Alkyl hydrophobe surfactants
View Patent ↗Provided herein are inter alia novel compositions and methods having application in the field of enhanced oil recovery. In particular, the short hydrophobe compounds and mixtures thereof presented herein can be used, inter alia, for the recovery of a large range of crude oil compositions from challenging reservoirs.
1. A compound having the formula:
wherein
R 1 is R 4 -substituted or unsubstituted linear C 8 -C 11 alkyl;
R 4 is independently unsubstituted aryl or unsubstituted cycloalkyl;
y is an integer from 5 to 40;
x is an integer from 35 to 50;
X is —SO 3 − M + , —CH 2 C(O)O − M + , —SO 3 H or —CH 2 C(O)OH;
M + is a monovalent, divalent or trivalent cation, x is greater than y, and
the sum of x and y is greater than 50.
2. The compound of claim 1 , wherein M + is Na + , K + , NH 4 + , Ca +2 , M +2 or Ba +2 .
3. An aqueous composition comprising a co-surfactant and the compound of claim 1 .
4. The aqueous composition of claim 3 , wherein the co-surfactant is an anionic surfactant, a non-ionic surfactant, a zwitterionic surfactant, or a cationic surfactant.
5. The aqueous composition of claim 3 , wherein the co-surfactant is a C 10 -C 30 internal olefin sulfate (IOS) or a C 8 -C 30 alkyl benzene sulfonate (ABS).
6. The aqueous composition of claim 3 , further comprising a viscosity enhancing water-soluble polymer.
7. The aqueous composition of claim 3 , further comprising an alkali agent.
8. The aqueous composition of claim 3 , further comprising a co-solvent.
9. The aqueous composition of claim 3 , further comprising a gas.
10. The aqueous composition of claim 3 , wherein the compound is present in an amount sufficient to increase the solubility of the co-surfactant in the aqueous composition relative to the absence of the compound.
11. The aqueous composition of claim 3 having a salinity of at least 5000 ppm.
12. An emulsion composition comprising an unrefined petroleum and a compound of claim 1 .
13. The emulsion composition of claim 12 further comprising a co-surfactant.
14. The emulsion composition of claim 13 , wherein the viscosity of the emulsion composition is less than the viscosity in the absence of the co-surfactant.
15. A method of displacing a hydrocarbon material in contact with a solid material, the method comprising:
(i) contacting a hydrocarbon material with the compound of claim 1 , wherein the hydrocarbon material is in contact with a solid material;
(ii) allowing the hydrocarbon material to separate from the solid material thereby displacing the hydrocarbon material in contact with the solid material.
16. The method of claim 15 , wherein the method is an enhanced oil recovery method.
17. The compound of claim 1 , wherein y is an integer from 5 to 20.
18. The aqueous composition of claim 3 , wherein the aqueous composition does not include a non-ionic surfactant.
19. The emulsion composition of claim 12 , wherein the emulsion does not include a non-ionic surfactant.