中深层同轴套管式地热井作为一种高效的地热能利用方式，目前受到中国许多地区的大力推广。为了研究其取热性能及其影响因素，采用COMSOL Multiphysics进行建模，并进行正交实验分析。结果表明：各因素对地热井取热功率影响程度的大小依次为：地温梯度、入口流量、回填材料导热系数、入口温度、内管导热系数；在设计地热井时需综合多因素考虑，以确定最佳运行工况；地热井径向温度影响范围约为10 m，对于同一区域多井布置有一定参考。

Medium-depth coaxial geothermal wells, as an efficient way to utilize geothermal energy, are now being vigorously promoted by many regions in China. In order to study its heat extraction performance and its influencing factors, COMSOL Multiphysics was used for modeling and orthogonal experimental analysis. The results show that the effects of all influencing factor on the heat extraction from geothermal wells are listed in the following order: ground temperature gradient, inlet flow rate, thermal conductivity of the backfill material, inlet temperature, and thermal conductivity of the inner tube. When designing geothermal wells, it is necessary to consider multiple factors to determine the optimal operating conditions. The radial temperature influence range of geothermal wells is about 10 m, which is a reference for the arrangement of multiple wells in the same area.