Well Stimulation and Engineered Geothermal Systems

Grant, Malcolm A.; Bixley, Paul F.

doi:10.1016/b978-0-12-383880-3.10014-9

Cited by 5 publications

(11 citation statements)

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“…The flow resistance is determined mainly by the injection/production rate and, because of that, the rate should be possibly minimized. Temperature drawdown, however, is more complex to determine and control as it depends on various parameters, such as fracture distribution and conductivity but, in general, should be minimized as well [29]. The main indicator of the system's efficiency in this analysis is the temperature decline curve; therefore, all results are presented in a form of T pro vs. Time charts and temperature SRV profile for selected cases [2].…”

Section: Resultsmentioning

confidence: 99%

“…One of the main objectives of this research was to analyse how the performance of the proposed system is affected by principal operational parameters; therefore, sensitivity to parameters such as injection rate, fluid injection temperature and production pressure has been checked. The goal was to check the influence of the fracture network's permeability on the thermal efficiency and lifespan of the reservoir [29]. For the first set of simulations, the SRV permeability has been increased, so that the model allows for checking the impact of higher flow rates on the performance.…”

Section: Reservoir Model Properties and Simulated Cases 241 Reservoir...mentioning

confidence: 99%

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Utilization of Discrete Fracture Network (DFN) in Modelling and Simulation of a Horizontal Well-Doublet Enhanced Geothermal System (EGS) with Sensitivity Analysis of Key Production Parameters

2022

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Projects that feature unconventional geothermal systems are complex and come at great investment risk and high project cost. The purpose of this work is to present a method for modelling an enhanced geothermal system (EGS) that utilizes a horizontal well-doublet setup. The proposed wells’ positioning was to minimize one of the biggest cost factors: the flow rate. As a part of the research, a case study was conducted and a fully coupled EGS model prepared, based on the data from the Utah FORGE site. The model includes a discrete fracture network (DFN) that represents hydraulic fractures and a stimulated reservoir volume (SRV) for controlling the fractures’ properties. The model’s viability was checked by a series of reservoir simulations, which provided the results for sensitivity analysis of the production parameters. Analysis of the results was conducted based on the temperature decline over an EGS system lifetime, which is one of the primary indicators for EGS. The proposed solution allowed for effectively minimising the injection and production flow rate while maintaining reasonable temperature drawdown levels. It was proven that reservoir modelling and simulation tools, used in the oil and gas industry, can be successfully applied for modelling geothermal systems.

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Section: Resultsmentioning

confidence: 99%

Section: Reservoir Model Properties and Simulated Cases 241 Reservoir...mentioning

confidence: 99%

Utilization of Discrete Fracture Network (DFN) in Modelling and Simulation of a Horizontal Well-Doublet Enhanced Geothermal System (EGS) with Sensitivity Analysis of Key Production Parameters

2022

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“…Injectivity at the injection well is a key parameter for geothermal reservoirs. In geothermal systems, changes in temperature and the resulting thermal stresses may increase well injectivity through fracturing (Eggertsson et al., 2020; Grant et al., 2013; Huenges et al., 2013; Jansen & Miller, 2017; Siratovich et al., 2011), but may also negatively impact well stability (Bérard & Cornet, 2003). Our results suggest that temperature changes due to injection and production may result in crack opening, ultimately reducing the strength and stiffness of the host rock.…”

Section: Discussionmentioning

confidence: 99%

Thermal Stressing of Volcanic Rock: Microcracking and Crack Closure Monitored Through Acoustic Emission, Ultrasonic Velocity, and Thermal Expansion

Griffiths,

Heap,

Lengliné

et al. 2024

JGR Solid Earth

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Microcracking due to thermal stresses affects the mechanical and flow properties of rocks, which is significant for thermally dynamic environments such as volcanoes and geothermal reservoirs. Compared with other crustal rocks like granite, volcanic rocks have a complex and variable response to temperature; it remains unclear how thermal microcracks form and how they are affected by temperature. We heated and cooled samples of low‐porosity basalts containing different amounts of microcracks and a porous andesite over three cycles, whilst monitoring microstructural changes by acoustic emission (AE) monitoring and measurement of P‐wave velocity (vP; up to 450°C) and thermal expansion coefficient (TEC; up to 700°C). During the second and third cycles, the TEC was positive throughout and the rate of detected AE was low. In contrast to studies on granite, we measured a strong and reversible increase in vP with increasing temperature (by 15%–40% at 450°C), which we interpret as due to microcrack closure. During the first cycle, AE and vP measurements indicated thermal microcracking within the andesite and the basalt with a low initial microcrack density. For these samples, strong inflexions in the TEC indicated stress relaxation during heating, preceding significant thermal microcracking during cooling. The basalt with a high initial microcrack density underwent little microcracking throughout all cycles. Our results and a review of the literature relate the initial microstructure to the occurrence of thermal microcracking and explore the potentially significant influence of temperature on volcanic rock properties.

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“…Dumas and Angelino, 2013), several other studies highlight the usefulness of chemicals for various stimulation techniques, even in the case of EGS (e.g. Grant and Bixley, 2011;Chabora et al, 2012;Breede et al, 2013 ;Clark et al, 2013). However, in present practice large-scale hydraulic stimulation operations are only complemented with additives for specific purposes because they are very expensive.…”

Section: Chemical Matrix Thermal and Hydraulic Stimulationmentioning

confidence: 99%

Energy from the earth - Deep geothermal as a resource for the future?

Hirschberg¹,

Wiemer²,

Burgherr³

2014

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Geothermal energy offers the prospect of supplying base-load power in a decentralized fashion, while remaining heat can be used in district heating networks or industrial processes. No electric power is currently generated from deep geothermal energy sources within Switzerland that is available to end consumers -despite the large resource potential. Résumé LV Options technologiques fondamentalesLes ressources conventionnelles disponibles sous forme de chaleur souterraine (autrement dit hydrothermales) reposent sur l'interaction de trois facteurs :The project benefited from the support of the Swiss Federal Office of Energy (SFOE). Finally, the study would not have been possible without huge in-kind contributions by its authors and their home organizations.

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Well Stimulation and Engineered Geothermal Systems

Cited by 5 publications

References 0 publications

Utilization of Discrete Fracture Network (DFN) in Modelling and Simulation of a Horizontal Well-Doublet Enhanced Geothermal System (EGS) with Sensitivity Analysis of Key Production Parameters

Utilization of Discrete Fracture Network (DFN) in Modelling and Simulation of a Horizontal Well-Doublet Enhanced Geothermal System (EGS) with Sensitivity Analysis of Key Production Parameters

Thermal Stressing of Volcanic Rock: Microcracking and Crack Closure Monitored Through Acoustic Emission, Ultrasonic Velocity, and Thermal Expansion

Energy from the earth - Deep geothermal as a resource for the future?

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