Research and application of high-level directional drilling holes in gas extraction lap part
ZHANG Mingjie
DENG Wenbo
TAN Zhihong
LI Xuze
LIU Cao
YUAN Shuai
Abstract：The reasonable lap of high-level directional drilling holes in adjacent drilling sites is an important link to ensure the stable extraction effect and improve the effective utilization rate of drilling holes.According to the results of the research on the mechan-ism of gas extraction in the high-level directional drilling holes of the roof fracture zone,by analyzing the influencing factors of the extraction effect such as the spatial position of the high-level directional drilling holes,the distribution characteristics of the roof fracture zone of the coal seam,and the drilling trajectory,the reasonable overlapping part of the borehole for successful replacement was determined,and the engineering application was carried out in Dangjiahe Coal Mine.The application shows that the overlap-ping length of 80-121 m borehole can meet the gas extraction effect,and the outer end of the lapping position can reduce the drilling amount of each borehole by about 40 m.
Keywords：directional drilling extractionlap lengthfracture zone extractiondrilling leveldrilling trajectorydrilling utilization
Publication Date：2024-05-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 93-99 )