Study of CO2 Flooding to Improve Development Effect in Conglomerate Reservoirs

For low permeability sandstone reservoirs, CO2 flooding has been proved to be an effective method enhance oil recovery. Reservoir A is a typical conglomerate reservoir in Xinjiang oilfield. The strong water sensitivity, and the injection pressure continues rise. Furthermore well drop. According screening conditions of flooding, can easily achieve miscible with moderate temperature. And advantage being close gas source. Firstly, relationship curve between displacement efficiency was obtained by changing using fine-tube experimental model, minimum determined. 24.1 MPa. change phase state after further studied expansion experiment. results show that saturation formation increases significantly injection, more higher oil. When content injected crude 55.29 mol%, system reaches 31.60 Then, order better simulate real reservoir, 2D visualization model outcrop processed analyze microscopic mechanism CO2. remaining mainly exists form cluster, film, column blind end, island, cluster there obvious gravity overlay phenomenon. improved sweep enhanced Finally, through analysis field effect A, it shown absorption capacity single than capacity. equilibrium degree production profile stage stage. Injecting carbon dioxide quickly restores pressure. recovery trial obviously compared research this paper provide reference for application technology reservoir.