SIMULATION OF FRACTURE PROPAGATION IN LARGE-SCALE RESERVOIR WITH LOW PERMEABILITY AND THIN INTERBEDDED SANDSTONE
YAN Xiangzhen1，SONG Gencai2，WANG Tongtao1，YANG Xiujuan1，LI Yong1
(1. College of Storage and Transportation and Architectural Engineering，China University of Petroleum，Dongying，Shandong 257061，China；2. College of Petroleum Engineering，China University of Petroleum，Dongying，Shandong 257061，China)
Abstract：The length/height ratio of fracture is usually smaller than 4. When the large-scale hydraulic fracturing is carried out on reservoir with low permeability and thin interbedded sandstone，because the interlayer is thin and its strength is low，a weak restriction is shown in the height of fracture development. Under this condition，the pseudo-3D model only considering the fluid flowing along the length direction of fracture does not work. So，the pseudo-3D model of predicting the fracture development with 2D flow is built up according to the characteristics of hydraulic fracturing in reservoir with low permeability and thin interbedded sandstone based on linear elastic fracture theory and proper hypotheses. The precise solutions of fracture length and height are calculated by the pseudo-3D model during hydraulic fracturing. The program for fracture parameters is coded based on the pseudo-3D model of 2D flow，which is used to simulate the fracture development during hydraulic fracturing in an actual reservoir with low permeability and thin interbedded sandstone. The results show that the pseudo-3D model of 2D flow has a perfect performance in analyzing the fracture development during large-scale hydraulic fracturing in reservoir with low permeability and thin interbedded sandstone，and can be satisfied with engineering demands.
