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Title: Coupled THM Modeling of Hydroshearing Stimulation in Tight Fractured Volcanic Rock

Here, we use the TOUGH-FLAC simulator for coupled thermo–hydro-mechanical modeling of well stimulation for an Enhanced Geothermal System (EGS) project. We also analyze the potential for injection-induced fracturing and reactivation of natural fractures in a porous medium with associated permeability enhancement. Our analysis aims to understand how far the EGS reservoir may grow and how the hydroshearing process relates to system conditions. We analyze the enhanced reservoir, or hydrosheared zone, by studying the extent of the failure zone using an elasto-plastic model, and accounting for permeability changes as a function of the induced stresses. For both fully saturated and unsaturated medium cases, the results demonstrate how EGS reservoir growth depends on the initial fluid phase, and how the reservoir extent changes as a function of two critical parameters: (1) the coefficient of friction, and (2) the permeability-enhancement factor. Furthermore, while well stimulation is driven by pressure exceeding the hydroshearing threshold, the modeling also demonstrates how injection-induced cooling further extends the effects of stimulation.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. AltaRock Energy, Seattle, WA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; EE0002777
Type:
Accepted Manuscript
Journal Name:
Transport in Porous Media
Additional Journal Information:
Journal Volume: 108; Journal Issue: 1; Journal ID: ISSN 0169-3913
Publisher:
Springer
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; hydroshearing; thermo-hydro-mechanical coupling; enhanced geothermal system; EGS stimulation
OSTI Identifier:
1407348

Rinaldi, A. P., Rutqvist, J., Sonnenthal, E. L., and Cladouhos, T. T.. Coupled THM Modeling of Hydroshearing Stimulation in Tight Fractured Volcanic Rock. United States: N. p., Web. doi:10.1007/s11242-014-0296-5.
Rinaldi, A. P., Rutqvist, J., Sonnenthal, E. L., & Cladouhos, T. T.. Coupled THM Modeling of Hydroshearing Stimulation in Tight Fractured Volcanic Rock. United States. doi:10.1007/s11242-014-0296-5.
Rinaldi, A. P., Rutqvist, J., Sonnenthal, E. L., and Cladouhos, T. T.. 2014. "Coupled THM Modeling of Hydroshearing Stimulation in Tight Fractured Volcanic Rock". United States. doi:10.1007/s11242-014-0296-5. https://www.osti.gov/servlets/purl/1407348.
@article{osti_1407348,
title = {Coupled THM Modeling of Hydroshearing Stimulation in Tight Fractured Volcanic Rock},
author = {Rinaldi, A. P. and Rutqvist, J. and Sonnenthal, E. L. and Cladouhos, T. T.},
abstractNote = {Here, we use the TOUGH-FLAC simulator for coupled thermo–hydro-mechanical modeling of well stimulation for an Enhanced Geothermal System (EGS) project. We also analyze the potential for injection-induced fracturing and reactivation of natural fractures in a porous medium with associated permeability enhancement. Our analysis aims to understand how far the EGS reservoir may grow and how the hydroshearing process relates to system conditions. We analyze the enhanced reservoir, or hydrosheared zone, by studying the extent of the failure zone using an elasto-plastic model, and accounting for permeability changes as a function of the induced stresses. For both fully saturated and unsaturated medium cases, the results demonstrate how EGS reservoir growth depends on the initial fluid phase, and how the reservoir extent changes as a function of two critical parameters: (1) the coefficient of friction, and (2) the permeability-enhancement factor. Furthermore, while well stimulation is driven by pressure exceeding the hydroshearing threshold, the modeling also demonstrates how injection-induced cooling further extends the effects of stimulation.},
doi = {10.1007/s11242-014-0296-5},
journal = {Transport in Porous Media},
number = 1,
volume = 108,
place = {United States},
year = {2014},
month = {3}
}