关键词: 定向钻进, VLD-1000定向钻机, 钻孔轨迹控制, 开分支侧钻

Abstract: For high efficient gas drainage from coal seam of underground mine, aiming to control the underground gas disasters,Since 2000, the VLD-1000 directional rig has been introduced into China for dealing with gas controlling for High Grade Gassy Mine and Coal&Gas Outburst Mine. Currently, the total quantity of VLD-1000 is 120. 108 of them are track rigs and others are modular rigs . Some VLD-1000 rigs are standing idle due to the limit practice and unripe technology in operation and running. Through analyzing misapplications of directional drilling technology such as tracking drilling plot, reserve branch point and branch-sidetracking, the counter-measures are selected accordingly for improving the success rate and efficiency of directional drilling.