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基于高精度全自动陀螺全站仪定向特点,分析了井下定向边误差的来源.根据中误差传播率,对定向边方位精度进行估算,并提出了“2+2+1”的定向模式;根据对中误差对定向方位精度的影响分析,尽量延长定向边边长,可以减小对中误差对定向边方位的影响,提高定向精度.
Based on the orientation characteristics of the high-precision gyro total station, the source of directional error of the downhole is analyzed.According to the medium error propagation rate, the azimuth accuracy of the directional edge is estimated and a directional pattern of “2 + 2 + 1 ” is proposed ; According to the analysis of the effect of centering error on the orientation azimuth accuracy, extending the length of directional edge as much as possible can reduce the influence of centering error on the orientation edge orientation and improve the orientation accuracy.