The Fine Description Of Ying 11E_s3 Low Permeability Reservoir, The Nomerical Simulation And Analysis Of Horizontal Well-development In Dongxin Oil Field

Ying 11 block, in the Sha III member of Dongxin oilfield, is the major development block of Dongxin oil field, and now in difficult situation, such as poor performance in injection-development and well deterioration, gradually with the thorough development in progress. For many years, many methods, such as well-pattern modification and fracturing, have failed to solve the problems above fundamentally; therefore, the systematic and thorough study concentrated in geology and development is proposed in this thesis.Ying 11 block is characterized in face by slip turbid fan in semi-deep and deep lacustrine, and therefore divided into three sections and overall 24 layers, among which, the 18th layer is the major layer, with a predominant reserve up to 85% of Sha III member, is characterized by favorable connectivity and continuity, reservoir property and oil production, and large scale in the block.According to the second explanation geologic model of reserve logging with improved accuracy of explanation on reservoir property parameters, high heterogeneity is exhibited in the inner and microscopic layer of sand body, however, the favorable lateral homogeneity is existed due to the special depositional environment and simple in depositional facies.The research of seepage theory on the low-permeability reservoir with extra-high pressure revealed the influence of startup pressure gradient, capillary pressure and wetting degree on the development performance and displacement characteristic of low-permeability oilfield. The flooding of reservoir, distribution and development potential of remaining oil is studied with reservoir data simulation so as to propose that the serious flooding is mainly concentrated in the north-east area with favorable reservoir property and less in the south area, therefore more remaining oil reserve is trapped in south and north area. In addition, the feasibility of horizontal well is analyzed combined with the research of remaining oil, recoverable reserve and well pattern and so on discussed above.