Recently, success was reported from the directional drilling project for exploring goaf water accumulation at the Pinglu No.3 Underground Mine of China Coal Pingshuo Group. When drilling reached a fractured stratum at 650 meters depth, a large-scale water inflow occurred along with hole collapse and drill pipe sticking. Utilizing their targeted grouting technology for complex underground coal mine strata, the drilling technology team from China Coal Technology & Engineering Group Chongqing Research Institute (CCTEG Chongqing Research Institute) successfully performed ultra-long-distance precise grouting reinforcement. This allowed the drill hole to safely traverse the complex section, ultimately reaching the designed depth of 1101 meters, setting a new industry record for long-distance targeted grouting drilling.

China's coal mines often face complex and variable geological conditions. During the construction of underground directional drill holes, issues like hole collapse, poor cuttings removal, and pipe sticking frequently occur in complex strata, severely impacting achievable hole depth and efficiency, and potentially triggering safety incidents. To solve this industry-wide challenge, the drilling technology team at CCTEG Chongqing Research Institute, after three years of dedicated R&D, successfully developed a complete set of technology and equipment for "targeted grouting reinforcement and hole protection in complex underground coal mine strata." This system enables precise positioning and efficient grouting at any target segment within the borehole, consolidating fractured rock masses. It has more than doubled the construction efficiency and success rate of directional drilling in complex formations, while significantly reducing construction costs and safety risks.

In this Pinglu No.3 Mine project, the team focused on the ultra-long-distance fractured section between 650 and 690 meters depth. Through precise targeted grouting operations, they successfully resolved the challenges of high-pressure water inflow and borehole wall instability, ensuring the drill hole safely advanced to the planned 1101-meter depth. This significantly enhanced the reliability and safety of the goaf water exploration and drainage project, marking the successful practical application of this technology.

Currently, this technology has been promoted and applied in multiple mining areas across Shanxi, Jiangsu, Guizhou, Henan, and other provinces, aiding over ten mines in overcoming construction bottlenecks in complex strata. Moving forward, CCTEG Chongqing Research Institute will continue to optimize the technical parameters and equipment performance, expanding its applicability to different geological conditions. This effort will support the coal industry in achieving safer, more efficient, and greener mining practices, injecting powerful momentum into safeguarding national energy security.