G - Physics – 01 – V
Patent
G - Physics
01
V
324/9
G01V 3/28 (2006.01)
Patent
CA 1161112
20,1614 Apparatus and Method of Induction Logging Abstract Apparatus and method are disclosed for determining properties of subsurface formations surrounding a bore- hole by induction logging. The properties which can be determined include the formation dip angle and dip azimuth angle. Indications of formation anisotropy can also be obtained. An array of individually energizable transmitter coils is provided, preferably including three coils having mutually orthogonal axes. Electronic transmitter steering circuitry is provided for controlling the energizing means to electronically steer the direction of the magnetic moment resulting from the magnetic field components generated by the transmitter coils. An array of receiver coils is also provided along with receiver processing circuitry for processing signals induced in the receiver coils. The array of receiver coils preferably includes three receiver coils having mutually orthogonal axes. The receiver processing circuitry is capable of individually sensing the signals induced in the receiver coils and operates to combine the sensed signals. The receiver processing circuitry also includes electronic receiver steering circuitry for controlling the relative ampli- fication of the sensed signals to steer the effective sensing direction of the receiver. The receiver steer- ing circuitry is coordinated with the transmitter steer- ing circuitry and is operative to rotate the effective sensing direction of the receiver in a plane perpendicu- lar to the direction of the transmitter magnetic moment.
367740
Schlumberger Canada Limited
Smart & Biggar
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