Compressive seal and pressure control arrangements for downhole tools
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United States of America Patent
Stats
-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Apr 13, 1990
filing date -
Apr 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The disclosure relates to downhole drilling motors which include seal arrangements and pressure control assemblies for staging the pressure between the two seal assemblies, with each pressure control assembly including a rotary element for displacing a piston, and the piston controlling one or several valves.
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Cited Art Landscape
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