US 12,110,772 B1
In-reservoir carbon dioxide release for enhanced hydrocarbon recovery
Zuhair Alyousef, Dhahran (SA); Hamoud Alqahtani, Dhahran (SA); Subhash C. Ayirala, Dhahran (SA); Muhammad M. Almajid, Dhahran (SA); and Ali A. Al-Taq, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on May 10, 2023, as Appl. No. 18/315,262.
Int. Cl. E21B 43/16 (2006.01); E21B 43/24 (2006.01)
CPC E21B 43/164 (2013.01) [E21B 43/24 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method comprising:
introducing a carbonated aqueous fluid into a subterranean reservoir, the carbonated aqueous fluid comprising carbon dioxide dissolved in an aqueous fluid;
introducing an aqueous flooding fluid into the subterranean reservoir prior to introducing the carbonated aqueous fluid, the carbonated aqueous fluid having a higher density than the aqueous flooding fluid;
introducing a first salt solution comprising a first salt into the subterranean reservoir after introducing the carbonated aqueous fluid;
introducing a second salt solution comprising a second salt into the subterranean reservoir after introducing the carbonated aqueous fluid;
contacting the first salt and the second salt under conditions where the first salt and the second salt undergo an exothermic reaction; and
heating the carbonated aqueous fluid with heat produced via the exothermic reaction;
wherein at least a portion of the carbon dioxide is released from the carbonated aqueous fluid upon heating and migrates from a lower portion to an upper portion of the subterranean reservoir, and a decarbonated saline solution is generated from the carbonated aqueous fluid from which the carbon dioxide is released.