Flow guide cover for electric submersible pump

Abstract

The utility model relates to a flow guide cover for an electric submersible pump, which comprises a flow guide pipe and a butt flange, the flow guide pipe is a cylinder with an upper opening and a lower opening, and the upper part of the flow guide pipe is provided with a pair of connecting holes; a jackscrew inserting hole is formed in the side wall of the upper half flange of the butt flange, and a jackscrew is arranged in the jackscrew inserting hole in a matched mode. The diameter of the upper half butt flange is larger than that of the lower half butt flange, and the upper half butt flange and the lower half butt flange are in a step shape. The flow guide pipe is connected to the lower half flange of the butt joint flange in a sleeving mode, and the top of the flow guide pipe abuts against the bottom face of the upper half flange of the butt joint flange. The side wall of the lower half flange of the butt flange is provided with paired connecting pipes, each connecting pipe is provided with a connecting block in a matched mode, and meanwhile the connecting blocks are matched with the connecting holes. The oil pumping unit improves heat dissipation efficiency, prevents air locking, prolongs the service life of the unit, improves oil pumping efficiency, and is wide in application range, convenient to install, easy to disassemble and high in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of electric submersible pumps, in particular to a flow guide cover for an electric submersible pump. Background Art

[0002] An electric submersible pump is a multistage centrifugal pump that works underground. The centrifugal pump and the submersible oil motor are lowered into the well through an oil pipe. The ground power supply transmits electrical energy to the underground submersible oil motor through a transformer, a control panel and a submersible oil cable, so that the motor drives the multistage centrifugal pump to rotate, converting electrical energy into mechanical energy, thereby lifting the well fluid in the oil well to the ground. In the production of oilfields during the high water cut period, most of the crude oil is produced by electric submersible pumps.

[0003] The working principle of an electric submersible pump is to drive the water pump to work through the rotational force generated by the motor. Specifically, the rotational force generated by the motor is transmitted to the impeller of the water pump through the shaft, causing it to generate centrifugal force. When the impeller rotates, the liquid is sucked into the center of the impeller and discharged from the outlet of the impeller under the action of centrifugal force, thereby realizing the pumping and discharging of the liquid.

[0004] Electric submersible pumps are mainly used to pump liquids from water sources such as wells, rivers, and ponds, and are widely used in fields such as agriculture, industry, and domestic water use. Their advantages include: 1. Small size and light weight: Compact structure, suitable for narrow spaces, and easy to install and maintain. 2. High working efficiency: Can efficiently pump liquids from underground or discharge them to specific locations. 3. Low usage cost: Maintenance-free and long service life, reducing the usage cost.

[0005] The electric submersible pump separator is a key component in the electric submersible centrifugal pump (referred to as an electric submersible pump for short) system. Its main function is to separate the liquid in the well (including oil-containing water, impurities, and scattered particles) to improve the utilization rate of oil liquid and reduce production costs.

[0006] When a traditional electric submersible pump is used, it is connected to a separator to pump liquid underground. The technical problems are: 1. The suction force of the electric submersible pump directly extending into the well is too small, and the suction efficiency is low; 2. It is easy to generate an air lock phenomenon; 3. The heat dissipation efficiency is poor; 4. The service life of the unit is short.

[0007] Therefore, a flow guide cover for an electric submersible pump is designed to solve the above problems. Summary of the Invention

[0008] In order to overcome the above deficiencies, the utility model provides a flow guide cover for an electric submersible pump, which includes a flow guide pipe 2 and a docking flange 1. The flow guide pipe 2 is a cylindrical shape with openings at both the upper and lower ends, and a pair of connection holes 21 are provided at the upper part of the flow guide pipe 2;

[0009] On the side wall of the upper half flange of the docking flange 1, there are jackscrew insertion holes 11. The jackscrew insertion holes 11 are provided with matching jackscrews. When the jackscrews are inserted into the jackscrew insertion holes 11, the upper half flange of the docking flange 1 can be connected to the separator. When the separator is in use, the lower part is connected to an electric submersible pump;

[0010] The diameter of the upper half flange of the docking flange 1 is larger than that of the lower half flange of the docking flange 1. The upper half flange and the lower half flange of the docking flange 1 are in a stepped shape;

[0011] The flow guide pipe 2 is sleeved on the lower half flange of the docking flange 1, and the top of the flow guide pipe 2 abuts against the bottom surface of the upper half flange of the docking flange 1;

[0012] On the side wall of the lower half flange of the docking flange 1, there are paired connecting pipes 12. Each connecting pipe 12 is provided with a matching connecting block. At the same time, the connecting block is adapted to the connecting hole 21. When the connecting block is sequentially inserted into the connecting hole 21 and the connecting pipe 12, the flow guide pipe 2 can be connected to the lower half flange of the docking flange 1, thus achieving the effect of covering the separator and the electric submersible pump with the flow guide pipe 2.

[0013] Furthermore, a circle of convex ribs is provided on the circumferential side of the middle part of the flow guide pipe, which is convenient for being held or connected by a machine during operation.

