Geomechanics and Geodynamics of Rock Masses

Selen, Lena; Panthi, Krishna Kanta; Vergara, Maximilliano R.

doi:10.1201/9780429462078

Cited by 12 publications

(5 citation statements)

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“…Meanwhile, these positive values mean that the GaOCl monolayer expands (contracts) laterally under compressive (tensile) strains. According to the theory reported by Litvinenko et al , 54 the lower values (<0.5) of Poisson's ratio indicate the good compressibility of the GaOCl monolayer.…”

Section: Resultsmentioning

confidence: 78%

Monolayer GaOCl: a novel wide-bandgap 2D material with hole-doping-induced ferromagnetism and multidirectional piezoelectricity

2022

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Section: Resultsmentioning

confidence: 78%

Monolayer GaOCl: a novel wide-bandgap 2D material with hole-doping-induced ferromagnetism and multidirectional piezoelectricity

2022

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“…Thermal energy at these depths is most often stored in granitic or tight sandstone formations that have low or very low permeability and require enhancement to assure flow in the formation. Depending on whether original fluids in place are present or not, the encountered geothermal system may be defined either as hydrothermal or petrothermal [5]. If the testing phase confirms that HDR structure is in place, the prediction models forecast that thermal energy is accessible and extractable with profit, then the Enhanced Geothermal System is developed.…”

Section: Petrothermal Egs Characteristicsmentioning

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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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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“…At the same time, in practice, the realization of the given concept is connected with the necessity of the decision on known problems of deep underground mining [7,8]. This is associated not only with geomechanical issues [9][10][11], but also with the inconsistency of the comining system components, which in turn does not allow for reducing the carbon footprint of the mined georesources [12]. The reduction of emissions of climate-active gases in the process of mining is possible only with the reliable operation of a network of surface cogeneration units [13,14] and the formation of smart "coal-energy-information" systems [15].…”

Section: Introductionmentioning

confidence: 99%

Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors

et al. 2023

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Decarbonization of the mining industry on the basis of closing the energy generation, on the basis of cogeneration of coal mine methane, and on the internal consumption of the mine is a promising direction in ensuring sustainable development. Known problems of deep underground mining do not allow for realizing the potential of man-made gas reservoirs due to the deterioration of the conditions of development of reserves of georesources. The aim of the work was to improve recommendations for the substantiation of drilling parameters for undermined drainage boreholes for increasing methane production from unconventional coal-gas collectors. The authors’ approach innovation lies in the possibility of using the established patterns of better natural stability of undermined boreholes to optimize them as spatial orientation parameters in an existing drilling passport for the improvement of methane extraction productivity. For this purpose, smoothing (LOESS) of the experimental data of two similar types of wells was used; then deterministic interpolation methods in combination with a three-dimensional representation of the response function in “gnuplot” were used. As a result, it was found that the increase in the inclination angle from 40° to 60° leads to a significant transformation of the model of the studied process, accompanied by a decline in the dynamics of methane emission and a decrease in the distance of the productive work zone of this type of well from 13 to 5 m before the roof landing, which then is replaced by a sharp increase in the productive work zone up to 35 m ahead of the longwall face. This allows under specific conditions for recommending increasing the productivity of methane capex from technogenic disturbed coal-gas reservoir replacement of wells with a smaller angle of rise to the transition to a more frequent grid of clusters from wells #4.

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Geomechanics and Geodynamics of Rock Masses

Cited by 12 publications

References 0 publications

Monolayer GaOCl: a novel wide-bandgap 2D material with hole-doping-induced ferromagnetism and multidirectional piezoelectricity

Monolayer GaOCl: a novel wide-bandgap 2D material with hole-doping-induced ferromagnetism and multidirectional piezoelectricity

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

Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors

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