Downhole signal conveying system

Details Downhole signal conveying system Downhole signal conveying system

E - Fixed Constructions

21

B

E21B 47/01 (2006.01) E21B 41/00 (2006.01) E21B 47/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2147300

Actuation of downhole tools is accomplished by inducing motion in the wireline. The downhole tool monitors such motion for predetermined patterns. Detection of a predetermined pattern actuates performance of a desired function. The pattern selected is sufficiently unique to avoid random or premature actuation. The tool may thus be actuated using ordinary nonconducting cable. In like fashion the tool can transmit stored information to the surface by a mechanical means such the resonant frequency of a mechanical signal in the cable.

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