Laboratory research on CO_2 injection displacement in ZJD oilfield

Based on the example of improving recovery ratio by CO2injection displacement in ZJD reservoir, we adopted indoor experimental methods in reservoir, which didn't achieve miscible flooding effects at the initial stage of development. After pressure improvement by gas injection, the reservoir had CO2miscible flooding effects. Comparing with gas recovery effects of CO2injection in different period, whether the reservoir has yield increasing potential can be approved, and its effects can be evaluated. The results can provide reasonable production methods for ZJD oilfield and technical references for similar reservoir as well.