No.11 Mine, Pingdingshan Tian'an Coal Mining Company Limited Mine Safety Branch, China Coal Research
Institute State Key Laboratory of Coal Mining and Clean Uilization

针对煤层底板承压水导致煤层瓦斯压力测试成功率低下的现状,通过建立底水锥进模型,提出考虑煤层钻孔开封比δ影响的测试方法,获取底水突破煤层时间,进而控制封孔时间,提高了煤层瓦斯压力测试成功率。研究发现,精确的底水突破煤层时间预测关系到封孔时间,决定了测试成败;在开孔深度一定的条件下,底水突破煤层时间与封闭煤层深度的三次方成正比关系;不同的开封比直接决定承压水锥进速度和突破煤层时间,一般选择范围0.1

According to a low success rate status of the seam gas pressure measurement caused by the floor confined water of the seam, with the establishment of the floor water coning model, a test method was provided in consideration of the seam borehole drilling and sealing rate δ influences, the time of the floor water to brea k the seam was obtained, thus the borehole sealing time could be controlled and the success rate of the seam gas pressure measurement could be improved. The stud y showed that accurate prediction of the time for the floor water to break the seam would be related to the borehole sealing time and would determine the successful or failure test. Under the certain condition of the borehole drilling depth, the time of the floor water to break the seam and the cubic of the sealed seam depth would be in a positive correlation relation. A different drilling and sealing rate would directly set up the confined water coning speed and the seam breaking time. Generally the sele ction scope would be 0.1