增强型地热系统不同注采井网参数分析

doi:10.13278/j.cnki.jjuese.20170309

Abstract

Abstract: According to the process of heat extraction of fracture system in enhanced geothermal system (EGS) dry-hot-rock reservoir, a thermal-hydraulic coupling analytical model was established based on the discrete fracture network model. The Laplace transform was used to obtain the analytical solutions. The influence of the parameters of injection and production of five spot pattern was analyzed for the temperature and heat extraction at outlet. The results show that the temperature drop at outlet and the time of thermal breakthrough are different under different fracture network and well types. Under the same fracture network, the larger the fracture spacing is, the later the thermal breakthrough time is. When the fracture spacing is 50.0, 100.0 and 150.0 m, the thermal breakthrough time is 2.0 a, 5.2 a and 15.0 a, respectively. The smaller the injection rate is, the slower the temperature decreases. When the injection rate is 0.1, 0.2 and 0.3 kg/s, in production of 20.0 a, the temperature decreases by 53.0, 34.5, and 26.8℃, respectively; Orthogonal experimental analysis shows that well spacing has the greatest influence on injection-production parameters with a range of 13.15, followed by injection rate and injection temperature, while well type has smallest influence.

Key words: hot-dry-rock, enhanced geothermal system (EGS), discrete fracture network model, thermal-hydraulic coupled, analytical model

CLC Number:

TK521

Fan Dongyan, Sun Hai, Yao Jun, Li Huafeng, Yan Xia, Zhang Kai, Zhang Lin. Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System[J].Journal of Jilin University(Earth Science Edition), 2019, 49(3): 797-806.

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Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System

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