Influence of Seepage Velocity on Shale Gas Exploration by Pore Network Simulation

doi:10.11885/j.issn.1674-5086.2019.09.17.01

Abstract

Abstract: Pore network model is an effective method to predict the flow characteristics of porous media. Based on characteristic values of shale gas reservoir, a pore network was established. And gas-water phase flow was simulated in that pore network. Seepage image was drawn by solving the pressure matrix equations of the model. By simulating flow under different velocities, the water penetration and seepage path were analyzed. As the results shows, the seepage velocity was positively correlated with the displacement pressure difference. When seepage velocity is higher than critical velocity v_c, pressure drop gradient has a main effect on the seepage path, which conforms to characteristics of fractal curve, and seepage velocity has an effect on stability of oil-gas interface and destroys equilibrium of gas/water interface thus facilitates water penetration and reduce gas production when it's high. There will be a stable gas/water interface and a large amount of gas production when seepage velocity is lower than v_c.

Key words: pore network model, shale gas, flow simulation, seepage velocity, seepage path, fractal theory

CLC Number:

TE327

GUO Xiao, YANG Kairui, YANG Yurui, JIA Haowei. Influence of Seepage Velocity on Shale Gas Exploration by Pore Network Simulation[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 19-27.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2019.09.17.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2019/V41/I6/19

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