US20130255933A1 - Oil pumping system using a switched reluctance motor to drive a screw pump - Google Patents

Oil pumping system using a switched reluctance motor to drive a screw pump Download PDF

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Publication number
US20130255933A1
US20130255933A1 US13/437,966 US201213437966A US2013255933A1 US 20130255933 A1 US20130255933 A1 US 20130255933A1 US 201213437966 A US201213437966 A US 201213437966A US 2013255933 A1 US2013255933 A1 US 2013255933A1
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United States
Prior art keywords
pumping
stator
switched reluctance
reluctance motor
rotor
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/437,966
Inventor
Kuei-Hsien Shen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WONG YEN-HONG
Original Assignee
Kuei-Hsien Shen
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Filing date
Publication date
Application filed by Kuei-Hsien Shen filed Critical Kuei-Hsien Shen
Priority to US13/437,966 priority Critical patent/US20130255933A1/en
Publication of US20130255933A1 publication Critical patent/US20130255933A1/en
Assigned to WONG, YEN-HONG reassignment WONG, YEN-HONG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHEN, KUEI-HSIEN
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/008—Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions

Definitions

  • the present invention relates to oil production technology and more particularly, to an oil pumping system for the production of crude oil by using a switched reluctance motor to drive a screw pump.
  • An indirect type motor drive uses a motor to rotate a reduction gear box through a transmission belt, thereby driving an oil pump to pump crude oil.
  • This indirect type motor drive has numerous drawbacks.
  • the transmission of the transmission belt and the reduction gear box consumes much power, or about 20% of totally consumed power. Further, the transmission belt and the reduction gear box wear quickly with use, and the components thereof must be regularly examined and replaced.
  • a direct type motor drive uses a permanent magnet motor to drive an oil pump directly. Due to direct driving, less power is consumed.
  • a permanent magnet motor may fail under a high temperature environment. Further, the output torque of a permanent magnet motor is limited.
  • the present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide an oil pumping system, which uses a switched reluctance motor to drive a screw pump, facilitating speed control, reducing power consumption, achieving the effects of high torque, low starting current and non-wearing, and avoiding demagnetization failure.
  • an oil pumping system comprises a pumping-well unit, a controller, a switched reluctance motor mounted at the pumping-well unit and electrically coupled to the controller, a casing connected to the pumping-well unit, an oil suction pipe mounted in the casing, a pumping rod disposed in the oil suction pipe and connected to the switched reluctance motor, and a screw pump connected to the pumping rod in the oil suction pipe.
  • the controller comprises a main control circuit, a power converter, a current sensor and a position sensor. The position sensor and the current sensor are adapted to detect power on/off status of each winding pole of the stator.
  • the main control circuit receives and analyzes sensing signals indicative of power on/off status of the winding poles of the stator provided by the position sensor and the current sensor, and provides a corresponding control signal to power on/off the winding poles of the stator.
  • the power converter converts the control signal provided by the main control circuit into a power signal for driving the switched reluctance motor.
  • FIG. 1 is a schematic drawing illustrating an oil pumping system in accordance with the present invention.
  • FIG. 2 is a system block diagram of the oil pumping system in accordance with the present invention.
  • FIG. 3 is a cross sectional view of the switched reluctance motor, illustrating pole B of motor stator conducted and pole A powered off.
  • FIG. 4 is a cross sectional view of the switched reluctance motor, illustrating pole C of motor stator conducted and pole B powered off.
  • FIG. 5 is a cross sectional view of the switched reluctance motor, illustrating pole D of motor stator conducted and pole C powered off.
  • FIG. 6 is a cross sectional view of the switched reluctance motor, illustrating pole A of motor stator conducted and pole D powered off.
  • an oil pumping system in accordance with the present invention is shown comprising a pumping-well unit 30 , a switched reluctance motor 20 mounted at the top side of the pumping-well unit 30 and electrically coupled to a controller 10 , a casing 11 connected to the bottom side of the pumping-well unit 30 , an oil suction pipe 12 mounted in the casing 11 , a pumping rod 13 disposed in the oil suction pipe 12 and connected to the switched reluctance motor 20 , and a screw pump 14 connected to the bottom end of the pumping rod 13 in the oil suction pipe 12 .
  • the switched reluctance motor 20 comprises a shaft 21 connected to the pumping rod 13 and the screw pump 14 in the oil suction pipe 12 , a stator 22 , a rotor 23 fixedly mounted at the shaft 21 and surrounded by the stator 22 .
  • the stator 22 comprises a plurality of winding poles (A,A′), (B,B′), (C,C′) and (D,D′) for generating a magnetic attractive force when electrically conducted.
  • the rotor 23 comprises a plurality of rotor teeth (E,E′), (F,F′) and (G,G′).
  • the controller 10 comprises a main control circuit, a power converter, a current sensor, a position sensor.
  • the position sensor and the current sensor can detect the power on/off status of each winding pole of the stator 22 of the switched reluctance motor 20 .
  • the main control circuit receives and analyzes sensing signals (indicative of power on/off status of the winding poles of the stator) provided by the position sensor and the current sensor, and provides a corresponding control signal to conduct or to cut off power supply from the winding poles of the stator 22 .
  • the power converter converts the control signal provided by the main control circuit into a power signal for driving the switched reluctance motor 20 .
  • the controller controls the winding poles (B,B′) of the stator 22 to be electrically conducted to generate a magnetic attractive force (magnetic line of force always seeks the shortest path of least resistance) to attract the rotor teeth (F,F′) of the rotor 23 .
  • the controller 10 controls the winding poles (A,A′) of the stator 22 to be off, and therefore, the rotor teeth (E,E′) of the rotor 23 are not attracted, allowing the rotor teeth (F,F′) of the rotor 23 to be attracted in shifting the phase of the rotor 23 .
  • the controller electrically conducts the winding poles (C,C′) of the stator 22 to attract the rotor teeth (G,G′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (B,B′) of the stator 22 to release the rotor teeth (F,F′) of the rotor 23 , and therefore the rotor 23 is rotated further. Thereafter, as shown in FIG.
  • the controller electrically conducts the winding poles (D,D′) of the stator 22 to attract the rotor teeth (E,E′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (C,C′) of the stator 22 to release the rotor teeth (G,G′) of the rotor 23 , and therefore the rotor 23 is rotated further. Thereafter, as shown in FIG.
  • the controller electrically conducts the winding poles (A,A′) of the stator 22 to attract the rotor teeth (F,F′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (D,D′) of the stator 22 to release the rotor teeth (E,E′) of the rotor 23 .
  • the aforesaid procedure is repeated again and again, causing the rotor 23 to continuously rotate the shaft 21 and the screw pump 14 in pumping crude oil into an oil delivery pipe 31 for output.
  • the invention achieves the advantages of: (1) speed control is conveniently achieved by means of changing the power on/off frequency of the winding poles of the stator; (2) when going to stop the system, controls the magnetic attractive force to attract the rotor, and the rotor is stopped accurately, i.e., the invention achieves accurate and stable braking effects; (3) by means of magnetic attractive force to rotate the rotor, a high torque is achieved, and therefore the invention achieves the effects of high torque, low starting current and non-wearing; (4) the switched reluctance motor of the invention eliminates the use of rare earth magnetic steel, saving the cost and avoiding rare earth demagnetization failure; (5) the direct drive design of the invention eliminates the power consumption drawback of a belt or gear transmission design.

