煤层注CO_(2)驱替抽采瓦斯的数值模拟及敏感性分析  

Numerical Simulation and Sensitivity Analysis of CO_(2) Injection Displacement Gas Extraction in Coal Seam

作　　者：李柏 刘鹏 胡彪 龙航 闫冬洁 季鹏飞 LI Bai;LIU Peng;HU Biao;LONG Hang;YAN Dongjie;JI Pengfei(Collage of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Coal Mine Gas Disaster Prevention and Control of Higher Education Institutions in Shaanxi Province,Xi'an,Shaanxi 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西部煤矿瓦斯灾害防控陕西省高等学校重点实验室,陕西西安710054

出　　处：《矿业研究与开发》2024年第12期169-176,共8页Mining Research and Development

基　　金：国家自然科学基金项目(52304255);陕西省教育厅科研计划项目(21JK0776,23JK0546)。

摘　　要：煤层注气驱替抽采是降低煤层瓦斯含量的有效措施,为探究煤层注CO_(2)驱替抽采瓦斯效果的影响因素及其敏感性,采用控制变量法及正交试验法,利用COMSOL Multiphysics数值模拟软件,分析了煤层注CO_(2)驱替抽采瓦斯规律,对注气压力、煤体温度、煤体渗透率及煤体载荷等影响驱替抽采瓦斯效果的因素进行了敏感性分析。结果表明:注气压力与渗透率的提高对驱替起到强化作用,煤体温度与载荷的提高对驱替起到弱化作用;驱替瓦斯量影响因素的敏感性排序为煤体渗透率>注气压力>煤体温度>载荷,煤体渗透率对驱替瓦斯量的影响是注气压力的5.97倍,注气压力是煤体温度的14.97倍,煤体温度是载荷的1.65倍;驱替速度敏感性排序为煤体渗透率>注气压力>载荷>煤体温度,渗透率对驱替速度的影响是注气压力的9.23倍,注气压力是载荷的32.66倍,载荷是煤体温度的3.20倍。实际工程中为达到更好的驱替效果,可以考虑提高煤体渗透性和增加注气压力。Coal seam gas injection displacement extraction is an effective measure to reduce the gas content of coal seam. In order to explore the influence factors and their sensitivity on the effect of CO_(2) injection displacement gas extraction in coal seam, the control variable method and orthogonal test method were used to analyze the law of CO_(2) injection displacement gas extraction in coal seam by using COMSOL Multiphysics numerical simulation software. The sensitivity analysis was carried out on the factors affecting the effect of displacement gas extraction, such as gas injection pressure, coal temperature, coal permeability and coal load. The results show that the increase of gas injection pressure and permeability plays a strengthening role in displacement. The increase of coal temperature and load plays a weakening role in displacement. The sensitivity of the influencing factors of displacement gas volume is ranked as coal permeability>gas injection pressure>coal temperature>load. The effect of coal permeability on displacement gas volume is 5.97 times that of gas injection pressure. The gas injection pressure is 14.97 times that of coal temperature, and coal temperature is 1.65 times that of load. The order of displacement velocity sensitivity is coal permeability>gas injection pressure>load>coal temperature. The effect of permeability on displacement velocity is 9.23 times that of gas injection pressure. The gas injection pressure is 32.66 times that of load, and load is 3.20 times that of coal temperature. In order to achieve better displacement effect in practical engineering, it can be considered to improve coal permeability and increase gas injection pressure.

关 键 词：注气驱替 敏感性分析 驱替量 驱替速度 数值模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]