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The effect of leakage characteristics of liquid CO2 phase transition on fracturing coal seam: Applications for enhancing coalbed methane recovery.
- Source :
-
Fuel . Jan2022, Vol. 308, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • Release pressure and diameter determined the distribution range of smash district. • Filling level of LCO 2 directly control the distribution range of crack district. • LCO 2 filling parameters can be used to guide LCO 2 -PB field applications. Liquid carbon dioxide phase-transition blasting (LCO 2 -PB) is a promising alternative method for enhanced coalbed methane (ECBM) extraction and prevention of coal and gas outbursts. During the process of the LCO 2 -PB fracturing the coal seam, the improper application of fracturing model will reduce the efficiency of gas drainage and cause gas disasters. To clearly understand the ECBM modes of LCO 2 -PB fracturing coal seam process, this paper employed experiments to investigate the effect of leakage characteristics of the LCO 2 -PB on fracture models of coal cubes, including release pressure (P r), filling level (V), release diameter (D r) and blasting hole diameter (D b). We propose the combination I and II of the LCO 2 -PB leakage parameters and applied two methods to the in-situ tests. The results revealed that the gas flow of the boreholes of the LCO 2 -PB with the combination I is 0.368 m3/min, which is 2.07 times that of the combination II (0.178) in the soft coal seam. Besides, the average methane flow of the boreholes with combination II is 0.796 m3/min, which is 1.78 times the combination I (0.448) in the hard coal seam. The adjustment of leakage parameters of the LCO 2 -PB technology can be helpful for ECBM and reduce the risk of coal and gas outbursts in the soft and hard coal bed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 308
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 153238585
- Full Text :
- https://doi.org/10.1016/j.fuel.2021.122044