Abstract: To determine effect on a magnetic field caused by a lining structure in a wellbore, an array may be deployed into the wellbore lined with the lining structure. The array comprises a plurality of sensors including sensor A configured to operate as a transmitter, sensor B configured to operate as either a transmitter or a receiver, and sensor C configured to operate as a receiver. The array measures magnetic fields using sensor B as a receiver and sensor C in response to activation of sensor B as a transmitter and sensor A. A plurality of lining structure correction factors can be calculated based on the measured magnetic fields, based on the reciprocity of the sensors.
Type:
Grant
Filed:
October 5, 2007
Date of Patent:
September 14, 2010
Assignee:
Schlumberger Technology Corporation
Inventors:
Brian Clark, Frank Morrison, Edward Nichols, Hong Zhang, Richard A. Rosthal