| Kawaguchi oil block is located in the middle of Liu Drainage Basin, the main producing formation is to extend the group’s long 4 + 52, sedimentary facies delta distributary channel mainly for typical ultra-low porosity and low permeability reservoirs. Use 150 × 110 m rectangular well pattern and "anti-nine" injection-production mode, after all injection wells fracturing. Prominent contradictions show some wells flooded, water string is serious, most of the well by the poor level of efficiency, faster production decline(the current average single well daily oil production of 0.35 t / d), facing a severe and stable situation.The study grew contrast layer begins to divide, were constructed to study sedimentary facies, reservoir have sex, matrix, field development evaluation, three-dimensional modeling and numerical simulation etc; on this basis, the proposed network existing wells means "and cited plugging effect" of flooding patterns and changes in the conditions of stable production technical countermeasures.Liu Yanchang canal block is divided into four small oil-bearing layer, in addition to long 4 + 5is a meandering river, the other three small layers major distributary channel, channel sands average width of 50-250 m. Sand plane connectivity for multi-stage sand were superimposed truncated result, strong heterogeneity. On the basis of a comprehensive study on the proposed comprehensive consideration of the well layer conditions, status of field development and practical means of stable production process technical countermeasures. |
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