High Efficient Gas Drainage Technology with Fast Full Length Screen Pipe for Borehole Protection in Soft Seam
LIU Qing-quan
TONG Bi
FANG You-xiang
TU Qing-yi
GUO Shuai-fei
Abstract：According to the status of a low borehole gas drainage concentration in a soft seam,small drainage quantity and borehole easycol-lapsed and jammed,a high efficient gas drainage technology with fast full length screen pipe for the borehole protection in the soft seam was provided and the related key equipment was introduced.The application in a typical mine site of Huainan Mining Area showed that with the application of the technology,75% of the borehole could be realized and completed within one hour,all boreholes could be completed with two hours and 85% of the borehole screen pipe could be set to 81% of the borehole depth.A gas drainage volume fraction of a single bore-hole could be increased from 30% to 60% and the pure gas drainage volume could be increased from 0.03 m3/min to 0.06 m3/min.The unit gas drainage volume fraction was increased about 120% and pure gas drainage quantity was increased from 2. 0 m3/min to 4. 2 m3/min.The application of the technology could eliminate borehole failure caused by borehole collapsed,could highly improve the reliability of borehole gas pre-drainage and could ensure the gas pre-drainage effect of coal mining face.
Keywords：soft coal seamborehole along seamfast full length screen pipegas drainage
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 58-61 )