Magnetic suspension intelligent submersible electric plunger pump machine

Abstract

The invention discloses a magnetic suspension intelligent submersible electric plunger pump machine which comprises a pump cylinder used for being placed in an oil well and internally provided with a hollow cavity for original oil to pass through. A submersible linear motor is arranged in the pump cylinder, and an output shaft of the submersible linear motor is connected with a plunger assembly located in the pump cylinder and used for driving the plunger assembly to move in the axial direction. The plunger assembly comprises a movable plunger, a traveling valve is arranged in the movable plunger, and the traveling valve floats up and down in the movable plunger to seal the movable plunger; at least one limiting shell located below the movable plunger is arranged in the pump cylinder, a fixed valve is arranged in the limiting shell, moves up and down in the limiting shell and is used for sealing the limiting shell, the technical problems that mechanical loss is large, efficiency is low, and the pump is prone to being clamped are solved, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plunger pump, in particular to a magnetic suspension intelligent electric submersible plunger pump. BACKGROUND

[0002] In the field of oil exploitation, especially in low-yield liquid wells, inclined wells, deep wells and high-gas and high-sand oil wells, electric submersible pump systems are widely used in the lifting operation of crude oil. The traditional electric submersible pump system is usually composed of three parts: a submersible motor, a reducer (or a protector) and a centrifugal pump (or a multi-stage plunger pump). Among them, the submersible motor is usually a three-phase asynchronous rotating motor, and its output is rotary motion. It needs to convert the rotary motion into reciprocating linear motion of the plunger through mechanical transmission devices (such as reduction boxes, crank link mechanisms or belt drives), so as to realize the pumping function.

[0003] In addition, the conventional pumping unit - sucker rod drive system (i.e. "kowtow machine") is also widely used in land oil fields. This system drives the downhole plunger pump to work by driving the sucker rod string up and down through the ground beam-type pumping unit. This kind of system has mature structure, but has problems such as low system efficiency, high energy consumption, large ground equipment area, frequent maintenance, etc., and is not suitable for offshore platforms, intelligent oil fields and remote unattended well sites.

[0004] Therefore, there is an urgent need for a new type of electric submersible plunger pump system with simplified structure, efficient transmission, reliable operation and intelligent control, to overcome the above-mentioned defects of the prior art and meet the development needs of modern oil field intelligentization, digitization and high efficiency and energy saving. SUMMARY

[0005] The technical problem solved by the present application is to provide a magnetic suspension intelligent electric submersible plunger pump.

[0006] The present application provides a magnetic suspension intelligent electric submersible plunger pump, comprising, a pump barrel for placing in an oil well, having a hollow cavity inside for placing the original oil; a submersible linear motor is arranged in the pump barrel, and the output shaft of the submersible linear motor is connected to a plunger assembly in the pump barrel for driving the plunger assembly to move axially; the plunger assembly comprises a movable plunger, and a traveling valve is arranged in the movable plunger, which floats up and down in the movable plunger to seal the movable plunger; The pump cylinder is internally provided with at least one limiting shell below the movable plunger, the limiting shell is internally provided with a fixed valve, the fixed valve moves up and down in the limiting shell and is used for sealing the limiting shell; when the plunger assembly goes down, the movable valve unseals the plunger assembly, the fixed valve seals the limiting shell, and the upper section of the hollow cavity of the pump cylinder starts to fill with crude oil; when the plunger assembly goes up, the movable valve seals the plunger assembly, the fixed valve unseals the limiting shell, and the crude oil enters the pump cylinder through the inner cavity of the limiting shell.

[0007] Further, the limiting shell is internally provided with a hollow cavity, the top end of which is gradually expanded downward, and is used for limiting the fixed valve.

[0008] Further, the inner wall of the limiting shell is provided with a first oil passing inner shell, a first oil passing cavity is arranged between the first oil passing inner shell and the limiting shell, and the fixed valve is arranged in the first oil passing inner shell.

[0009] Further, the movable plunger is internally provided with a hollow cavity, the top end of which is gradually expanded downward, and is used for limiting the movable valve.

[0010] Further, the inner wall of the movable plunger is provided with a second oil passing inner shell, a second oil passing cavity is arranged between the second oil passing inner shell and the movable plunger, and the movable valve is arranged in the second oil passing inner shell.

[0011] Further, the bottom end of the pump cylinder is provided with an elastic centralizer, so that the axis of the pump cylinder coincides with the axis of the oil well.

[0012] Further, the upper end of the pump cylinder is communicated with an oil delivery pipe, and the oil delivery pipe is internally provided with a drain valve.

[0013] Further, the part of the pump pipe located in the crude oil liquid surface is provided with a plurality of interval arranged sensor systems, the sensor systems are electrically connected with a monitoring center, the monitoring center is wirelessly connected with the handheld terminal, the handheld terminal is wirelessly connected with a controller, and the controller is wirelessly connected with the monitoring center.

[0014] Further, the sensor systems are electrically connected with the controller.

