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- Title
Micro-pilot test for optimized pre-extraction boreholes and enhanced coalbed methane recovery by injection of liquid carbon dioxide in the Sangshuping coal mine.
- Authors
Wen, Hu; Cheng, Xiaojiao; Chen, Jian; Zhang, Chunru; Yu, Zhijin; Li, Zhenbao; Fan, Shixing; Wei, Gaoming; Cheng, Bangkai
- Abstract
• The continuous injection process of LCO 2 in underground coal mine was explored. • The effective displacement radius of LCO 2 reached 20 m. • The maximum CH 4 concentration and flux rate increased by 2.41 and 2.34 times. The extraction efficiency of high-gas coal seams is low in China with a large number of pre-drainage boreholes. In this study, we analyze the coal seam gas displacement mechanism using liquid carbon dioxide by combining theoretical analysis, experiments, and field tests. Changes of gas displacement efficiency with time under different displacement flow and pressure conditions are determined. We propose a coalbed methane displacement method using liquid carbon dioxide and apply the model in a field test carried out in well No. 2 of the Sangshuping coal mine. The results show that the injection of liquid carbon dioxide in coal seams is a pressure swing adsorption process. The effective displacement radius from the in-situ tests reaches 20 m. The maximum CH 4 extraction concentration in the test area is 65%, which is 2.41 times higher than that of the original coal seam (27%). The maximum methane extraction flux rate is 0.884 m3/min, which is 2.34 times that of original coal seam (0.377). Implementation of liquid carbon dioxide displacement coalbed methane technology optimizes borehole arrangement and enhances coalbed methane extraction.
- Subjects
CHINA; LIQUID carbon dioxide; CARBON dioxide injection; COALBED methane; COAL mining; PRESSURE swing adsorption process; BOREHOLES; CARBON dioxide; SUPERCRITICAL fluid extraction
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2020, Vol 136, p39
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2019.12.036