US 12,031,413 B2
Enhancing CO2 sequestration efficiency with CO2-soluble thickener
Muhammad M. Almajid, Qatif (SA); and Zuhair AlYousef, Saihat (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Mar. 2, 2022, as Appl. No. 17/653,181.
Prior Publication US 2023/0279746 A1, Sep. 7, 2023
Int. Cl. E21B 41/00 (2006.01); B65G 5/00 (2006.01); C01B 32/50 (2017.01)
CPC E21B 41/0064 (2013.01) [B65G 5/00 (2013.01); C01B 32/50 (2017.08)] 18 Claims
OG exemplary drawing
 
1. A method for sequestering carbon dioxide (CO2), in a depleted reservoir, the method comprising:
introducing a thickened CO2 mixture into the depleted reservoir, wherein the thickened CO2 mixture comprises:
CO2
a CO2 thickener comprising a methyl acrylate-based copolymer;
a CO2 solvent selected from the group consisting of propylene carbonate, allyl ethyl carbonate, or dimethyl carbonate, and combinations thereof; and
a solvent.