在现行的本煤层抽放瓦斯工作中,一般的说,在煤层揭露以后,都有一定的释放能力,因而在理论上任何煤层都具有可抽性。但是由于煤质、地质、瓦斯赋存状况的差异,煤层抽放瓦斯的难易程度,抽放效果,实际上就很不相同。所以,寻求矿井有效的抽放瓦斯方法,提高抽出率、在目前还是一项有重要意义的研究课题。国内外研究表明,化学的、物理的方法,其中包括水力措施改变煤层透气性,加大孔径,采取下向钻孔,提高抽放负压等一系列试验项目都在积极摸索中,有的已经收 In the current coal seam drainage operation, it is generally said that after the coal seam has been exposed, there is a certain release capacity, and therefore any coal seam is theoretically pumpable. However, due to the difference of coal quality, geology and gas occurrence, the difficulty of gas drainage in coal seams and the drainage effect are actually very different. Therefore, to find an effective mine gas drainage method to improve the extraction rate is still an important research topic. Domestic and foreign research shows that a series of pilot projects such as chemical and physical methods including hydraulic measures to change the permeability of coal seam, increase the pore size, adopt downhole drilling, and increase drainage negative pressure are all actively explored. Some of them have already been explored Close