Application of the computer code TOUGH2 to the simulation of supercritical conditions in geothermal systems

Croucher, Adrian; O’Sullivan, Michael

doi:10.1016/j.geothermics.2008.03.005

Cited by 44 publications

(22 citation statements)

References 14 publications

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“…Alternatively, transient-localized decompression produced by water boiling and degassing near active fractures can bring the fluids near-spinodal conditions (Thiéry and Mercury 2009) and induce explosive vaporization. Published simulations of geothermal or volcanic systems (e.g., Yano and Ishido 1998;Hurwitz et al 2003;Reid 2004;Croucher and O'Sullivan 2008;Pashkevich and Taskin 2010) show that these mechanisms are plausible for the case of Piton de la Fournaise. The studies generally stress the necessity to have a medium with a high permeability between the heat source and the fluids' plume to enhance the efficiency of the system.…”

Section: Possible Role Of the Hydrothermal System In Eruption Triggeringmentioning

confidence: 99%

The interplay between collapse structures, hydrothermal systems, and magma intrusions: the case of the central area of Piton de la Fournaise volcano

2011

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International audienceWe explore the possible relationships between a structural heterogeneity, the hydrothermal system, and the intrusive activity at Piton de la Fournaise volcano. Geological and geophysical data show that as the result of repeated collapses (the last one in 2007), a cylinder of faulted, fractured, and crumbled rocks must exist between the surface and the top of a magma reservoir at about sea level. This structure constitutes a major geological heterogeneity. An obvious spatial correlation exists between this column of fractured and brecciated rock and the location of (1) most of the seismic activity, (2) a low-resistivity dome, (3) a huge self-potential anomaly, (4) thermal evidence of hydrothermal activity, and (5) the root of magma intrusions. The dominant factors that make this structural heterogeneity a trap for the activity are probably its higher permeability and its weaker mechanical strength. Evidence exists for the presence of an active hydrothermal system confined in this permeable zone. The long-term stability of the activated zone above sea level and the similarity of the pre-eruptive crises, in spite of the inferred large perturbation of the magmatic system in 1998, suggest a common triggering mechanism for all the eruptions since at least the first data recorded by the observatory in 1980. This mechanism can be purely magmatic, resulting from the pressurization of a reservoir, but we also propose that the hydrothermal system may play a role in the development of volcanic instabilities. A qualitative model is proposed to explain the triggering of magma intrusions by hydrothermal processes, and its speculative aspects are discussed. This work represents a first attempt to integrate the structural and dynamic information in a unified framework at Piton de la Fournaise

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Section: Possible Role Of the Hydrothermal System In Eruption Triggeringmentioning

confidence: 99%

The interplay between collapse structures, hydrothermal systems, and magma intrusions: the case of the central area of Piton de la Fournaise volcano

2011

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“…Croucher and O'Sullivan (2008) updated the thermodynamic formulation used in TOUGH2 from IFC-67 to the more recent IAPWS-97 formulation to allow this code to handle supercritical conditions. O' Sullivan et al (2015Sullivan et al ( , 2016 have made further refinements to the AUTOUGH2 code.…”

Section: Conceptual Models and Numerical Simulation Studiesmentioning

confidence: 99%

“…O' Sullivan et al (2015Sullivan et al ( , 2016 have made further refinements to the AUTOUGH2 code. Magnusdottir and Finsterle (2015) developed a new equation-of-state module (EOS1sc), following the approach of Croucher and O'Sullivan (2008) to extend the applicability of iTOUGH2 to temperatures and pressures above 800 °C and 100 MPa while obtaining better accuracy and higher computational speeds. Gunnarsson and Aradóttir (2014) have developed a simple conceptual model that invokes shallow dike intrusions as the heat source for volcanic-hosted geothermal systems.…”

Section: Conceptual Models and Numerical Simulation Studiesmentioning

confidence: 99%

Utilizing supercritical geothermal systems: a review of past ventures and ongoing research activities

Reinsch

Dobson

Asanuma³

et al. 2017

Geotherm Energy

158

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“…Compared to the version included in TOUGH2V.2.0 , the EWASG version, jointed to T2Well, implements several major improvements (Battistelli et al, 2012), namely: -IAPWS-IF97 correlations for pure water and steam (IAPWS, 1997;Croucher and O'Sullivan, 2008) and a more recent formulation for water and steam viscosity (IAPWS, 2008).…”

Section: Ewasg Eos Modulementioning

confidence: 99%

Interpretation of production tests in geothermal wells with T2Well-EWASG

et al. 2018

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Highlights• T2Well-EWASG, a coupled wellbore-reservoir numerical simulator for geothermal systems.• Interpretation of geothermal well-tests.• Application of T2Well-EWASG on a short well-test performed on a well of the Wotten Waven geothermal field (Dominica). AbstractIn the geothermal sector, being able to simulate production tests by combining surface and downhole measurements can be extremely useful, improving data interpretation and reducing the impact of unavailable field data. This is possible with T2Well, a coupled wellbore-reservoir simulator. We plugged the EWASG equation of state for high enthalpy geothermal reservoirs into T2Well and extended the function to analytically compute the heat exchange between wellbore and formation at the short times. Changes to the analytical heat exchange function were verified by comparison with wellbore-formation heat exchange numerically simulated. T2Well-EWASG was validated by reproducing the flowing pressure and temperature logs taken from literature, and by using the software for the interpretation of a short production test. Simulation results indicate that T2Well-EWASG can be effectively used to improve the interpretation of production tests performed in geothermal wells.

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Application of the computer code TOUGH2 to the simulation of supercritical conditions in geothermal systems

Cited by 44 publications

References 14 publications

The interplay between collapse structures, hydrothermal systems, and magma intrusions: the case of the central area of Piton de la Fournaise volcano

The interplay between collapse structures, hydrothermal systems, and magma intrusions: the case of the central area of Piton de la Fournaise volcano

Utilizing supercritical geothermal systems: a review of past ventures and ongoing research activities

Interpretation of production tests in geothermal wells with T2Well-EWASG

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