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

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

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。

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.