A Method of Calculation of Apparent Gas Permeability for Tight Porous Media
A Method of Calculation of Apparent Gas Permeability for Tight Porous Media
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DOI：
10.1007/s11242-017-0972-3
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发表时间：
2017
影响因子：
2.7
通讯作者：
Anlun Wang
中科院分区：
文献类型：
--
作者：
Anlun Wang
致密气藏和页岩气藏以微米级和纳米级孔隙为特征。这种致密多孔介质中气体流动的描述由于多种流态共存而变得复杂。多孔介质通常用一束弯曲的毛细血管来表示，并且通过对单个毛细血管的流速进行数值积分来包含各种流态的贡献，这给实际应用带来了不便。本文分别推导了基于对数正态孔径分布和分形孔径分布的致密多孔介质表观渗透率的近似表达式，相对误差小于0.1。利用该表达式，致密多孔介质的视渗透率无需数值积分即可计算。已发表的数据验证了该方法的有效性。
Tight and shale gas reservoirs are characterized by pores in the range of micro- and nanometer. The description of the gas flow in such tight porous media is complicated by the coexistence of various flow regimes. Generally, porous media is represented by a bundle of tortuous capillaries and contributions of various flow regimes are incorporated by numerical integration of the flow rate of individual capillary, which causes inconvenience for practical application. In this paper, approximate expressions for apparent gas permeability of tight porous media with a relative error less than 0.1 based on the lognormal pore size distribution and the fractal pore size distribution have been separately derived. With the proposed expressions, apparent gas permeability of tight porous media can be calculated without numerical integration. The proposed method has been validated by published data.