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A Case Study on the Fracturing Radius and Time Effects of CO 2 Phase Transition Fracturing in Coal Seams.
- Source :
- Sustainability (2071-1050); Apr2022, Vol. 14 Issue 7, p4260, 9p
- Publication Year :
- 2022
-
Abstract
- CO<subscript>2</subscript> phase transition fracturing (CPTF) is considered to be a promising way to improve the recovery efficiency of coalbed methane in deep, tight coal seams. In addition, it is significant to the CO<subscript>2</subscript>-ECBM and CO<subscript>2</subscript> storage in coal. To better understand the fracturing radius and time effects of CPTF, a field experimentation was conducted on the Ji-15 coal seam of Pingmei 8th Coal Mine. The results indicate that the fracturing radius and time effects are significantly related; with the increase in fracturing radius, the time for extraction rate to reach the peak value is shorter. The calculated value of effective fracturing radius is 7.56 m via the fitting relationship. According to the CO<subscript>2</subscript> content in different extraction boreholes after fracturing, it can be concluded that the crack zone is 5 m. In addition, the extraction rate of methane firstly increases slowly for a while, and then reaches the peak. This work could provide theoretical directions for the arrangement of fracturing and extraction boreholes in CO<subscript>2</subscript> fracturing works related to CO<subscript>2</subscript>-ECBM and gas pre-extraction in coal mining. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20711050
- Volume :
- 14
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Sustainability (2071-1050)
- Publication Type :
- Academic Journal
- Accession number :
- 156344394
- Full Text :
- https://doi.org/10.3390/su14074260