Recently, Xi'an Research Institute made a major breakthrough in the high-power directional drilling technology and equipment field. And the directional drilling along the coal seam with the main hole depth of 3353m has been successfully completed. To create a new hole depth record along the coal seam directional hole.
This test is based on the need of gas control in large area of Baode Coal Mine to use ZDY15000LD high-power directional drilling rig, BLY460/13 mud pump truck, YHD3-3000 mud pulse wireless measurement system, flushing fluid purification circulation system and other equipment. And they use drag reduction and trajectory control of ultra-long directional drilling sliding drilling to penetrate the drilling hole. The drilling time is 21 days, with a total footage of 4428m and an average footage of more than 210 m per day.
On September 11, China Coal Industry Association organized experts to visit Baode Coal Mine. Experts attended the meeting, visited the underground construction site and listened to the report of the project team. After inquiry and discussion, they believed that the pressure drag reduction and compound rotary branch drilling technology developed by Xi'an Research Institute for ultra-long drilling tools in underground coal mine to have overcome the difficulties of high-efficiency drilling pressure transmission and precise trajectory control in ultra-long directional drilling, and formed a perfect near-level and over-level drilling technology. The long-hole directional drilling technology has achieved a major breakthrough in directional drilling ability along coal seam from 2000 m to 3000m, and provided an efficient drilling technology for gas drainage in large area of coal mine before mining. The pre-completed super-long directional boreholes of 2311 m and 2570 m in depth were drilled by Xi'an Research Institute. The average daily gas extraction volume of single borehole was more than 3000 m3, and the stable time of gas extraction volume reached 650 days and 239 days respectively.
The successful implementation of 3353m directional drilling along super-long coal seam is a new milestone in the development of directional drilling technology and equipment of Xi'an Research Institute, which marks a new step in the equipment and technology level of directional drilling in China's underground, and is of great significance to the study of pre-mining gas extraction technology in large pan area of high gas mine.
Yao Ningping and Liu Cheng, deputy general managers of Xi'an Academy of Sciences, heads of relevant departments and technicians of the Academy participated in the on-site inspection meeting.
