基于COMSOL Multiphysics的瓦斯抽采有效钻孔间距的研究

Research on the rational distances between bores of Gas Drainage Based on COMSOL Multiphysics

为提高司马煤业3号煤层瓦斯抽采时钻孔布置的合理性与准确度,以煤介质的双重孔隙结构特征以及瓦斯流动理论为基础,根据质量守恒及Darcy定律,建立了气固耦合的瓦斯流动模型,并将其植入到COMSOL Multiphysics软件中进行模拟计算,得到了钻孔参数对瓦斯抽采的影响规律以及单排抽采孔布置方式下的有效钻孔间距,为现场瓦斯抽采钻孔的施工提供了理论支持与技术指导,避免了现场施工的盲目性,验证了所建立的瓦斯流动模型的有效性。

In order to improve the rationality and accuracy of bores arrangement when gas in Sima No. 3 coal seam is drained, based on the coal medium＇s double porosity structure characteristics and the gas flow theory, according to the law of conservation of mass, gas status equation and Darcy＇s law, establish the gas flow model to consider the diffusion-seepage action, hnplant the established gas flow model into the COMSOL to carry out the simulation calculation, we will get the influence law of drilling parameters on the gas drainage and effective distances between bores under single row arrangement pattern. Then the simulation results can provide theory support and technical guide for gas drainage site operation to avoid the blindness of site operation. Eventually, the effect of actual site practice confirm the validity of established gas flow model.