G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/30 (2006.01) E21B 47/00 (2006.01) G01V 3/28 (2006.01)
Patent
CA 2363789
Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non- conductive support member. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique. An embodiment of the instrument includes an antenna disposed between a pair of electrically coupled electrodes. The antenna is disposed on the instrument such that it comprises a tilted or transverse magnetic dipole.
Barber Thomas D.
Bonner Stephen D.
Clark Brian
Homan Dean M.
Omeragic Dzevat
Schlumberger Canada Limited
Smart & Biggar
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