瓦斯抽采过程中本煤层及邻近层储层参数演化特征
Evolution characteristics of reservoir parameters of drainage layer and adjacent layer in the process of gas drainage
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摘要: 利用大型多场耦合煤层气开采物理模拟试验系统，开展了近距离煤层群瓦斯抽采试验，分析了抽采过程中本煤层和邻近层瓦斯压力演化、煤层变形演化以及瓦斯压力与煤层变形耦合关系。结果表明：抽采过程中本煤层瓦斯压力呈先快后慢的下降趋势，距钻孔中心位置越近，瓦斯压降速率越大；邻近层瓦斯压力则呈近似线性下降，瓦斯压降空间差异性相较本煤层不明显；随抽采进行，本煤层变形增长速率逐渐减小；邻近层变形演化规律与本煤层基本一致，但相同时刻邻近层变形相较本煤层更小；本煤层与邻近层压降均随体积应变增大而增大，但本煤层压降与体积应变耦合关系为线性正相关关系，而邻近层压降与体积应变耦合关系为正指数函数关系。Abstract: Using a large-scale multi-field coupled coalbed methane exploitation physical simulation test system to carry out gas drainage test of close distance coal seams, and the evolution law of gas pressure, deformation and their coupling relationship of each coal seam were analyzed. The results showed that: the downward trend of gas pressure in drainage layer gradually slowed down. The closer to the center of the borehole, the greater the pressure drop rate; the gas pressure of the adjacent layer showed an approximately linear downward trend, and the spatial difference of gas pressure drop was not obvious compared with drainage layer. As the drainage progresses, the rate of deformation increase in the drainage layer gradually decreases; the deformation evolution law of the adjacent seam was basically the same as the drainage layer, but the deformation of the adjacent layer at the same time was smaller than that of the drainage layer. The pressure drop of drainage layer and adjacent layer all increased with the increase of volume strain, the coupling relationship between drainage layer pressure drop and volume strain was a linear positive correlation, but the coupling relationship between adjacent layer pressure drops and volume strain was a positive exponential function relationship.
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