Rotating blowout preventer with independent cooling circuits and thrust bearing
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 28, 2006
Grant Date -
Nov 11, 2004
app pub date -
Jun 15, 2004
filing date -
Dec 12, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent from the second fluid circuit although they share a seal interface. A fluid is introduced into the first fluid circuit at a pressure responsive to the well bore pressure. A fluid is introduced into the second fluid circuit at a pressure responsive to and lower than the pressure of the fluid in the first circuit. Adjustable orifices are connected to the outlet of the first and second fluid circuits to control such pressures within the circuits. Such pressures affect the wear rates of the seals. The system can therefore control the wear rate of one seal relative to another seal. A thrust bearing is added to share the load placed upon the upper bearings. The thrust bearing is connected between the top end of a packer sleeve and the stationary body.
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