Patent ID: 9158025
Filing Date: 2015-10-13
Classification: G01V

Abstract:
1. A method of conducting logging operations in a borehole intersecting an earth formation, the borehole filled with non-conducting drilling fluid, the method comprising: applying a bias voltage to a conductive shield using a power source, the bias voltage being the same as a voltage of at least one measure electrode; and reducing coupling between the at least one measure electrode and at least one return electrode in a logging tool in the borehole using the conductive shield between the at least one measure electrode and the at least one return electrode, the at least one measure electrode electrically coupled in circuit with the power source and the earth formation to inject current into the non-conducting drilling fluid and the earth formation, and the at least one return electrode electrically coupled in circuit with the earth formation to receive current returning from the earth formation and the non-conducting drilling fluid.