US 12,305,490 B1
Method of nano-armored foam reinforced geological storage of carbon dioxide
Qichao Lv, Beijing (CN); Tongke Zhou, Beijing (CN); Juan Zhang, Beijing (CN); Ya Zhao, Beijing (CN); Honglei Zhan, Beijing (CN); Rong Zheng, Beijing (CN); Abdolhossein Hemmati-Sarapardeh, Beijing (CN); Mehdi Ostadhassan, Beijing (CN); and Zhaoxia Dong, Beijing (CN)
Assigned to China University of Petroleum-Beijing, Beijing (CN)
Filed by China University of Petroleum—Beijing, Beijing (CN)
Filed on May 7, 2024, as Appl. No. 18/657,296.
Claims priority of application No. 202410108178.1 (CN), filed on Jan. 25, 2024.
Int. Cl. E21B 41/00 (2006.01); C09K 8/42 (2006.01)
CPC E21B 41/0064 (2013.01) [C09K 8/426 (2013.01); C09K 2208/08 (2013.01); C09K 2208/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of nano-armored foam reinforced geological storage of carbon dioxide, comprising following steps:
(1) injecting a pre-CO2 slug into a geological storage formation, after an injection pressure of the pre-CO2 slug shows a peak value, proceeding with an injection of the pre-CO2 slug until the injection pressure is reduced to ½-⅔ of a maximum pressure, stopping the injection of the pre-CO2 slug, and then injecting a surfactant foam slug;
(2) after completing the injection of the surfactant foam slug, successively injecting a nano-fluid foaming liquid slug and a post-CO2 slug, wherein the post-CO2 slug is injected multiple times in equal portions, and a well soaking is performed after completing each injection;
wherein a ratio of each injection amount of the post-CO2 slug to an injection amount of the nano-fluid foaming liquid slug is 1:(2-3);
the surfactant foam slug comprises a gas phase and a liquid phase; the gas phase comprises CO2, and the liquid phase comprises 0.1-2.0 wt % of a first foaming agent and water in balance based on a mass percentage content; a foam quality of the surfactant foam slug is 50-80%;
the nano-fluid foaming liquid slug comprises: 0.1-2.0 wt % of a second foaming agent, 0.05-1.0 wt % of nanoparticle, 0.01-0.05 wt % of a pH regulator, 0.1-2.0 wt % of a particle solubilizer, and water in balance, based on a mass percentage content.