Abstract: A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.
Type:
Grant
Filed:
April 1, 2004
Date of Patent:
April 28, 2009
Assignee:
Schlumberger Technology Corporation
Inventors:
Mark A. Fredette, James Stephen Hall, Mark T. Frey, Dominique Dion