| CO2致裂技术在煤层瓦斯抽采中的应用研究 |
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| 引用本文： | 徐开林,周波. CO2致裂技术在煤层瓦斯抽采中的应用研究[J]. 中州煤炭, 2018, 0(6): 9-12. DOI: 10.19389/j.cnki.1003-0506.2018.06.002 |
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| 作者姓名： | 徐开林 周波 |
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| 作者单位： | （1.贵州致远矿业开发有限公司，贵州 贵阳 553523； 2.贵州湾田煤业集团有限公司 湾田煤矿，贵州 贵阳 553523） |
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| 摘 要： | 针对目前瓦斯治理困难、抽采效率低，且现存的增透抽采技术存在潜在危险、抽采效果差等问题，运用机理分析、数值模拟和工业试验等综合方法，论述了液态CO2相变致裂技术装备组成和致裂基本原理；同时使用FLUENT软件对相关技术参数进行了数值模拟和系统优化。结果表明:CO2致裂利用高压气体破碎煤岩体，增大了煤岩层的透气效果；模拟结果得出“c”结构平直圆柱形为释放孔最优结构，且释放最优直径和压力分别为25 mm和276 MPa；致裂后瓦斯抽采效果大幅度提高，可为低透气性煤层瓦斯高效抽采提供技术指导。
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| 关 键 词： | 2相变致裂' target='_blank'>CO2相变致裂 透气效果 最优结构 瓦斯高效抽采 |
Study on improving gas drainage of coal seam by CO2 cracking technology |
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| Xu Kailin1,Zhou Bo2. Study on improving gas drainage of coal seam by CO2 cracking technology[J]. Zhongzhou Coal, 2018, 0(6): 9-12. DOI: 10.19389/j.cnki.1003-0506.2018.06.002 |
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| Authors: | Xu Kailin1 Zhou Bo2 |
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| Affiliation: | （1.Guizhou Zhiyuan Mining Development Co.，Ltd.，Guiyang 553523，China； 2.Wantian Coal Mine，Guizhou Wantian Coal Group Co.，Ltd.，Guiyang 553523，China） |
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| Abstract: | In view of the current gas control difficulties，low pumping efficiency，and existing enhanced pumping technology there are potential dangers，poor pumping efficiency and other issues，by using the methods of mechanism analysis，numerical simulation and industrial test，the composition and basic principle of liquid CO2 phase splitting technology were discussed；at the same time，the related technical parameters were simulated and optimized by using FLUENT software.The results showed that CO2 fracturing uses high pressure gas to break the coal and rock mass.thus increasing the permeability of coal and rock；the simulation results showed that，the c structure with the shape of straight cylinder is the optimal structure of the releasing hole，and the optimal diameter and pressure are 25 mm and 276 MPa respectively.The effect of gas extraction after fracturing has been greatly improved，which provides efficient technical guidance for high efficiency gas extraction from low permeability coal seams. |
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| Keywords: | 2 phase transformation cracking' target='_blank'>CO2 phase transformation cracking ventilation effect optimum structure high efficiency gas extraction |
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