基于Boltzmann的煤层微孔道气体流动规律研究

发布时间：2018-02-16 05:14

本文关键词： 格子Boltzmann方法煤层气微孔道稀薄效应　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：煤层气属于非常规油气资源,是一种清洁优质的能源。然而煤矿安全事故频繁发生,严重威胁着煤矿的安全生产,已经成为煤炭企业中危害最大的事故。煤岩体作为一种双重孔隙结构介质的代表,许多结构复杂且随机分布的微观孔裂隙单元存于其中,孔裂隙壁面粗糙不平,且内部充斥大量气体分子。煤层气在微尺度孔裂隙中气体流动表现为可压缩性和稀薄性效应,流动规律偏离达西定律。本文通过扫描电镜法对煤岩体内微观孔裂隙内表面粗糙度进行研究,建立煤岩储层微观孔裂隙内表面粗糙度特征计算模型。并采用格子Boltzmann方法研究煤层气微观孔裂隙逾渗系统气体流动问题,从微观角度揭示煤岩体基质内气体流动规律,对进一步改善煤层气体的开采提供了强有力的理论指导和技术支持,具有重要的学术价值和现实意义。
[Abstract]:Coal bed methane (CBM) is an unconventional oil and gas resource, which is a kind of clean and high quality energy. However, coal mine safety accidents occur frequently, which seriously threaten the safety of coal mine production. Coal and rock mass, as a representative of dual pore structure medium, many micro-pore fracture units with complex structure and random distribution exist in them, and the wall of pore and fissure is rough and uneven. The gas flow of coalbed methane in micropore fractures is compressible and rarefied. The flow law deviates from Darcy's law. In this paper, the surface roughness of micro-pore and fissure in coal and rock is studied by scanning electron microscope. A model for calculating the internal surface roughness characteristics of micro-pore and fissure in coal-rock reservoir is established, and the gas flow problem in the percolation system of micro-pore and fissure of coal-bed methane is studied by using lattice Boltzmann method, and the gas flow law in the matrix of coal-rock mass is revealed from the microscopic point of view. It provides strong theoretical guidance and technical support for further improving the mining of coalbed methane, and has important academic value and practical significance.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD841

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