Patent ID: 11867038
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC C  E | IPC E

Claim 15:
16. A system for oil recovery, comprising:
an injection well;
a reservoir containing oil positioned below the injection well;
thickened CO2, wherein the thickened CO2 comprises a thickener comprising a blend of 50 vol. % of a copolymer comprising an acrylate with 50 vol. % of a mixture comprising propylene carbonate, allyl this ethyl carbonate, propylene allyl ethyl carbonate, dimethyl carbonate, white oil, silicon, or petroleum ether, or a combination thereof;
an interface between the thickened CO2 and the oil;
unthickened CO2 disposed over the thickened CO2; and
a horizontal recovery well drilled below the reservoir.