Combined Barrier and Lubrication Fluids Pressure Regulation System and Unit for a Subsea Motor and Pump Module
a technology of pressure regulation system and lubrication fluid, which is applied in the direction of liquid fuel engines, drilling machines and methods, and fluid removal. it can solve the problems of unavoidable leakage of hydraulic fluid along the drive shaft, frequent pressure variation of the motor/pump module,
Inactive Publication Date: 2013-06-13
VETCO GRAY SCANDINAVIA
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Benefits of technology
The present invention provides a system for regulating the pressure of a pumped medium in a subsea motor and pump module. The system has the ability to instantly respond to changes in the pressure of the pumped medium, while maintaining a safe and stable pressure difference between the barrier and lubrication fluids. This system avoids the problems associated with long step-out distances and great water depths. The optional pressure reducing regulator allows for a smooth transition from the supply fluid pressure to the pumped medium pressure, improving the reliability and service life of the regulators.
Problems solved by technology
The motor / pump module is frequently subjected to substantial variations in pressure in the pumped medium, as well as substantial transitional loads during pump start and stop sequences.
In result of the pressure difference, a leak flow of hydraulic fluid along the drive shaft is unavoidable.
Method used
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[0039]In the drawing of FIG. 1, reference number 1 refers to a subsea motor and pump module comprising a motor that is encased in a pressurized, water tight enclosure or motor housing 2, as well as a pump rotor assembly encased in a pump housing 3. The motor driving the pump is typically an electric motor, although other drive units such as hydraulic motors or turbines may alternatively be employed.
[0040]The pump rotor is configured for displacement of a pumped medium, typically a multi-phase production fluid from a reservoir below the sea floor, which enters the pump via a pump inlet 4 to be discharged via a pump outlet 5, as illustrated by an arrow F. The pump rotor is drive-connected to the motor, and the pump interior is hydraulically separated from the pressurized (typically oil-filled) motor housing by means of a seal arrangement 6 which seals against the outside of a rotary shaft (indicated by reference number 7) by which the pump rotor is drive-connected to the motor. The pu...
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A barrier and lubrication fluids pressure regulation system for a subsea motor and pump module is disclosed, comprising a lubrication fluid circuit in flow communication with a hydraulic fluid supply via a first pressure reducing regulator (15); and a barrier fluid circuit in flow communication with the hydraulic fluid supply via a second pressure reducing regulator (14). The first pressure reducing regulator (15) is configured to reduce the supply fluid pressure in response to the pumped medium pressure at the suction side (4) or at the discharge side (5) of the pump, and the second pressure reducing regulator (14) is configured to reduce the supply fluid pressure in response to the output pressure of the first pressure reducing regulator (15). A pressure regulation unit is likewise disclosed, and arranged for housing the components of the barrier and lubrication fluids pressure regulation system in a pressurized vessel.
Description
TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates generally to subsea equipment involved in the transport of hydrocarbon production fluids from a production site at the sea floor to a sea surface or land based host facility. More specifically, the present invention is concerned with a system that is designed for management of barrier and lubrication fluid pressures in a subsea motor and pump module. In another aspect the present invention relates also to a pressure regulation unit for a subsea motor and pump module.BACKGROUND AND PRIOR ART[0002]A process fluid in subsea hydrocarbon production is typically a multiphase fluid comprising oil and gas and eventually solid matter, which is extracted from an underground reservoir. A motor / pump module is arranged on the sea floor and configured for transport of the process fluid from the reservoir to a surface or land based host facility. The motor / pump module is frequently subjected to substantial variations in pressure i...
Claims
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Login to View More IPC IPC(8): E21B33/035
CPCF04B47/06F04B49/08E21B33/035F16J15/406F04B53/18E21B43/01
Inventor TOMTER, OLE PETER
Owner VETCO GRAY SCANDINAVIA