Three Region Linkage Three-Dimensional Gas Drainage Theory and Mode of Coal Bed Methane in Coal Mining Area

In order to realize the safety and high efficient coordinative development of coal and coal bed methane resources in the coal mining area,based on the ti me and space replacing law of the coal development,the coal mining area was divided into three regions,including the planning region,preparation region and productio n region.The gas drainage with the surface drilling wells,the combined drainage with the surface and underground boreholes,the gas drainage in the mining seam and d ifferent gas drainage technology were individually applied to ensure the safety and high efficient coal production.According to the mathematics model of the max gas co ntent allowed by the coal mine production,the numerical model of the seam gas pressure and the optimized experts system of the coal bed methane drainage,a regional progressive three-dimensional gas drainage model(Jincheng Mode) of three region linkage was created.The recovery rate of the coal resources was improved,an effecti ve connection of the industrial models with the underground mine gas drainage and the surface in-place gas drainage could be realized and the time and space contradi ction between the coal bed methane development and the coal mining was solved.