Pumps – Motor driven – Electric or magnetic motor
Patent
1998-12-11
2000-10-24
Walberg, Teresa
Pumps
Motor driven
Electric or magnetic motor
41742315, F04B 1700
Patent
active
061357324
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to production of oil and other formation fluids, and can be employed in submersible electric pumping.
BACKGROUND OF THE INVENTION
Known in the art is a submersible pump assembly comprising an electric motor having an electromechanical transducer shaft connected to a pump shaft, and a frequency converter electrically coupled to the electric motor (PCT, A1, WO 91/19905).
In this assembly, the converter is arranged in the area of the electric motor mount and is suitable for location with the submersible pump assembly directly in the well.
The problem with the pump assembly above is that a three-conductor cable should be used to supply power to the electric motor and the frequency converter. It makes the assembly less reliable and raises its operating cost, in particular, when the submersible pump assembly operates in the wells at large depths.
A well pumping system disclosed in Maximov V. P. "Adjustable Control of Submersible Pump System Drive", Moscow, 1981, pages 5,6, comprises a pump with an electric motor, each having its body suitable for location in a well using a tubing, and a frequency converter electrically coupled by a cable to the electric motor, the frequency converter including a rectifier and an inverter.
In this pump system, the frequency converter is located at the daylight surface in the vicinity of the well mouth and is connected by a multicore cable to the electric motor. In this case, voltage is also delivered to the electric motor by a three-conductor cable whose insulation has to meet stringent requirements. This raises the operating costs since the cable conductors are made of copper in order to provide the adequate electric connection, and failure of the insulation between the conductors may cause the risk of the system damage.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a well pumping equipment wherein the frequency converter design and connection to the electric motor permits the employment of a single-conductor cable to supply power to the submersible pump, ensuring thereby the reduction in the amount of metal per structure and making the equipment more cost effective and reliable.
The aforementioned object is attained by a well pumping equipment comprising a pump with an electric motor, each having its body suitable for location in the well using a tubing, a frequency converter electrically coupled by a cable to the electric motor and including a rectifier and inverter, wherein in accordance with the invention the inverter is adapted to be located in the well, an input bus of the inverter being connected to a first output bus of the rectifier by a single-conductor cable, while the other singleconductor connection line to supply power to the electric motor and the inverter is the electric connection of the motor and inverter bodies with the tubing which is electrically coupled to a second output bus of the rectifier.
The above features and advantages of the present invention will be apparent from the following description of its best embodiment, token in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic view of a well pumping equipment of the present invention.
DESCRIPTION OF THE BEST EMBODIMENT OF THE INVENTION
Referring to FIG. 1, a well pumping equipment comprises a pump 1 with an electric motor 2, each having its body suitable for location in a well using a tubing 3, a frequency converter 4 electrically coupled to the electric motor 2 by a cable 5 and including a rectifier 6 and an inverter 7. In accordance with the invention, the inverter 7 is adapted to be located in the well and is coupled to a first output bus of the rectifier 6 by a single-conductor cable 5, while the other single-conductor connection line to supply power to the electric motor 2 and to the inverter 7 is the electric connection from the electric motor 2 and inverter 7 bodies to the tubing 3 which is electrically coupled to a second output bus of the rectifier 6.
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REFERENCES:
patent: 4928771 (1990-05-01), Vandevier
Campbell Thor
Otkrytoe Aktsionernoe Obschestvo "Almetevski Nasosnyi Zavod"
Walberg Teresa
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