潘三矿下保护层开采条件下地面钻孔瓦斯抽采技术及效果

基于潘三矿13-1煤层的赋存条件,介绍了潘三矿地面钻孔抽采被保护层卸压瓦斯试验过程,研究了地面钻孔瓦斯抽采量、瓦斯抽采率及抽采后的残余瓦斯压力和瓦斯含量等4个方面。结果表明:保护层开采使得6个钻井累计瓦斯抽采量达到8105335m3,平均瓦斯抽采率达到54.1%,瓦斯抽采后煤层中残余瓦斯压力为0.21MPa,残余瓦斯含量为2.07m3/t,均低于《防治煤与瓦斯突出规定》中规定的临界数值,防突效果显著。

Methane Drainage Technology and Its Effect of Surface Drilling Hole under the Condition of Protective Coal-seam Mining in Pansan Colliery

On the basis of occurrence condition of 13-1 coal-seam in Pansan Colliery,this paper introduced surface methane drainage test.Methane drainage amount,drainage ratio and residual methane pressure and methane content were researched.Results showed that methane drainage amount of 6 boreholes after protective coal-seam mining reached 8105335m3,average methane drainage ratio reached 54.1% and residual methane pressure was 0.21MPa after drainage and residual methane content was 2.07m3/t,which were lower than limit values set in Preventing Coal and Methane Bursting Formulation.Bursting prevention effect was prominent.