RATE GYRO WELLS SURVEY SYSTEM INCLUDING NULLING SYSTEM

摘要

A method for well borehole survey is set out. A sonde supports X and Y accelerometers and X and /A sensors on a rate gyro having a Z axis aligned with the sonde. On a slickline, or within a drill string, the sonde is used to measure four variables, these being Gx and Gy, Ax and Az. This enables well azimuth and inclination to determined. Measuring depth enables a survey to be made.