Sustainable heat farming: Modeling extraction and recovery in discretely fractured geothermal reservoirs

Fox, Don B.; Sutter, Daniel; Beckers, Koenraad F.; Lukawski, Maciej Z.; Koch, Donald L.; Anderson, B. J.; Tester, Jefferson W.

doi:10.1016/j.geothermics.2012.09.001

Cited by 88 publications

(44 citation statements)

References 12 publications

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“…This concept has been adopted by other authors for estimating the heat extraction from hot-dry-rock systems which are commonly referred to as enhanced or engineered geothermal systems today (e.g., [36][37][38]). The planar-fracture-method assumes fluid flow through a simple rectangular gap between two homogeneous, isotropic, impermeable blocks of hot rock.…”

Section: Resource Assessment Methodsmentioning

confidence: 99%

Assessment and Public Reporting of Geothermal Resources in Germany: Review and Outlook

2018

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Any geothermal resource assessment requires consistent and widely accepted terminology, methods, and reporting schemes that facilitate the comparison of geothermal resource estimates. This paper reviews common resource assessment methods, as well as reporting codes and terminology. Based on a rigorous analysis of the portrayed concepts and methods, it discusses the appropriateness of the existing reporting codes for sustainable utilization of geothermal resources in Germany. Since the last quantitative geothermal resource assessment in Germany was done 15 years ago, a revised report is overdue. Unlike fossil energy commodities, geothermal energy replenishes naturally and heat recuperation increases in created heat sinks. This replenishment process offers the opportunity for sustainable reservoir management in the case of moderate production rates or cyclic operation. Existing reporting codes, however, regard geothermal resources in a similar way to fossil resources or focus too much on field development rather than on the whole assessment process. In order to emphasize the renewability of geothermal energy, we propose the reporting of geothermal capacities (per doublet or per km 2 ) instead of recoverable heat energy which depends very much on project lifetime and other factors. As a first step, a new classification scheme for geothermal resources and reserves is outlined.

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Section: Resource Assessment Methodsmentioning

confidence: 99%

Assessment and Public Reporting of Geothermal Resources in Germany: Review and Outlook

2018

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“…This system is commonly used to characterize an idealized EGS reservoir [2,20,21], although the geometrical configuration of the model does not fully portray a realistic EGS reservoir.…”

Section: Conceptual Modelmentioning

confidence: 99%

On Heat and Mass Transfer within Thermally Shocked Region of Enhanced Geothermal System

et al. 2017

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An Enhanced Geothermal System (EGS) is an artificially created geothermal reservoir formed by hydrofracturing hot dry rock. Thermal shock occurs when the cold water contacts the hot rock near the injection borehole, creating a network of small, disorganized, closely spaced micro cracks. As the cold-water injection continues, the hot rock cools down and the micro cracks coalesce, becoming a better-defined network of thermal fractures. Thermal fractures in an EGS reservoir are believed to improve reservoir performance by increasing the surface area for heat exchange and lowering flow impedance; however, it is difficult to precisely predict how they grow and affect the permeability of the reservoir. The goal of this paper is to provide an insight into the transport mechanisms within the thin, permeable, thermally shocked region of an EGS reservoir. COMSOL Multiphysics5 is used to set up an indealized porous region with identical geometrical features at different domain scales to show the scale dependence of heat and mass transport in the initial microscale crack network and in the later coalesced thermal fractures. This research shows the importance of EGS maturity in determining how heat and mass are transferred and how to select appropriate analytical tools for different stages of development.

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“…Equivalent continuous porous media method (the fracture system is seen as an equivalent continuous media, with similar methodologies as for double porosity and double permeability). In Fox et al [12] an analytical and numerical model for fractured reservoirs (multi-fractured EGS) is presented and simulated. In the following Figure 3 an example of simplified scheme of fluid circulation into the fractures is shown (b being the fracture size and x s the fractures mutual spacing).…”

Section: Mathematical and Physical Backgroundmentioning

confidence: 99%

“…This resulted in a normalised first order consistent version of the SPH method with improved accuracy. The attempts to ensure first order consistency in SPH led to the development of a number of variants of the SPH method, such as Element Free GalerkinMehod (EFGM) [113] [114], Reproducing Kernel Particle Method (RKPM) [56] [57], Moving Least Square Particle Hydrodynamics (MLSPH) [12], Meshless Local PetrovGalerkin Method (MLPG) [115]. These methods allow the restoration of consistency of any order by means of a correction function.…”

Section: Introductionmentioning

confidence: 99%

Brief Review of Numerical Simulation Applied to Solve Oil Extraction Problems

Onofre-Ramos¹,

Castañeda²,

Austria-Aguilar³

et al. 2015

IJG

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In the last decades, the numerical analysis has abridged the time and cost of oil extractive operations, and thus their implementation has been promoted so much that today is used to solve a large number of phenomena that occur during the extraction of hydrocarbons, not only economizing the operation, but also shedding light to the phenomenon, and helping to have a better understanding. Nevertheless in spite of the success of the applications of numerical simulations, it has been until today, looking for their optimization, because the discretization methods of the domain and the model are through meshes, which require modifying the physics of the problem so that this matches the numerical method, and not in backwards.

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Sustainable heat farming: Modeling extraction and recovery in discretely fractured geothermal reservoirs

Cited by 88 publications

References 12 publications

Assessment and Public Reporting of Geothermal Resources in Germany: Review and Outlook

Assessment and Public Reporting of Geothermal Resources in Germany: Review and Outlook

On Heat and Mass Transfer within Thermally Shocked Region of Enhanced Geothermal System

Brief Review of Numerical Simulation Applied to Solve Oil Extraction Problems

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