Integrated Simulation Approach for Fracture Network Propagation and Gas Flow in Shale Gas Reservoirs

doi:10.11885/j.issn.1674-5086.2021.02.28.04

Abstract

Abstract: The distribution of natural fractures in shale gas reservoirs is complex, and the reservoir heterogeneity is strong. Hydraulic fracturing of horizontal wells is a necessary way for its development. Establishing an integrated simulation method for fracturing network propagation simulation and flow simulation in shale gas reservoirs has important practical significance for formulating production plans and evaluating the quality of hydraulic fracturing. In this paper, the fracture propagation calculation method based on lightning simulation is used to simulate the multi-branch fracture network pattern of shale gas reservoirs. On this basis, the embedded discrete fracture model (EDFM) is further used to quantitatively characterize the complex flow mechanism between the organic matter-inorganic matter-fracture network of shale gas reservoirs, so as to realize the integrated simulation of fracture network propagation and gas flow in shale gas reservoirs. Based on this method, a 200 m×200 m geological model was established to simulate fracture morphology and flow characterization. The fracture network distribution is obtained by the fracture network propagation simulation method, and the flow simulation is carried out based on the embedded discrete fracture model. The gas saturation distribution and gas production are obtained. At the same time, based on this model, the influence of parameters such as fracturing fluid injection pressure, fractal probability index, fracturing fluid viscosity and fracture simulation accuracy on fracture network, gas saturation distribution and shale gas production is analyzed. Research shows that:the higher the fracturing fluid injection pressure is, the smaller the fractal probability index is, the smaller the fracturing fluid viscosity is, the larger the fracture propagation range will be, the greater the gas saturation reduction range will be, and the higher the single well production will be; the fineness of the fracture grid will significantly affect the production. This model can simulate the shale gas reservoir fracture network pattern, and the complex flow of multiple media on a large scale, which provides effective help for evaluating the hydraulic fracturing of shale gas reservoirs and predicting production.

Key words: shale gas reservoir, hydraulic fracturing, fracture network propagation, flow simulation, integrated simulation

CLC Number:

TE33

SHENG Guanglong, HUANG Luoyi, ZHAO Hui, RAO Xiang, MA Jialing. Integrated Simulation Approach for Fracture Network Propagation and Gas Flow in Shale Gas Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 84-96.

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