Strengthening borehole configuration from the retaining roadway for greenhouse gas reduction: a case study

A monitoring trial was carried out to investigate the effect of boreholes configuration on the stability and gas production rate. These boreholes were drilled from the retaining roadway at longwall mining panel 1111(1) of the Zhuji Coalmine, in China. A borehole camera exploration device and multipl...

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Bibliographic Details
Published in:PloS one 2015-01, Vol.10 (1), p.e0115874
Main Authors: Xue, Fei, Zhang, Nong, Feng, Xiaowei, Zheng, Xigui, Kan, Jiaguang
Format: Article
Language:English
Subjects:
Air pollution
Boreholes
Case reports
Case studies
Coal industry
Coal mines
Coal Mining
Coalbed methane
Configurations
Drilling
Education
Emissions
Emissions control
Environmental Monitoring
Exploration
Flow rates
Flow stability
Flow velocity
Gas flow
Gas production
Geology
Greenhouse effect
Greenhouse Effect - prevention & control
Greenhouse gases
Laboratories
Longwall mining
Measuring instruments
Methods
Mines
Mining
Mining industry
Natural gas
Oil and gas production
Pollution control
Reduction
Roads & highways
Science
Steel pipes
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Summary:A monitoring trial was carried out to investigate the effect of boreholes configuration on the stability and gas production rate. These boreholes were drilled from the retaining roadway at longwall mining panel 1111(1) of the Zhuji Coalmine, in China. A borehole camera exploration device and multiple gas parameter measuring device were adopted to monitor the stability and gas production rate. Research results show that boreholes 1~8 with low intensity and thin casing thickness were broken at the depth of 5~10 m along the casing and with a distance of 2~14 m behind the coal face, while boreholes 9~11 with a special thick-walled high-strength oil casing did not fracture during the whole extraction period. The gas extraction volume is closely related to the boreholes stability. After the stability of boreholes 9~11 being improved, the average gas flow rate increased dramatically 16-fold from 0.13 to 2.21 m3/min, and the maximum gas flow rate reached 4.9 m3/min. Strengthening boreholes configuration is demonstrated to be a good option to improve gas extraction effect. These findings can make a significant contribution to the reduction of greenhouse gas emissions from the coal mining industry.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0115874