High-pressure hydraulic stimulation of geothermal reservoir

Sergei Fomin, Toshiyuki Hashida, Vladimir Chugunov

Research output: Contribution to journalConference article

Abstract

Hydraulic stimulation is performed by high-pressure fluid injection, which permanently increases the permeability of a volume of rock, typically transforming it from the microdarcy into the millidarcy range. 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 non-steady-state hydraulic stimulation is proposed and analyzed. Fluid flow is assumed to be radial, injected flow rate constant; and fluid density, rock porosity, and permeability depend on fluid pressure. The conventional boundary of the growing stimulated rock volume is introduced as a surface where the porosity and permeability of the stimulated rock exhibit a sharp decline and remain constant within the undisturbed area. The problem is solved analytically by a modified method of integral correlations. As a result, approximate close-form solutions for pressure distributions in the stimulated and non-stimulated (undisturbed) areas are obtained, and an equation for the moving boundary of the stimulated volume is derived. The correctness of the approximate solution is validated by comparison to an exact self-similar solution of the problem obtained for the particular case when the well's radius is assumed to be equal to zero.

Original languageEnglish
Article numberIMECE2004-61444
Pages (from-to)687-693
Number of pages7
JournalAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Volume260
DOIs
Publication statusPublished - 2004 Dec 1
Event2004 ASME International Mechanical Engineering Congress and Exposition, IMECE 2004 - Anaheim, CA, United States
Duration: 2004 Nov 132004 Nov 19

Keywords

  • Approximate solution
  • Borehole
  • Fluid pressure
  • Geothermal reservoir
  • Hydraulic stimulation
  • Permeability

ASJC Scopus subject areas

  • Engineering(all)

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