Remote actuation of downhole tools using fluid pressure from...

Details Remote actuation of downhole tools using fluid pressure from... Remote actuation of downhole tools using fluid pressure from...

E - Fixed Constructions

21

B

E21B 47/12 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2635306

An apparatus for and a method of transmitting signals from the surface of a well to a location downhole in the well utilize a downhole fluid pressure sensor (52), a signal processing means (54; 56; 58) located downhole in electrical connection with the pressure sensor (52) and a downhole programmable logic unit (60) capable of counting at least two signals received by the downhole pressure sensor (52). Typically, signals transmitted from the surface comprise a peak in pressure of downhole fluid located in production tubing run into a well bore and these signals are sensed by the downhole fluid pressure sensor (52). The logic unit (60) outputs a signal to a tool to be actuated if it receives a number of signals within a particular time period, wherein the logic unit (60) actuates the tool by the frequency of signals received rather than the amplitude of the signals received.

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