Study On Surface Pressure-relieved Methane Drainage And Extraction Multi-well

The study of solving the problem that the technologies of methane drainage for high gas low permeability seam in Xinji coal mine. Based on association method of releasing pressure mechanism, the theory of methane diffusion and permeation, computerized numerical simulation and practical experiments,and study on surface pressure-relieved methane drainage and extraction multi-well. The time-space laws of overlying rock movement after multi-seams mining.Firstly,the law of storage and transport in relieved pressure gas.To determine position of methane accumulation is the circle of pressure-relieved.Research on the calculation of coal pillar load and the methodology of numerical computation for the plastic deformation are proving broken coal pillar of 10 meters widen and both of the working face goaf area and overlying strata are joined up.Secondly based on the theory of methane diffusion and permeation and numeric simulation on drainage methane transporting process in fracture of coal rock by COMSOL is to obtained a normal distributions curve of methane in pore medium and Dracy permeation law flow to drainage muti well.Finally based on the trace practical experiments by gas chromatograph,is to obtained drainage range of pressure-relieved gas in strike and dip direction respectively exceed 240 meters and 160 meters and establish relation of gas drainage quantity, gas chroma and drainage negative pressure.The results of this study is to provide some evidence for the theory,and also gained referential value for reasonable design of multi-well had practical significance and a valuable reference.Figure[63] Table[15] Reference[58]...