A downhole oil pump for thick oil

Abstract

The utility model discloses a kind of downhole oil pumping unit for thick petroleum, stirring motor hollow shaft is located in the inside of motor shell, stator coil is arranged on the inner wall of motor shell, rotor coil is arranged on the outer wall of stirring motor hollow shaft, the position of stator coil and rotor coil corresponds;Spiral agitator is located in the inside of agitator fixed base, the upper end of agitator fixed base is fixedly connected with the lower end of stirring motor hollow shaft;Heating rod is fixed in the lower end of motor shell, and extends to the inside of agitator fixed base;The lower end of oil pumping unit is connected with the upper end of motor shell;Agitator fixed base, stirring motor hollow shaft and oil pumping unit are interconnected between each other.The utility model can improve the efficiency of thick petroleum extraction of oil pumping device and reduce equipment loss.

Description

Technical Field

[0001] This utility model relates to the field of downhole oil pumping operation technology, specifically to a downhole oil pump for viscous oil. Background Technology

[0002] Oil extraction is divided into rod-type and rodless extraction. Rod-type extraction uses piston-type pumping devices, while rodless extraction uses centrifugal or screw-type devices. However, regardless of the method, existing pumping devices are designed for oils with low viscosity. For oils with high viscosity, the extraction efficiency is low, and the equipment suffers from high wear and tear and a short lifespan. Therefore, there is an urgent need for a device that can effectively extract viscous oil. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the present invention aims to provide a downhole oil pump for viscous oil.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A downhole pump for viscous oil includes a spiral agitator, an agitator mounting base, an agitator motor, a heating rod, and a pump. The agitator motor includes a motor housing, a stator coil, a rotor coil, and a hollow shaft. The hollow shaft is located inside the motor housing, the stator coil is located on the inner wall of the motor housing, and the rotor coil is located on the outer wall of the hollow shaft. The stator coil and rotor coil are positioned correspondingly. The spiral agitator is located inside the agitator mounting base, and the upper end of the agitator mounting base is fixedly connected to the lower end of the hollow shaft. The heating rod is fixed to the lower end of the motor housing and extends into the interior of the agitator mounting base. The lower end of the pump is connected to the upper end of the motor housing. The agitator mounting base, the hollow shaft, and the pump are interconnected.

[0006] Furthermore, the aforementioned downhole pump also includes a base, the upper end of which is fixedly connected to the lower end of the motor housing, and the agitator mounting base is located inside the base, with the bottom of the agitator mounting base positioned higher than the bottom of the base.

[0007] Furthermore, the upper and lower ends of the motor housing are respectively provided with an upper flange and a lower flange, and the upper and lower ends of the motor housing are fixed to the oil pump and the base through the upper flange and the lower flange, respectively, and the heating rod is fixed to the lower flange.

[0008] Furthermore, the inner sides of both the upper and lower flanges are provided with bearing chambers, and the bearing chambers of the upper and lower flanges are respectively provided with an upper bearing and a lower bearing. The upper and lower ends of the hollow shaft of the stirring motor are respectively connected to the inner rings of the upper and lower bearings.

[0009] Furthermore, the heating rod is an electromagnetic induction heating rod.

[0010] The beneficial effects of this invention are as follows: Based on the traditional oil pumping device, this utility model adds a spiral stirrer and a heating rod. The hollow shaft of the stirring motor drives the spiral stirrer to rotate, so that the viscous oil is diluted by stirring and heating before entering the oil pumping device. The diluted oil can be more easily extracted by the oil pumping device, thereby improving the efficiency of the oil pumping device in extracting viscous oil and reducing equipment wear. Attached Figure Description

[0011] Figure 1 This is an overall cross-sectional view of the downhole oil pump in an embodiment of this utility model;

[0012] Figure 2 This is a partial cross-sectional view of an embodiment of the present invention;

[0013] Figure 3 This is a diagram showing the overall external structure of the downhole oil pump in this embodiment of the present invention. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0015] This embodiment provides a downhole pumping unit for viscous petroleum, such as... Figure 1-2 As shown, the system includes a spiral stirrer 1, a stirrer mounting base 2, a stirring motor, a heating rod 7, and an oil pump 13. The stirring motor includes a motor housing 9, a stator coil 8, a rotor coil, and a hollow shaft 3. The hollow shaft 3 is located inside the motor housing 9. The stator coil 8 is located on the inner wall of the motor housing 9, and the rotor coil is located on the outer wall of the hollow shaft 3. The stator coil and rotor coil are positioned correspondingly. The spiral stirrer 1 is located inside the stirrer mounting base 2, and the upper end of the stirrer mounting base 2 is fixedly connected to the lower end of the hollow shaft 3. The heating rod 7 is fixed to the lower end of the motor housing 9 and extends into the interior of the stirrer mounting base 2. The lower end of the oil pump 13 is connected to the upper end of the motor housing 9. The stirrer mounting base 2, the hollow shaft 3, and the oil pump 13 are interconnected.

