DOI: 10.11799/ce202502011
A new"two-plug-one-grout"sealing technology for long distance upward cross-layer drilling
HE Wenjie
XIE Xionggang
LIU Zhifei
Abstract：In order to solve the problem that the sealing material for long-distance layer drilling upwards will squeeze out the front end plug of the drilling due to its own gravity and it is difficult to penetrate the upper side of the long-distance layer drilling upwards,a new"two-plug-one-grout"sealing technology was adopted.Through simulation experiments using 80 mm diameter steel pipes to simulate drilling,it was found that the material of the sealing section filled the entire sealing space,and the slurry at the front end of the bag was tight.The on-site experimental study on the gas drainage roadway of the 20#coal seam floor in the 12 centralized roadway of Zhongheng Coal Mine in Guizhou Province shows that the new"two-plug-one-grout"sealing technology is less affected by changes in drilling angle,and its average gas drainage concentration is always above 60%.However,the average gas drainage concentration of the original sealing technology always decreases with the increase of drilling angle,and its maximum average gas drainage concentration is only 36.3%;The average gas drainage concentration attenuation rate of the new"two-plug-one-grout"sealing technology is less than 0.02,while that of the original technology is greater than 0.2.The results indicate that the new sealing technology is more suitable for long distance upward cross-layer drilling than the original one.
Keywords：long distance upward cross-layer drillingnew"two-plug-one-grout"technologysealing lengthdrilling inclination angleaverage gas drainage concentration
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 75-81 )