Method for processing signals from an MWD electromagnetic resist

Details Method for processing signals from an MWD electromagnetic resist Method for processing signals from an MWD electromagnetic resist

1992-11-02

1994-07-12

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324369, G01V 338, G01V 318

Patent

active

053292359

ABSTRACT:
This invention discloses an adaptive deconvolution method for enhancing the vertical resolution of an MWD (measurement-while-drilling) electromagnetic resistivity logging tool. The tool measures the total differences between the voltages induced in a pair of spaced-apart receiver coils. A deconvolution filter, appropriate to the current position of the logging tool in the borehole, is derived according to the weighted average of the measured phase differences. Using the so-derived deconvolution filter, the measured phase differences are spatially deconvolved thereby to enhance the vertical resolution of the measurements by reducing the shoulder-bed effects.

REFERENCES:
patent: 4471436 (1984-09-01), Schaefer et al.
Zhou, Q.; Hilliker, D. J.; Norwood, D.; Geometric Factor and Adaptive Deconvolution of MWD-PWR Tools, The Log Analyst, Jul.-Aug. '92, pp. 390-398.
Zhou, Q., Hilliker, D. J., MWD Resistivity Tool Response In A Layered Medium, Geophysics, vol. 56, No. 11 (Nov. 1991), pp. 1738-1748.

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