Search International and National Patent Collections

1. (WO2018195909) METHOD FOR PREDICTING VERTICAL WELL VOLUME FRACTURED RESERVOIR REFORM VOLUME OF LOW PERMEABLE RESERVOIR

Pub. No.:    WO/2018/195909    International Application No.:    PCT/CN2017/082411
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Apr 29 01:59:59 CEST 2017
IPC: E21B 43/26
Applicants: SOUTHWEST PETROLEUM UNIVERSITY
西南石油大学
Inventors: LI, Yongming
李勇明
XU, Wenjun
许文俊
ZHAO, Jinzhou
赵金洲
JIANG, Youshi
江有适
ZHANG, Liehui
张烈辉
Title: METHOD FOR PREDICTING VERTICAL WELL VOLUME FRACTURED RESERVOIR REFORM VOLUME OF LOW PERMEABLE RESERVOIR
Abstract:
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.