利用自主研发的多场耦合煤层气开采物理模拟试验系统，开展了不同钻孔数量条件下顺层钻孔抽采瓦斯试验，发现抽采瓦斯过程中煤体应变、瓦斯流量、瓦斯压力及煤体温度呈现出显著的耦合特性，均表现出抽采前期快速变化而后平稳发展的整体趋势，钻孔数量的增加能有效降低抽采时间并提高抽采效率；通过MATLAB编程实现了抽采瓦斯过程中瓦斯压力云图、等压面以及切片图的多维可视化，抽采瓦斯过程中瓦斯压力下降区域近似呈现以钻孔走向为长轴方向的椭球形态，并逐渐向外扩展；基于煤层瓦斯压力分布研究了消突区域的动态演化，消突区域以各钻孔为中心近似呈现圆形分布，不同消突区域受钻孔叠加效应影响逐渐相互融合，最终实现了煤层的消突。研究成果为实现抽采数据可视化和瓦斯高效精准抽采提供了参考和思路。

The parallel borehole drainage experiments with different borehole amounts were conducted based on the self-developed multi-field coupling test system for coal-bed methane (CBM) drainage. The different parameters during gas drainage showed the similar evolution which dropped quickly at first and then leveled off. It can be concluded that increasing boreholes amount can improve the drainage efficiency and reduce drainage time effectively. The visualizations of gas pressure cloud maps,isobaric surfaces and slice maps were realized by MATLAB software. During gas drainage,the gas pressure dropping zone expanded outward with the shape of ellipsoid and the borehole direction was the long axis direction. At the same time,the dynamic evolution of outburst elimination zone was plotted based on gas pressure. The outburst elimination zones propagated outward in multiple approximate circles with the multiple boreholes as their respective centers. However,the multiple outburst elimination zones gradually merged together and formed a new outburst elimination zone to realize outburst elimination of the coal seam. The research results provide a reference for the realization of gas drainage data visualization and gas precise drainage.

0 引言

1 试验装置及试验方案

   1.1 试验装置及传感器布设

   1.2 试验方案及试验步骤

2 试验结果及分析

   2.1 瓦斯抽采中煤层参数动态响应

   2.2 瓦斯抽采中煤层瓦斯压力可视化

   2.3 基于瓦斯压力可视化的消突区域动态演化

3 结论