Thermal-Hydraulic-Mechanical (THM) Coupling Behaviour of Fractured Rock Masses

Zhao, Yanlin; Zhang, Lianyang; Wang, Yixian; Lin, Hang

doi:10.1155/2023/9764934

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Considering that there are more I-II composite faults [35][36][37][38] in rock engineering, and I-II composite faults only crack on the fracture cross-section [39], this study conducted theoretical analysis on the fracture cross-section. This study considered the influence of non-singular terms on the fracture of medium cracks and represented the stress field at the crack tip using the stress intensity factors K I , K II, and T stress, as shown below [40]:…”

Section: The Gmts Criterionmentioning

confidence: 99%

Study on Composite Fracture Characteristics and Hydraulic Fracturing Behavior of Hard Rock

Tang,

Wan,

et al. 2024

Applied Sciences

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To investigate the influence of non-singular terms (T stress) in the stress field on the composite fractures of hard rock Type I–II, such as rock splitting failure and hydraulic fracture propagation, this study focused on hard rocks in metallic mines. Through splitting tests and hydraulic fracturing experiments, the impact of T stress on the characteristics of Type I–II composite fractures in hard rocks was analyzed. Utilizing the generalized maximum tangential (GMTS) stress criterion considering T stress, the stress intensity factors of hard rock Type I–II composite fractures with different pre-existing crack angles were predicted. The critical fracture pressure expression for hard rocks was derived based on the maximum tangential stress (MTS) criterion. The results indicate that the GMTS criterion, considering T stress, is more suitable for describing the characteristics of Type I–II composite fractures under rock-splitting loads. However, under hydraulic fracturing, T stress has a minor influence on the fracture characteristics of hard rock hydraulic fractures. Therefore, when predicting the critical fracture pressure of hydraulic fractures, T stress can be disregarded. This study provides a scientific basis and guidance for hard rock hydraulic fracturing engineering.

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Section: The Gmts Criterionmentioning

confidence: 99%

Study on Composite Fracture Characteristics and Hydraulic Fracturing Behavior of Hard Rock

Tang,

Wan,

et al. 2024

Applied Sciences

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Gas–water percolation of tight sandstone reservoirs with different pore types in the Ordos Basin

He,

Liu,

Shao

et al. 2024

J Petrol Explor Prod Technol

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To investigate the percolation mechanism of tight sandstone reservoirs, qualitative and quantitative methods are applied to analyze the pore structure of the Ordos Basin through scanning electron microscopy and high-pressure mercury injection. Based on gas–water relative permeability data and the visualization of real sandstone models, a gas–water displacement experiment was carried out to simulate the percolation mechanism and fluid distribution of different pore types. The results show that: ① The percolation of different pore types varies greatly, and the irreducible water saturation decreases when the reservoir properties improve. The relative permeability of gas at an irreducible water saturation increases, the width of the two-phase percolation area increases, and the percolation ability is enhanced as the reservoir properties improve. ② The gas–water displacement mode changes from fingering to uniform displacement with the improvement of pore type, which is beneficial to the formation of effective reservoirs filled with natural gas under the same hydrocarbon generation conditions. ③ The time required for the pressure relief of samples with good reservoir properties is short, and the recovery is higher with the improvement of pore type. ④ The residual water in samples with a poor pore type increases, which decreases the relative permeability of gas and recovery. A reasonable development pattern should be carried out, and the production pressure difference should be strictly controlled to maximize productivity. This study provides theoretical guidance for the development of tight sandstone reservoirs in the Ordos Basin.

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Thermal-Hydraulic-Mechanical (THM) Coupling Behaviour of Fractured Rock Masses

Cited by 2 publications

References 15 publications

Study on Composite Fracture Characteristics and Hydraulic Fracturing Behavior of Hard Rock

Study on Composite Fracture Characteristics and Hydraulic Fracturing Behavior of Hard Rock

Gas–water percolation of tight sandstone reservoirs with different pore types in the Ordos Basin

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