Conductive heat flow and thermally induced fluid flow around a well bore in a poroelastic medium

Wang, Yarlong; Papamichos, E.

doi:10.1029/94wr01774

Cited by 116 publications

(38 citation statements)

References 10 publications

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“…Analysis involves studying the interactions among changes of pore pressure ( p), temperature ( T ), effective stress σ i j and geochemistry ( C) during drilling shale formations, a typical coupled thermalhydraulic-mechanics-chemical (THMC) process in geomechanics (Dusseault 2003b). Analytical and numerical analyses of wellbore stability issues have focused more and more on coupling mechanisms (Abousleiman et al 1997;Choi et al 2003;Dusseault 1994Dusseault , 1999Dusseault , 2003aDusseault et al 2001;Fam et al 2003;Frydman and da Fontoura 2001;Ghassemi and Diek 2003;Heidug and Wong 1996;Lomba et al 2000;Rothenburg and Bruno 1997;Tan and Rahman 1994;van Oort et al 1996;Wang and Papamichos 1994;Wang and Dusseault 2003;Yu et al 2001;Yuan et al 1995;Wang et al 2007Wang et al , 2008. Most of these studies focused on extremely low permeability shale in which thermal and solute convection are not included.…”

Section: Introductionmentioning

confidence: 99%

Fully Coupled THMC Modeling of Wellbore Stability with Thermal and Solute Convection Considered

et al. 2010

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Wellbore stability analysis is an important topic in petroleum geomechanics. Analytical and numerical analysis of wellbore stability involves the study of interactions among pressure, temperature and chemical changes, and the mechanical response of the rock, a coupled thermal-hydraulic-mechanical-chemical (THMC) process. Thermal and solute convection have usually been overlooked in numerical models. This is appropriate for shales with extremely low permeability, but for shales with intermediate and high permeability (e.g., shale with a disseminated microfissure network), thermal and solute convection should be considered. The challenge of considering advection lies in the numerical oscillation encountered when implementing the traditional Galerkin finite element approach for transient advection-diffusion problems. In this article, we present a fully coupled THMC model to analyze the stress, pressure, temperature, and solute concentration changes around a wellbore. In order to overcome spurious spatial temperature oscillations in the convection-dominated thermal advection-diffusion problem, we place the transient problem into an advectiondiffusion-reaction problem framework, which is then efficiently addressed by a stabilized finite element approach, the subgrid scale/gradient subgrid scale method (SGS/GSGS).

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Section: Introductionmentioning

confidence: 99%

Fully Coupled THMC Modeling of Wellbore Stability with Thermal and Solute Convection Considered

et al. 2010

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“…To handle both couplings, they have to be unified to form the theory of thermo-poroelasticity. Analytical solutions exist for a few special cases [105][106][107][108]. For complex problems, however, numerical tools have to be used.…”

Section: Geomechanicsmentioning

confidence: 99%

Induced seismicity in geothermal reservoirs: A review of forecasting approaches

Gaucher

Schoenball

Heidbach

et al. 2015

Renewable and Sustainable Energy Reviews

159

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In order to reach Europe's 2020 and 2050 targets in terms of greenhouse gas emissions, geothermal resources will have to contribute substantially to meeting carbon-free energy needs. However, public opinion may prevent future large-scale application of deep geothermal power plants, because induced seismicity is often perceived as an unsolicited and uncontrollable side effect of geothermal development. In the last decade, significant advances were made in the development of models to forecast induced seismicity, which are either based on catalogues of induced seismicity, on the underlying physical processes, or on a hybrid philosophy. In this paper, we provide a comprehensive overview of the existing approaches applied to geothermal contexts. This overview will outline the advantages and drawbacks of the different approaches, identify the gaps in our understanding, and describe the needs for geothermal observations. Most of the forecasting approaches focus on the stimulation phase of enhanced geothermal systems which are most prone to generate seismic events. Besides the statistical models suited for realtime applications during reservoir stimulation, the physics-based models have the advantage of considering subsurface characteristics and estimating the impact of fluid circulation on the reservoir. Hence, to mitigate induced seismicity during major hydraulic stimulations, application of hybrid methods in a decision support system seems the best available solution. So far, however, little attention has been paid to geochemical effects on the failure process and to production periods. Quantitative modelling of induced seismicity still is a challenging and complex matter. Appropriate resources remain to be invested for the scientific community to continue its research and development efforts to successfully forecast induced seismicity in geothermal fields. This is a prerequisite for making this renewable energy resource sustainable and accessible worldwide.

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“…Fluid diffusion into or out of rock formations is considered in the above poroelastic analyses. Wang and Papamichos [1994] showed that thermally induced pore pressure changes can be significant inside a low-permeability formation. An increase of 30% over the isothermal pore pressure case can be obtained for certain specified changes of temperature.…”

Section: Introductionmentioning

confidence: 99%