Study on enhancing oil recovery by CO2 injection in low permeability reservoir

Abstract

The distribution characteristics of remaining oil in low permeability reservoirs are aimed at the quantity and distribution of remaining oil in the reservoir at the present stage, so as to take measures to exploit these remaining oil under reasonable economic and technical conditions, so as to improve recovery. The technology of carbon dioxide hubbing and pumping is to inject a certain amount of carbon dioxide into the reservoir under a certain pressure, stew the well for a period of time to make the carbon dioxide spread in the formation and miscible with the formation crude oil, and then open the well for production. At present, there are many methods to study residual oil at home and abroad, mainly including reservoir engineering methods such as logging method, core analysis method, numerical simulation, and dynamic analysis method using monitoring data and dynamic and static data of reservoir. Study the macro and micro residual oil distribution accurately using CO2 huff and huff technology to increase production.