It has important significance for the development of coal industry to study coal mine gas drainage, improve existing gas drainage through borehole design, optimize borehole parameters, improve coal mine gas drainage rate, and reduce gas accidents. Currently, gas extraction in coal mine is the main method to solve gas outburst, gas explosion, and other gas disasters. Directional drilling technology series#Therefore, the elimination of a series of gas accidents such as coal mine gas explosion and gas outburst is an important issue in coal mine safety production at present. The total number of coal and gas outburst events in China accounts for more than one-third of the total number of coal and gas outburst events in the world. However, the geological conditions of coal seam occurrence in China are very complicated, and the permeability of coal seam is low, which leads to the emergence of many risk factors in the process of coal mining, among which the gas disaster is the most serious. Therefore, in a long period of time in the future, the importance of coal resources to China’s economic development is self-evident. Even under the goal of low-carbon economy, China’s demand for coal resources is still very large. Although the proportion of coal consumption in China has decreased, coal still occupies a dominant position in China’s primary energy consumption. IntroductionĪccording to data from the Ministry of Ecology and Environment of China, from 2010 to 2020, the proportion of coal consumption in China’s primary energy consumption structure decreased from 69.2% to 56.8%. Directional drilling is better than conventional drilling in work, with good drainage stability and large gas drainage volume, which can greatly reduce the outburst time and improve the gas drainage rate. The results indicate that the directional drilling is more suitable for Baode Mine 81306 working face of coal seam 8 gas extraction operation. According to the experimentation of Baode Mine, the data of gas drainage volume of conventional directional drilling are recorded and analyzed. Through the combination of numerical simulation and field experimentation, the stress distribution around borehole is analyzed, and the influence of different time, different gas pressure, different negative pressure of extraction, and different permeability of coal body on directional borehole is simulated. In order to improve the rate of gas extraction, directional long drilling is used to replace conventional drilling for coal seam gas extraction. The effect of traditional gas extraction drilling on ultrathick coal seam is not well. Gas extraction is an important way to control gas disasters.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |