Numerical Investigation of Vertical Hydraulic Fracture Propagation and Fracturing Parameter Optimization in Deep Coalbed Methane Reservoirs

Processes, Journal Year: 2025, Volume and Issue: 13(3), P. 909 - 909

Published: March 19, 2025

Deep coalbed methane (CBM) reservoirs hold substantial resource potential and play a crucial role in China’s unconventional natural gas development. However, the vertical propagation behavior of hydraulic fractures deep CBM formations remains inadequately understood, posing challenges for optimizing fracturing parameters to control fracture height growth enhance development within coal seam. To address this, this study establishes numerical simulation models investigate directional wells, incorporating three typical lithological combinations representative reservoirs. Through these models, influence mechanisms bedding density, stress ratio, rock friction coefficient, on post-fracture productivity were systematically analyzed. The results reveal that characteristics vary significantly with combinations. Initially, penetrated adjacent near wellbore while simultaneously generating branched fractures, leading formation complex network. As continues, branch exhibited reduced width compared primary fracture. Well-developed planes roof or floor, combined lower ratios coefficients, effectively constrained growth. Furthermore, fluid volume, reducing injection rate, lowering proppant concentration promoted seam, thereby enhancing well productivity. These findings provide theoretical foundation optimization strategies reservoirs, contributing more effective reservoir stimulation recovery.

Language: Английский

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Correlation between acoustic emission characteristics and shear behavior of rock fracture

Engineering Analysis with Boundary Elements, Journal Year: 2025, Volume and Issue: 176, P. 106234 - 106234

Published: March 29, 2025

Language: Английский

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Mechanical and Failure Properties of Deep Grouted Fractured Rock Under Real-Time Coupling of Temperature and Dynamic Load

Processes, Journal Year: 2025, Volume and Issue: 13(4), P. 1249 - 1249

Published: April 21, 2025

Deep grouting rock engineering is faced with the dual influence of high temperature and dynamic load, which has become a hot issue in geotechnical engineering. This study analyzes mechanical responses failure properties deep-grouted fractured under real-time coupling loads through high-temperature-split Hopkinson pressure bar (HT-SHPB), high-speed imaging, scanning electron microscopy (SEM) tests. Key findings reveal that (1) compressive strength grouted exhibits significant dependency, where increases increase temperature, been verified by relevant references. From indoor to 100 °C, moderately, while pronounced observed between °C 300 °C. (2) In contrast, peak strain demonstrates two-stage evolution, sharply rises from followed slowly rise (3) Macroscopically, impact fractures preferentially initiate as parallel lines at extremities pre-existing fractures, consistent stress concentration patterns loading. Microscopic analysis reveals materials effectively suppress micro-crack generation propagation attributed thermally enhanced cementation pore-filling effects, explaining variation macroscopic microscopic point view.

Language: Английский

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Macro-Meso Failure Mechanisms and Slip Characteristics of Jointed Sandstone Under Uniaxial Compression

Results in Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 105238 - 105238

Published: May 1, 2025

Language: Английский

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