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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 break coal to increase its permeability. An F–T experiment was carried out at different freezing temperatures using a nuclear magnetic resonance (NMR) test and an ultrasonic test. We investigated...
Liquid CO2 (LCO2) enhanced coalbed methane recovery had been studied in laboratory experiments and field applications, supporting many improvements and achievements. Previous studies primarily investigated the gas bursting, flooding effect and adsorption effect; however, the freezing-thawing phenomenon (drikold formation and gasification) that commonly occurs during the LCO2 injection process was...
Liquid carbon dioxide (LCO2) fracturing technology has been applied in the enhanced coalbed methane recovery (ECBM), and it has made some progress in the physical experiments and field applications. However, the freeze phenomenon during the injection process might induce coal matrix shrinkage, hindering the fracturing efficiency. A multiple cycle LCO2 fracturing technology is proposed, and the feasibility...
Liquid nitrogen (LN2), a non-aqueous medium, has attracted attention in recent years as a fluid for fracturing in the petroleum/energy industry. This study proposes a freeze-thaw method using LN2 to improve coal permeability for the production of coal bed methane. Experiments were conducted using nuclear magnetic resonance (NMR) to explore the physical properties of frozen-thawed coal. The coal samples...
To maximize the extraction efficiency and quantity of coalbed methane, we improved reservoir permeability by fracturing coalbed methane reservoirs using ultrasonic wave excitation. Changes in number and diameter of pores in coal masses were determined by using nuclear magnetic resonance analysis of coal masses that had been fractured using ultrasonic waves. The development of coal fractures was monitored...
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