Discussion on the theory of CBM well layout based on coordinated mining of CBM and coal

CBM development has comprehensive benefits of resources, safety and environmental protection in coal mining area. The paper studied the control mechanism of the mutual influence of CBM development and coal mining and analyzed the main influencing factors including damage of CBM casing and cement, proppant to coal mining machinery, metal casing collision sparks, quartz sand proppant fracturing, fracture of roof and floor by fracturing, and the destruction of coal mining to the wellbore. Based on the coordinated mining, combined with "O" ring theory, mining production planning should be considered as a priority in CBM well layout. Based on the possibility of CBM wells in different coal mining areas, the coal pillar is considered as the best position, and horizontal well is a preferred method. The results have a certain practical significance for CBM safe and efficient development in coal mining areas.