注二氧化碳促抽煤层瓦斯数值模拟及现场试验  

Numerical Simulation and Field Test of CO2 Injection to Promote Coal Seam Gas Extraction

作　　者：贾进章[1,2] 张天阔 王东明 雷云[3] JIA Jinzhang;ZHANG Tiankuo;WANG Dongming;LEI Yun(College of Safety Science and Engineering,Liaoning Technical University,Fuxin123000,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Huludao 125105,China;CCTEG Shenyang Research Institute,Shenyang110016,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105 [3]中煤科工集团沈阳研究院有限公司,辽宁沈阳110016

出　　处：《安全与环境工程》2023年第1期78-86,共9页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(52174183)。

摘　　要：为有效减少煤层瓦斯含量,降低煤层瓦斯压力,对注二氧化碳促抽煤层瓦斯技术进行数值模拟及现场试验研究。首先,基于流体力学、煤岩学和吸附力学建立注气抽采数学模型,运用Comsol Multiphysics模拟了经过注气抽采后煤层瓦斯压力和瓦斯含量的变化规律,并将注气抽采煤层瓦斯的效果与常规抽采进行了对比分析;然后,探究了注气压力与抽采负压对注气抽采的影响规律;最后,在阳泉集团新景矿业3#煤层2401工作面开展了注二氧化碳促抽煤层瓦斯技术的现场试验,验证该技术的有效性。结果表明:注气抽采的煤层瓦斯压力下降幅度比常规抽采增加了6.3%,注气抽采的煤层瓦斯含量下降幅度比常规抽采增加了6.81%,消突周期缩短3 d;注气压力对注气抽采的影响较大,抽采负压对注气抽采的影响甚微;经过30 d注气抽采煤层瓦斯现场试验,煤层瓦斯压力为0.118 MPa,与煤层初始瓦斯压力相比下降了75.42%,煤层瓦斯含量剩余为3.174 m^(3)/t,与煤层初始瓦斯含量相比下降了69.55%,消突周期为5 d,说明注二氧化碳促抽煤层瓦斯技术可以有效提高瓦斯抽采效率,降低煤层瓦斯压力和瓦斯含量。In order to reduce the gas content and pressure of coal seam effectively, this paper conducts numerical simulation and field test research on the technology of injecting carbon dioxide to promote the drainage of coal seam gas.First of all, based on fluid mechanics, coal petrology and adsorption mechanics the paper establishes a mathematical model of gas injection extraction, simulates the change of the gas pressure and gas content through gas injection of coal extraction by using Comsol Multiphysics, and compares gas injection and extraction with conventional extraction.Then the paper explores the influence of the pressure of gas injection and extraction from negative pressure on the law of gas injection extraction.Finally, the paper carries out the field test of promoting gas extraction by injecting carbon dioxide at 2401 working face of No.3 coal seam of Xinjing Mining Company of Yangquan Group to verify the validity of the technology.The results show that the decrease of gas pressure and gas content of coal body by injecting gas extraction is 6.3% and 6.81% higher than that of conventional extraction, and the time of eliminating burst is shortened by 3 d.The injection pressure has great influence on the injection gas extraction, while the negative pressure has little influence on the injection gas extraction.After 30 d gas injection and extraction test, the gas pressure of coal seam is 0.118 MPa, which is 75.42% lower than the initial gas pressure, and the gas content of coal body is 3.174 m~3/t, which is 69.55% lower than the initial gas content, and the time of eliminating burst is 5 d.The technology of injecting carbon dioxide to promote gas extraction can effectively improve gas extraction efficiency and reduce gas pressure and gas content in coal seam.

关 键 词：注气抽采 煤层瓦斯含量 煤层瓦斯压力 注气压力 抽采负压 数值模拟 现场试验 

分 类 号：X936[环境科学与工程—安全科学] TD712.6[矿业工程—矿井通风与安全]