THERMO-HYDRO-MECHANICAL MODELING OF WORKING FLUID INJECTION AND THERMAL ENERGY EXTRACTION IN EGS FRACTURES AND ROCK MATRIX Metadata

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Title

  • Main Title THERMO-HYDRO-MECHANICAL MODELING OF WORKING FLUID INJECTION AND THERMAL ENERGY EXTRACTION IN EGS FRACTURES AND ROCK MATRIX

Creator

  • Author: Podgorney, Robert
    Creator Type: Personal
  • Author: Lu, Chuan
    Creator Type: Personal
  • Author: Huang, Hai
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of Energy Efficiency and Renewable Energy.
    Contributor Type: Organization
    Contributor Info: DOE - EE

Publisher

  • Name: Idaho National Laboratory
    Place of Publication: Idaho Falls, Idaho
    Additional Info: Idaho National Laboratory (INL)

Date

  • Creation: 2012-01-01

Language

  • English

Description

  • Content Description: Development of enhanced geothermal systems (EGS) will require creation of a reservoir of sufficient volume to enable commercial-scale heat transfer from the reservoir rocks to the working fluid. A key assumption associated with reservoir creation/stimulation is that sufficient rock volumes can be hydraulically fractured via both tensile and shear failure, and more importantly by reactivation of naturally existing fractures (by shearing), to create the reservoir. The advancement of EGS greatly depends on our understanding of the dynamics of the intimately coupled rock-fracture-fluid-heat system and our ability to reliably predict how reservoirs behave under stimulation and production. Reliable performance predictions of EGS reservoirs require accurate and robust modeling for strongly coupled thermal-hydrological-mechanical (THM) processes. Conventionally, these types of problems have been solved using operator-splitting methods, usually by coupling a subsurface flow and heat transport simulators with a solid mechanics simulator via input files. An alternative approach is to solve the system of nonlinear partial differential equations that govern multiphase fluid flow, heat transport, and rock mechanics simultaneously, using a fully coupled, fully implicit solution procedure, in which all solution variables (pressure, enthalpy, and rock displacement fields) are solved simultaneously. This paper describes numerical simulations used to investigate the poro- and thermal- elastic effects of working fluid injection and thermal energy extraction on the properties of the fractures and rock matrix of a hypothetical EGS reservoir, using a novel simulation software FALCON (Podgorney et al., 2011), a finite element based simulator solving fully coupled multiphase fluid flow, heat transport, rock deformation, and fracturing using a global implicit approach. Investigations are also conducted on how these poro- and thermal-elastic effects are related to fracture permeability evolution.

Subject

  • Keyword: Heat Transfer
  • Keyword: Fractures
  • Keyword: Working Fluids Egs
  • Keyword: Volume
  • Keyword: Simulators
  • Keyword: Heat
  • Keyword: Simulation
  • STI Subject Categories: 15 Geothermal Energy
  • Keyword: Modeling
  • Keyword: Injection
  • Keyword: Coupling
  • Keyword: Rocks
  • Keyword: Enthalpy
  • Keyword: Solids
  • Keyword: Fracturing
  • Keyword: Egs
  • Keyword: Partial Differential Equations
  • Keyword: Rock Mechanics
  • Keyword: Solutions
  • Keyword: Permeability
  • Keyword: Transport
  • Keyword: Fluid Flow
  • Keyword: Shear
  • Keyword: Extraction
  • Keyword: Production
  • Keyword: Geothermal
  • Keyword: Stimulation
  • Keyword: Geothermal Systems
  • Keyword: Deformation
  • Keyword: Reservoir Rock
  • Keyword: Performance

Source

  • Conference: Stanford Geothermal Workshop,Stanford,01/29/2012,02/01/2012

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: INL/CON-12-24584
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 1042378
  • Archival Resource Key: ark:/67531/metadc835377