US 12,305,489 B2
Surfactant formulation and method for water flood assisted CO2 sequestration
Pramod Dhanaji Patil, Sugar Land, TX (US); Shiv S. Sangaru, Khobar (SA); Subhash C. Ayirala, Dhahran (SA); Ali A. Yousef, Dhahran (SA); Abdulaziz S. Qasim, Dammam (SA); Zuhair A. Al-Yousef, Saihat (SA); and Muhammad M. Almajid, Qatif (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Oct. 6, 2023, as Appl. No. 18/482,647.
Prior Publication US 2025/0116173 A1, Apr. 10, 2025
Int. Cl. E21B 41/00 (2006.01); C09K 8/584 (2006.01); C09K 8/594 (2006.01); E21B 43/16 (2006.01)
CPC E21B 41/0064 (2013.01) [C09K 8/584 (2013.01); C09K 8/594 (2013.01); E21B 43/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for sequestering CO2 in a subterranean formation, the method comprising:
preparing a solution comprising CO2 and from 0.01% by weight (wt. %) to 10 wt. % of a CO2 soluble alkoxylate surfactant based on the total weight of CO2;
processing the solution through a dispersing unit in fluid communication with an injection well, thereby forming a dispersion comprising CO2 microbubbles and CO2 nanobubbles dispersed in an aqueous fluid, wherein a volume fraction of CO2 is in a range from 10 vol % or less based on the total volume of the dispersion; and
injecting the dispersion into the injection well of the formation, thereby sequestering CO2 in the formation.