连续流量法中钻屑与瓦斯动态分离技术

针对钻孔瓦斯涌出初速度法存在的问题,提出了钻屑与瓦斯动态分离技术,采用了理论分析、正交实验与单指标极差分析的方法对瓦斯泄漏量的运移规律与影响因素、泄漏率曲线进行了研究.研究结果表明:钻屑与瓦斯动态分离技术在工程实践中具有可行性;影响瓦斯泄漏量的因素包括钻屑封堵段的长度、钻屑封堵段的直径、煤屑粒径、钻孔涌出瓦斯的总流量和煤电钻的转速,其中煤屑粒径的重要性大于煤电钻转速,远大于封闭段长度.研究结论对于钻孔瓦斯涌出初速度法的改进有一定的参考价值和指导意义.

Dynamic separation technology of drill cutting and gas in continuous flow method

To overcome the defects in gas emission initial velocity method,a technology of dynamic separation of drill cuttings and gas has been developed in this study.The migration characteristics and influencing factors of gas leakage,leakage rate curve are investigated using theoretical analysis,orthogonal experimental method and single index range analysis.The results show that: the method of dynamic separation of drill cuttings and gas is feasible in engineering practice;the factors influencing the gas leakage includes the length and diameter of drillhole blocking,the size of drill cuttings,the total flow of drill emission gas,and the rotational speed of electric coal drill.Among these factors,the size of drill cuttings is more important than the rotational speed of electric coal drill,far more important than the length of drillhole blocking.The study has a reference value and guiding significance for the improvement of gas emission initial velocity method.