Fine characterization of pore structure of acidified anthracite based on liquid intrusion method and Micro-CT

Article Thermodynamics

Experimental study of effect of slickwater fracturing on coal pore structure and methane adsorption

Jun Li et al.

Summary: Slickwater fracturing has a significant impact on the pore structure of coal seams, resulting in a decrease in pore volume and specific surface area, as well as severe blockage of micropores by residual liquid. The development of a gel breaker suitable for slickwater can improve the flowback effect and reduce reservoir damage.

ENERGY (2022)

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Article Energy & Fuels

Experimental evaluation of ultrasound treatment induced pore structure and gas desorption behavior alterations of coal

Peng Liu et al.

Summary: Effective reservoir stimulation is crucial for enhancing coalbed methane (CBM) recovery, and ultrasound treatment offers a new alternative to traditional hydraulic fracturing. This study investigated the alteration of pore/fracture structure in coal with ultrasound treatment and its impact on gas desorption and diffusion behaviors. Results show that ultrasound treatment significantly increases pore volume and interconnectivity in coal, leading to improved gas transport during gas drainage and CBM production.

FUEL (2022)

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Article Thermodynamics

Experimental investigation of erosion effect on microstructure and oxidation characteristics of long-flame coal

Shengli Guo et al.

Summary: Erosion reduces the aromatic layers and coalification degree of coal, increases pore diameter and active group content. Eroded coals consume more oxygen, produce more CO, and have lower apparent activation energies during the oxidation process. Erosion enhances the spontaneous combustion tendency of coal.

ENERGY (2022)

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Article Energy & Fuels

Experimental investigation of water-gas mixed seepage parameters characteristics in broken coal medium

Ming-kun Pang et al.

Summary: This study analyzes and discusses the parameter changes during water-gas permeation to investigate the mixed permeability characteristics of broken coal medium. The study focuses on the law of two-phase flow state transformation, the law of permeability evolution, and the principle of effective stress action. By designing an independent water-gas mixed permeation test system and measuring the gas and liquid two-phase permeation parameters in real time, the study reveals the asynchronous transition process between liquid and gas phase flow regimes and the competitive relationship between the relative permeability ratio of water and gas phases. The study also highlights the sensitivity of the gas phase relative permeability to the compaction deformation process of the initial pore structure, as well as the decrease in permeability with the increase of effective stress in the compaction deformation stages of the broken coal medium skeleton.

ENERGY REPORTS (2022)

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Article Engineering, Chemical