Experimental approach for decompression drilling in high temperature geothermal conditions

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

4 Citations (Scopus)

Abstract

We propose a new concept of the engineered geothermal development where reservoirs are created in ductile basement. In order to utilize ductile zone in great depth, it is necessary to develop new drilling technology. Hydrothermal brecciation were formed by explosive failure without any chemical reactions such as dissolution and precipitate, and hydrothermal brecciation could be occurred under high temperature condition involving ductile regimes in nature. Hydrothermal experiments for artificial fracturing was carried out by using visible type autoclave. Explosive failure could be occurred under relatively low pressure and high temperature difference between solid sample and injected fluid. According to hydrothermal experiments, phase transition from liquid to vapor (in other words, 'boiling') produced latent heat of evaporation, which is main reason for creating tensile fracture by thermal stress. Based on field observation and hydrothermal experiments, we could propose conceptual idea of decompression drilling technology for developing ductile rock mass.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2012, GRC 2012 - Geothermal
Subtitle of host publicationReliable, Renewable, Global
Pages561-564
Number of pages4
Publication statusPublished - 2012 Dec 1
EventGeothermal Resources Council Annual Meeting 2012 - Geothermal: Reliable, Renewable, Global, GRC 2012 - Reno, NV, United States
Duration: 2012 Sep 302012 Oct 3

Publication series

NameTransactions - Geothermal Resources Council
Volume36 1
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2012 - Geothermal: Reliable, Renewable, Global, GRC 2012
CountryUnited States
CityReno, NV
Period12/9/3012/10/3

Keywords

  • Drilling technology
  • Ductile zone
  • EGS
  • Fracturing
  • Hydraulic stimulation
  • Supercritical geothermal fluid

ASJC Scopus subject areas

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

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