US 12,276,185 B2
Stimulating hydrocarbon reservoirs
Katherine Leigh Hull, Houston, TX (US); Amy J. Cairns, Houston, TX (US); and Rajesh Kumar Saini, Cypress, TX (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jan. 18, 2024, as Appl. No. 18/416,517.
Application 18/416,517 is a division of application No. 17/829,972, filed on Jun. 1, 2022, granted, now 11,905,804.
Prior Publication US 2024/0200430 A1, Jun. 20, 2024
Int. Cl. E21B 43/16 (2006.01); E21B 43/25 (2006.01)
CPC E21B 43/164 (2013.01) [E21B 43/25 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for treating a hydrocarbon reservoir, comprising:
delivering a composition to the hydrocarbon reservoir, the composition comprising:
at least one acid, and
liquid or supercritical carbon dioxide (CO2);
exposing the delivered composition to water to activate the composition; and
treating a rock formation of the hydrocarbon reservoir with the activated composition,
wherein the composition comprises the at least one acid and the liquid or supercritical CO2 in an acid-CO2 emulsion that is exclusive of nanoparticles and comprises an outer continuous phase that comprises the liquid or supercritical CO2 and an internal phase that comprises the at least one acid and a surfactant.