Abstract

An oil-pumping system includes a pumping-well unit, a controller composed of a main control circuit, a power converter, a current sensor and a position sensor, a switched reluctance motor mounted at the pumping-well unit and electrically coupled to the controller, a casing connected to the pumping-well unit, an oil suction pipe mounted in the casing, a pumping rod disposed in the oil suction pipe and connected to the switched reluctance motor, and a screw pump connected to the pumping rod in the oil suction pipe.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to oil production technology and more particularly, to an oil pumping system for the production of crude oil by using a switched reluctance motor to drive a screw pump.
  • 2. Description of the Related Art
  • Conventionally, two different types of motor drives, namely, the indirect drive type and the direct drive type, are selectively used for the production of crude oil. An indirect type motor drive uses a motor to rotate a reduction gear box through a transmission belt, thereby driving an oil pump to pump crude oil. This indirect type motor drive has numerous drawbacks. The transmission of the transmission belt and the reduction gear box consumes much power, or about 20% of totally consumed power. Further, the transmission belt and the reduction gear box wear quickly with use, and the components thereof must be regularly examined and replaced. A direct type motor drive uses a permanent magnet motor to drive an oil pump directly. Due to direct driving, less power is consumed. However, as the production of a permanent magnet motor uses rare earth magnetic steel, its manufacturing cost is high. Further, a permanent magnet motor may fail under a high temperature environment. Further, the output torque of a permanent magnet motor is limited.
    • SUMMARY OF THE INVENTION
  • The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide an oil pumping system, which uses a switched reluctance motor to drive a screw pump, facilitating speed control, reducing power consumption, achieving the effects of high torque, low starting current and non-wearing, and avoiding demagnetization failure.
  • To achieve this and other objects of the present invention, an oil pumping system comprises a pumping-well unit, a controller, a switched reluctance motor mounted at the pumping-well unit and electrically coupled to the controller, a casing connected to the pumping-well unit, an oil suction pipe mounted in the casing, a pumping rod disposed in the oil suction pipe and connected to the switched reluctance motor, and a screw pump connected to the pumping rod in the oil suction pipe. The controller comprises a main control circuit, a power converter, a current sensor and a position sensor. The position sensor and the current sensor are adapted to detect power on/off status of each winding pole of the stator. The main control circuit receives and analyzes sensing signals indicative of power on/off status of the winding poles of the stator provided by the position sensor and the current sensor, and provides a corresponding control signal to power on/off the winding poles of the stator. The power converter converts the control signal provided by the main control circuit into a power signal for driving the switched reluctance motor.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic drawing illustrating an oil pumping system in accordance with the present invention.
  • FIG. 2 is a system block diagram of the oil pumping system in accordance with the present invention.
  • FIG. 3 is a cross sectional view of the switched reluctance motor, illustrating pole B of motor stator conducted and pole A powered off.
  • FIG. 4 is a cross sectional view of the switched reluctance motor, illustrating pole C of motor stator conducted and pole B powered off.
  • FIG. 5 is a cross sectional view of the switched reluctance motor, illustrating pole D of motor stator conducted and pole C powered off.
