The investigation of fracture aperture effect on shale gas transport using discrete fracture model
The investigation of fracture aperture effect on shale gas transport using discrete fracture model
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DOI：
10.1016/j.jngse.2014.09.029
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发表时间：
2014-11
影响因子：
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通讯作者：
Lidong Mi;Hanqiao Jiang;Junjian Li;Tao Li;Yeh Tian
中科院分区：
文献类型：
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作者：
Lidong Mi;Hanqiao Jiang;Junjian Li;Tao Li;Yeh Tian
采用离散裂缝模型（DFM）数值模拟方法研究了页岩气在裂缝性多孔介质中的运移规律。采用一种新的渗流数学模型，即裂隙中渗流满足“立方定律”，基质满足“非达西定律”，通过求解非线性偏微分方程，利用有限元分析方法模拟裂隙开度对渗流特性的影响。在该模型中，流体仅通过与之相连的裂隙进入被不渗透岩石基质包围的井筒，模拟随机生成的裂隙网络，研究裂隙多孔介质中流体的流动和输运特性。给出了同一天然裂缝模型中不同裂缝开度的几种情况。初步模拟结果表明，天然裂缝和水力裂缝的开度对页岩气运移和产量都有显著影响。
Discrete fracture model (DFM) numerical simulation is used to investigate the shale gas transports in fractured porous media in this paper. A new seepage flow mathematic model, in which flow in fracture meets “Cubic law” and matrix meets “non-Darcy law”, is adopted and fracture aperture effect on the transport behavior is simulated by solving the nonlinear partial differential equations using finite element analysis (FEA). In this DFM, fluid flows into wellbore which is surrounded by impermeable rock matrix is merely through fractures that connect to it. The model is used to simulate a random generated fractures network to study the flow and transport characteristics in fractured porous media (FPM). Several cases with different fracture aperture in same natural fractured model are given. The preliminary simulation results show that both the natural and hydraulic fracture aperture have a significant impact on shale gas migration and production.