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China's coal mine underground near horizontal directional drilling depth of 2311 meters world record
Recently, the reporter learned from Xi'an Research Institute Co., Ltd. (hereinafter referred to as Xi'an Research Institute) of China Coal Science and Technology Group (hereinafter referred to as Xi'an Research Institute) that the results of the National Science and Technology Major Special Project undertaken by the Institute "High Power Directional Drilling Technology and Equipment" in Shendong Baode Coal Mine Successfully drilled the ultra-long directional drilling of the coal seam with a main hole depth of 2311m, breaking the world record of 1881m directional drilling depth set by the Institute in the Sihe Coal Mine of the Shanxi Coal Group in 2014, refreshing the current Australian company in the Metropolitan mine. The world record of 2151m hole depth marks a major breakthrough in China's coal mine directional drilling technology and equipment. Coalbed methane (commonly known as gas) is a kind of self-storing unconventional natural gas mainly in the state of adsorption, which is mainly composed of methane. In the process of coal mining, when the concentration of gas in the air reaches 5%-16%, it will explode when exposed to open flames, which is the root cause of coal mine gas accidents. In addition, if the gas released by coal mining is directly discharged into the atmosphere, its greenhouse effect is about carbon dioxide. 21 times, it is extremely destructive to the ecological environment. Coalbed methane (gas) is a kind of clean energy and high-quality chemical raw materials. The calorific value of 1 cubic meter of pure gas is equivalent to 1.13kg of gasoline and 1.21kg of standard coal. Its calorific value is equivalent to that of natural gas, and it can be mixed with natural gas. It is very clean after burning and produces almost no exhaust gas. Therefore, the development and utilization of coalbed methane (gas) is of great significance to alleviate the tension of conventional oil and gas supply in China, improve the safe production conditions of coal mines, implement the sustainable development strategy of the national economy, and protect the atmospheric environment. China's coal seams have complex geological conditions, high gas content in coal seams, high pressure, frequent gas disasters, which seriously affect the mining of coal. The use of drilling to extract coalbed methane is a common and effective method at home and abroad. Xi'an Research Institute has carried out a large number of drilling technology research, equipment development and technical consulting services since the 1960s, and has focused on solving the exploration and release water encountered in coalfield geological exploration and coal mine safety production. Major drilling technical problems such as construction, coalbed methane (gas) drainage (production), aquifer reconstruction and aquif reinforcement, and completed more than 210 national science and technology major projects, national and provincial level research projects, and won the national There are 2 scientific conference awards, 3 national science and technology progress awards, and 56 provincial and ministerial-level scientific and technological achievements awards. Among them, “Study on the drilling performance of synthetic diamond drill bits and the synthesis of synthetic diamond in coal field drillingâ€, “Research and test of rope coring and fishing device†won the National Science Conference Award, “The tunnel drilling rig and the near horizontal hole directional drilling technology. The “Project†won the second prize of National Science and Technology Progress Award, and the “Research on Gas Comprehensive Management Technology of Yangquan Mining Bureau†won the third prize of National Science and Technology Progress Award. The research results have been promoted and applied in geological exploration and coal mine safety production, providing important technical support for coalfield geological exploration work and coal safe mining. With the continuous improvement of China's coal mine production technology and equipment level, mine safety and efficient production have raised higher requirements for mine gas area, precise treatment and gas clean utilization. Under the new situation, the use of traditional rotary drilling technology to construct coal seam gas drainage holes has exposed many problems, mainly reflected in: low construction precision, slow construction speed, uncontrollable drilling trajectory, and inability to adapt to the top and bottom of the coal seam. Insufficient footage, low utilization of drilling and small amount of single-hole gas extraction can not meet the actual production needs. In 2002, domestic coal mining enterprises gradually began to introduce coal mine directional drilling technology and equipment from abroad for directional drilling of gas drainage in coal seams. The directional drilling technology in coal mine can realize the precise control of the drilling trajectory, ensure the effective extension of the drilling trajectory in the predetermined horizon, increase the effective drainage distance of the drilling hole, and improve the gas drainage efficiency. In addition, the directional drilling technology can be carried out. Multi-branch hole construction, the construction of the drilling can evenly cover the entire working surface, with the advantages of high drilling efficiency, multi-hole, centralized extraction, etc., play an important role in mine gas control. However, the advanced directional drilling technology and equipment while drilling is monopolized by foreign companies, and the high cost of equipment procurement and maintenance leads to high gas control costs. In response to this situation, Xi'an Research Institute has developed a series of coal mines since 2005, with the support of the National Development and Reform Commission and the Ministry of Science and Technology, relying on the national key research and development special projects, the “Eleventh Five-Year Plan†and the “Twelfth Five-Year Plan†national science and technology oil and gas major projects. Downhole directional drilling technology and equipment, innovatively developed 12000Nm high-power directional drilling rig, solved the problem of insufficient capacity of underground super long directional hole construction equipment; invented the coal mine underground explosion-proof wireless while drilling measurement system, realized the measurement signal transmission by " Wired to "wireless" leap; signal transmission distance of more than 2000m; developed a new technology for deep hole efficient directional drilling and drilling accident handling, drilling efficiency increased by 40%. The overall achievement reached the international leading level, and won the second prize of National Science and Technology Progress Award, the second prize of Shaanxi Science and Technology Progress Award, and the first prize of China Coal Industry Association. At present, the underground drilling technology and equipment of Xi'an Research Institute has been successfully promoted and applied in more than 20 mining areas in China, and plays a leading role in the efficient extraction of coalbed methane (gas) in coal mines. With the continuous improvement of directional drilling technology and equipment in coal mines, the depth record of directional drilling in coal mines has also been continuously improved. In 2008, it reached 1046m in the Tingnan mine in Shaanxi, and reached 1059m in Shanxi Sihe coal mine in 2010. Dongbaode Coal Mine and Shaanxi Dafosi Coal Mine reached 1111.6m and 1212m. In 2014, it reached 1881m in Shanxi Sihe Coal Mine. The depth of the main hole in the Shendong Baode Coal Mine reached 2311m, setting a new world record. The drilling construction was jointly undertaken by Xi'an Research Institute and Baodong Coal Mine of Shendong Coal Group. On-site combined with the need for gas area management in the super-long working face of Baode Coal Mine, in the second panel of Baode Coal Mine, the ZDY12000LD high-power directional drilling equipment of Xi'an Research Institute was used, and the “active topping + side drilling branch†and composite directional drilling were adopted respectively. Into the process technology, the full-hole drilling of the ultra-long directional drilling in the coal seam is realized in the coal seam, which overcomes the previous sliding directional drilling process. The pressure parameter of the drilling system increases rapidly with the increase of the hole depth, thus limiting the drilling capacity. technical challenge. Under the cooperation of both parties, the super-long directional drilling of the main coal seam with a depth of 2311m is completed. The drilling is topped for 15 times, the total footage is 3094m, the diameter is Ф120mm, the average daily footage is more than 200m, and the hole depth is more than 2000m. Achieve efficient directional drilling with a single shift of 90m.