Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate
2009-09-18
2010-10-12
Whittington, Kenneth J (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
C324S338000
Reexamination Certificate
active
07812608
ABSTRACT:
An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array is disclosed that includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.
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Barber Thomas D.
Chesser Scott S.
Davydychev Andrei I.
Finci Bulent
Hunka John F.
Fonseca Darla
Hofman Dave
Schlumberger Technology Corporation
Sethna Shaun
Whittington Kenneth J
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