CO2 injection for EOR & underground storage

The mechanism of oil displacement by carbon dioxide injection is identified, and the flowing behaviors and storage conditions of the injected CO2 are studied. As a result, an optimum injection plan is worked out to maximize CO2 storage as well as oil displacement.

Control of CO2 flooding profile: Non-flowing polymer gel will be formed chemically to plug the underground cracks and pores in order to multiply the swept volume of CO2 and facilitate oil displacement.

Surface engineering of CO2 flooding: Focusing on effective CO2 capture and safe injection, an integrated system will be introduced for separation, purification, transfer and injection of CO2, fluid collection and gathering, and cyclic injection. Thus, CO2 can be effectively stored underground.

Block Hei-59 at Jilin oilfield became the first pilot project to use CO2 flooding for CO2 emission reduction. Kicked off in April 2008, the project consists of 6 injection wells and 25 oil-producing wells which have shown highly-efficient miscible displacement. In comparison with water flooding, the per-well production increases by 30% and the recovery efficiency goes up by 10%, resulting in a yearly crude production of 30,000 tons and a cumulative crude production of 180,000 tons by 2015.