[0015] Further, the monitoring center is wirelessly connected with a cloud platform.

[0016] Compared with the prior art, the movable valve is sealed or unsealed by the submersible linear motor, the fixed valve is sealed or unsealed by the limiting shell, the traditional rotary motor connection reduction box is cancelled, the mechanical conversion structure is connected through the reduction box and the crank connecting rod, the technical problems of large mechanical loss, low efficiency and easy pump jamming are solved, and the structure is simple. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0018] Figure 1 This is an overall schematic diagram of the magnetic levitation intelligent submersible electric plunger pump of the present invention; Figure 2 This is a schematic diagram of the secondary structure of the magnetic levitation intelligent submersible electric plunger pump of the present invention; Figure 3 This is a connection diagram of the magnetic levitation intelligent submersible electric plunger pump system of the present invention.

[0019] The reference numerals in the attached figures include: Pump cylinder 1; 2. Plunger assembly; 21. Moving plunger; 22. Floating valve; 23. Second oil passage inner shell; 24. Second oil passage cavity; Limiting housing 3; fixing valve 31; first oil passage inner housing 32; first oil passage cavity 33; Elastic stabilizer 4; Oil drain valve 5; Oil pipeline 6. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] like Figure 1 As shown, the magnetic levitation intelligent submersible electric plunger pump of the present invention includes a pump barrel 1, which is placed inside an oil well and has a hollow cavity for crude oil to pass through. A submersible linear motor is installed inside the pump barrel 1, which can directly generate linear motion without the need for a mechanical conversion device to convert rotational motion into linear motion. Specifically, the submersible linear motor includes a stator, typically made of high-strength, corrosion-resistant material to resist erosion from the downhole environment. A coil is wound inside the stator, generating a magnetic field when energized. A mover is spaced apart inside the stator, performing linear motion rather than rotational motion. The mover typically includes one or more permanent magnets or electromagnets that move in a straight line under the influence of the magnetic field generated by the stator. The mover is connected to a plunger assembly 2 and is used to drive the plunger assembly 2 to move axially up and down.

[0022] As Figure 1 shown, the output shaft of the submersible linear motor is connected to the plunger assembly 2 located in the pump barrel 1, for driving the plunger assembly 2 to move axially; the plunger assembly 2 comprises a movable plunger 21, which is long and hollow, and has an upper opening and a lower opening; a traveling valve 22 is arranged in the movable plunger 21; the traveling valve 22 is elliptical, and tightly fits with the movable plunger 21; the traveling valve 22 floats up and down in the movable plunger 21, and seals the movable plunger 21.

[0023] As Figure 1 shown, at least one limiting shell 3 is arranged in the pump barrel 1 below the movable plunger 21; the limiting shell 3 is long and hollow, and has an upper opening and a lower opening; a fixed valve 31 is arranged in the limiting shell 3; the fixed valve 31 tightly fits with the limiting shell 3; the fixed valve 31 moves up and down in the limiting shell 3, and seals the limiting shell 3; when the plunger assembly 2 moves downward, the traveling valve 22 unseals the plunger assembly 2, and the fixed valve 31 seals the limiting shell 3; the upper section of the hollow cavity of the pump barrel 1 starts to fill with crude oil; when the plunger assembly 2 moves upward, the traveling valve 22 seals the plunger assembly 2, and the fixed valve 31 unseals the limiting shell 3; the crude oil enters the pump barrel 1 through the inner cavity of the limiting shell 3.

[0024] Compared with the prior art, the traveling valve 22 is driven by the submersible linear motor to seal or unseal the movable plunger 21, and the fixed valve 31 is driven by the submersible linear motor to seal or unseal the limiting shell 3; the traditional rotating motor is cancelled, and the mechanical conversion structure connected with the crank connecting rod through the reduction box is cancelled; the technical problems of large mechanical loss, low efficiency and easy pump jamming are solved; and the structure is simple.

[0025] As Figure 2 shown, the limiting shell 3 is provided with a hollow cavity, the top end of which is gradually expanded downward, and is outwardly conical, for limiting the fixed valve 31; a first oil passing inner shell 32 is arranged on the inner wall of the limiting shell 3; a first oil passing cavity 33 is arranged between the first oil passing inner shell 32 and the limiting shell 3; when the fixed valve 31 unseals the limiting shell 3, the crude oil passes through the first oil passing cavity 33 through the first oil passing cavity 33; and the fixed valve 31 is arranged on the inner side of the first oil passing inner shell 32.

[0026] As Figure 2As shown, the movable plunger 21 is provided with a hollow cavity, the top end of which is gradually expanded downward, used for limiting the floating valve 22. The inner wall of the movable plunger 21 is provided with a second oil passing inner shell 23, and the second oil passing inner shell 23 is provided with a second oil passing cavity 24 with the movable plunger 21, used for the crude oil to pass through the second oil passing cavity 24 when the floating valve 22 releases the sealing of the movable plunger 21, and the second oil passing inner shell 23 is provided with the floating valve 22.

