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Patent
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G01V 3/24 (2006.01) E21B 17/00 (2006.01) E21B 47/12 (2006.01)
Patent
CA 1210062
ABSTRACT OF THE DISCLOSURE An information while drilling apparatus and method for characterizing strata in the vicinity of a drill bit at the lower end of a drill string, includ- ing a down-hole module unit and surface receiving and control units. Excitation currents are caused to pass through the drill string, drill bit and surround- ing strata and the current flowing through the drill bit is sensed by a first toroidal transformer that encircles the drill string immediately above the drill bit. The sensed current, which is characteristic of the strata adjacent to and below the drill bit, is detected to form logging signals. A second toroidal transformer couples the logging signals to the electrically conductive drill string for transmission to the surface receiving unit. The frequency of the excitation current is adjustable to permit character- ization of the strata at various distances from the drill bit. The frequency of the transmitting signal is also adjustable to compensate for varying degrees of signal attenuation along the transmission path. Control of the excitation and transmission frequencies is effected by communications from the surface control unit in response to stored operating instructions or operator inputs.
438106
Gowling Lafleur Henderson Llp
Macleod Laboratories Inc.
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