[0014] The beneficial effects of the present utility model are:

[0015] The flow guide cover for an electric submersible pump described in the present utility model has the following advantages:

[0016] 1. Improve the heat dissipation efficiency:

[0017] The flow guide cover forces the well fluid and the wellhead injection fluid to flow through the submersible motor from the lower end of the protective cover and enter the suction port of the centrifugal pump, increasing the flow rate of the well fluid flowing through the submersible motor. This design is beneficial to taking away the heat on the surface of the motor and improving the heat dissipation efficiency. Water flowing through the motor surface through the flow guide cover can take away the heat generated by the motor, achieving the effect of cooling and temperature reduction, thereby increasing the service life of the motor;

[0018] 2. Prevent gas locking:

[0019] The design of the flow guide cover reduces the gas entering the pump, effectively preventing the occurrence of gas locking and ensuring the normal operation of the electric submersible pump unit;

[0020] 3. Prolong the service life of the unit:

[0021] By improving the heat dissipation efficiency and preventing gas locking, the flow guide cover reduces the operating temperature of the electric submersible pump unit, plays a protective role for the electric submersible pump, reduces the wear and failure rate of the unit, and thus prolongs the operating life of the unit;

[0022] 4. Improve the pumping efficiency:

[0023] During the operation, it plays a role in stabilizing the diversion of the suction force of the electric submersible pump, making the liquid flow faster, increasing the flow rate of the well fluid, and thus improving the pumping efficiency.

[0024] It has a wide range of applications, is easy to install, simple to disassemble, and has strong adaptability. Description of the Drawings

[0025] Figure 1 It is a perspective view of a flow guide cover for an electric submersible pump;

[0026] Figure 2 It is a perspective view of the docking flange;

[0027] Figure 3 It is a perspective view of the flow guide pipe;

[0028] Figure 4 It is a perspective view of the usage state of a flow guide cover for an electric submersible pump;

[0029] Wherein:

[0030] 1 - Docking flange; 2 - Flow guide pipe; 3 - Separator; 11 - Jacking screw socket; 12 - Connecting pipe; 21 - Connecting hole. Detailed Implementation Manner

[0031] A flow guide cover for an electric submersible pump includes a flow guide pipe 2 and a docking flange 1. The flow guide pipe 2 is a cylindrical shape with openings at both the top and bottom. A pair of connecting holes 21 are provided at the upper part of the flow guide pipe 2;

[0032] On the side wall of the upper half flange of the docking flange 1, there is a jacking screw socket 11. The jacking screw socket 11 is provided with a jacking screw. When the jacking screw is inserted into the jacking screw socket 11, the upper half flange of the docking flange 1 can be connected to the separator. When in use, the separator is connected to the electric submersible pump at the lower part;

[0033] The diameter of the upper half flange of the docking flange 1 is larger than that of the lower half flange of the docking flange 1. The upper half flange and the lower half flange of the docking flange 1 are in a stepped shape;

[0034] The flow guide pipe 2 is sleeved on the lower half flange of the docking flange 1, and the top of the flow guide pipe 2 abuts against the bottom surface of the upper half flange of the docking flange 1;

[0035] On the side wall of the lower half flange of the docking flange 1, there are paired connecting pipes 12. Each connecting pipe 12 is provided with a connecting block. At the same time, the connecting block is adapted to the connecting hole 21. When the connecting block is sequentially inserted into the connecting hole 21 and the connecting pipe 12, the flow guide pipe 2 can be connected to the lower half flange of the docking flange 1, thus achieving the effect of covering the separator and the electric submersible pump with the flow guide pipe 2.

[0036] Further, a ring of convex ribs is provided on the circumferential side of the middle part of the diversion pipe, which is convenient for being held or connected by a machine during operation.

[0037] Usage method:

[0038] The setscrew is inserted into the setscrew jack 11 to connect the upper half flange of the docking flange 1 to the separator. When the separator is in use, the lower part is connected to the electric submersible pump;

[0039] The connecting block is successively inserted into the connecting hole 21 and the connecting pipe 12 to connect the diversion pipe 2 to the upper half flange of the docking flange 1, thus achieving the effect of covering the diversion pipe 2 outside the separator and the electric submersible pump.

[0040] The flow guide cover forces the well fluid and the wellhead injection fluid to flow through the submersible motor from the lower end of the protective cover and enter the suction port of the centrifugal pump, increasing the flow rate of the well fluid flowing through the submersible motor. The design of the flow guide cover reduces the gas entering the pump. The flow guide cover plays a stable guiding role in the suction force of the electric submersible pump during use by improving the heat dissipation efficiency and preventing gas locking, and plays a protective role for the electric submersible pump.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0043] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A flow guide cover for an electric submersible pump, characterized in that: It comprises a flow guide pipe (2) and a docking flange (1), wherein the flow guide pipe (2) is a cylindrical shape with upper and lower openings, and a pair of connecting holes (21) are provided on the upper part of the flow guide pipe (2); A top screw insertion hole (11) is provided on the side wall of the upper flange of the butt flange (1), and a top screw is provided in the top screw insertion hole (11). The top screw can be inserted into the top screw insertion hole (11) to connect the upper flange of the butt flange (1) to the separator, and the separator is connected to the electric submersible pump when in use; The diameter of the upper flange of the docking flange (1) is larger than that of the lower flange of the docking flange (1), and the upper flange of the docking flange (1) and the lower flange of the docking flange (1) are in a step shape; The flow guide pipe (2) is sleeved on the lower half flange of the docking flange (1), and the top of the flow guide pipe (2) is pressed against the bottom surface of the upper half flange of the docking flange (1); A pair of connecting pipes (12) are provided on the side wall of the lower half flange of the docking flange (1), each connecting pipe (12) is provided with a connecting block, and the connecting block and the connecting hole (21) are adapted to each other. The connecting block is inserted into the connecting hole (21) and the connecting pipe (12) in sequence, so that the guide pipe (2) can be connected to the lower half flange of the docking flange (1); A circle of convex ridges is arranged on the pipe circumference side of the middle part of the guide pipe, so as to facilitate holding or connecting by a machine during operation.

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