The ZDY15000LD directional drilling equipment and YCSZ coal mine underground borehole transient electromagnetic technology and equipment developed by CCTEG Xi'an Research Institute have achieved 1,026 meters of long-distance advance water hazard detection in Xundong Coal Mine recently, once again breaking the world record for the farthest advance water hazard detection, marking the maturity and development of the "long excavation and long exploration" water hazard advance detection technology in underground coal mines.
For many years, the tunneling of underground coal mines has been mainly carried out in the "short excavation and short exploration" mode, which is difficult to adapt to the needs of rapid tunneling. To this end, CCTEG Xi'an Research Institute innovatively proposed a new working mode of "long excavation and long exploration" using directional long drilling + borehole geophysical exploration. This method uses the completed directional long drilling and borehole transient electromagnetic technology to detect the range of 30m radial and more than 1000m deep in the borehole, and finally forms a spatial stereoscopic imaging of the full-space geological anomaly, providing reliable technical support for safe and long-term tunneling.
After the Xundong Coal Mine adopted directional drilling construction, in order to further explore the water hazards within the influence range of the planned tunnel, the borehole transient electromagnetic technology and equipment were used to detect the hydrogeological conditions 1026m ahead. Through advanced borehole geophysical exploration, it is estimated that the mine will save 33 days of short-distance drilling time, more than 3 million RMB in drilling costs, and more than 1.66 million RMB in labor costs.
Long-distance borehole transient electromagnetic detection of more than 1,000 meters underground in coal mines provides a new working method for long-distance advanced and accurate detection of coal mine water hazards, and also provides reliable geological guarantee for the geological transparency of rapid excavation tunnels in coal mines.
