TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive Geochemical Transport in Variably Saturated Geologic Media, V1.2.1

Xu, Tianfu; Sonnenthal, Eric; Spycher, Nicolas; Pruess, Karsten

doi:10.2172/943451

Cited by 197 publications

(366 citation statements)

References 84 publications

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“…To meet the specific needs for this project, the existing simulator TMVOC (Pruess and Battistelli, 2002) was coupled with the chemical reaction module of TOUGHREACT (Xu et al, 2006) to yield a new simulator referred to as TMVOC_REACT. New features in TMVOC_REACT relative to TMVOC include:…”

Section: List Of Acronyms and Abbreviationsmentioning

confidence: 99%

“…For example, TMVOC (Pruess and Battistelli, 2002) is a numerical simulator for three-phase nonisothermal flow of water, noncondensible gases, and a multicomponent mixture of volatile organic chemicals (VOCs) in saturatedunsaturated media. Thus, TMVOC can handle transport of organics and gas mixtures, but lacks the necessary reactive-transport modeling capabilities offered by TOUGHREACT (Xu et al, 2006). TOUGHREACT, in turn, does not provide for handling of arbitrary gas mixtures and/or organic solvents.…”

Section: Approachmentioning

confidence: 99%

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Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Zheng¹,

Spycher²,

Xu³

et al. 2010

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Section: List Of Acronyms and Abbreviationsmentioning

confidence: 99%

Section: Approachmentioning

confidence: 99%

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Zheng¹,

Spycher²,

Xu³

et al. 2010

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“…TOUGHREACT has been developed as a comprehensive nonisothermal multi-component reactive fluid flow and geochemical transport simulator to investigate these and other problems (Xu et al, 2008). A number of subsurface thermophysical-chemical processes are considered under various thermohydrological and geochemical conditions of pressure, temperature, water saturation, and ionic strength.…”

Section: Toughreact Codementioning

confidence: 99%

“…These equations are presented in Xu et al (2008). Expressions for nonisothermal multiphase flow are given in Pruess (1987) and Pruess et al (1999).…”

Section: Governing Equationsmentioning

confidence: 99%

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Disposal systems evaluations and tool development : Engineered Barrier System (EBS) evaluation.

Rutqvist¹,

Liu²,

Steefel³

et al. 2011

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Eric Sonnenthal (LBNL) Engineered Barrier System (EBS) Evaluation This page is intentionally left blank Engineered Barrier System (EBS) Evaluation 5 Executive SummaryKey components of the nuclear fuel cycle are short-term storage and long-term disposal of nuclear waste. The latter encompasses the immobilization of used nuclear fuel (UNF) and radioactive waste streams generated by various phases of the nuclear fuel cycle, and the safe and permanent disposition of these waste forms in geological repository environments. The engineered barrier system (EBS) plays a very important role in the long-term isolation of nuclear waste in geological repository environments. EBS concepts and their interactions with the natural barrier are inherently important to the long-term performance assessment of the safety case where nuclear waste disposition needs to be evaluated for time periods of up to one million years. Making the safety case needed in the decision-making process for the recommendation and the eventual embracement of a disposal system concept requires a multi-faceted integration of knowledge and evidence-gathering to demonstrate the required confidence level in a deep geological disposal site and to evaluate longterm repository performance.The focus of this report is the following:• Evaluation of EBS in long-term disposal systems in deep geologic environments with emphasis on the multi-barrier concept;• Evaluation of key parameters in the characterization of EBS performance;• Identification of key knowledge gaps and uncertainties;• Evaluation of tools and modeling approaches for EBS processes and performance.The above topics will be evaluated through the analysis of the following:• Overview of EBS concepts for various NW disposal systems;• Natural and man-made analogs, room chemistry, hydrochemistry of deep subsurface environments, and EBS material stability in near-field environments;• Reactive Transport and Coupled Thermal-Hydrological-Mechanical-Chemical (THMC) processes in EBS;• Thermal analysis toolkit, metallic barrier degradation mode survey, and development of a Disposal Systems Evaluation Framework (DSEF).This report will focus on the multi-barrier concept of EBS and variants of this type which in essence is the most adopted concept by various repository programs. Empasis is given mainly to the evaluation of EBS materials and processes through the analysis of published studies in the scientific literature of past and existing repository research programs. Tool evaluations are also emphasized, particularly on THCM processes and chemical equilibria. Although being an increasingly important aspect of NW disposition, short-term or interim storage of NW will be briefly discussed but not to the extent of the EBS issues relevant to disposal systems in deep geologic environments. Interim storage will be discussed in the report Evaluation of Storage Concepts FY10 Final Report (Weiner et al. 2010). Engineered Barrier System (EBS) Evaluation 6This page is intentionally left blank Engineered Barrier System (EBS) Eva...

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Thermal drawdown and late‐stage seismic‐slip fault reactivation in enhanced geothermal reservoirs

Gan

Elsworth

2014

JGR Solid Earth

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Late-stage seismic slip in geothermal reservoirs has been shown as a potential mechanism for inducing seismic events of magnitudes to~2.6 as late as two decades into production. We investigate the propagation of fluid pressures and thermal stresses in a prototypical geothermal reservoir containing a centrally located critically stressed fault from a doublet injector and withdrawal well to define the likelihood, timing, and magnitude of events triggered by both fluid pressures and thermal stresses. We define two bounding modes of fluid production from the reservoir. For injection at a given temperature, these bounding modes relate to either low-or high-relative flow rates. At low relative dimensionless flow rates the pressure pulse travels slowly, the pressure-driven changes in effective stress are muted, but thermal drawdown propagates through the reservoir as a distinct front. This results in the lowest likelihood of pressure-triggered events but the largest likelihood of late-stage thermally triggered events. Conversely, at high relative non-dimensional flow rates the propagating pressure pulse is larger and migrates more quickly through the reservoir but the thermal drawdown is uniform across the reservoir and without the presence of a distinct thermal front, and less capable of triggering late-stage seismicity. We evaluate the uniformity of thermal drawdown as a function of a dimensionless flow rate Q D that scales with fracture spacing s (m), injection rate q (kg/s), and the distance between the injector and the target point. This parameter enables the reservoir characteristics to be connected with the thermal drawdown response around the fault and from that the corresponding magnitude and timing of seismicity to be determined. These results illustrate that the dimensionless temperature gradient adjacent to the fault dT D /dx D is exclusively controlled by the factor Q D . More significantly, this temperature gradient correlates directly with both the likelihood and severity of triggered events, enabling the direct scaling of likely magnitudes and timing to be determined a priori and directly related to the characteristics of the reservoir. This dimensionless scaling facilitates design for an optimum Q D value to yield both significant heat recovery and longevity of geothermal reservoirs while minimizing associated induced seismicity.

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TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive Geochemical Transport in Variably Saturated Geologic Media, V1.2.1

Cited by 197 publications

References 84 publications

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Disposal systems evaluations and tool development : Engineered Barrier System (EBS) evaluation.

Thermal drawdown and late‐stage seismic‐slip fault reactivation in enhanced geothermal reservoirs

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