Available geothermal energy extractable by conventional techniques is in dry and comparatively impermeable rocks. Enhanced Geothermal System (EGS) technologies enhance geothermal resources in the hot dry rock (HDR) through fracture operations, usually through hydro-shearing. Large scale deployment of geothermal power production requires the demonstration of successful EGS projects extracting heat from reservoirs constituting a variety of geological conditions. In this part, numerical models are very important to show how geothermal power plant operations can be less risky and safer. Owing the fact that, some major challenges in these operations are interaction between shear and tensile fractures with natural faults. These interactions can be seen in two different cases, either these faults are badly oriented or these faults are fill in pore fluids or gases which are mainly high pressure. Fluids and gases are important on account for because of the fact that these pore fluids can over whelmed the injection pressure and cause well blow out. Furthermore, to prevent these operational hazards, we use field data and analysis in combination with experimental tests and numerical/analytical models with finite element method software such as COMSOL Multiphysics. Further work will be required for improving enhanced geothermal production by optimizing hydro-shearing practices.
Investigating the Role of Temperature on Thermal Stress and Fracture Propagation in Geothermal Systems
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Bazargan, Mohsen, Broumand, Pooyan, Gudmundsson, Agust, Meredith, Philip, Bazargan, Mohsen, Rezaee, Ali, and Soliman Mohammed. "Investigating the Role of Temperature on Thermal Stress and Fracture Propagation in Geothermal Systems." Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California, USA, June 2017.
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