Electrical System and Method for Selective Control of Downhole Devices
AssigneeHalliburton Energy Services, Inc.
InventorIbrahim El Mallawany
Life of this patent
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Abstract
A method of actuating a selected electrically powered device such as a solenoid operated valve (SOV) among a plurality of electrically powered devices coupled between a first conductor and second conductor includes applying a high voltage differential between the first conductor and the second conductor, the high voltage being at least as high as the breakover voltage of a switching thyristor coupled to the selected electrically powered devices. The method also includes applying a low voltage differential between the first conductor and the second conductor after applying the high voltage, the low voltage being lower than the breakover voltage of any switching thyristor coupled to the plurality of electrically powered devices.
Claims20
An electrical system for selective control of downhole devices, comprising:
- a first conductor;
- a second conductor;
- a first electrically powered downhole device coupled between the first conductor and the second conductor
- a first switching thyristor coupled between the first conductor and the second conductor in series with the first electrically powered downhole device;
- and
- a first voltage delay device coupled to the first switching thyristor and configured to prevent a voltage from being applied to the first switching thyristor for a first time period.
A method of selectively controlling a plurality of valves, comprising:
- applying a voltage to an electrical valve control system, the electrical valve control system comprising a plurality of electrically powered devices, each electrically powered device coupled to a switching thyristor, and each switching thyristor coupled to a voltage delay device;
- delaying transmission of the voltage to a selected electrically powered device from the plurality of electrically powered devices for a set voltage delay duration, the set voltage delay duration provided by the voltage delay device coupled to the switching thyristor that is coupled to the selected electrically powered device;
- actuating the selected electrically powered device after the set voltage delay duration;
- and
- reducing the voltage after actuation of the selected electrically powered device.
A method of actuating a selected electrically powered device among a plurality of electrically powered devices coupled between a first conductor and second conductor, comprising:
- applying a high voltage differential between the first conductor and the second conductor, the high voltage being at least as high as the breakover voltage of a switching thyristor coupled to the selected electrically powered device;
- and
- applying a low voltage differential between the first conductor and the second conductor after applying the high voltage, the low voltage being lower than the breakover voltage of any switching thyristor coupled to the plurality of electrically powered devices.
Dependencies are inferred from the claim text.