Journal
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
Volume 6, Issue 1, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40948-019-00123-2
Keywords
Analytical model; Multi-link fractures; Heat transfer; Enhanced geothermal system; Parametric analysis
Funding
- National Natural Science Foundation of China [41874216]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Program of Introducing Talents of Discipline to Chinese Universities (111 Plan) [D18016]
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Enhanced geothermal system (EGS) is the system for extracting the geothermal heat through the hydraulic fractured reservoir with the circulated fluid. Effective simulating method of the heat extract process is crucial to evaluate the efficiency of the EGS. In order to study the heat extraction process in the complex morphological fractures, the fluid flowing and heat transfer models through the analytical method in multi-link fracture are proposed. The Laplace transform method is applied to simplify the heat transfer equations for both fracture fluid and formation rock. The coordinates transformation is used to study the heat extraction performance in the EGS. The proposed analytical model is compared with the numerical model, which is verified to be efficient. The heat extraction performance of three multi-link fracture cases are simulated. The Case 2 with the longest fracture length has the highest production temperature. The parametric analysis shows that the longer flowing distance is helpful for producing higher fluid temperature and gaining more geothermal heat. The lower velocity and lower fracture width facilitate to obtain higher production temperature. While higher velocity and higher fracture width can extract more geothermal energy. From the above analysis, the multi-link fracture model with analytical method can be applied in EGS simulation.
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