Analysis and identification of a drilling fluid column based on

Details Analysis and identification of a drilling fluid column based on Analysis and identification of a drilling fluid column based on

1990-09-10

1991-10-08

Kyle, Deborah L.

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

367 83, 175 40, G01V 100

Patent

active

050558374

ABSTRACT:
The present invention comprises a method and apparatus for estimating and identifying the channel filter characteristics of the drilling fluid communictions channel (e.g. standpipe) based on surface decoding of the MWD data signal. The channel filter characteristics can be mathematically defined by the transfer function of the channel. The transfer function is a mathematical model defining the input-output relationship of a physical system. The present invention may also characterize the channel filter defined by the drilling mud in the annulus between the borehole and the drillstring.

REFERENCES:
patent: 3895343 (1975-07-01), Farr
patent: 4215425 (1980-07-01), Waggener
patent: 4590593 (1986-05-01), Rodney
patent: 4642800 (1987-02-01), Umeda
patent: 4730281 (1988-03-01), Rodney et al.
patent: 4750157 (1988-06-01), Shei
patent: 4878206 (1989-10-01), Grosso et al.

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