基于RSM-BBD方法的关闭/废弃矿井地热系统长期采热性能研究  

Study on Long-Term Heat Recovery Performance of Geothermal System in Closed/Abandoned Mines Based on RSM-BBD Method

作　　者：魏勇 吉坤 阎鸣泽 李晅辉 刘迎 李宏[3] 韩斌[4] 戴靠山 WEI Yong;JI Kun;YAN Mingze;LI Xuanhui;LIU Ying;LI Hong;HAN Bin;DAI Kaoshan(Jilin Banmiaozi Mining Co.,Ltd.,Baishan,Jilin 134300,China;Key Laboratory of Deep Earth Science and Engineering,Ministry of Education,SichuanUniversity,Chengdu,Sichuan 610065,China;School of Civil Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]吉林板庙子矿业有限公司,吉林白山市134300 [2]四川大学深地科学与工程教育部重点实验室,四川成都610065 [3]大连理工大学土木工程学院,辽宁大连市116024 [4]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2024年第12期273-282,共10页Mining Research and Development

基　　金：深地科学与工程教育部重点实验室(四川大学)开放基金项目(DESEYU202303);国家自然科学基金项目(52374115);国家重点研发计划项目(2018YFC1900603)。

摘　　要：关闭/废弃矿井蕴含着丰富的潜在资源,通过创新性地开发其深部地热,可有效降低对当地经济和环境的影响。为了研究关闭/废弃矿井地热系统的运行及结构参数对其长期采热性能的影响,建立了采空区非均质热储温度-渗流多场耦合模型,并结合RSM-BBD(Response Surface Method-Box-Behnken Design)方法开展数值试验,研究了长期采热过程中储层的温度演化规律,分析了注入温度、注采压差、注采井长等单因素及各因素之间的交互作用对长期采热性能的影响规律。研究结果表明:冷锋首先在注入井附近形成,并随着生产时间的增加,不断向采热井附近拓展;热储内孔隙率的非均匀分布会造成热储下部的冷锋更早的到达采热井;各影响因素与出口温度、采热总量之间的响应面模型的R~2均大于0.9,P值均小于0.0001,可实现对采热系统长期性能的精准预测。因素敏感性分析结果表明,对采热总量影响最大的因素为注采井长,对出口温度影响最大的因素为注入温度。通过对关闭/废弃矿山地热开发的初步探索研究,以期为该类矿山的合理利用和环境友好型能源的发展提供借鉴。The closed/abandoned mine contains rich potential resources, and the impact on the local economy and environment can be effectively reduced by innovatively developing its deep geothermal energy. In order to study the influence of the operation and structural parameters of the closed/abandoned mine geothermal system on its long-term heat recovery performance, the temperature-seepage multi-field coupling model of heterogeneous thermal reservoir in goaf was established, and the numerical experiment was carried out by combining RSM-BBD method. The temperature evolution law of reservoir during long-term heat recovery was studied, and the influence of single factors such as injection temperature, injection-production pressure difference, injection-production well length and the interaction between various factors on long-term heat recovery performance was analyzed. The results show that the cold front is first formed near the injection well, and with the increase of production time, it continues to expand near the heat recovery well. The non-uniform distribution of porosity in the thermal reservoir cause the cold front in the lower part of the thermal reservoir to reach the heat extraction well earlier. The R^(2) of the response surface model between each influencing factor and outlet temperature, total amount of heat extraction is greater than 0.9, and the P is less than 0.000 1, which can accurately predict the long-term performance of the heat extraction system. The results of factor sensitivity analysis show that the most influential factor on the total amount of heat recovery is injection-production well length, and the most influential factor on the outlet temperature is injection temperature. Through the preliminary exploration and research on the geothermal development of closed/abandoned mines, it is expected to provide reference for the rational utilization of such mines and the development of environmentally friendly energy.

关 键 词：关闭/废弃矿井 地热开采 响应面法 采热性能 采热总量 出口温度 

分 类 号：TD98[矿业工程—选矿]