本煤层顺层瓦斯抽采钻孔有效长度研究

Research on Effective Length of In-seam Gas Drainage Drilling

通过分析钻孔周围瓦斯的流动模型,运用数学的方法推导本煤层抽采钻孔瓦斯涌出量的理论计算公式。比较抽采钻孔的实际抽采瓦斯量与理论计算得到的抽采瓦斯量,得到抽采钻孔的实际有效长度,建立钻孔有效长度与总长度的关系。这一结论的研究意义在于可以大概定位钻孔塌孔的位置,对解决钻孔塌孔、提高煤层瓦斯抽采效果有实际的指导意义。

By analyzing the gas flow law around the gas drilling,derivation theoretical calculation formula of gas Emission of drilling gas drainage by using mathematical method. Compare borehole actual amount of gas drainage drainage and amount of gas theoretical calculated,get actual effective length of drilling gas drainage,build the relationship between total length and effective length. Significance of this finding is that you can probably locate the collapse position of the drilling,has practical significance to solve drilling collapse,improve coal seam gas extraction effect.