Case Studies in Thermal Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 105715 - 105715
Published: Dec. 1, 2024
Language: Английский
Applied Thermal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 125714 - 125714
Published: Feb. 1, 2025
Language: Английский
Citations
3
SPE Journal, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 21
Published: March 1, 2025
Summary Hydraulic fracturing technology is key to achieving efficient heat extraction from hot dry rock (HDR). During the process, injection of large volumes cold fluids induces thermal stresses, significantly affecting physical properties rock, as well its deformation and failure mechanisms. In this study, based on principle “thermal expansion contraction,” we simulate alternating load environment induced by high-temperature steam low-temperature liquid nitrogen injection. Our aim enhance internal damage in HDR through cyclic thereby increasing complexity fracture networks. However, research elastoplastic mechanisms under loading remains insufficient. use a high-temperature, high-pressure triaxial compression system combined with permeability porosity measurements, along advanced techniques such ultrasonic velocity monitoring, computed tomography (CT) scanning, nuclear magnetic resonance (NMR) imaging, systematically investigate behavior deep reservoir rocks loading. By comparing these results those single treatment experiments, comprehensively analyze changes permeability, porosity, mechanical parameters The experimental show that temperature differences promote formation numerous thermally cracks HDR, weakening strength stiffness. According Mohr-Coulomb criterion, reduces cohesion while friction angle, which enhances characteristics. patterns, CT scan images, incorporating Hoek-Brown Griffith criteria, reveal nonlinear characteristics Under loading, network becomes more complex, shear-type plastic being predominant. Furthermore, validated testing using NMR techniques. Energy dissipation analysis factor calculations indicate level than twice treatment. conclusion, study provides valuable data theoretical guidance for understanding thermomechanical findings are significant importance field application injection, especially development usage geothermal energy.
Language: Английский
Citations
1
Geoenergy Science and Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 213693 - 213693
Published: Jan. 1, 2025
Language: Английский
Citations
0
Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135058 - 135058
Published: Feb. 1, 2025
Language: Английский
Citations
0
Geothermics, Journal Year: 2025, Volume and Issue: 131, P. 103359 - 103359
Published: April 29, 2025
Language: Английский
Citations
0
Case Studies in Thermal Engineering, Journal Year: 2024, Volume and Issue: 61, P. 105043 - 105043
Published: Aug. 27, 2024
Hot Dry Rock (HDR) geothermal resources are a promising source of renewable energy with significant exploitation potential. HDR is typically exist at depths exceeding 2500 m, which presents challenges in terms high in-situ stress and low permeability the rock. To overcome these reduce risk fracking induced earthquakes, scheme for cycling fluid injection has been proposed. In addition, influence geo-stress on re-closure rock fractures, as well its effect granite permeability, important considerations exploitation. study this, GCTS triaxial testing system modified to simulate hydraulic fracturing process deep hot reservoir, tests were conducted simultaneously. A protocol-cyclic applied fracture specimens under various pressures. The results experiments showed that was significantly improved after fracturing, an increase 1–2 orders magnitude compared before. Cyclic techniques can breakthrough pressure create more complex networks. displayed decreasing trend during retention tended stabilize around 1000 min. maximum decrease 90 %, highlights importance considering impact aging engineering. Additionally, axial radial strains also decreased retention. mechanism change attributed closure newly formed fractures from fracturing. Moreover, smaller pressure, faster stabilized These findings provide theoretical basis offer reference secondary time intervals practical engineering applications.
Language: Английский
Citations
2
Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)
Published: July 1, 2024
This study delves into the mechanical properties of various rock types found in glutenite reservoirs Ma'nan area Xinjiang oilfield. It bridges a knowledge gap by exploring deformation and failure patterns among different types. Employing porosity-permeability tests, ultrasonic wave velocity measurements, triaxial compression this research scrutinizes physical parameters, properties, deformation, modes dolomitic sandstone, calcareous coarse fine siltstone, glutenite. Results highlight porosity increase from sandstone to glutenite, with having lowest permeability highest. Shear is greater compared while longitudinal higher than Deformation behavior varies: primarily elastic, show elastoplastic characteristics. Dolomitic boasts highest compressive strength, elastic modulus, Poisson's ratio. Calcareous siltstone's strength modulus fall below ratio three-quarters that sandstone. Main observed are shear axial splitting siltstone. Microscopic analyses, including environmental scanning electron microscopy mineral composition, shed light on differences rocks. In sum, yields crucial insights traits reservoir rocks, essential for optimizing hydraulic fracturing strategies such reservoirs.
Language: Английский
Citations
1
ACS Omega, Journal Year: 2024, Volume and Issue: 9(46), P. 45996 - 46005
Published: Nov. 7, 2024
Hydraulic fracturing is a key technology for the development of tight reservoirs. Affected by factors such as volcanic activity and tectonic movements, rock reservoirs have characteristics diverse lithofacies, complex mineral compositions, well-developed natural fractures. The effectiveness reservoir stimulation largely depends on its ability to connect with fractures form fracture network. In this study, in order clarify propagation behavior reservoirs, experiment was performed specimens prepared from outcrops Emeishan based true triaxial simulation system. influences fracture, fluid viscosity, type were mainly analyzed through post-fracturing specimen splitting, pressure curve analysis, acoustic emission test results. experimental results show that strong heterogeneity, are developed, multiple can be connected after morphology dominated main secondary vertical horizontal has certain control over height. shows different failure modes; under high stress difference, mode matrix shear-dilation mode. shear slip Lower-viscosity slickwater more likely leak fractures, increasing likelihood formation use supercritical carbon dioxide increase complexity, network due physical properties allow it efficiently penetrate microfractures reservoir. Based experiment, paper simulates field parameters analyzes research provide theoretical basis optimizing construction
Language: Английский
Citations
1
Geoenergy Science and Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 213600 - 213600
Published: Dec. 1, 2024
Language: Английский
Citations
1
Petroleum Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 16
Published: Sept. 26, 2024
Language: Английский
Citations
0