Patent US3796266A successfully refreshed from Google Patents.
US3796266A
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Surfactant oil recovery process
Assignee: Texaco Inc
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Filing: 1972-12-13
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Granted: 1974-03-12
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Expires: 1992-12-13
Abstract
Abstract An aqueous solution comprising an alkalinity agent such as sodium hydroxide, a water soluble guanidine salt such as guanidine hydrochloride and an anionic surfactant such as an aliphatic sulfate, specifically dodecyl sulfate or cetyl sulfate, or a water soluble salt of an unsaturated aliphatic monobasic carboxylic acid, such as sodium oleate, is injected into a subterranean petroleum containing formation, followed by the injection of water to displace a surfactant-guanidine solution through the formation. A plurality of benefits result from the use of this combination, including increased injection solution viscosity for mobility ratio improvement, inhibition of clay swelling which causes formation permeability damage, and improved salt tolerance of the surfactant solution so that surfactantemulsion flooding may be carried out in subterranean petroleum containing formations whose formation water salinity is as high as 4 percent.
Inventors
- 👤 J Carlin
- 👤 K Flournoy
- 👤 R Cardenas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:44
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
34 words
A method as recited in claim 1 wherein the water soluble guanidine compound is selected from the group consisting of guanidine, quanidine hydrochloride, quanidine acetate, guanidine sulfate, guanidine carbonate, guanidine thiocyanate, and guanidine nitrate.
Claim 2
Dependent Claim
14 words
The method of claim 2 wherein the water soluble guanidine compound is guanidine hydrochloride.
Claim 3
Dependent Claim
14 words
The method of claim 2 wherein the water soluble guanidine compound is guanidine carbonate.
Claim 4
Dependent Claim
26 words
A method as recited in claim 1 wherein the concentration of water soluble guanidine compound is from about 0.10 percent to about 2.0 percent by weight.
Claim 5
Dependent Claim
26 words
A method as recited in claim 1 wherein the concentration of water soluble guanidine compound is from about 0.3 percent to about 0.8 percent by weight.
Claim 6
Dependent Claim
51 words
A method as recited in claim 1 wherein the water soluble salt of an alkyl sulfate has the following formula: CH3 - (CH2)p - S04 - X wherein P is an integer from 9 to 19 and X is selected from the group consisting of nonovalent metallic ions, ammonia and amines.
Claim 7
Dependent Claim
18 words
The method of claim 7 wherein the water soluble salt of an alkyl sulfate is sodium dodecyl sulfate.
Claim 8
Dependent Claim
18 words
The method of claim 7 wherein the water soluble salt of an alkyl sulfate is sodium cetyl sulfate.
Claim 9
Dependent Claim
65 words
A method as recited in claim 1 wherein the salt of the unsaturated aliphatic monobasic acid has the following formula: CH3 - (CH2)N - CH CH - (CH2)M - COO - X wherein M and N are integers and the sum of M and N is from 6 to 16, and X is selected from the group consisting of metallic monovalent ions, ammonia, and amines.
Claim 10
Dependent Claim
18 words
The method of claim 10 wherein the salt of an unsaturated aliphated monobasic carboxylic acid is sodium oleate.
Claim 11
Dependent Claim
18 words
The method of claim 10 wherein the salt of an unsaturated aliphatic monobasic carboxylic acid is sodium elaideate.
Claim 12
Dependent Claim
28 words
The method of claim 1 wherein the concentration of the salt of the unsaturated, aliphatic monobasic carboxylic acid is from about 0.1 to about 2.0 percent by weight.
Claim 13
Dependent Claim
28 words
The method of claim 1 wherein the concentration of the salt of the unsaturated aliphatic monobasic carboxylic acid is from about 0.3 to about 0.8 percent by weight.
Claim 14
Dependent Claim
25 words
A method as recited in claim 1 wherein the solution also contains from about 0.05 to about 5.0 percent by weight of an alkalinity agent.
Claim 15
Dependent Claim
12 words
The method of claim 15 wherein the alkalinity agent is sodium hydroxide.
Claim 16
Dependent Claim
29 words
A method as recited in claim 1 wherein from about 0.02 to about 0.50 pore volumes of the guanidine compound and surfactant containing solution is injected into the formation.
Claim 17
Dependent Claim
26 words
A method as reicted in claim 1 comprising the additional step of displacing the guanidine compound and surfactant containing solution by injecting water into the formation.
Claim 18
Dependent Claim
14 words
A method as recited in claim 1 wherein the aqueous solution also contains quinoline.
Claim 19
Independent Claim
40 words
A method of recovering petroleum from a subterranean, petroleum containing formation comprising: injecting into said formation an aqueous solution comprising an alkalinity agent and a guanidine salt of an unsaturated aliphatic carboxylic acid having from ten to twenty carbon atoms.
Claim 20
Dependent Claim
20 words
A method as recited in claim 20 wherein the guanidine salt of an unsaturated aliphatic carboxylic acid is guanidine oleate.
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |