EDFM-based Numerical Simulation of Horizontal Wells with Multi-stage Hydraulic Fracturing in Tight Reservoirs

doi:10.11885/j.issn.1674-5086.2018.11.21.05

Abstract

Abstract: Fracture modeling for horizontal wells with multi-stage hydraulic fracturing (fracking) in tight reservoirs is extremely challenging, which means that evaluating the productivity of these wells is difficult. To address this problem, a threedimensional (3D) model of horizontal wells with multi-stage hydraulic fracturing in tight reservoirs, which accounts for the effects of gravity and stress sensitivity, was constructed using the embedded discrete fracture model (EDFM) with a rectangular grid. First, Saphir was used to examine the accuracy of this model. The numerical simulation of 3D tight reservoirs, tight naturally fractured reservoirs, and the effects of fracture distribution and morphology was then performed using this model. It was shown that EDFM produces an accurate depiction of fluid flow characteristics in both natural fractures and fracking-induced fracture networks. It was concluded that fracking should be performed in areas where natural fractures are well-developed. Moreover, it was found that well productivity is significantly affected by the distribution and morphology of fractures in a horizontal well with multi-stage fracking, where the greater the area of contact between the fracture network and matrix, the greater the well productivity. Therefore, one of the goals of massive hydraulic fracturing is to realize optimal fracture distribution.

Key words: horizontal wells with multi-stage hydraulic fracturing, embedded discrete fracture model, three-dimensional reservoirs, natural fractures, fracture distribution and morphology

CLC Number:

TE319

ZHANG Liehui, LIU Sha, YONG Rui, LI Bo, ZHAO Yulong. EDFM-based Numerical Simulation of Horizontal Wells with Multi-stage Hydraulic Fracturing in Tight Reservoirs[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 1-11.

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