US3799264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfactant oil recovery process for use in formations containing high concentrations of polyvalent ions such as calcium or magnesium
Assignee: Texaco Inc
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Filing: 1972-12-13
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Granted: 1974-03-26
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Expires: 1992-12-13
Abstract
Abstract A surfactant composition usable in the presence of from about 500 to about 5,000 parts per million polyvalent ion concentrations, such as calcium and/or magnesium, comprising a sulfated aliphatic anionic surfactant such as sodium tridecyl sulfate, a water soluble guanidine salt such as guanidine hydrochloride, and a nonionic surfactant such as polyethoxylated aliphatic alcohol.
Inventors
- 👤 R Cardenas
- 👤 J Carlin
- 👤 K Flournoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:25
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
21 words
A method as recited in claim 1 wherein the sulfated aliphatic anionic surfactant has from 8 to 20 carbon atoms inclusive.
Claim 2
Dependent Claim
17 words
A method as recited in claim 2 wherein the sulfated aliphatic anionic surfactant is sodium tridecyl sulfate.
Claim 3
Dependent Claim
34 words
A method as recited in claim 1 wherein the water soluble guanidine compound is selected from the group consisting of guanidine, guanidine hydrochloride, guanidine acetate, guanidine sulfate, guanidine thiocyanate, guanidine carbonate, and guanidine nitrate.
Claim 4
Dependent Claim
15 words
A method as recited in claim 4 wherein the water soluble guanidine salt is guanidine.
Claim 5
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble guanidine salt is guanidine hydrochloride.
Claim 6
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble guanidine compound is guanidine acetate.
Claim 7
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble guanidine compound is guanidine sulfate.
Claim 8
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble guanidine compound is guanidine thiocyanate.
Claim 9
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble gaunidine compound is guanidine carbonate.
Claim 10
Dependent Claim
16 words
A method as recited in claim 4 wherein the water soluble guanidine compound is guanidine nitrate.
Claim 11
Dependent Claim
16 words
A method as recited in claim 1 wherein the nonionic surfactant is a polyethoxylated aliphatic alcohol.
Claim 12
Dependent Claim
25 words
A method as recited in claim 1 wherein the concentration of sulfated aliphatic anionic surfactant is from about 0.0125 to about 1.25 percent by weight.
Claim 13
Dependent Claim
25 words
A method as recited in claim 1 wherein the concentration of sulfated aliphatic anionic surfactant is from about 0.025 to about 0.125 percent by weight.
Claim 14
Dependent Claim
23 words
A method as recited in claim 1 wherein the concentration of nonionic surfactant is from about 0.02 to about 0.50 percent by weight.
Claim 15
Dependent Claim
23 words
A method as recited in claim 1 wherein the concentration of nonionic surfactant is from about 0.05 to about 0.20 percent by weight.
Claim 16
Dependent Claim
25 words
A method as recited in claim 1 wherein the concentration of water soluble guanidine compound is from about 0.05 to about 5 percent by weight.
Claim 17
Dependent Claim
25 words
A method as recited in claim 1 wherein the concentration of water soluble guanidine compound is from about 0.50 to about 1.50 percent by weight.
Claim 18
Dependent Claim
28 words
A method as recited in claim 1 wherein from abouT 2 percent pore volumes to about 50 percent pore volumes of surfactant solution are injected into the formation.
References Cited (Backward Citations)
US3302713A
Cited
US3360043A
Cited
US3468377A
Cited
US3444931A
Cited
US3515214A
Cited
US3508612A
Cited
US3675716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |