US 12,129,749 B1
Methods for removing carbon dioxide from natural gas
Peng Lu, Dhahran (SA); and Pan Luo, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Jul. 26, 2023, as Appl. No. 18/359,615.
Int. Cl. E21B 43/16 (2006.01); C09K 8/84 (2006.01)
CPC E21B 43/16 (2013.01) [C09K 8/845 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining an origin fluid having a calcium concentration of about 1.5 M or greater;
creating a treatment fluid by introducing an amount of slaked lime to the origin fluid to change a pH of the resulting treatment fluid to about 11 or greater;
wherein the amount of slaked lime is a second output of a reactive transport model;
introducing the treatment fluid into a subterranean formation containing a formation gas comprising natural gas and carbon dioxide;
wherein a rate of introduction of the treatment fluid into the subterranean formation is a third output of the reactive transport model;
allowing the calcium in the treatment fluid to react with the carbon dioxide within the subterranean formation to form calcite; and
removing the treated formation gas from the subterranean formation after the formation of calcite, wherein the concentration of carbon dioxide in the treated formation gas is lower than the formation gas before it was contacted with the treatment fluid.