1. Introduction
As the mining area shifts to deeper area, and in order to adapt to the long-term production planning of the mine, the idea of "pre-mining gas pre-mining in large panels" was put forward in Baode Coal Mine. That is, adopt ultra-long distance inseam directional drilling (more than 1500 meter deep) to carry out regional pre-drainage and reduce the gas content for medium and long-term plan coal field. It will relieve the hidden gas hazards for later mining and mining. Gas was pre-drained in the second panel of Baode Coal Mine, 81309, 81310, 81311, 81312, 81313 and other working faces of the third panel of the coal seam through the drilling of this coal seam in the 8th coal seam, to evaluate the technology and effect of the extraction system.
2. Treatment solution
Adopting ZDY12000LD drilling rig, ZDY6000LD(A) drilling rig, BLY460 mud pump truck and YHD3-1500 mud pulse wireless measurement while drilling system independently developed by CCTEG Xi’an Research Institute, Long distance inseam directional drilling borehole for gas drainage are conducted in 81309 , 81310, 81311, 81312, 81313 working face of Baode Coal Mine.
3. Construction situation
Undertake the gas drainage borehole drilling project of Shenhua Shendong Baode Coal Mine, mainly in the construction of coal seam gas area pre-drainage drilling in the second panel and third panel 81309, 81310, 81311, 81312, 81313 and other working faces of Baode Coal Mine. The total designed engineering volume is 460,000 m (of which, the directional gas pre-drainage borehole engineering volume is about 150,000 m, and the conventional gas pre-drainage borehole engineering volume is about 310,000 m). The conventional pre-drainage boreholes are constructed along the gate entry of the working face, and the boreholes are inclined along the No. 8 coal seam. The heights of the boreholes are between 1.2 and 1.6 m and the drilling depth is about 200 m.
4. Achieved accomplishment
As of the end of January 2020, 325,287 m has been completed, of which 97,834 m has been completed for directional borehole drilling and 227,453 m has been completed for conventional borehole drilling. The drilling quality is high and the extraction effect is remarkable, which guarantees the normal continuity of the mining faces and system roadways in Baode Coal Mine.
5. FAQ
Q1: What kind of work can your company do in this field?
A: We can solve the main gas drainage problems encountered in the process of mine exploration, construction, production and shutdown.
Q2: What are the advantages of your company compared with other companies?
A: We are committed to the design and construction of coal seam gas control in mines and have formed a complete set of coal seam gas control technology and equipment.
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