Filter-switched drive operating mode control
First Claim
1. For use in a downhole production system, an electrical power system for providing three phase power without damage to the power system or downhole equipment comprising:
- a power source capable of selectively producing pulse width modulated three phase power for transmission over a cable into a borehole;
a filter capable of filtering the power produced by the power source prior to transmission over the cable; and
a controller capable of monitoring the filtered power and, responsive to detecting improper filtering of the power by the filter, either disabling transmission of power into the borehole by the power source or changing an operating mode of the power source.
2 Assignments
0 Petitions
Accused Products
Abstract
A controller for a pulse width modulated electrical drive or a dual-mode, pulse width modulated/variable voltage inverter drive is coupled to sensors within a filter at the drive output. Upon detecting failure of the filter or filter components (e.g., a capacitor short or blown fuse) through the sensors, the controller either shuts down the drive or automatically switches the drive operating mode to an output mode which does not require filtering. Damage to the electrical system or downhole equipment from transmission of unfiltered or improperly filtered power may thus be averted upon failure of the filter or a filter component.
9 Citations
20 Claims
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1. For use in a downhole production system, an electrical power system for providing three phase power without damage to the power system or downhole equipment comprising:
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a power source capable of selectively producing pulse width modulated three phase power for transmission over a cable into a borehole;
a filter capable of filtering the power produced by the power source prior to transmission over the cable; and
a controller capable of monitoring the filtered power and, responsive to detecting improper filtering of the power by the filter, either disabling transmission of power into the borehole by the power source or changing an operating mode of the power source. - View Dependent Claims (2, 3, 4, 5, 6)
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7. For use in a downhole production system, a filter-switched drive comprising:
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an electrical drive capable of selectively producing pulse width modulated three phase power; and
a controller for the drive adapted to receive sensor signals relating to operation of a filter coupled to an output of the drive, wherein the controller is configured to respond to improper filtering of power produced by the drive by either terminating transmission of power from the drive or changing an operating mode of the drive. - View Dependent Claims (8, 9, 10)
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11. A downhole production system comprising:
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a pump disposed within a borehole;
a motor physically coupled to the pump;
a three phase power cable electrically connecting the motor to a surface location;
a three phase power source;
an electric drive coupled between the power source and the cable, the electric drive converting power from the power source to pulse width modulated three phase power for transmission over the cable into the borehole;
a filter coupled between the electric drive and the cable, the filter the converted power output by the electric drive prior to transmission over the cable; and
a controller coupled to the electric drive and the filter and monitoring filtering by the filter of the converted power output by the electric drive, the controller, in response to detecting improper filtering of the converted power by the filter, changing an operating state of the electric drive. - View Dependent Claims (12, 13, 14, 15, 16, 18, 19, 20)
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17. A method of protecting production equipment within a borehole from damage comprising:
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filtering pulse width modulated three phase power prior to transmission into the borehole to eliminate voltage spikes and over-voltages;
monitoring the filtering of the power; and
responsive to detecting improper filtering of the power, either terminating transmission of three phase power into the borehole or switching an operating mode of an electric drive producing the power.
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Specification