Fundamental study of flash fracturing in high temperatures controlled by depressure rate

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

Abstract

Artificial cracks creation in rocks can be applied to deep geothermal drilling. Thermal stress derived from rapid decompression is considered to be effective for crack creation of rocks. In this study, rapid decompression experiments on supercritical and subcritical conditions for granite samples were conducted. Temperature drop after decompression (ΔT) is increased as temperature before decompression increases. Porosity results of supercritical decompression specimens show that rock fracturing is largely depending on decompression temperature (large ΔT). Porosity results of specimens at low temperature and high pressure condition indicates at least 100-110 °C drop after decompression is required for cracks creation.

Original languageEnglish
Title of host publicationGeothermal Energy
Subtitle of host publicationPower To Do More - Geothermal Resources Council 2017 Annual Meeting, GRC 2017
PublisherGeothermal Resources Council
Pages956-961
Number of pages6
ISBN (Electronic)0934412227
Publication statusPublished - 2017
EventGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017 - Salt Lake City, United States
Duration: 2017 Oct 12017 Oct 4

Publication series

NameTransactions - Geothermal Resources Council
Volume41
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017
CountryUnited States
CitySalt Lake City
Period17/10/117/10/4

Keywords

  • Geothermal
  • Granite
  • Porosity
  • Rapid decompression
  • Supercritical
  • Thermal stress

ASJC Scopus subject areas

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

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