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Numerical investigation of gas flow rate in shale gas reservoirs with nanoporous media

机译：页岩气藏纳米多孔介质瓦斯流量数值研究

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摘要

Theoretical analysis of transport mechanism of gas flow in shale gas reservoirs with nanoporous media i was carried out on the basis of molecular kinetic theory. The motion equation and mathematical model i of shale gas transport in multi-scale medium are established in this article. The pressure distribution equation of radial flow was derived, and the computing method of the control area of gas well was presented. Additionally, the volume flow rate equations of vertical and horizontal fractured wells were obtained. Through Newton iterative method, volume flow rate was analyzed, considering various factors such as production pressure drawdown, fracture half-length, fracture conductivity, fracture spacing and diffusion coefficient. According to the numerical results, the volume flow rate of the gas well increases when the diffusion coefficient grows. Consequently diffusion in shale gas reservoirs with nanoporous media plays an important role. With increase of fracture half-length, the volume flow rate increases first and then tends towards stability. Moreover, for certain length of the horizontal wellbore, when fracture spacing increases and the number of the fractures lessens, the control area and the volume flow rate of the gas well decreases. Therefore, there is an optimum allocation among these factors to achieve maximum volume flow.
机译：在分子动力学理论的基础上，对页岩气纳米多孔介质i气藏运移机理进行了理论分析。建立了页岩气在多尺度介质中运移的运动方程和数学模型。推导了径向流压力分布方程，提出了气井控制面积的计算方法。另外，获得了垂直和水平压裂井的体积流量方程。通过牛顿迭代法，考虑了生产压力下降，裂缝半长，裂缝电导率，裂缝间距和扩散系数等多种因素，分析了体积流量。根据数值结果，当扩散系数增大时，气井的体积流量增加。因此，在具有纳米孔介质的页岩气储层中的扩散起着重要作用。随着裂缝半长的增加，体积流量首先增加，然后趋于稳定。而且，对于一定长度的水平井眼，当裂缝间距增加并且裂缝数量减少时，控制面积和气井的体积流量减小。因此，在这些因素之间存在最佳分配以实现最大的体积流量。

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  • 来源
  • 作者

    Hongqing Song; Mingxu Yu; Weiyao Zhu; Peng Wu; Yu Lou; Yuhe Wang; John Killough;

  • 作者单位

    School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China,Department of Petroleum, Texas A&M University, Texas 77843, USA;

    School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    State Development Investment Corp, Beijing 100034, China;

    School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    Department of Petroleum, Texas A&M University, Texas 77843, USA;

    Department of Petroleum, Texas A&M University, Texas 77843, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Shale gas; Nanoporous media; Diffusion; Fracture; Flow rate;

    机译：页岩气纳米多孔介质;扩散;断裂;流量;

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