US 12,441,940 B1
Surfactant formulations for aqueous foam stability at high temperature and high salinity conditions
Yifan Wang, Lake Jackson, TX (US); Amit Katiyar, Sugar Land, TX (US); Troy E. Knight, Missouri City, TX (US); Matthew E. Crosley, Lake Jackson, TX (US); and Phillip D. Kardenetz, Lake Jackson, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 18/875,203
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Aug. 16, 2023, PCT No. PCT/US2023/072305
§ 371(c)(1), (2) Date Dec. 16, 2024,
PCT Pub. No. WO2024/050233, PCT Pub. Date Mar. 7, 2024.
Application 18/875,203 is a continuation of application No. 17/900,031, filed on Aug. 31, 2022, granted, now 12,129,421, issued on Oct. 29, 2024.
Int. Cl. E21B 43/34 (2006.01); C09K 8/584 (2006.01); C09K 8/594 (2006.01); C09K 23/00 (2022.01); C09K 23/12 (2022.01); C09K 23/02 (2022.01)
CPC C09K 23/12 (2022.01) [C09K 8/584 (2013.01); C09K 8/594 (2013.01); C09K 23/017 (2022.01); C09K 23/02 (2022.01)] 9 Claims
 
1. A method of recovering hydrocarbons from a reservoir during gas injection into said reservoir comprising at least periodically injecting gas and a foam-forming formulation into the reservoir, wherein the foam-forming formulation comprises
a. a solubilizing component comprising one or more materials corresponding to the following formulas:

OG Complex Work Unit Chemistry
where X is H, an alkali metal, alkaline earth metal, or ammonium, and R is a linear C6-C16 alkyl group;
b. one or more alpha-olefin sulfonate surfactants having a carbon chain length of from 10 to 16 carbon atoms, and
c. water; and
wherein component a and component b are present in a ratio of from 1:2 to 4:1, by weight.