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US 8,408,312 B2Granted
Compact cable suspended pumping system for dewatering gas wells
AssigneeZeitecs B.V.
InventorsLance I. Fielder, Christian Carstensen, Rik De Doncker, Helge Brauer, Holger Franz, Johannes Schmidt, Benjamin Eduard Wilkosz
Life of this patent
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Abstract
A method of unloading liquid from a reservoir includes deploying a pumping system into a wellbore to a location proximate the reservoir using a cable. The pumping system includes a multi-section motor, an isolation device, and a pump. The method further includes supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir.
Claims23
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir;
- and
- setting the isolation device before or as a result of supplying the power signal, thereby rotationally connecting the pumping system to a tubular string disposed in the wellbore and isolating an inlet of the pump from an outlet of the pump.
1 more element
A pumping system, comprising:
- a submersible multi-section electric motor operable to rotate a drive shaft, wherein each section is incrementally oriented so that the sections are operable to mimic a multi-phase motor;
- a pump rotationally connected to the drive shaft;
- an isolation device operable to engage a tubular string, thereby fluidly isolating an inlet of the pump from an outlet of the pump and rotationally connecting the motor and the pump to the tubular string;
- and
- a cable having two or less conductors, a strength sufficient to support the motor, the pump, and the isolation device, and in electrical communication with the motor.
2 more elements
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir;
- ceasing supply of the power signal;
- unsetting the isolation device after or as a result of ceasing the power signal supply;
- and
- removing the pumping system from the wellbore using the cable.
3 more elements
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- and
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir,
- wherein:
- the power signal is medium voltage DC via the cable,
- the pumping assembly further comprises a power conversion module (PCM), and
- the PCM outputs a low voltage signal to the motor.
4 more elements
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- and
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir,
- wherein motor and the pump are operated at greater than or equal to ten thousand RPM.
1 more element
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- and
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir,
- wherein:
- the pumping system comprises a sensor, and
- the method further comprises transmitting a measurement by the sensor to the surface via the cable.
3 more elements
A method of unloading liquid from a reservoir, comprising:
- deploying a pumping system into a wellbore to a location proximate the reservoir using a cable, wherein the pumping system comprises a multi-section motor, an isolation device, and a pump;
- and
- supplying a power signal from the surface to the motor via the cable and sequentially operating each section of the motor to mimic a multi-phase motor, thereby driving the pump and lowering a liquid level in the tubular string to a level proximate the reservoir,
- wherein the isolation device longitudinally connects the pumping system to the tubular string, thereby supporting a weight of the pumping system.
1 more element
Dependencies are inferred from the claim text.