关键词: 煤矿井下, 筛管完孔, 穿层孔, 煤孔段, 可脱式定位接头

Abstract: Aiming at the problems in the application of this technology in the cross-measure borehole, such as poor reliability of fixaton, high cost of full-hole screen pipe,the optimal jaw length of the suspension device was studied and the drill bit was optimized.The application results show that the jaw length is 95mm, which is reliable in the commonly used 103mm high inclination hole, the drill bit has high drilling efficiency and the bit opening is reliable.Under the same drainage conditions, compared with the same number of open holes, the gas drainage concentration and drainage flow rate increased by 26% and 78% respectively. In the late period of the nine-month drainage period, the average increase of drainage flow rate increased by 20%. The method of screen pipe running in the coal hole section was also proposed, the detachable positioning device was designed, and the technology of screen pipe compeletion in cross-measure borehole was improved, which provided a technical idea for the completion of positioning screen pipe of the coal hole section in cross-measure borehole.