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Investigating the role of temperature on thermal stress and fracture propagation in geothermal systems

Bazargan, M; Broumand, P; Gudmundsson, A; Meredith, P; Rezaee, A; Mohammed, S; (2018) Investigating the role of temperature on thermal stress and fracture propagation in geothermal systems. In: 51st US Rock Mechanics / Geomechanics Symposium 2017 Proceedings of a meeting held 25-28 June 2017, San Francisco, California, USA. (pp. pp. 2063-2074). American Rock Mechanics Association: San Francisco, CA, USA. Green open access

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Abstract

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.

Type: Proceedings paper
Title: Investigating the role of temperature on thermal stress and fracture propagation in geothermal systems
Event: 51st US Rock Mechanics / Geomechanics Symposium 2017
ISBN-13: 9781510857582
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.proceedings.com/38459.html
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10087514
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