Valves and valve actuation – Blow-out preventers – Deformable annulus
Reexamination Certificate
2006-02-28
2006-02-28
Keasel, Eric (Department: 3754)
Valves and valve actuation
Blow-out preventers
Deformable annulus
C166S084300, C277S326000
Reexamination Certificate
active
07004444
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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Keasel Eric
Oathout Mark A.
Precision Drilling Technology Services Group Inc.
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