[0027] As shown in the drawings, Figure 2 As shown, the bottom end of the pump cylinder 1 is provided with an elastic centralizer 4, so that the axis of the pump cylinder 1 coincides with the axis of the oil well.

[0028] As shown in the drawings, Figure 2 As shown, the upper end of the pump cylinder 1 is connected with an oil delivery pipe 6, and the oil delivery pipe 6 is provided with a pressure relief valve 5, used for pressure relief of the oil delivery pipe 6.

[0029] As shown in the drawings, Figure 3 As shown, the part of the pump pipe located in the crude oil liquid surface is provided with a plurality of interval arranged sensor systems, the sensor systems including temperature sensors and pressure sensors, used for monitoring the temperature and pressure of the crude oil layer. The sensor systems are electrically connected with a monitoring center, used for mutual transmission of monitoring data between the monitoring center and the sensor systems; the monitoring center is wirelessly connected with the handheld terminal, used for transmission of monitoring data from the monitoring center to the handheld terminal; the handheld terminal is wirelessly connected with a controller, used for transmission of data to the controller; the controller is wirelessly connected with the monitoring center. The sensor systems are electrically connected with the controller. The monitoring center is wirelessly connected with a cloud platform, realizing automatic parameter adjustment according to the liquid supply capacity of the oil layer and production needs, realizing intelligent oil extraction; facilitating block management and factory oil extraction; through effective monitoring and control of the dynamic liquid level depth, the yield can be increased; the oil well production parameters can be directly connected with the oil field digital monitoring platform.

[0030] It should be noted that all directionality indications in the embodiments of the present application (such as up, down, left, right, front, back, …) are only used to explain the relative position relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directionality indications also change accordingly.

[0031] In addition, the descriptions in the present application involving "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of the person skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0032] Although the preferred embodiments of the present application have been described, those skilled in the art who are familiar with the basic inventive concept can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0033] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A magnetic levitation intelligent electric submersible pump (ESCP) with a motorized plunger, characterized in that, The utility model relates to a pump barrel (1) for placing in oil well, inside is equipped with the hollow cavity for the original through, the pump barrel (1) is equipped with submersible linear motor, the output shaft of submersible linear motor is connected in plunger assembly (2) in the pump barrel (1), is used to drive plunger assembly (2) axial movement, plunger assembly (2) includes movable plunger (21), movable plunger (21) is equipped with floating valve (22) inside, floating valve (22) is up and down in movable plunger (21) and floats, and movable plunger (21) is sealed, The pump barrel (1) is equipped with at least one limit shell (3) below movable plunger (21), the limit shell (3) is equipped with fixed valve (31) inside, the fixed valve (31) moves up and down in the limit shell (3), is used to seal the limit shell (3), when plunger assembly (2) goes down, floating valve (22) unseals plunger assembly (2), and fixed valve (31) seals the limit shell (3), and the upper section of the hollow cavity of pump barrel (1) begins to fill crude oil, when plunger assembly (2) goes up, floating valve (22) seals plunger assembly (2), and fixed valve (31) unseals the limit shell (3), and crude oil enters the pump barrel (1) through the inner cavity of limit shell (3), The part of pump pipe lower end is located in the part of crude oil liquid level and is equipped with multiple interval sensor systems, the sensor system is electrically connected monitoring center, the monitoring center is wirelessly connected with handheld terminal, the handheld terminal is wirelessly connected with controller, and the controller is wirelessly connected with monitoring center, the sensor system is electrically connected with controller, and the monitoring center is wirelessly connected with cloud platform. The limit shell (3) is equipped with hollow cavity, and the top end gradually expands downward, is used to limit fixed valve (31).

2. The magnetic levitation intelligent submersible electric plunger pump machine of claim 1, wherein, The limit shell (3) is equipped with first oil passing inner shell (32), and the first oil passing inner shell (32) is equipped with first oil passing cavity (33) between limit shell (3), and the first oil passing inner shell (32) is equipped with fixed valve (31).

3. The magnetic levitation intelligent submersible electric plunger pump machine of claim 2, wherein, The movable plunger (21) is equipped with hollow cavity, and the top end gradually expands downward, is used to limit floating valve (22).

4. The magnetic levitation intelligent submersible electric plunger pump machine of claim 1, wherein, The movable plunger (21) is equipped with second oil passing inner shell (23), and the second oil passing inner shell (23) is equipped with second oil passing cavity (24) between movable plunger (21), and the second oil passing inner shell (23) is equipped with floating valve (22).

5. The magnetic levitation intelligent submersible electric plunger pump machine of claim 4, wherein, The pump barrel (1) bottom is equipped with elastic centralizer (4), makes the pump barrel (1) axis and oil well axis coincide.

6. The magnetic levitation intelligent submersible electric plunger pump machine of claim 1, wherein, The pump barrel (1) upper end is communicated with oil pipe (6), and the oil pipe (6) is equipped with oil valve (5).

7. The magnetic levitation intelligent submersible electric plunger pump machine of claim 1, wherein, ​

Images