A System and Method for Identifying Inclination and Azimuth at Low Inclinations

摘要

A downhole tool and method for identifying the inclination and/or azimuth of the downhole tool at low inclinations or unknown inclinations. The downhole tool is connectable to a tubing in a wellbore and comprises a magnetic field sensor operable to measure a magnetic field parameter in the wellbore. The downhole tool also comprises a controller operable to determine an orientation parameter for the downhole tool located in the wellbore using the magnetic field parameter, a dip angle for the magnetic field parameter, and a selected inclination value.