  • FIG. 6 is a cross sectional view of the switched reluctance motor, illustrating pole A of motor stator conducted and pole D powered off.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Referring to FIGS. 1-6, an oil pumping system in accordance with the present invention is shown comprising a pumping-well unit 30, a switched reluctance motor 20 mounted at the top side of the pumping-well unit 30 and electrically coupled to a controller 10, a casing 11 connected to the bottom side of the pumping-well unit 30, an oil suction pipe 12 mounted in the casing 11, a pumping rod 13 disposed in the oil suction pipe 12 and connected to the switched reluctance motor 20, and a screw pump 14 connected to the bottom end of the pumping rod 13 in the oil suction pipe 12. The switched reluctance motor 20 comprises a shaft 21 connected to the pumping rod 13 and the screw pump 14 in the oil suction pipe 12, a stator 22, a rotor 23 fixedly mounted at the shaft 21 and surrounded by the stator 22. The stator 22 comprises a plurality of winding poles (A,A′), (B,B′), (C,C′) and (D,D′) for generating a magnetic attractive force when electrically conducted. The rotor 23 comprises a plurality of rotor teeth (E,E′), (F,F′) and (G,G′). When the winding poles of the stator 22 are electrically conducted, a magnetic attractive force is produced to attract the rotor teeth of the rotor 23, causing the position of the rotor teeth to be shifted. The controller 10 comprises a main control circuit, a power converter, a current sensor, a position sensor. The position sensor and the current sensor can detect the power on/off status of each winding pole of the stator 22 of the switched reluctance motor 20. The main control circuit receives and analyzes sensing signals (indicative of power on/off status of the winding poles of the stator) provided by the position sensor and the current sensor, and provides a corresponding control signal to conduct or to cut off power supply from the winding poles of the stator 22. The power converter converts the control signal provided by the main control circuit into a power signal for driving the switched reluctance motor 20.
  • The operation and effects of the present invention are outlined hereinafter with reference to FIGS. 3, 4, 5 and 6. As illustrated in FIG. 3, the controller controls the winding poles (B,B′) of the stator 22 to be electrically conducted to generate a magnetic attractive force (magnetic line of force always seeks the shortest path of least resistance) to attract the rotor teeth (F,F′) of the rotor 23. At this time, the winding poles (A,A′) of the stator 22 are kept in line with the rotor teeth (E,E′) of the rotor 23; the controller 10 controls the winding poles (A,A′) of the stator 22 to be off, and therefore, the rotor teeth (E,E′) of the rotor 23 are not attracted, allowing the rotor teeth (F,F′) of the rotor 23 to be attracted in shifting the phase of the rotor 23. Thereafter, as shown in FIG. 4, the controller electrically conducts the winding poles (C,C′) of the stator 22 to attract the rotor teeth (G,G′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (B,B′) of the stator 22 to release the rotor teeth (F,F′) of the rotor 23, and therefore the rotor 23 is rotated further. Thereafter, as shown in FIG. 5, the controller electrically conducts the winding poles (D,D′) of the stator 22 to attract the rotor teeth (E,E′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (C,C′) of the stator 22 to release the rotor teeth (G,G′) of the rotor 23, and therefore the rotor 23 is rotated further. Thereafter, as shown in FIG. 6, the controller electrically conducts the winding poles (A,A′) of the stator 22 to attract the rotor teeth (F,F′) of the rotor 23 and simultaneously electrically cuts off power supply from the winding poles (D,D′) of the stator 22 to release the rotor teeth (E,E′) of the rotor 23. The aforesaid procedure is repeated again and again, causing the rotor 23 to continuously rotate the shaft 21 and the screw pump 14 in pumping crude oil into an oil delivery pipe 31 for output.
  • As stated above, by means of switched reluctance drive to rotate the rotor 23, the invention achieves the advantages of: (1) speed control is conveniently achieved by means of changing the power on/off frequency of the winding poles of the stator; (2) when going to stop the system, controls the magnetic attractive force to attract the rotor, and the rotor is stopped accurately, i.e., the invention achieves accurate and stable braking effects; (3) by means of magnetic attractive force to rotate the rotor, a high torque is achieved, and therefore the invention achieves the effects of high torque, low starting current and non-wearing; (4) the switched reluctance motor of the invention eliminates the use of rare earth magnetic steel, saving the cost and avoiding rare earth demagnetization failure; (5) the direct drive design of the invention eliminates the power consumption drawback of a belt or gear transmission design.
  • Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.

