Shanxi Sanyuan Coal Industry Co.
China Coal Science and Engineering Group Shenyang Research Institute Co.
State Key Laboratory of Coal Mine Safety Technology

针对低渗透高瓦斯煤层，为了提高瓦斯抽采效率，利用模拟软件分析了液态CO2致裂器间距对致裂效果的影响，并进行了现场试验。结果表明：煤岩致裂效果与致裂器的布置间距成正相关，最佳致裂器布置间距为3 m；瓦斯流量自然衰减系数气爆后由0.038 6 d-1降低至0.009 12 d-1，瓦斯流量衰减降幅达到76.37%，证明气爆对煤层瓦斯抽采的持续时间有延长作用。

Aiming at low permeability and high gas coal seams, in order to improve gas extraction efficiency, simulation software is used to analyze the influence of liquid CO2 fracturing device spacing on the fracturing effect, and on-site experiments are conducted. The results show that the effect of coal rock fracturing is positively correlated with the spacing of the fracturing device arrangement, and the optimal arrangement spacing of the fracturing device is 3 m; The natural gas flow attenuation coefficient decreased from 0.038 6 d-1 to 0.009 12 d-1 after gas explosion, and the gas flow attenuation decreased by 76.37%, indicating that gas explosion can prolong the duration of coal seam gas extraction.

1 液态CO2相变致裂模拟分析
1.1 模型构建
1.2 致裂器间距的影响分析
2 液态CO2相变气爆致裂技术工业试验
2.1 钻孔参数设计
2.2 钻孔自然瓦斯涌出特征
3 结论

崔瑞清,高宏烨.煤层液态CO_2增渗技术研究[J].山东煤炭科技,2023,41(07):132-135.