Thermal stresses around egs

Mahmood Arshad, Masami Nakagawa, Kamran Jahan Bakhsh, Lucila Dunnington

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Developing an Enhanced Geothermal System (EGS), is a complex process and is dependent on range of design parameters, geological and operating variables. Stresses around EGS are believed to be either 'sound and non-harming' or 'violent and catastrophic' among different groups involved, directly or indirectly, in EGS. This paper explains how thermal inflow from country rock to the reservoir rock induces temperature changes in the zone, herein referred to as "impact zone", around the reservoir. The growth behavior of impact zone depends on aforementioned sets of variables and is explained in this paper. Thermal stresses are generated during and after working cycle of the EGS within this impact zone due to thermal changes. This paper also gives an insight in understanding the behavior of stresses distribution around reservoir rock. As the reservoir rock is thermo-elastically connected to the country rock, newly generated stresses interact with the existing in-situ stresses under prevailing conditions of geological, design and operating variables. A simple model has been used for the demonstration of facts stated in this paper. Later on, variables dictating the continuous, safe and efficient working of EGS are also outlined.

Original languageEnglish
Title of host publicationGeothermal Energy Here and Now
Subtitle of host publicationSustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting
PublisherGeothermal Resources Council
Pages293-299
Number of pages7
ISBN (Electronic)0934412219
Publication statusPublished - Jan 1 2016
Externally publishedYes
EventGeothermal Resources Council 2016 Annual Meeting - Geothermal Energy Here and Now: Sustainable, Clean, Flexible, GRC 2016 - Sacramento, United States
Duration: Oct 23 2016Oct 26 2016

Publication series

NameTransactions - Geothermal Resources Council
Volume40
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council 2016 Annual Meeting - Geothermal Energy Here and Now: Sustainable, Clean, Flexible, GRC 2016
CountryUnited States
CitySacramento
Period10/23/1610/26/16

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

Cite this

Arshad, M., Nakagawa, M., Bakhsh, K. J., & Dunnington, L. (2016). Thermal stresses around egs. In Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting (pp. 293-299). (Transactions - Geothermal Resources Council; Vol. 40). Geothermal Resources Council.