Evolution characteristic and mechanism of microstructure, hydraulic and mechanical behaviors of sandstone treated by acid-rock reaction: Application of in-situ leaching of uranium deposits

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 643, P. 131948 - 131948

Published: Sept. 1, 2024

Language: Английский

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Explosive fracturing mechanism in low-permeability sandstone-type uranium deposits considering different acidification reactions

Energy, Journal Year: 2024, Volume and Issue: 312, P. 133676 - 133676

Published: Nov. 1, 2024

Language: Английский

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A comprehensive review of deep borehole heat exchangers (DBHEs): subsurface modelling studies and applications

Geothermal Energy, Journal Year: 2024, Volume and Issue: 12(1)

Published: June 10, 2024

Language: Английский

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Mechanism and Influencing Factor Analysis of Near-Well Stimulation for Hot Dry Rock Reservoirs by Liquid CO₂ Phase Transition Blasting: Applied to Matouying Uplift

ACS Omega, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

To improve the heat transfer efficiency of hot dry rock (HDR) well group, a near-well stimulation method liquid CO2 phase transition blasting (LCO2-PB) is put forward, fracturing characteristics and mechanism samples induced by impact dynamic load are analyzed, effects hydraulic cracks, buried depth, shock wave amplitude, frequency on reservoir clarified, feasible suggestions have been proposed for its on-site application. Results show that applied LCO2-PB can effectively increase number connectivity cracks enhance complexity damaged cracks. The existence has promoting effect generation distribution because stress reflect refract in torn apart surrounding area. depth suppressive range increases difficulty crack initiation. amplitude beneficial while it also risk wellbore damage. There linear positive correlation between zone area, there an optimal to form connected network avoid serious damage wellbore. For HDR reservoirs with large prefracturing, increasing selecting appropriate significantly promote exploitation resources.

Language: Английский

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Evolution of pore structure, fracture morphology and permeability during CO2+O2 in-situ leaching process of fractured sandstone

Energy, Journal Year: 2024, Volume and Issue: unknown, P. 134348 - 134348

Published: Dec. 1, 2024

Language: Английский

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Experimental and Numerical Simulation Research on Controllable Shock Wave-Induced Shale Fracturing under Repeated Action

ACS Omega, Journal Year: 2024, Volume and Issue: unknown

Published: March 7, 2024

Low permeability is a key geological factor constraining the development of shale gas, and reservoir modification to improve its prerequisite. Controlled shock wave fracturing can induce formation complex fractures in reservoirs expected become an important means modification. However, mechanism controlled engineering control factors are unclear. Therefore, this article reveals effect through small-scale experiments large-scale numerical simulations. Results show that as impact number increases, significant increase large fracture connectivity within samples observed, while correlation between geometric parameters impacts weak. High-energy input model will cause larger range damage rock, accompanied by smaller attenuation index, indicating speed energy plays decisive role rock damage. The influence crustal stress greater than attenuation, higher inhibit fractures. A moderate controllable waves beneficial for effect; however, further increasing loading weaken strengthening effect.

Language: Английский

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An advanced closed-loop geothermal system to substantially enhance heat production

Energy Conversion and Management, Journal Year: 2024, Volume and Issue: 322, P. 119168 - 119168

Published: Oct. 24, 2024

Language: Английский

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Coaxial Pipes Used as Ground Buried Heat Exchangers—A Review of Research in Recent Years

Buildings, Journal Year: 2025, Volume and Issue: 15(2), P. 243 - 243

Published: Jan. 15, 2025

The efficient utilization of geothermal energy depends heavily on high-performance ground heat exchangers. Coaxial pipe is a high-efficiency exchanger composed two nested tubes different diameters. In this paper, the structure and thermal exchange characteristics coaxial exchangers are introduced, which superior to single-U double-U in respect installation, transporting, deep application. Thermal test research investigated. Relevant studies recent years factors affecting performance exchangers, including configurations, circulating fluids, subsurface conditions, flow patterns, operational modes, reviewed. addition, impact ground, as well applications for summarized. Recommendations made potential future It believed that results these will help raise awareness continue promote their

Language: Английский

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Enhanced Heat Extraction for Coaxial Medium-Deep Borehole Heat Exchangers by Adding Triangular Fins on the Outer Tube Wall

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122448 - 122448

Published: Jan. 1, 2025

Language: Английский

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Numerical simulation of the heat extraction effects of N₂O, H₂O, and CO₂ as working fluids in the geothermal model on voronoi fractures

Engineering Research Express, Journal Year: 2025, Volume and Issue: 7(1), P. 015128 - 015128

Published: March 10, 2025

Abstract As fractures serve as the primary heat exchange channels between medium and rock, accurately describing random geometric characteristics of is crucial for studying extraction performance Enhanced Geothermal Systems (EGS). In this study, based on a Voronoi-discrete fracture network, two-dimensional coupled THM (Thermal-Hydraulic-Mechanical) numerical model was developed to explore effects development degree, circulating media, injection/production parameters system’s performance. The results indicate that: ① degree in reservoir increases extends exploitation lifetime. ② has greatest impact system. After 30 years production, N 2 O CO have similar thermal conductivity viscosity, with production temperature approximately 557.51 K, while H only 484.01 K. ③ injection rate secondary Excessively high rates cause short-circuiting wells, significantly reducing temperature. ④. pressure little effect performance, but increasing can reduce pressure. contrast, internal driving force. conclusion suggests that well-developed network enhances Choosing an 60–80 kg s −1 appropriately satisfy both requirements long-term goals.

Language: Английский

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