低渗透煤层气－水两相渗流实验研究及细观力学分析

项目名称： 低渗透煤层气－水两相渗流实验研究及细观力学分析

项目编号： No.50874082

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 刘建军

作者单位： 武汉轻工大学

项目金额： 34万元

中文摘要： 针对我国煤层气储层低渗透、低压力、低饱和度的地质特点，开展了不同有效压力、不同驱动压差、不同含水饱和度条件下的煤层气-水两相渗流实验系列研究，给出了不同有效压力对煤层气-水两相渗流影响以及煤层气解吸-变形作用规律；根据煤样的扫描电镜和CT图像，构建了煤体孔隙-微裂隙双重孔隙结构模型；基于多相流体力学理论、瓦斯吸附理论和扩散理论，建立了能够反映煤层气解吸-扩散-渗流过程的煤层气-水两相流体在煤体双重介质中运移的数学模型，并给出了有效数值解法；通过细观尺度的数值模拟和解析分析，研究了煤层气吸附解吸和变形对煤层气-水两相宏观渗流的影响，揭示了两相流体在低渗透煤层中的运移机理；通过数值模拟，研究了井位分布、井位密度、解吸特性、流固耦合效应等对煤层气产能的影响。本项目取得的研究成果对于发展和完善煤层气渗流理论，预防煤矿瓦斯灾害、促进我国煤层气产业的发展具有重要的理论意义和实用价值。

中文关键词： 煤层气；细观；渗流；实验；机理

英文摘要： In view of the low permeability, low pressure, low saturation geological features of coalbed methane reservoir in our country, series experiments under different effective pressure, different driving pressure and different water saturation conditions were done to investigated the influnce of effective pressure on coalbed methane and gas two-phase flow and the interaction between adsorption/desorption and deformation. According to SEM and CT image, pore-fracture dual porosity system of coal sample were reconstructed. Based on multi-phase fluid mechanics, gas adsorption and dispersion theory, mathematical model which can describe the coalbed methane desorption-dispersion-seepage process were established. Through micro numerical simulation and theoretical analysis, the influence of gas desorption and deformation on two-phase flow were studied. Lastly, through numerical simulation, the effect of well pattern, well density, desorption feature and fluid-solid coupling on coalbed methane capacity were studied. The research results obtained for the development and perfection of coal-bed methane percolation theory, prevention of coal mine gas disaster, promote coalbed methane industry development has important theoretical significance and practical value.

英文关键词： coalbed methane;microscopic;porous flow;experiment;mechanism