THM耦合作用对EGS储层水流阻抗的影响分析  

Influence of thermal-hydrologic-mechanical coupling on flow impedance of EGS reservoir

作　　者：王昌龙 王鑫 鲁进利[1] 孙彦红 Wang Changlong;Wang Xin;Lu Jinli;Sun Yanhong(School of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan 243032,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032

出　　处：《可再生能源》2022年第10期1319-1324,共6页Renewable Energy Resources

基　　金：安徽省自然科学基金项目(1808085QE178,2008085QE256)。

摘　　要：文章基于传热-流动-力学(Thermal-Hydrologic-Mechanical,THM)耦合模型对比分析了不同条件下THM耦合和传热-流动耦合的增强型地热系统(Enhanced Geothermal System,EGS)储层水流阻抗,研究了力学过程对储层水流阻抗的影响。结果显示:在考虑力学过程后,储层水流阻抗随时间而增大的幅度减小,因而力学过程倾向于降低储层水流阻抗;储层水流阻抗与储层内平均水力传导系数的变化趋势基本是相反的,然而后者不能完全决定储层水流阻抗;在较高地温梯度、较高注入井筒底部压力及较低注入井筒底部温度条件下,力学过程对储层水流阻抗的影响较大。Based on a thermal-hydrologic-mechanical(THM)coupling model,the flow impedances of enhanced geothermal system(EGS)reservoir with THM coupling and thermal-hydrologic(TH)coupling under different conditions are compared and analyzed,and the influence of mechanical process on the flow impedance of reservoir is studied.The results are as follows:after considering the mechanical process,the increasing rate of the flow impedance with time decreases,so the mechanical process tends to reduce the flow impedance;the change trend of the flow impedance is basically opposite to the average hydraulic conductivity in the reservoir,but the latter can not completely determine the flow impedance;for higher geothermal gradient,higher injection wellbore bottom pressure or lower injection wellbore bottom temperature,the mechanical process has a greater influence on the flow impedance.

关 键 词：EGS THM耦合 力学过程 储层水流阻抗 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程] TK521