Baker Hughes Corporation

Computalog Research, Inc.

Edward Bryant Tickell, Jr

Dick Lee Knox

Gordon Lee Besser

Dwight A Bloomfield

Peter J Schoch

Lonnie M Moseley

John Dee Martin, Jr

Cecil Glynn Davis

The present invention impresses the data on the power signal by utilizing a saturable core reactor. The saturable core reactor uses two cores. Each core has both load windings and control windings. The control windings are selectively energized to alter an electrical characteristic of the current passing through the load windings. The saturable core reactor is designed with cores made of a highly magnetically permeable material so that the cores are easily saturated. The cyclical saturation of the cores achieved by the load current, and the selective saturation of the cores achieved by selectively applying a control current, results in 'deformations' being selectively formed at the zero crossings of the load current waveform. These 'deformations' can be selectively formed on the power signal to represent a binary data stream. Once the series of 'deformations' is impressed onto the power signal, the 'deformations' are communicated from one point on the power cable to another point on the power cable together with the power signal. The 'deformations' are then read and transformed into a binary data stream. Thus, the power cable is converted from a mere power cable to a power cable capable of transmitting both power and data simultaneously.

Method and apparatus for transmitting data over a power cable utilizing

An induction logging tool is disclosed for utilization in conjunction with surface electronic equipment for measuring a characteristic of subsurface formations. A transmit signal which is comprised of a repetitive sequential series of at least three transmit frequencies is generated by coupling an oscillator to a transmitter coil and a plurality of selectable tuning capacitors. A signal characteristic of the response of the formation to this transmit signal is detected at a receiver coil array and two phase sensitive detectors are then utilized to generate output signals indicative of the magnitude of the X and R components of the formation signal which is in phase with a reference phase signal. The output signal of each phase sensitive detector is then utilized to accurately determine the X and R component of the receiver coil signal for each frequency by nulling the output of the phase sensitive detector utilizing a closed loop conversion circuit which eliminates errors due to phase and gain variations. The output signal is then compensated by convolving the output of the phase sensitive detector with one of multiple filter coefficient sets which are each associated with a particular transmit frequency, for each portion of the output signal which is attributable to a particular transmit frequency. Each filter coefficient set preferably comprises a Finite Impulse Response (FIR) filter, which is derived by altering each filter coefficient to induce a specified response of the induction tool to a simulated step function.

Multiple transmit frequency induction logging system with closed loop

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Crowley, TX, United States of America

Edward Bryant Tickell, Jr