A fractal model for gas-water relative permeability in inorganic shale considering water occurrence state

Yang, Rui; Ma, Tianran; Kang, Yulong; Du, Hongzhou; Xie, Shuli; Ma, Depeng

doi:10.1016/j.fuel.2024.133664

Fuel

2025

DOI: 10.1016/j.fuel.2024.133664

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A fractal model for gas-water relative permeability in inorganic shale considering water occurrence state

Rui Yang,

Tianran Ma,

Yulong Kang

et al.

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Cited by 3 publications

References 51 publications

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Spatial distribution of soil pore structure and response characteristics of physical parameters in the subsidence area induced by shallow-buried extra-thick coal seam mining

Li,

Huang,

Wang

et al. 2024

Journal of Cleaner Production

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Spatial distribution of soil pore structure and response characteristics of physical parameters in the subsidence area induced by shallow-buried extra-thick coal seam mining

Li,

Huang,

Wang

et al. 2024

Journal of Cleaner Production

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Experimental investigation on CO2 flooding for enhanced light oil recovery in low-permeability sandstones under multiple controlling factors by online nuclear magnetic resonance testing

Qi,

Liu,

Guo

et al. 2024

Physics of Fluids

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As an efficacious medium for enhancing oil recovery, CO2 has been extensively employed in the domain of petroleum extraction and can effectively improve the oil recovery rate to a certain extent. However, the mechanisms of oil–gas distribution and migration in low-permeability reservoirs remain unclear and require further study. The development of nuclear magnetic resonance (NMR) testing provides a new method for visualizing displacement experiments. This research investigates CO2 displacement and NMR testing on low-permeability cores, simultaneously focusing on multiple controlling factors such as injection pressure, temperature, core permeability, and CO2 phase state. Cores were selected based on NMR assessments of pore-permeability characteristics, followed by four sets of displacement experiments. Results show that injection pressure and core permeability are the primary factors influencing oil recovery. High injection pressure can enhance oil recovery and effective recovery occurs when pressure exceeds the threshold (about 6 MPa for core #3 in this study), with recovery rates above 30%. Low-permeability cores do not form effective displacement channels, while high-permeability cores, especially those with fractures, are prone to CO2 breakthrough, reducing recovery efficiency, such as core #6. During low-pressure recovery, there is a discernible migration of oil from smaller to larger pores before extraction, totally differing from the pattern observed in high-pressure recovery. Additionally, temperature increases were found to improve recovery slightly, but the impact of CO2 phase on recovery remains inconclusive due to the limitation of the equipment and need further discussion.

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Roadway portal and self-moving hydraulic support for rockburst prevention in coal mine and its application

Li,

Chen,

et al. 2024

Physics of Fluids

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As coal mining depths increase, rockbursts pose a significant threat to the safety of coal mine operations. Addressing the challenge of safely and steadily advancing excavation faces amid rockburst hazards, this study assesses the current state of reinforcement support technology for rockburst-prone roadways. It scrutinizes the concept of roadway anti-rockburst hydraulic support, support design, and the integration with the surrounding rock mass. The research delineates key directions for enhancing support systems, including the mechanical mechanisms of anti-rockburst hydraulic support, integrated roadway and support design, the synergistic pressure-equalizing effect of primary supports and bolts(cables), and the development of robotic systems for roadway anti-rockburst hydraulic support reinforcement. We propose an integrated design approach that holistically addresses both primary and reinforcement support in rockburst-prone roadways. To tackle the challenge of handling hydraulic supports in confined spaces, we developed a gantry hydraulic support system capable of self-movement with mechanical arm assistance for anti-rockburst hydraulic support. Field trials demonstrate that this system enables cyclical support advancement and retraction, automating and intelligently managing the underground advanced support sector. This innovation significantly reduces worker numbers and labor intensity, enhancing operational safety and efficiency. Furthermore, the system facilitates permanent support via bolt drilling under hydraulic protection, effectively mitigating the risks associated with unstable temporary roadway support and unsafe working conditions without proper roof coverage, thereby ensuring the secure and efficient operation of mining face.

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A fractal model for gas-water relative permeability in inorganic shale considering water occurrence state

Cited by 3 publications

References 51 publications

Spatial distribution of soil pore structure and response characteristics of physical parameters in the subsidence area induced by shallow-buried extra-thick coal seam mining

Spatial distribution of soil pore structure and response characteristics of physical parameters in the subsidence area induced by shallow-buried extra-thick coal seam mining

Experimental investigation on CO2 flooding for enhanced light oil recovery in low-permeability sandstones under multiple controlling factors by online nuclear magnetic resonance testing

Roadway portal and self-moving hydraulic support for rockburst prevention in coal mine and its application

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