Method for transmitting downhole data in a reduced time

Details Method for transmitting downhole data in a reduced time Method for transmitting downhole data in a reduced time

1987-05-04

1989-10-10

Steinberger, Brian S.

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

367 81, 364422, G01V 100

Patent

active

048735221

ABSTRACT:
A tool face orientation of a directional drill bit within a borehole is efficiently communicated to the well surface by communicating only changes in the tool face orientation. In the first embodiment after the entire tool face orientation is measured and transmitted uphole, and thereafter changes of the tool face orientation as measured with respect to the center of spatially fixed sectorial ranges are transmitted uphole. The magnitude of the changes relative to the center of a fixed sectorial range, being smaller than the range of the entire tool face orientation, allow the subsequent transmission to be made using words of shorter length. Alternatively, the changes in tool face orientation may be measured with respect to a sliding reference point. The sliding reference point may, for example, be the mean value of the prior ten measurements and any previous mean values. The sliding sector will then be held until change in the tool face orientation cause the tool to go out of the sectorial range of the sliding reference point, at which point a new sliding reference is defined which inherently includes the tool face within its range.

REFERENCES:
patent: 3691363 (1972-09-01), Armistead
patent: 3771118 (1973-11-01), Lichte, Jr. et al.
patent: 3863203 (1975-01-01), Patton et al.
patent: 4513403 (1985-04-01), Troy
patent: 4593559 (1986-06-01), Brown et al.
patent: 4686625 (1987-08-01), Bryan
Hearn, Ed, "How Operators Can Improve Performance of Measurement While Drilling Systems", Oil & Gas Journal, Oct. 1984, pp. 80-84.

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