Force balanced rotating pressure control device
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United States of America Patent
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Jun 29, 2010
Grant Date -
Dec 4, 2008
app pub date -
Jun 4, 2007
filing date -
Jun 4, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Force balancing adjusts hydraulic fluid pressure in an upper piston area of a Rotating Pressure Control Device (RPCD) that has an inner housing rotatably engaged within an outer housing by an upper bearing and a lower bearing. The hydraulic fluid pressure is adjusted to balance net force in a upper piston area and a lower piston area. The fluid pressure adjustment creates a force differential that balances the total load transmitted through the upper bearing and the lower bearing and thereby extends the life of the sealing element and bearings. Additionally, a wear indicator signals the end of the useful life of the drill pipe sealing element.
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