Pressure change signals for remote control of downhole tools

Details Pressure change signals for remote control of downhole tools Pressure change signals for remote control of downhole tools

E - Fixed Constructions

21

B

E21B 47/12 (2006.01) E21B 34/10 (2006.01) E21B 34/16 (2006.01) E21B 47/00 (2006.01) H04B 13/02 (2006.01)

Patent

CA 2111735

Methods of controlling a downhole tool in a well are disclosed wherein pressure change signals are introduced into a column of fluid standing in the well. The command signal includes at least one high level pressure change applied to the column of fluid. The high level pressure change includes a change from a first value to a second value, with the second value being at least about 1,000 psi above hydrostatic pressure of the column of fluid in the well, and with pressure being maintained at the second value for an interval of time corresponding to information stored in a control system of the downhole valve. A number of suitable command signal formats are disclosed, particularly including pressure drop signals.

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