Key technology of efficient drilling and mining in extremely thin coal seam

doi:10.16265/j.cnki.issn1003-3033.2023.07.0421

Abstract

Abstract:

In order to improve the drilling ratio and gas extraction efficiency of extremely thin coal seam, the drilling construction equipment was improved through numerical calculation and field test. The key drilling and production technology was put forward by combining the directional drilling system with the azimuth gamma-ray logging instrument while drilling. Combining with the medium-high pressure hydraulic impactor, a new technology suitable for extremely thin coal seams was formed. The results show that the length of the lower non-magnetic tube is shortened to 2 m, which can effectively improve the measurement accuracy of drilling system and meet the exploration needs of the extremely thin coal seam. The coupling degree between the actual trajectory and the design trajectory of the drilling construction is high. The actual trajectory and the gangue trajectory are controlled within the target area, and the whole process monitoring and trajectory control of the drilling trajectory are realized. The average drilling ratio of the extremely thin coal seam is about 88%, which is increased by nearly 40%. Combined with the rock breaking drilling construction method of medium-high pressure hydraulic impactor, the accidents such as hole collapse and sticking in the drilling process are effectively solved, the hole forming rate of the borehole is improved, and the equipment system suitable for extremely thin coal seam is formed. The drilling efficiency is increased by 3 times, and the gas drainage purity has been increased by more than 3.8 times.

Key words: thin coal seam, efficient drilling, key technology, drilling ratio, measurement while drilling, azimuthal gamma while drilling, gas extraction

XU A'meng, HU Yang, YIN Li, JIA Jinzhang, YANG Tao. Key technology of efficient drilling and mining in extremely thin coal seam[J]. China Safety Science Journal, 2023, 33(7): 98-104.

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组号	见煤起止井段/m	见煤起止段长/m	非煤层段长/m	钻遇率/%
1	96~495	399	48	88
2	135~447	312	33	89