Analysis of long-term performance of hot dry rock geothermal energy extraction systems based on fractal fracture network model

Kimio Watanabe, Nobutsugu Chigira, Jonathan Willis-Richards, Toshiyuki Hashida, Hideaki Takahashi, Kazuo Hayashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Based on a fractal fracture network model of a Hot Dry Rock geothermal reservoir, a numerical analysis of hydraulic stimulation and heat extraction was carried out. Ogachi field, a demonstration field of Hot Dry Rock geothermal energy extraction system, was chosen for the analysis. The hydraulic stimulation to create a two-layer reservoir was simulated numerically, and it became clear that fracture orientation has significant influence on the direction of the stimulated area, i.e., the reservoir direction. Using the fracture patterns chosen by temperature history matching of a 150 days circulation test, the long-term profile of production temperature at Ogachi was estimated. Although there are some assumption for water flow in the reservoir, the production temperature was estimated to be 150°C after 10 years.

Original languageEnglish
Pages (from-to)223-243
Number of pages21
JournalGeothermal Science and Technology
Volume6
Issue number1-4
Publication statusPublished - 1999 Jan 1

Keywords

  • Fractal fracture network model
  • Hot dry rock
  • Predicted long-term performance
  • Production temperature

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Management of Technology and Innovation

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