Well Trajectory Measurement Error Based on Gyro Survey

Gyroscopic survey technology is one of the key technologies to promote progress directional drilling technology. It great practical significance study error well trajectory measurement based on gyro surveys and identify main sources. This paper introduces sources which lead uncertainty borehole position in gyroscopic survey, six models, calculation model contribution rate ellipse. The differences between MWD errors are investigated with an example. results show that cannot reduce compared environment without magnetic interference. static by a three-axis inclinometer more beneficial for improvement accuracy position. contribute also different vertical section, build-up horizontal section. Unlike source g-dependent sensor significantly trajectory. Therefore, can be reduced improving gyroscope tool reducing influence spin mass unbalance.