DOWNHOLE GRADIOMETRIC RANGING FOR T-INTERSECTION AND WELL AVOIDANCE UTILIZING TRANSMITTERS & RECEIVERS HAVING MAGNETIC DIPOLES

摘要

A ranging system utilizes gradiometric data to determine the direction to and distance between a first and second well without any knowledge or involvement of the borehole or formation characteristics in order to intersect and/or avoid the second well. In general, this is achieved by deploying a downhole assembly comprising transmitters and receivers having magnetic dipoles, along with bucking receivers positioned between the transmitters and receivers.

主权项

1. A method for downhole ranging, the method comprising:
drilling a first wellbore, the first wellbore comprises an elongated conductive body; deploying at least two magnetic dipole transmitters and at least four magnetic dipole receivers in a second wellbore; inducing a current along the first wellbore using the transmitters that results in a magnetic field being emitted from the first wellbore; receiving the magnetic field utilizing the receivers, wherein a gradient field is measured; and utilizing the gradient field to determine a distance between the first and second wellbores.