Numerical study on optimum injection temperature inferred from coupled-hydro-thermal-mechanical behavior of rock

Takatoshi Ito, Daniel Swenson, Kotaro Sekine, Kazuo Hayashi

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

For geothermal energy development, we verify in this paper the existence of an optimum temperature difference for injection, ΔTc. Injectivity of geothermal wells depends on the temperature difference between the rock and injected fluid, ΔT. If fluid injection into a well is carried out with ΔT larger than ΔTc, the injectivity of the well will be high, since the low-temperature flow induces sufficient thermal contraction to open fractures and increase permeability. However, such high injectivity is not expected if ΔT is smaller than ΔTc. We derive an expression for ΔTc based on a simple elastic model, and the formulation is verified through comparison with the results of 2D-FEM simulations and field tests.

Original languageEnglish
Pages (from-to)695-698
Number of pages4
JournalTransactions - Geothermal Resources Council
Volume27
Publication statusPublished - 2003 Dec 1
EventInternational Collaboration for Geothermal Energy in the Americas - Geothermal Resources Counsil: 2003 Annual Meeting - Morelia, Michoacan, Mexico
Duration: 2003 Oct 122003 Oct 15

Keywords

  • Fracture
  • Geothermal well
  • Injectivity
  • Re-injection
  • Thermal stress

ASJC Scopus subject areas

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

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