顺层瓦斯抽采钻孔内负压分布规律研究

Research on Negative Pressure Distribution Law for Bedding Gas Extraction Borehole

通过理论分析,假定钻孔孔壁瓦斯流入的3种形式,建立简单的数学模型,得出了顺层瓦斯抽采钻孔内负压分布的规律,推导出顺层瓦斯抽采钻孔的极限长度并进行了实例的计算。针对传统抽采方法,结合瓦斯抽采钻孔内负压分布规律提出了改进的建议并进行比较,阐述了新式抽采方法的优越性。

Assumed three forms of drill hole wall methane inflow through the theoretical analysis, the article set up simple mathematical model, obtained negative pressure distribution law for bedding gas extraction borehole, and derived limit length of for bedding gas ex- traction borehole and performed the demonstration calculation. The article put forward improvement suggestions which combined with the negative pressure distribution law of drilling for bedding gas extraction in view of the traditional extraction methods, described ad- vantages of new extraction method.