公开(公告)号：US11873703B2

公开(公告)日：2024-01-16

申请号：US17914818

申请日：2022-02-15

Applicant: Japan Petroleum Exploration Co., Ltd.

Inventor： Yoshihiro Terao ,  Kazuto Kurosawa

IPC: E21B43/16

CPC classification number: E21B43/164

Abstract: A method of underground storage of an injection gas containing CO2 gas and enhanced oil recovery includes: supplying injection water through a water flow path; jetting the injection water as a high-pressure water jet which is increased in velocity by narrowing a fluid flow through a fine bubble-generating device placed at a lower end of the water flow path; suctioning an injection gas through a gas flow path by a negative pressure generated by the Venturi effect downstream of the high-pressure water jet; jetting the injection gas as fine bubbles from the fine bubble-generating device placed at a lower end of the gas flow path; and performing underground storage of the injection gas by allowing a gas-liquid mixed fluid containing fine bubbles generated by mixing the injection water with the fine bubbles in the fine bubble-generating device to penetrate into a permeable formation such as an oil reservoir.