Claims (1)

What the invention claimed is:
1. An oil-pumping system, comprising:
a pumping-well unit, a controller, a switched reluctance motor mounted at a top side of said pumping-well unit and electrically coupled to said controller, a casing connected to a bottom side of said pumping-well unit, an oil suction pipe mounted in said casing, a pumping rod disposed in said oil suction pipe and connected to said switched reluctance motor, and a screw pump connected to a bottom end of said pumping rod in said oil suction pipe, said switched reluctance motor comprising a shaft connected to said pumping rod in said oil suction pipe, a stator, a rotor fixedly mounted at said shaft and surrounded by said stator, said stator comprising a plurality of winding poles respectively electrically conductable for generating a magnetic attractive force subject to the control of said controller, said rotor comprising a plurality of rotor teeth attractable by the magnetic attractive force generated by said winding poles, said controller comprising a main control circuit, a power converter, a current sensor and a position sensor, said position sensor and said current sensor being adapted to detect power on/off status of each said winding pole of said stator of said switched reluctance motor, said main control circuit receiving and analyzing sensing signals indicative of power on/off status of said winding poles of said stator provided by said position sensor and said current sensor and providing a corresponding control signal to power on/off said winding poles of said stator, said power converter converting the control signal provided by said main control circuit into a power signal for driving said switched reluctance motor.
US13/437,966 2012-04-03 2012-04-03 Oil pumping system using a switched reluctance motor to drive a screw pump Abandoned US20130255933A1 (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150362035A1 (en) * 2014-06-17 2015-12-17 Yen-Hong Wong Hydraulic auxiliary brake device of motor used for oil production
CN105401925A (en) * 2015-11-30 2016-03-16 中国石油天然气股份有限公司 Shaft-bottom throttling device and shaft-bottom throttling method of gas store
CN105822522A (en) * 2016-04-27 2016-08-03 成都绿迪科技有限公司 Oil well pump for oil exploitation
CN106062305A (en) * 2014-02-19 2016-10-26 耐驰泵及系统有限公司 Pump system for pumping viscous or partially viscous media out of a borehole
US9896912B2 (en) 2015-05-13 2018-02-20 Baker Hughes, A Ge Company, Llc Active rectifier for downhole applications
US10196921B2 (en) 2016-06-20 2019-02-05 Baker Hughes, A Ge Company, Llc Modular downhole generator
US20200144950A1 (en) * 2017-12-28 2020-05-07 Software Motor Corporation Low-noise, high rotor pole switched reluctance motor
CN111379556A (en) * 2018-12-27 2020-07-07 中国石油天然气股份有限公司 Method and device for judging fault type of screw pump well
WO2020177349A1 (en) * 2019-03-06 2020-09-10 无锡恒信北石科技有限公司 Intelligent oil extraction system using all-metal screw pump
US10968726B2 (en) * 2017-01-25 2021-04-06 Alkhorayef Petroleum Company Limited Systems and methods of power transmission for downhole applications
RU2783156C1 (en) * 2019-03-06 2022-11-09 Уси Хэнсинь Бейши Текнолоджи Ко., Лтд Smart petroleum production system with an all-metal screw pump

