US 12,006,794 B1
Thermochemical fluid injection to prevent cool front invasion in CO2 geothermal reservoirs
Bora Yalcin, Thuwal (SA); Zuhair AlYousef, Saihat (SA); Abdulaziz S. Al-Qasim, Dammam (SA); and Subhash C. Ayirala, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Mar. 8, 2023, as Appl. No. 18/180,530.
Int. Cl. E21B 36/00 (2006.01); C09K 8/05 (2006.01); C09K 8/594 (2006.01); F24T 50/00 (2018.01)
CPC E21B 36/008 (2013.01) [C09K 8/05 (2013.01); C09K 8/594 (2013.01); F24T 50/00 (2018.05)] 19 Claims
 
1. A method of enhancing heat transfer and energy efficiency in a geothermal reservoir, the method comprising:
injecting a carbonated fluid to the reservoir, wherein the carbonated fluid injection decreases a temperature of the reservoir;
injecting a first salt solution and a second salt solution into the reservoir, wherein the second salt solution is reactive with the first salt solution under the conditions in the reservoir after the injecting; and
increasing the temperature of the reservoir by reacting the first salt solution with the second salt solution to provide heat.