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Methane displacement characteristic of coal and its pore change in water injection

机译：煤的甲烷位移特征及其注水中的孔隙变化

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Coalbed methane as one type of clean energy has become an important gas resource recently. High-pressure water injection in coal seams is an effective approach for improving gas extraction efficiency, which is determined by the gas displacement characteristic and pore structure of coal. To investigate the gas displacement characteristics in coal and its pore response and influential factors, gas adsorption and water injection experiments were conducted under different conditions. The results show that the gas displacement caused by the water injection undergoes three stages: rapid increase, slow increase, and almost constant. The wetting process in water injection includes three processes: wetting, soaking, and spreading, and the wettability of coking coal is best, followed by lean coal and anthracite. The amount of gas driven by the water increases with increasing water injection pressure, and it is more favorable to increase the injection pressure to improve the gas displacement effect under the relatively low injection pressure. The lower the coal rank, the better the gas displacement effect due to the higher porosity of the coal, and the longer the early gas displacement stage. The high adsorption equilibrium pressure can improve the gas displacement effect; for the relatively high adsorption equilibrium pressure, the gas displacement effect is better. After water injection in coal, the large fractures and pores dramatically increase in size, especially for the low metamorphic coals coking coal, contributing to the majority of the increase in porosity. The results of this study can provide a theoretical foundation for the wide application of water injection technology for efficient gas drainage in coal mines.
机译：煤层甲烷作为一种清洁能源已成为最近的重要燃气资源。煤层中的高压注水是一种有效的改善气体提取效率的方法，该方法是由煤的气体位移特征和孔隙结构决定的。为了研究煤中的气体位移特性及其孔隙反应以及影响因素，在不同条件下进行气体吸附和注水试验。结果表明，注水引起的气体位移经历三个阶段：快速增加，增加缓慢，几乎恒定。注水中的润湿过程包括三种方法：润湿，浸泡和涂抹，焦化煤的润湿性最佳，其次是瘦煤和无烟煤。随着水喷射压力的增加，由水驱动的气体量增加，并且更有利地增加注射压力，以改善相对低的注射压力下的气体位移效应。煤级较低，由于煤的孔隙率较高，较好的气体位移效果越好，早期气体排量阶段越长。高吸附平衡压力可以提高气体位移效果;对于相对高的吸附平衡压力，气体位移效果更好。在煤中注射注射后，大骨折和孔隙的尺寸显着增加，特别是对于低变质煤焦煤，促成大部分孔隙率。该研究的结果可以为煤矿中有效燃气排水的广泛应用提供理论基础。

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