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US7314349B2 (en) * 2004-04-26 2008-01-01 Djax Corporation Fluid level control system for progressive cavity pump
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US7534096B2 (en) * 2004-06-18 2009-05-19 Unico, Inc. Method and system for improving pump efficiency and productivity under power disturbance conditions
US20100206554A1 (en) * 2007-05-04 2010-08-19 Dynamic Dinosaurs B.V. Power transmission system for use with downhole equipment
US7880418B2 (en) * 2005-10-12 2011-02-01 Moteurs Leroy-Somer Electromechanical drive system, in particular for progressive cavity pumps for oil wells

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US5637974A (en) * 1995-04-21 1997-06-10 Itt Automotive Electrical Systems, Inc. Method and apparatus for hybrid direct-indirect control of a switched reluctance motor
US5820350A (en) * 1995-11-17 1998-10-13 Highland/Corod, Inc. Method and apparatus for controlling downhole rotary pump used in production of oil wells
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106062305A (en) * 2014-02-19 2016-10-26 耐驰泵及系统有限公司 Pump system for pumping viscous or partially viscous media out of a borehole
US20150362035A1 (en) * 2014-06-17 2015-12-17 Yen-Hong Wong Hydraulic auxiliary brake device of motor used for oil production
US9441683B2 (en) * 2014-06-17 2016-09-13 Yen-Hong Wong Hydraulic auxiliary brake device of motor used for oil production
US9896912B2 (en) 2015-05-13 2018-02-20 Baker Hughes, A Ge Company, Llc Active rectifier for downhole applications
CN105401925A (en) * 2015-11-30 2016-03-16 中国石油天然气股份有限公司 Shaft-bottom throttling device and shaft-bottom throttling method of gas store
CN105822522A (en) * 2016-04-27 2016-08-03 成都绿迪科技有限公司 Oil well pump for oil exploitation
US10196921B2 (en) 2016-06-20 2019-02-05 Baker Hughes, A Ge Company, Llc Modular downhole generator
US11035205B2 (en) 2016-06-20 2021-06-15 Baker Hughes, A Ge Company, Llc Modular downhole generator
US10968726B2 (en) * 2017-01-25 2021-04-06 Alkhorayef Petroleum Company Limited Systems and methods of power transmission for downhole applications
US20200144950A1 (en) * 2017-12-28 2020-05-07 Software Motor Corporation Low-noise, high rotor pole switched reluctance motor
US10707798B2 (en) * 2017-12-28 2020-07-07 Software Motor Company Low-noise, high rotor pole switched reluctance motor
CN111379556A (en) * 2018-12-27 2020-07-07 中国石油天然气股份有限公司 Method and device for judging fault type of screw pump well
WO2020177349A1 (en) * 2019-03-06 2020-09-10 无锡恒信北石科技有限公司 Intelligent oil extraction system using all-metal screw pump
RU2783156C1 (en) * 2019-03-06 2022-11-09 Уси Хэнсинь Бейши Текнолоджи Ко., Лтд Smart petroleum production system with an all-metal screw pump

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