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Patent
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G01V 1/22 (2006.01) E21B 47/18 (2006.01) G01V 1/40 (2006.01) G08C 23/00 (2006.01)
Patent
CA 1213030
-23- ABSTRACT OF THE DISCLOSURE An electronic noise filtration system for use in improving the signal to noise ratio of acoustic data transmitted from a downhole transducer in a measurement while drilling system. Signals from a pair of receiving acoustic transducers located in the mud flow path directed downhole are input to a differen- cing amplifier. The RMS output of the amplifier is converted from an analog to a digital signal and then processed by a com- puter programmed with a least mean squares technique for mini- mizing the signal. The input from one receiving transducer is routed through a delay line wherein a programmable clock controls the timing of the signal delay. The delay time is controlled and adjusted by the computer's calculation of the frequency with which the clock should drive the delay line to minimize the dif- ference between the two received transducer signals. This func- tion minimizes ambient noise in the acoustic transmission line formed by the column of drilling fluids when no data transmissions are being made. Computer analysis and adjustment of the delay time effectively maximizes filtration of acoustic noise due to mud pump pulses and or reflections of noise from the pump thereof without limitation to the geometrical configuration or other noise related variables.
457019
Halliburton Energy Services Inc.
Kirby Eades Gale Baker
Nl Industries Inc.
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