Abstract: Taking the gas drainage of 12311 working face of Wangjialing Coal Mine as the engineering background,based on the analysis of the theory of gas drainage by high position borehole,the FLUENT software is used to study the gas distribution and migration in the goaf of working face.According to the simulation analysis results,the best gas drainage borehole arrangement method is determined.The rationality of the above simulation resutls is verified by the actual gas drainage results,which can provide realiable reference for the gas drainage under the similar engineering conditions of Wangjialing Coal Mine.

Key words: Gas drainage, High position directional borehole, Migration and distribution, Numerical simulation