USE OF INDEPENDENT MEASUREMENTS IN MAGNETIC RANGING

摘要

Methods for obtaining multiple independent magnetic ranging measurements during a well twinning operation are disclosed. The methods may include using a magnetic ranging tool having first and second axially spaced solenoids. The methods may alternatively and/or additionally include using a magnetic ranging tool having an electromagnet to calibrate magnetized casing. The methods may further include measuring the axial component of a magnetic field internal to a magnetized casing string after deployment of the string in a target well.