JI C H.Angle compensation and correction technology based on the offset law of cross-seam borehole[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):34-39.

doi:10.16186/j.cnki.1673-9787.2023010027

Received:2023/01/16

Revised:2023/04/20

Published:2023/07/25

Angle compensation and correction technology based on the offset law of cross-seam borehole

JI Chaohui1,2

1.State Key Laboratory of the Gas Disaster Detecting，Preventing and Emergency Controlling，Chongqing  400037，China;2.Chongqing Research Institute，China Coal Technology and Engineering Group，Chongqing  400037，China

Abstract:In view of the general offset during drilling cross-layer extraction borehole，which results in large deviation between the actual meeting coal point and the design point，and extraction blind zone in pre-degased coal seam，theoretical analysis and field test methods were used to study on deviation correction technology of the borehole.The drilling trajectory data measured by the drilling trajectory instrument was used to fit the linear relationship formula between the deviation values of pitch angle and azimuth angle and borehole depth by use of the least squares method，and the law of borehole offset was obtained.Based on the borehole offset law，a technology of angle compensation correction was proposed to provide guidance for correcting the construction parameters of subsequent or supplementary borehole.When the hole was drilled，the design depth of borehole was substituted into the linear relationship formula，the pitch angle and azimuth deviation angle at the meeting coal point were calculated，and the deviation angle was increased in reverse to ensure that the actual meeting coal point falled at the design point.According to the field practice of the correction technology，the azimuth deviation value of the actual meeting coal point of the borehole reduced to 0.68°，and the pitch angle deviation value droped down to 0.76°，which was basically the same with the design position.It showed that the angle compensation method was feasible and reliable based on the borehole offset law，and met the requirements of engineering practice accuracy.

Key words:borehole offset law;angle compensation method;borehole correction deviation technology;regional pre-drainage of cross-seam borehole

基于穿层钻孔偏移规律的角度补偿纠偏技术_冀超辉.pdf