SUBMERSIBLE PUMPING SYSTEMS AND METHODS FOR DEEP WELL APPLICATIONS
First Claim
1. A submersible pumping system for a well, comprising:
- a power supply;
a power converter coupled to the power supply; and
a subsurface unit coupled to the power converter and configured to be positioned in the well remote from the power supply and the power converter, wherein the subsurface unit includes a pump portion and a motor operably coupled to the pump portion, and a subsurface controller, the subsurface controller further comprising;
a power compensation circuit operable to receive electrical power from the power converter configured to reduce at least one of a reactance introduced by the motor and reactive and resistive effects introduced by electrical leads coupling the power converter to the subsurface unit;
a motor controller coupled to the power compensation circuit that is configured to convert electrical power received from the power compensation circuit to polyphase electrical power that is communicated to the motor; and
a motor speed controller configured to control a rotational speed of the motor when the polyphase electrical power is first applied to the motor.
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Accused Products
Abstract
Submersible pumping systems, devices and methods for extracting liquids in deep well applications are disclosed. In the various embodiments, a submersible pumping system includes a power supply and a power converter coupled to the power supply. A subsurface unit may be coupled to the power converter and positioned in the well. The subsurface unit may include a subsurface controller, a motor and a pump portion operably coupled to the subsurface controller. The pump portion may further include a front shroud having an inlet, and a back shroud sealably coupled to the front shroud to define a volume. An orifice fluidly communicates with the volume and an annular fluid discharge space disposed about the subsurface unit. An impeller operably coupled to the motor and positioned within the volume may transport a liquid from the inlet to the annular fluid discharge space.
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Citations
27 Claims
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1. A submersible pumping system for a well, comprising:
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a power supply; a power converter coupled to the power supply; and a subsurface unit coupled to the power converter and configured to be positioned in the well remote from the power supply and the power converter, wherein the subsurface unit includes a pump portion and a motor operably coupled to the pump portion, and a subsurface controller, the subsurface controller further comprising; a power compensation circuit operable to receive electrical power from the power converter configured to reduce at least one of a reactance introduced by the motor and reactive and resistive effects introduced by electrical leads coupling the power converter to the subsurface unit; a motor controller coupled to the power compensation circuit that is configured to convert electrical power received from the power compensation circuit to polyphase electrical power that is communicated to the motor; and a motor speed controller configured to control a rotational speed of the motor when the polyphase electrical power is first applied to the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A submersible pumping system for a well, comprising:
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a power supply; a feedback system coupled to the power supply; and a subsurface unit coupled to the feedback system and configured to be positioned in the well remote from the power supply and the feedback system, wherein the subsurface unit includes at least a pump portion and a motor operably coupled to the pump portion, the pump portion being operable to transport a volume of a liquid from the well to a flow meter, the feedback system further comprising; a control mode unit configured to implement a predetermined control mode; a power converter coupled to the control mode unit that is configured to receive electrical power from the power supply, and to controllably provide electrical power to the subsurface unit based upon an out/put from the control mode unit; and a comparator that receives a feedback signal from the flow meter that provides an error signal to the control mode unit based upon a comparison of the feedback signal and a desired flow value. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of removing a liquid from a well, comprising:
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positioning a subsurface unit into a well, the subsurface unit including at least a pump portion coupled to a motor configured to impart a rotational motion to the pump portion; coupling the subsurface unit to a power supply and a power converter configured to controllably provide electrical power to the subsurface unit; and starting the motor using a selected motor speed distribution. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method of removing a liquid from a well, comprising:
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positioning a subsurface unit into a well, the subsurface unit including at least a pump portion and a motor coupled to the pump portion, the subsurface unit being configured to transport a liquid from the well to a surface location; coupling the subsurface unit to a power supply and a feedback system configured to controllably provide electrical power to the subsurface unit; selecting a desired flow rate to be delivered by the subsurface unit; setting a speed for the motor that delivers the desired flow rate; measuring a delivered flow rate; and if the delivered flow rate differs from the desired flow rate, then correcting the speed to attain the desired flow rate.
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Specification