Study on the application of gas drainage technology in bedding long drilling

In this paper, the mechanism of gas migration from coal mass to drilling is analyzed theoretically by the negative pressure change of bedding long drilling gas drainage, and based on the theory of fluid mechanics, the resistance equation of gas migration in drilling is deduced.Combined with the field test and research results of bedding long drilling in the underground driving face of the coal mine, this paper analyzes the variation law of negative pressure along the length of drilling in different sections, establishes the fluid-solid coupling model of bedding long drilling gas drainage, analysis the main controlling factors affecting the gas extraction effect.Through the analysis of the field application data, the advantages of gas extraction technology of long drilling gas drainage in this coal seam are confirmed.The research results can provide scientific basis for the popularization and application of bedding long drilling gas extraction technology in a large area.