[0016] When the aforementioned downhole pump is used to extract viscous oil, the entire downhole pump is inserted into the viscous oil. Power is connected, and the pump 13, stirring motor, and heating rod 7 are started. Under the action of the pump 13, the viscous oil enters from the lower end of the stirrer mounting base 2, passing sequentially through the stirrer mounting base 2, the hollow shaft 3 of the stirring motor, and the pump 13, thus being extracted. When the stator coil is energized, it generates a magnetic field. Under the influence of this magnetic field, the rotor coil generates an induced current, driving the hollow shaft 3 of the stirring motor to rotate axially. During rotation, the hollow shaft 3 drives the stirrer mounting base 2, along with its internal spiral stirrer 1, to rotate. As the viscous oil passes through the stirrer mounting base 2, the spiral stirrer 1 agitates it, while the heating rod 7 heats the oil, thus diluting it. The diluted oil then continues upward through the hollow shaft 3 of the stirring motor into the pump 13, where it is extracted.

[0017] In this embodiment, the downhole pump also includes a base 6, the upper end of which is fixedly connected to the lower end of the motor housing 9. The agitator mounting base 2 is located inside the base 6, and the bottom of the agitator mounting base 2 is higher than the bottom of the base 6. By providing the base 6, the downhole pump can be supported downhole during operation without affecting the rotation of the agitator mounting base 2.

[0018] In this embodiment, the upper end and the lower end of the motor housing 9 are respectively provided with an upper flange 10 and a lower flange 5. The upper end and the lower end of the motor housing 9 are fixed to the oil pump 13 and the base 6 through the upper flange 10 and the lower flange 5 respectively. The heating rod 7 is fixed to the lower flange 5.

[0019] Furthermore, in this embodiment, the inner sides of the upper flange 10 and the lower flange 5 are provided with bearing chambers, and the bearing chambers of the upper flange 10 and the lower flange 5 are respectively provided with an upper bearing 11 and a lower bearing 4. The upper end and the lower end of the hollow rotating shaft 3 of the stirring motor are respectively connected to the inner rings of the upper bearing 11 and the lower bearing 4.

[0020] In this embodiment, the heating rod 7 is an electromagnetic induction heating rod, which will not produce an open flame.

[0021] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.

Claims

1. A downhole pump for viscous oil, characterized in that, The system includes a spiral stirrer, a stirrer mounting base, a stirring motor, a heating rod, and an oil pump. The stirring motor comprises a motor housing, a stator coil, a rotor coil, and a hollow shaft. The hollow shaft is located inside the motor housing, the stator coil is mounted on the inner wall of the motor housing, and the rotor coil is mounted on the outer wall of the hollow shaft. The stator coil and rotor coil are positioned correspondingly. The spiral stirrer is located inside the stirrer mounting base, and the upper end of the stirrer mounting base is fixedly connected to the lower end of the hollow shaft. The heating rod is fixed to the lower end of the motor housing and extends into the interior of the stirrer mounting base. The lower end of the oil pump is connected to the upper end of the motor housing. The stirrer mounting base, the hollow shaft, and the oil pump are interconnected.

2. The downhole pump according to claim 1, characterized in that, It also includes a base, the upper end of which is fixedly connected to the lower end of the motor housing, and the stirrer mounting base is located inside the base, with the bottom of the stirrer mounting base being higher than the bottom of the base.

3. The downhole pump according to claim 1, characterized in that, The upper and lower ends of the motor housing are respectively provided with an upper flange and a lower flange. The upper and lower ends of the motor housing are fixed to the oil pump and the base through the upper flange and the lower flange, respectively. The heating rod is fixed to the lower flange.

4. The downhole pump according to claim 3, characterized in that, The upper flange and the lower flange are both provided with bearing chambers on their inner sides. The bearing chambers of the upper flange and the lower flange are respectively provided with an upper bearing and a lower bearing. The upper end and the lower end of the hollow shaft of the stirring motor are respectively connected to the inner rings of the upper bearing and the lower bearing.

5. The downhole pump according to claim 1, characterized in that, The heating rod is an electromagnetic induction heating rod.

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