Drilling signal transmission method and system

Details Drilling signal transmission method and system Drilling signal transmission method and system

1995-05-24

1997-09-02

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

364422, G01V 140

Patent

active

056639295

ABSTRACT:
The present invention relates to a method and to a system for transmitting a signal associated with drilling conditions and/or the behavior of a drill string element. The present invention comprises stages of segmentation of the signal, and of decomposition of each segment into a wavelet so as to obtain the wavelet coefficients. The method also comprises the stage of transmission of certain characteristic coefficients. The present invention also relates to a system suited for implementing the method.

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"Lapped Transforms for Efficient Transform/Subband Coding", H.S. Malvar, IEEE Transactions On Acoustics, Speech, And Signal Processing, vol. 38(6), Jun. 1990, pp. 969-978.
"Wave propagation and sampling theory--Part II: Sampling theory and complex waves", J. Morlet et al., Geophysics, vol. 47(2), Feb. 1982, pp. 222-236, 15 Figs.

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