Subsea pump and system and methods for control
a pump system and subsea technology, applied in the direction of machines/engines, positive displacement liquid engines, borehole/well accessories, etc., can solve the problems of reducing affecting the reliability of the pump, and affecting the work efficiency of the pump, so as to reduce the speed of the subsea pump and improve the reliability. , the effect of increasing the speed
Inactive Publication Date: 2018-07-19
AKER SOLUTIONS AS +1
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AI Technical Summary
Benefits of technology
The present invention improves the reliability of subsea pumps, downhole pumps, and associated control methods. This is achieved by providing a subsea or downhole pump that can adjust its speed and voltage based on the variation in the gas volume fraction of the fluid being pumped. This control is done through a controller that reduces the pump speed when the measured pump current decreases and increases the pump speed when the measured pump current increases.
Problems solved by technology
The relationship between torque, power and speed can, however, be complex for various reasons, for example, that the fraction of the applied power that contributes to hydraulic (pumping) work varies.
Subsea pumps have a difficult location and restricted access for maintenance; reliability is therefore vital.
It is well known that operating pumps at feasible operating conditions will prolong service life.
Control is complex for subsea pumps receiving multiphase flow of variable gas volume fraction.
Method used
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Embodiment Construction
[0015]The present invention provides a subsea or downhole pump comprising an inlet and an outlet, where a multiphase fluid flow entering the inlet can have a variation in the gas volume fraction (GVF) of the fluid, the subsea or downhole pump being distinctive in that it includes or is operatively coupled to devices for normal pump control as the GVF varies, the devices consisting of:[0016]a transmitter for electric pump current;[0017]a transmitter for at least one of: pump speed, pump frequency, or pump voltage; and[0018]a controller acting to reduce the pump speed when the measured pump current decreases and to increase the pump speed when the measured pump current increases.
[0019]The devices for measuring the parameters electric current and measuring or using a set pump speed or frequency or pump voltage can, for example, be integrated into or coupled for real-time measurements at a topsides or onshore variable speed drive, thereby eliminating the requirement or use of subsea or ...
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A subsea or downhole pump includes an inlet and an outlet. A flow of a multiphase fluid entering the inlet can have a variation in a gas volume fraction (GVF). The subsea or downhole pump includes or is operatively coupled to control devices which provide for a control as the GVF varies. The control devices include a first transmitter for an electric pump current, a second transmitter for at least one of a pump speed, a pump frequency, and a pump voltage, and a controller. The controller reduces a speed of the subsea or downhole pump when a measured pump current decreases, and increases the speed of the subsea or downhole pump when the measured pump current increases.
Description
CROSS REFERENCE TO PRIOR APPLICATIONS[0001]This application is a U.S. National Phase application under 35 U.S.C. § 371 of International Application No. PCT / NO2016 / 050152, filed on Jul. 5, 2016 and which claims benefit to U.S. Provisional Patent Application No. 62 / 190,831, filed on Jul. 10, 2015, and to Norwegian Patent Application No. 20150973, filed on Jul. 27, 2015. The International Application was published in English on Jan. 19, 2017 as WO 2017 / 010891 A1 under PCT Article 21(2).FIELD[0002]The present invention relates to subsea pumping of a multiphase fluid. The present invention more specifically relates to a subsea or downhole pump and a subsea pump system comprising a subsea pump and a flow conditioning system operatively coupled to the subsea pump, and methods for control thereof.BACKGROUND[0003]Most subsea pumps are driven by a variable speed drive (a “VSD”), which is also termed a variable frequency drive (a “VFD”). A variable speed drive provides for a stepless variable ...
Claims
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IPC IPC(8): F04B49/20E21B43/12F04D13/08F04D15/00
CPCF04D31/00F04D15/0236F05D2270/335F04B49/20E21B43/121F04D13/086F04D15/0066F04D13/10F04B15/02F04B47/06F04B49/065E21B43/128F04B47/00F04D13/08H02P23/08H02P27/047
Inventor SLATER, ROBINHOMSTVEDT, GUNDERSANTOS, MARCELO
Owner AKER SOLUTIONS AS