US 12,392,224 B2
Methods for carbon dioxide or hydrogen sulfide sequestration in a subterranean reservoir using sorbent particles
Amos Ben-Zvi, Calgary (CA); Michael Patrick McKay, Calgary (CA); and Paulina Morasse, Calgary (CA)
Assigned to Cenovus Energy Inc., Calgary (CA)
Filed by Cenovus Energy Inc., Calgary (CA)
Filed on Nov. 14, 2023, as Appl. No. 18/509,209.
Application 18/509,209 is a division of application No. 17/817,189, filed on Aug. 3, 2022, granted, now 12,104,465.
Claims priority of provisional application 63/229,916, filed on Aug. 5, 2021.
Prior Publication US 2024/0076962 A1, Mar. 7, 2024
Int. Cl. E21B 41/00 (2006.01)
CPC E21B 41/0064 (2013.01) [E21B 41/0057 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for sequestering a pollutant gas comprising carbon dioxide (CO2) gas or hydrogen sulfide (H2S), or both carbon dioxide and hydrogen sulfide, in a subterranean reservoir, the method comprising:
(a) introducing the pollutant gas into a carrier liquid containing pollutant-sorbent particles to produce a pollutant-rich carrier liquid;
(b) pumping the pollutant-rich carrier liquid into the subterranean reservoir, and maintaining the pollutant-rich carrier liquid for a residence time in the subterranean reservoir;
(c) injecting a modifier gas or a modifier liquid into the subterranean reservoir to vary one or more of a temperature in the subterranean reservoir, a pressure in the subterranean reservoir, or a pH of a liquid in the subterranean reservoir temperature, and thereby cause the pollutant-sorbent particles to release the sequestered pollutant gas; and
(d) producing the released pollutant gas from the subterranean reservoir to the surface.