Magnetic Ranging To An AC Source While Rotating

摘要

A method for magnetic ranging includes rotating a downhole tool in a drilling well in sensory range of magnetic flux emanating from a target well having an AC magnetic source deployed therein. The downhole tool includes a magnetic field sensor deployed therein. The magnetic field sensor measures a magnetic field vector while rotating. The measured magnetic field vector is processed to compute at least one of a distance and a direction from a drilling well to a target well.

主权项

1. A method for magnetic ranging comprising:
(a) rotating a downhole drilling tool in a drilling well in sensory range of magnetic flux emanating from a target well having an AC magnetic source deployed therein, the downhole tool including a magnetic field sensor rotatably coupled to the tool; (b) causing the magnetic field sensor to measure a magnetic field vector while rotating in (a); (c) processing the magnetic field vector measured in (b) to compute a magnetic quantity including at least one of an amplitude of a transverse component of the magnetic flux emanating from the target well and an angle between the transverse component of the magnetic flux emanating from the target well and a transverse component of Earth's magnetic field; and (d) processing the magnetic quantity computed in (c) to compute at least one of a distance and a direction from the drilling well to the target well.