功率超声波技术在低透气性煤层增透试验中的应用

Application of power ultrasonic technology in permeability increasing test of low permeability coal seam

为了增加低透气性煤层渗透率,提高预抽煤层瓦斯抽采效率,提出了一种安全高效的新型功率超声波技术来实现对煤层的增透,超声波增透煤层时通过破裂和声波扰动的方式增加了煤层透气性,这些方式的加载使得其原先裂缝不断地扩展、延伸,最终达到增透整个煤层的作用。将功率超声波技术应用于2130矿24312采煤工作面,采用回风巷顺层布孔的方式进行作业,现场试验结果表明:功率超声波增透技术显著提高了煤层瓦斯抽采浓度和抽采纯量,同时降低了瓦斯抽采钻孔的工程量。现场证明功率超声波技术作用于低透气性煤储层,提高了瓦斯抽采效率,对于矿井瓦斯高效抽采具有广阔的应用前景。

In order to increase the permeability of low-permeability coal seams and improve the efficiency of gas drainage in pre-drained coal seams,a safe and efficient new type of power ultrasonic technology was proposed to achieve the anti-reflection of the coal seam.When the ultrasonic was used to increase the coal seam′s permeability,it used cracking and acoustic disturbance.The air permeability of the coal seam was increased,and the loading of these methods causes the original cracks to continue to expand and extend,and finally achieve the effect of enhancing the permeability of the entire coal seam.The power ultrasonic technology was applied to the 24312 coal mining face of the 2130 mine,and the return airway was used to arrange holes along the layer.The field test results showed that the power ultrasonic anti-reflection technology significantly improved the coal seam gas drainage concentration and drainage scalar volume.And at the same time reduced the amount of gas drainage drilling.It had been proved on the spot that the power ultrasonic technology acts on the low-permeability coal reservoirs,improved the efficiency of gas drainage,and had broad application prospects for high-efficiency gas drainage in mines.