Numerical analysis for unsteady state growth behavior of hydraulically-induced reservoirs

K. Yoshida, S. Fomin, T. Hashida

Research output: Contribution to journalConference articlepeer-review


Hydraulic stimulation is performed by a high-pressure fluid injection, which permanently increases the permeability of a volume of rock. After a period of stimulation, fluid injection and recovery boreholes are introduced into the stimulated rock volume and heat is extracted by water circulation. In the present study a simplified mathematical model of the non-steady hydraulic stimulation is proposed and solved numerically. Fluid flow is assumed to be radial, injection flow rate constant; and rock porosity and permeability depend on fluid pressure. The conventional boundary of the growing stimulated rock volume is introduced as a surface where porosity and permeability of the stimulated rock exhibit a sharp decline and remain constant within undisturbed area. As a result, the pressure distributions in the stimulated and non-stimulated volume areas are obtained and the equation for the moving boundary of the stimulated volume is derived.

Original languageEnglish
Pages (from-to)197-200
Number of pages4
JournalTransactions - Geothermal Resources Council
Publication statusPublished - 2005
EventGeothermal Resources Council 2005 Annual Meeting - Reno, NV, United States
Duration: 2005 Sept 252005 Sept 28


  • Artificial Reservoir
  • EGS
  • Enhanced Geothermal Systems
  • HDR
  • Hot Dry Rock
  • Hydraulic Stimulation
  • Numerical Simulation


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