Mechanism research on technical policy of liquid extraction depressurization development for buried hill reservoirs

Most of buried hill reservoirs are in the late stage water flooding development, especially for this kind reservoir with large water-oil volume ratio, it is more difficult to develop residual oil matrix system. This article presents a new idea about technical policy extraction depressurization development which has not been studied domestic and abroad, analyses major influence factor liquid by dual-media numerical simulation depth. The results show that can increase production system greater extent depressurization. capacity most important contains effect uniform speed extraction, variable periodic extraction. Under condition keeping stable production, larger extracted, faster pressure dropped, will be discharged According these results, paper suggests reasonable depressurization, great significance obtain good slowing down cut enhancing recovery high enough energy.