Volume 27: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part II

Numerical Simulation of Fractured Enhanced Geothermal System Based on Projection-Based Embedded Discrete Fracture Model Xiuwei Liu,Shiqing Cheng,Dengke Shi,Dingning Cai,Fuguo Yin,Dawei Liu

Abstract

Enhanced Geothermal System (EGS) is now the main method to extract heat from the hot dry rock, and the fractures are the key to achieving a high heat extraction. This paper extends the related transmissibility calculation method of non-neighboring connections (NNC) in the projection-based embedded discrete fracture model (pEDFM) to the calculation of effective thermal transmissibility. In this way, a thermal pEDFM is proposed to evaluate the heat extraction performance of the fractured EGS. The model verification is conducted by comparing the result of the thermal pEDFM and the analytical solution. At last, two simulation examples are utilized to illustrate the flexibility and the practicality of the thermal pEDFM, which reveals that the thermal pEDFM can be applied in the evaluation of the heat extraction analysis for the fractured EGS.

Keywords Enhanced Geothermal System,Thermal pEDFM,Model verification,Two simulation examples