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AssigneeNorthland Energy Corporation
InventorJoseph Kinder
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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.
A method for controlling a rotary blowout preventer having a first fluid circuit and a second fluid circuit independent from the first fluid circuit mounted over a well bore, comprising the steps of:
A rotary blowout preventer having a stationary body and a rotating body within the stationary body, the rotating body including a packer assembly mounted within the stationary body, comprising:
A rotary blowout preventer having a stationary body, a rotating body including a packer assembly mounted within the rotating body, an upper bearing and a lower bearing mounted between the stationary body and the rotating body, a first seal and a second seal mounted between the stationary body and the rotating body respectively below and above the lower bearing and the upper bearing wherein a first fluid circuit is defined into and out of the stationary body and between the stationary body, the rotating body, the first seal and the second seal, comprising:
A rotary blowout preventer having a stationary body having a top closure connectable to the stationary body, a rotating body including a packer assembly having a packer sleeve mounted within the rotating body, an upper bearing and a lower bearing mounted between the stationary body and the rotating body, a first seal and a second seal mounted between the stationary body and the rotating body respectively below and above the lower bearing and the upper bearing wherein a first fluid circuit is defined into and out of the stationary body and between the stationary body, the rotating body, the first seal and the second seal, comprising:
Dependencies are inferred from the claim text.