大佛寺煤矿煤层气开采现状及技术应用

Current Situation and Technology Application of Coalbed Methane Mining in Dafosi Coal Mine

结合大佛寺煤矿煤层气赋存情况,本文开展煤质分析,绘制原煤红外谱图,分析煤层孔隙特征和渗透性、原煤对瓦斯的吸附特征,研究了煤层气开采技术,并提出改进措施。研究表明,随着压力增加,原煤对瓦斯的吸附量快速增大,加压初期,吸附速率较快。4号煤层的平均孔隙度为4.725%,平均渗透率为8.58×10^(-3)μm^(2),煤样孔隙度和渗透率范围较宽,两者正相关,线性关系较好。实践表明,多分支水平井技术最适用于大佛寺煤矿的煤层气开采。

Combined with the occurrence of coalbed methane in Dafosi Coal Mine,this paper conducts coal quality analysis and draws the infrared spectrum of raw coal,analyzes the pore characteristics and permeability of coal seams,the gas adsorption characteristics of raw coal,studies the coalbed methane mining technology,and proposes improvement measures.The research shows that with the increase of pressure,the gas adsorption capacity of raw coal increases rapidly,and the adsorption rate is faster in the initial stage of pressurization.The average porosity of the No.4 coal seam is 4.725%,and the average permeability is 8.58×10^(-3)μm^(2),and the coal samples have a wide range of porosity and permeability,they are positively correlated,and the linear relationship is good.Practice has shown that the multi-branch horizontal well technology is most suitable for coalbed methane mining in Dafosi Coal Mine.