Numerical thermo-elastic simulation for change in fracture aperture associated with cold fluid injection

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

Abstract

We analyzed the effect of thermal contraction of rock on fracture permeability. The analysis was carried out by using a 2D FEM code which can treat the coupled problem of fluid flow in fractures, elastic and thermal deformation of rock and heat transfer. We assumed a single fracture in a high-temperature rock mass subjected to a uniform confining stresses. Under the conditions, low-temperature fluid was injected into the fracture. The results of simulation showed that even under confining environment, the considerable increase in fracture permeability appeared due to thermal deformation of rock, which should be caused by the difference between the initial temperature of rock and the fluid temperature. However, for the increase of fracture permeability, the temperature difference was necessary to be larger than a critical value, and the critical value increased with the magnitude of confining stress.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting, GRC 2014 - Geothermal
Subtitle of host publicationA Global Solution
PublisherGeothermal Resources Council
Pages301-304
Number of pages4
ISBN (Electronic)9781634394673
Publication statusPublished - 2014 Jan 1
EventGeothermal Resources Council Annual Meeting - Geothermal: A Global Solution, GRC 2014 - Portland, United States
Duration: 2014 Sep 282014 Oct 1

Publication series

NameTransactions - Geothermal Resources Council
Volume38
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting - Geothermal: A Global Solution, GRC 2014
CountryUnited States
CityPortland
Period14/9/2814/10/1

Keywords

  • Aperture
  • Fracture
  • Geother-mal reservoir
  • Reinjection
  • Thermal contraction

ASJC Scopus subject areas

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

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