Onesubsea IP UK Limited

Helge Dale

Anders Brunvold

Aasmund Valland

Knut Harald Klepsvik

Hans Fredrik Kjellnes

Åsmund Valland

Ina Ekeberg

Åsmund Valland

Stig Kåre Kanstad

Svein-Arne Marthinussen

Per Bloch Helmers

Per Gunnar Grimstad

ÅSmund Valland

A subsea fluid processing system includes an electric motor that rotates a shaft on which impellers are fixedly mounted. Diffusors are static and fixed to the pump housing. The electric motor includes a rotor surrounding the shaft and a stator that is filled with a dielectric stator fluid. The stator is sealed or 'canned.' The inner surface of the stator which faces the rotor is canned with a canning non-metallic material. The motor, as well as bearings for the rotating shaft are lubricated and cooled with a fluid that in some cases is taken from the process fluid and some alternative source. Alternative sources include: MEG, methanol, treated seawater and untreated seawater.

Subsea fluid processing system having a canned fluid-filled stator and cooling mechanism

Subsea fluid processing system having a canned motor stator filled with a dielectric fluid

A subsea injection system may include one or more filter stages to filter seawater and output filtered seawater and waste seawater. The waste seawater may include particles removed from the filtered seawater. The subsea injection system may also include a combined pump having an injection pump to motivate the filtered seawater into a reservoir of a geological formation. The combined pump may also include a filter pump to motivate the seawater through the filter stages and a motor to drive the injection pump and the filter pump. The motor may drive the filter pump via an indirect coupling such that the motor is sealed from the filter pump at the indirect coupling.

Subsea fluid injection system

A system for dewatering a subsea gas pipeline includes a pig launcher at the pipeline's upper end, which may be at or near the sea surface, and a pig receiver at the pipeline's lower end, which may be at or near the sea floor. A multiphase pump unit is deployed at the pipeline lower end and is configured to provide sea water suction to aid in a pig train being forced downwards through pipeline. The multiphase pump is configured to handle some amount of gas leaking around the pig train. A choke system may allow sea water to enter the flowline, thereby lowering the gas volume fraction (GVF) and preventing the GVF from exceeding the ability of the multiphase pump. For deeper water applications, a second pump may be provided in series that may be a single pump if positioned downstream of the multiphase pump.

System for dewatering a flowline including a multiphase pump connected at a lower end of the flowline

A system for recirculating a portion of a liquid fraction of multiphase production fluid to a pump for enhanced functionality thereof. The system includes a splitter assembly that obtains the multiphase production fluid from the pump. The splitter assembly utilizes multiple internal chambers to separate gas and liquid fractions of the fluid. A portion of the liquid fraction may then be recirculated back to the pump as indicated whereas the remainder of the liquid fraction may be recombined with the gas fraction for production.

Subsea splitter pump system

A subsea water injection pump includes components that are cooled and lubricated by the process fluid. The pump includes opposing stages of impellers in a 'back-to-back' arrangement such that the axial forces of the impeller stages partially or nearly fully offset each other. In some cases, a combination of barrier fluid and process fluid is used for lubrication and cooling.

Subsea process lubricated water injection pump

A method for determining flow rate of a multiphase fluid. The method includes measuring a first pressure differential () of the multiphase fluid flowing through a rotodynamic pump () operating at a rotational speed thereby driving the multiphase fluid, measuring a second pressure differential () of the multiphase fluid flowing through a portion () of a fluid conduit positioned in series with said rotodynamic pump, and determining, based on the first and second pressure differentials and the rotational speed of said rotodynamic pump, a flow rate of the multiphase fluid.

Determining flow rates of multiphase fluids

A subsea system is configured to inject seawater into a subterranean formation. The system includes a sub-micron filtration module and a plurality of pumps and a plurality of other filtering devices arranged in series.

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Rådal, Norway

Helge Dale