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METHOD FOR PREDICTING RESERVOIR REFORM VOLUME AFTER VERTICAL WELL VOLUME FRACTURING OF LOW-PERMEABILITY OIL/GAS RESERVOIR
METHOD FOR PREDICTING RESERVOIR REFORM VOLUME AFTER VERTICAL WELL VOLUME FRACTURING OF LOW-PERMEABILITY OIL/GAS RESERVOIR
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机译:低渗透油/气藏垂直井体积压裂后储层改造量预测方法
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摘要
The invention provides a method for predicting a reservoir reform volume after vertical well volume fracturing of a low-permeability oil/gas reservoir. The method sequentially includes the following steps: (1) calculating an induced stress produced by a hydraulic fracture in a three-dimensional space; (2) calculating a stratum pore pressure obtained after leak-off of fracturing fluid; (3) calculating a stratum pore elastic stress obtained after the leak-off of the fracturing fluid; (4) overlapping the stress fields obtained in the step (1), (2) and (3) with an original crustal stress field to obtain a new crustal stress field, and calculating the magnitude and direction of the overlapped three-direction effective principal stress in the reservoir space; (5) calculating an open fracturing determination coefficient M of a natural fracture in the reservoir space and a shear fracturing area determination coefficient S of the natural fracture.
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