Directional drilling technology is the mainstream trend of current underground drilling.Medium and large coal mines often purchase drilling rigs or MWD devices from different manufacturers in batches according to the needs of mine safety production.The accuracy evaluation and calibration of new MWD devices is a technical problem faced by coal mine users.In this paper,based on the existing more accurate measuring device,the new measuring device is evaluated and calibrated by the method of borehole retest,and good results are obtained.At the same time,the measurement accuracy caused by the change of magnetic declination is discussed.
关键词
定向钻/轨迹测量/误差分析/精度校准/瓦斯抽放/地质防治水
Key words
directional drilling/trajectory measurement/error analysis/accuracy calibration/gas drainage/geological water prevention and control
维普
万方数据