Evaluation method for low permeability heterogeneous oil reservoir horizontal well repeated fracturing yield increasing potential
A heterogeneous reservoir and refracturing technology, which is applied in oil and gas development and hydraulic fracturing, can solve the problems of large differences in formation pressure field distribution, neglect of formation pressure, and failure to consider the impact of hydraulic fracture productivity, etc., to improve Accuracy and the effect of reducing construction risks
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[0075] The porosity of a certain oil reservoir block in my country is 4.6-13.2%, with an average of 10.5%, and the permeability is 0.01-1.25×10 -3 μm 2 , with an average of 0.39×10 -3 μm 2 , the crude oil saturation is 38%, the buried depth of the reservoir is 1968m, the initial formation pressure is 24.3MPa, the formation temperature is 88.9℃, the lithology is sand-mudstone thin interbed, the physical property and oil-bearing property are poor, and it belongs to the heterogeneous low-permeability tight sandstone reservoir , developed using large-scale multi-stage multi-cluster volume fracturing technology for horizontal wells. One of the horizontal wells has a horizontal section length of 1200m, 39 clusters in 10 sections for initial fracturing, half-length of designed fractures is 300m, and fracture spacing is 30m. Using elastic energy to develop without injection-production well pattern, the current daily oil production has dropped from 26.3t / d in the initial stage to 1....
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