition increases the acid penetration distance within the formation.
Inventors
- 👤 Curtis W Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:07
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/27; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; Y; Y10; Y10S; Y10S507/00; Y10S507/905; Y10S507/933
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A METHOD OF FRACTURING A SUBTERRANEAN GEOLOGIC FORMATIONS WHICH COMPRISES: INJECTING A SUFFICIENT QUANTITY OF AN AQUEOUS ACID BASED EMULSION INTO THE FORMATION TO FRACTURE SAID FORMATION, SAID AQUEOUS ACID BASED EMULSION COMPRISING AS THE EXTERNAL PHASE AN AQUEOUS ACID SOLUTION IN WHICH AT LEAST A PORTION OF THE FORMATION IS SOUBLE, AS THE INTERNAL PHASE FROM ABOUT 20 TO ABOUT 50 PER CENT BY VOLUME OF AN ORGANIC LIQUID HAVING A VISCOSITY OF FROM ABOUT 5 TO ABOUT 10,000 CENTIPOISE AT A TEMPERATURE OF ABOUT 75*F AND CONTAINING LESS THAN ABOUT 20 PER CENT BY WEIGHT OF AROMATICS, AND A WATER-WETTING SURFACTANT.
Claim 2
Independent Claim
103 words
A METHOD OF FRACTURING A SUBTERRANEAN GEOLOGIC FORMATIONS WHICH COMPRISES: INJECTING A SUFFICIENT QUANTITY OF AN AQUEOUS ACID BASED EMULSION INTO THE FORMATION TO FRACTURE SAID FORMATION, SAID AQUEOUS ACID BASED EMULSION COMPRISING AS THE EXTERNAL PHASE AN AQUEOUS ACID SOLUTION IN WHICH AT LEAST A PORTION OF THE FORMATION IS SOUBLE, AS THE INTERNAL PHASE FROM ABOUT 20 TO ABOUT 50 PER CENT BY VOLUME OF AN ORGANIC LIQUID HAVING A VISCOSITY OF FROM ABOUT 5 TO ABOUT 10,000 CENTIPOISE AT A TEMPERATURE OF ABOUT 75*F AND CONTAINING LESS THAN ABOUT 20 PER CENT BY WEIGHT OF AROMATICS, AND A WATER-WETTING SURFACTANT.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said aqueous acid phase comprises an acidic solution which is reactive with said formation to be fractured.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said organic liquid has a viscosity ranging from about 25 to about 2,000 centipoise.
Claim 5
Independent Claim
95 words
A METHOD OF INCREASING THE PERMEABILITY OF A SUBTERRANEAN GEOLOGIC FORMATION WHICH COMPRISES: CONTACTING SAID FORMATION WITH AN EMULSION COMPRISING AN ORGANIC LIQUID, A WATER-WETTING SRFACTANT, AND AN AQUEOUS ACID SOLUTION WHICH IS REACTIVE WITH SAID FORMATION TO DISSOLVE AWAY A PORTION OF SAID FORMATION, SAID AQUEOUS ACID SOLUTION COMPRISING THE EXTERNAL PHASE, AND SAID ORGANIC LIQUID HAS A VISCOSITY RANGING FROM ABOUT 5 TO ABOUT 10.000 CENTIPOISE, CONTAINS LESS THAN ABOUT 20 PER CENT BY WEIGHT OF AROMATICS AND COMPRISES FROM ABOUT 20 TO ABOUT 50 PER CENT BY VOLUME OF THE EMULSION .
Claim 6
Independent Claim
95 words
A METHOD OF INCREASING THE PERMEABILITY OF A SUBTERRANEAN GEOLOGIC FORMATION WHICH COMPRISES: CONTACTING SAID FORMATION WITH AN EMULSION COMPRISING AN ORGANIC LIQUID, A WATER-WETTING SRFACTANT, AND AN AQUEOUS ACID SOLUTION WHICH IS REACTIVE WITH SAID FORMATION TO DISSOLVE AWAY A PORTION OF SAID FORMATION, SAID AQUEOUS ACID SOLUTION COMPRISING THE EXTERNAL PHASE, AND SAID ORGANIC LIQUID HAS A VISCOSITY RANGING FROM ABOUT 5 TO ABOUT 10.000 CENTIPOISE, CONTAINS LESS THAN ABOUT 20 PER CENT BY WEIGHT OF AROMATICS AND COMPRISES FROM ABOUT 20 TO ABOUT 50 PER CENT BY VOLUME OF THE EMULSION .
Claim 7
Dependent Claim
20 words
The method of claim 4 wherein said organic liquid has a viscosity ranging from about 25 to about 2,000 centipoise.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein the aqueous acid phase of the emulsion is substantially free from agents for increasing the viscosity of said phase.
Claim 9
Dependent Claim
22 words
The method of claim 4 wherein the aqueous acid solution is substantially free from agents for increasing the viscosity of said phase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |