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|1. (WO2018195909) METHOD FOR PREDICTING VERTICAL WELL VOLUME FRACTURED RESERVOIR REFORM VOLUME OF LOW PERMEABLE RESERVOIR|
|Applicants:||SOUTHWEST PETROLEUM UNIVERSITY
|Title:||METHOD FOR PREDICTING VERTICAL WELL VOLUME FRACTURED RESERVOIR REFORM VOLUME OF LOW PERMEABLE RESERVOIR|
Disclosed in the present invention is a method for predicting a vertical well volume fractured reservoir reform volume of a low permeable reservoir. The method sequentially comprises the following steps: (1) calculating the induced stress produced by a hydraulic fracture in a three-dimensional space; (2) calculating the formation pore pressure obtained after leak-off of fracturing fluid; (3) calculating the formation pore elastic stress obtained after the leak-off of the fracturing fluid; (4) overlapping the obtained three stress fields with an in-situ stress field to obtain a new crustal stress field, and calculating the magnitude and the direction of three-way principal effective stress in the overlapped reservoir space; and (5) calculating the open fracture determining coefficient M of a natural fracture in the reservoir space and the shear fracture region determining coefficient S of the natural fracture, so as to predict the volume fractured reservoir reform volume. The method is used for predicting the reservoir reform volume after vertical well volume fracturing, has better operability and accuracy, provides a favorable theoretical basis for effect evaluation and yield prediction after vertical well volume fracturing of the low permeable reservoir, and overcomes the defects of the prior art.