陀螺罗盘定向测量中工具面角计算方法探讨

针对定向钻井中 ,当井斜角较小 ( I<3°) ,用陀螺罗盘测得的工具面角极不准确 ,通常是用陀螺高边代替工具面角 ,而且必然导致误差的问题进行研究 .研究表明 ,即使在这种情况下 ,完全可以求得准确的工具面角 ;给出了计算工具面角的准确公式 ,还对该公式做了进一步简化 ,并对简化公式进行了误差分析 .

Discussion on Calculation of Tool Face Angle in Gyrocompass Measuring Angle

In directional drilling, tool face angle is one of the important parameters controlling wellbore trajectory. But when drift angle is little (less than 3°), the tool face angle surveyed with a gyrocompass is inaccurate. Generally, it is replaced with spinning top rake, so there is difference between them. The research result in the paper shows that accurate tool face angle can still be obtained under this circumstance. The calculation formula of the accurate tool face angle is presented. The formula was also simplified, and the error analysis of the simplified formula was carried out. The analysis result shows that the error is allowable.