Patent ID: 7598742

Claim:
An induction resistivity tool incorporated into a downhole tool string, comprising: an outer wall of a downhole component comprising an outer diameter; at least one induction transmitter assembly disposed along the outer diameter; the at least one transmitter assembly comprising at least one induction transmitter coil wound about at least one core; the at least one transmitter coil projects an induction signal outward from the outer wall when the at least one transmitter coil is carrying an electrical current; the at least one coil comprises first and second ends and at least one bucking coil disposed adjacent each of the first and second ends and the outer wall; wherein transmitter assembly creates electromagnetic fields that originate the induction signal from outside the outer wall and substantially prevent the signal from entering the outer wall; and wherein the at least one transmitter assembly comprises a plurality of induction transmitter coils, each coil being wound about at least one core.