Composite Slag Discharging Drilling Technology in Soft and Outburst Coal Seam

Home > Archive>Volume 43, Issue 6, 2016 >22-25

Composite Slag Discharging Drilling Technology in Soft and Outburst Coal Seam
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                        HAO Yong-jinHAO Yong-jin
Xi’an Research Institute,China Coal Technology & Engineering Group
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LI Qiao-qiaoLI Qiao-qiao
Xi’an Research Institute,China Coal Technology DdDd Engineering Group
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WANG YiWANG Yi
Xi’an Research Institute,China Coal Technology DdDd Engineering Group
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ZHAO Jiang-pengZHAO Jiang-peng
Xi’an Research Institute,China Coal Technology DdDd Engineering Group
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DONG Chang-leDONG Chang-le
Xi’an Research Institute,China Coal Technology DdDd Engineering Group
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Affiliation:Xi’an Research Institute,China Coal Technology & Engineering Group,Xi’an Research Institute,China Coal Technology DdDd Engineering Group,Xi’an Research Institute,China Coal Technology DdDd Engineering Group,Xi’an Research Institute,China Coal Technology DdDd Engineering Group,Xi’an Research Institute,China Coal Technology DdDd Engineering Group
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Abstract:

In order to improve the gas drainage hole drilling depth and the extracting effect, based on composite slag discharging technology with medium air pressure (0.7～1.2MPa), the field test was carried out by using screw drilling tool assembly with different specifications matched with corresponding process parameters. Comparing the different application conditions, the best bottom hole assembly and the matching technologies were selected to achieve high-efficient long borehole construction in whole coal seam.

Key words:soft outburst coal seam; medium air pressure; screw drilling; composite slag discharging; gas drainage hole

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Received:January 18,2016
Revised:March 07,2016
Adopted:April 18,2016
Online: June 16,2016
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