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Article
Analysis of Fracture Network Formation Mechanisms and Main Controlling Factors of Methane Explosion Fracturing in Deep Shale Reservoir
Methane in situ explosion fracturing can induce intricate fracture networks by detonating methane desorbed from deep shale reservoirs. Elucidating the fracture propagation mechanisms under high-pressure gas ex...
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Article
Impact of Effective Stress and Surface Roughness on Nonlinear Gas Flow in Shale Fractures
The behavior of gas flow in fractures is crucial for evaluating shale gas production. This study focused on the coupling relationships between effective stress, surface roughness, and gas flow behavior in shal...
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Article
Pore Structure and Damage Evaluation of Hot Dry Rocks in Enhanced Geothermal System by Combining Electrical Resistivity, Ultrasonic Waves and Nuclear Magnetic Resonance
A liquid nitrogen cold-shock fracturing method is proposed to resolve the problem of single heat-exchange cracks generated by hydraulic fracturing in an enhanced geothermal system. A complex crack network can ...
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Article
Microstructure Evolution of Bituminous Coal Modified by High-Pressure CO2 Foam Fracturing Fluid with Different Treatment Times
The microstructure of bituminous coal can be changed significantly due to injection of CO2 foam fracturing fluid into the coal seam, affecting CBM production efficiency. To investigate the microstructural change ...
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Article
Research on the layout optimization and utilization of floor gas extraction roadway: a case study in Shoushan No.1 Coal Mine, China
Gas extraction with the crossing boreholes of the floor rock roadway is an important method to prevent accidents of coal and gas outbursts. The spatial layout of the floor gas extraction roadway has a specific...
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Article
Numerical study on the effect of sudden change in coal property on coal and gas outburst during roadway excavation
Coal and gas outburst (CGO) is a devastating disaster in the coal mining industry at the cost of human life. Considerable efforts have been done to eliminate this hazard, but CGO still occurs frequently. The g...
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Article
Damage and Failure of Hot Dry Rock under Cyclic Liquid Nitrogen Cold Shock Treatment: A Non-destructive Ultrasonic Test Method
Liquid nitrogen is proposed as a new fracturing fluid to develop enhanced geothermal systems based on the thermal stimulation method. The large temperature difference between cryogenic liquid nitrogen and hot ...
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Article
The performance of soundless cracking agents for weakening rock roof under different notch angles
Aiming at the problems with hard rock roof of coal seams, such as their large strength and difficulty in caving, traditional high-pressure water injection, and deep-hole blasting methods for roof weakening are...
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Article
Coal pore characteristics at different freezing temperatures under conditions of freezing–thawing cycles
Most coal reservoirs in China have low permeability, which causes gas drainage to be inefficient. The method of cyclic cryogenic fracturing basing on freezing–thawing (F–T) fracturing effects is proposed to br...
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Article
Experimental study on coal pore structure deterioration under freeze–thaw cycles
This study investigated the impact of consecutive freeze–thaw cycles on the coal pore structure deterioration. Eight coal samples (cores and thin sections) underwent different numbers of freeze–thaw cycles. Th...
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Article
Open AccessFactors controlling the mechanical properties degradation and permeability of coal subjected to liquid nitrogen freeze-thaw
Freeze-thaw induced fracturing coal by liquid nitrogen (LN2) injection exerts a significant positive effect on the fracture permeability enhancement of the coal reservoir. To evaluate the different freeze-thaw va...
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Article
The characteristics and main influencing factors affecting coal and gas outbursts in Chinese **dingshan mining region
The **dingshan mining region in China has witnessed severe coal and gas outbursts. A total of 153 coal and gas outburst accidents have occurred in this mining region. As the mining depth progressively increa...
