Active drill stabilizer assembly
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United States of America Patent
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-
Dec 30, 1980
Grant Date -
N/A
app pub date -
Nov 15, 1979
filing date -
Nov 15, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present disclosure concerns an active drill stabilizer assembly for arrangement in a drill string directly behind a conventional or modified drill bit that utilizes drilling fluid as a sensing and working deviation/correction energy source. In a sensing loop of the present invention, the drilling fluid passes through groups of pitch and yaw sensor outlet ports and orifices that direct the fluid against the bore-hold side wall. The flow through the orifices is proportional to the gaps between the outlet ports and the well bore side wall and grouping of the sensors provides for an 'averaging effect' to the fluid flow that ignores local side wall surface irregularities and produces an instantaneous venturi throat pressure for each axis.
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