Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1994-08-19
1996-02-13
Dang, Hoang C.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166 53, 166319, E21B 3410
Patent
active
054905648
ABSTRACT:
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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"IRIS Dual-Valve Intelligent Remote Implementation System", published by Schlumberger Testing Services (undated but admitted to be prior art).
"Intelligent Remote Implementation System for well testing" by Schlumberger, Apr. 17, 1991.
Kyle Donald G.
Schultz Roger L.
Skinner Neal G.
Dang Hoang C.
Halliburton Company
Imwalle William M.
Kennedy Neal
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