초록 ▼

Systems and method for operating subsea devices and pressure compensated reservoir systems useful therewith which in certain aspects, include a chamber with a piston therein acted on an exposed side by water, e.g. sea water, to provide operational hydraulic fluid for operating a subsea device, with

Systems and method for operating subsea devices and pressure compensated reservoir systems useful therewith which in certain aspects, include a chamber with a piston therein acted on an exposed side by water, e.g. sea water, to provide operational hydraulic fluid for operating a subsea device, with a piston rod having an end in a separate chamber acted on by a fluid to compensate for a pressure differential between the pressure of the water on one piston side and the pressure of the operational hydraulic fluid on the other piston side.

대표청구항 ▼

What is claimed is: 1. A subsea system comprising a pump system for providing operational power fluid to a subsea device for operating the subsea device, a compensated pressure reservoir system for receiving operational power fluid from the subsea device and for providing operational power fluid to

What is claimed is: 1. A subsea system comprising a pump system for providing operational power fluid to a subsea device for operating the subsea device, a compensated pressure reservoir system for receiving operational power fluid from the subsea device and for providing operational power fluid to the pump system, the compensated pressure reservoir system comprising a body with an interior chamber, a first opening in the body, and a second opening in the body, an amount of operational hydraulic fluid in the interior chamber under a first pressure, a piston movably and sealingly mounted in the interior chamber, the piston closing off the first opening and preventing hydraulic fluid from exiting through the first opening from the interior chamber, the piston having an outer surface and an inner surface, the operational hydraulic fluid applying the first pressure against the piston's inner surface, fluid exterior to the pressure compensated reservoir able to apply pressure to the outer surface of the piston, a piston rod with a first end and a second end, the first end connected to the interior surface of the piston, the second end projecting through the second opening, a piston rod chamber having an interior, the second end of the piston rod projecting into and movable in the piston rod chamber, at least one operating channel through the body for providing hydraulic fluid from the reservoir for operating an hydraulically-powered apparatus, a fluid system for providing fluid under pressure to the second piston rod end within the piston rod chamber, a channel through the piston rod chamber, the fluid system in fluid communication with the interior of the piston rod chamber via the channel, the outer surface of the piston greater than the inner surface of the piston and the outer surface positioned for pressure thereagainst by the fluid exterior to the body creating a pressure differential between the first pressure of the operational hydraulic fluid and pressure applied by the fluid exterior to the body, and the pressure of the fluid of the fluid system compensating for the pressure differential. 2. The subsea system of claim 1 further comprising the pump system comprising pump apparatus, motor apparatus for driving the pump apparatus. 3. The subsea system of claim 1 further comprising accumulator apparatus in fluid communication with the pump apparatus for receiving operational hydraulic fluid from the pump apparatus and for maintaining said fluid under pressure for later use. 4. The subsea system of claim 1 further comprising valve apparatus for selectively placing the pump apparatus in fluid communication with the subsea device. 5. The subsea system of claim 1 further comprising a control system for controlling the pump system and the subsea device. 6. The subsea system of claim 1 further comprising umbilical apparatus for providing power to the control system and communication between the control system and control apparatus remote from the control system. 7. The subsea system of claim 1 further comprising the pump system comprising pump apparatus, and motor apparatus for driving the pump apparatus, valve apparatus for selectively placing the pump apparatus in fluid communication with the subsea device, a control system for controlling the pump system, the valve apparatus, and the subsea device, and umbilical apparatus for providing power to the control system and communication between the control system and control apparatus remote from the control system. 8. The subsea system of claim 1 further comprising the subsea device, and the subsea device is a blowout preventer. 9. The subsea system of claim 1 further comprising the subsea device, and the subsea device is a subsea coil tubing apparatus. 10. The subsea system of claim 1 wherein the compensated pressure reservoir system further comprises the fluid system including a housing with gas under pressure therein, a bladder system with a compressible bladder apparatus positioned so that the a portion thereof in the housing is acted on by the gas in the housing, hydraulic fluid in the bladder apparatus, the bladder apparatus in fluid communication via a flow line with the piston rod chamber so that hydraulic fluid in the bladder system is applied to the second end of the piston rod, and wherein the amount of operational hydraulic fluid in the interior chamber is at least 100 gallons. 11. A method for compensating for water pressure on a subsea device, the method comprising placing the subsea device in fluid communication with an interior chamber of a compensated pressure reservoir system, the compensated pressure reservoir system comprising a body with an interior chamber, a first opening in the body, and a second opening in the body, an amount of operational hydraulic fluid in the interior chamber under a first pressure, a piston movably and sealingly mounted in the interior chamber, the piston closing off the first opening and preventing hydraulic fluid from exiting through the first opening from the interior chamber, the piston having an outer surface and an inner surface, the operational hydraulic fluid applying the first pressure against the piston's inner surface, fluid exterior to the pressure compensated reservoir able to apply pressure to the outer surface of the piston, a piston rod with a first end and a second end, the first end connected to the interior surface of the piston, the second end projecting through the second opening, a piston rod chamber having an interior, the second end of the piston rod projecting into and movable in the piston rod chamber, at least one operating channel through the body for providing hydraulic fluid from the reservoir for operating an hydraulically-powered apparatus, a fluid system for providing fluid under pressure to the second piston rod end within the piston rod chamber, a channel through the piston rod chamber, the fluid system in fluid communication with the interior of the piston rod chamber via the channel, the outer surface of the piston greater than the inner surface of the piston and the outer surface positioned for pressure thereagainst by the fluid exterior to the body creating a pressure differential between the first pressure of the operational hydraulic fluid and pressure applied by the fluid exterior to the body, and the pressure of the fluid of the fluid system compensating for the pressure differential.