顺层钻孔抽采有效半径影响因素及测定方法研究

基于顺层钻孔抽采瓦斯气-固耦合模型,从煤层赋存参数、抽采参数两个方面分析有效半径影响因素,表明:初始渗透率对有效半径影响最大;其次是初始瓦斯压力,与有效半径成反比关系;抽采时间在很大程度上控制着有效半径,有效半径的测定应与抽时间建立关系。提出以抽采残余瓦斯含量为考察指标的有效半径测定方法,建立有效半径与抽采时间的关系,进而结合具体矿井采-掘-抽接替计划确定有效半径,测定更为普遍适用,该方法在霍尔辛赫煤矿得到了验证。

Research factors and measuring method of effective radius for gas drainage using hole drilled along seam

Based on gas-solid coupling model of gas extraction using hole drilled along seam, analyzed the factors of form parameters of coal and gas drainage. It showed that permeability was main controlling factors, gas pressure was second and inversely proportional to effective radius, drainage time controlled effective radius heavily, and measuring method of effective radius should establish the relationship with drainage time. Proposed measuring method of effective radius based on residual gas content, established the relationship between effective radius and drainage time, and determined effective radius with the plan of mining-extraction-drainage. Measuring method was more generally applicable and tested in Huoerxinhe Coal Mine.