阅读说明：本技术 串联潜油直线电机无杆采油系统 (Rodless oil production system of serial submersible linear motor ) 是由 黄晓东 谢斌 姚金杭 薛瑾 张辉 雷德荣 陈瑞祥 杨新克 郭长永 何利 张丽萍 于 2020-06-16 设计创作，主要内容包括：本发明提供了一种串联潜油直线电机无杆采油系统。串联潜油直线电机无杆采油系统,包括：电机,电机为多个,多个电机沿竖直方向串联设置,且电机包括定子部分和动子部分；推杆,推杆设置在多个电机的顶端,且推杆与多个电机中的位于顶端的电机的动子部分连接；泵筒总成,泵筒总成套设在推杆的外部,且泵筒总成与多个电机中的位于顶端的电机的定子部分连接；柱塞总成,柱塞总成设置在泵筒总成内部,且柱塞总成与推杆远离电机的一端连接；油管,油管与泵筒总成远离电机的一端连接；动力电缆,动力电缆与多个电机电连接。本发明解决了现有技术中潜油直线电机推力不能满足下入深度要求的问题。(The invention provides a rodless oil production system of a serial submersible linear motor. The oily linear electric motor rodless oil recovery system of latent oil of establishing ties includes: the motor comprises a plurality of motors, the motors are arranged in series along the vertical direction, and each motor comprises a stator part and a rotor part; the push rod is arranged at the top ends of the motors and is connected with the rotor part of the motor positioned at the top end in the motors; the pump cylinder assembly is sleeved outside the push rod and is connected with a stator part of the motor positioned at the top end in the plurality of motors; the plunger assembly is arranged in the pump barrel assembly and is connected with one end of the push rod, which is far away from the motor; the oil pipe is connected with one end of the pump cylinder assembly, which is far away from the motor; and the power cable is electrically connected with the plurality of motors. The invention solves the problem that the thrust of the submersible linear motor in the prior art can not meet the requirement of the penetration depth.)

1. The utility model provides a oily linear electric motor rodless oil recovery system dives in series which characterized in that includes:

the motor comprises a plurality of motors (10), the motors (10) are arranged in series along the vertical direction, and each motor (10) comprises a stator part (11) and a rotor part (12);

the push rod (20), the push rod (20) is arranged at the top end of the plurality of motors (10), and the push rod (20) is connected with the rotor part (12) of the motor (10) which is positioned at the top end in the plurality of motors (10);

the pump cylinder assembly (30) is sleeved outside the push rod (20), and the pump cylinder assembly (30) is connected with a stator part (11) of the motor (10) positioned at the top end in the plurality of motors (10);

a plunger assembly (40), wherein the plunger assembly (40) is arranged inside the pump barrel assembly (30), and the plunger assembly (40) is connected with one end of the push rod (20) far away from the motor (10);

the oil pipe (50), the oil pipe (50) is connected with one end of the pump cylinder assembly (30) far away from the motor (10);

a power cable (60), the power cable (60) being electrically connected to the plurality of motors (10).

2. The tandem submersible linear motor rodless production system according to claim 1, wherein the power cable (60) extends from the motor (10) towards the oil pipe (50), and the power cable (60) is fixedly connected to the outer side wall of the pump barrel assembly (30) and the outer side wall of the oil pipe (50), respectively.

3. The tandem submersible linear motor rodless production system according to claim 2, further comprising a first fixture by which at least a portion of the power cable (60) is fixed to an outer sidewall of the oil pipe (50) distal from the motor (10), and a second fixture by which at least another portion of the power cable (60) is fixed to an outer sidewall of the oil pipe (50) proximal to the motor (10).

4. The tandem submersible linear motor rodless production system according to claim 1, where the pump barrel assembly (30) is arranged coaxially with the stator sections (11) of multiple motors (10).

5. The tandem submersible linear motor rodless production system according to claim 1, wherein the plunger assembly (40) is disposed coaxially with a plurality of mover sections (12) of the motor (10).

6. The tandem submersible linear motor rodless production system according to any of the claims 1 to 5, characterized by that it further comprises a screen (70), where the screen (70) is placed between the pump barrel assembly (30) and the motor (10), and where the pump barrel assembly (30) is connected to the stator part (11) through the screen (70).

7. The tandem submersible linear motor rodless production system according to any of claims 1-5, characterized by further comprising a casing (80), the motor (10), the pump barrel assembly (30), the plunger assembly (40), the tubing (50), and the power cable (60) all being disposed inside the casing (80).

8. The tandem submersible linear motor rodless production system according to claim 7, characterized in that the outer sidewall of the casing (80) near one end of the motor (10) has a bore (81).

9. The tandem submersible linear motor rodless production system according to claim 7, wherein the casing (80) is disposed coaxially with the tubing (50).

10. The tandem submersible linear motor rodless production system according to any of claims 1 to 5, characterized by further comprising a plurality of connection lines (90), through which the plurality of motors (10) are electrically connected.

Technical Field

The invention relates to the field of oil exploitation equipment, in particular to a rodless oil production system with serial submersible linear motors.

Background

In recent years, the application scale of the electric submersible plunger pump lifting technology in oil fields is gradually increased, and the working principle of the electric submersible plunger pump lifting technology is that the reciprocating linear motion of a linear motor rotor drives an oil pump plunger to move so as to lift crude oil. Compared with the traditional beam type sucker-rod pump, the pump has the following advantages: firstly, the energy transfer link of the middle sucker rod is reduced, the energy consumption is greatly reduced, and the problems of eccentric wear of the pipe rod and breakage and falling of the sucker rod are thoroughly avoided; secondly, production parameters are adjusted through a ground intelligent control cabinet, and the optimized operation of the oil extraction system is easy to realize; and thirdly, a packing box of the pumping well does not exist at the well mouth, so that the problem of oil leakage at the sealing part of the well mouth and the rod string is thoroughly solved, and the strict environmental protection requirement of the oil exploitation industry is met. At present, linear motors which are applied on site have various specifications, and meet the technical requirements of oil field sites to a certain extent.

The electric submersible plunger pump integrates a power device and an oil well pump, can realize on-line random parameter adjustment, saves the oil well pumping unit and an oil pumping rod, reduces the installation operation time and cost, and reduces the energy consumption.

Structurally, the submersible linear motor consists of a rotor, a stator and a casing from inside to outside in sequence. A stator of the linear motor is provided with a plurality of groove-shaped circular rings, annular coils are assembled in the grooves, a rotor of the linear motor usually adopts a steel pipe, and the surface of the steel pipe is covered with a layer of copper sheet or aluminum sheet with the thickness of 1-2 mm. After the three-phase alternating current is introduced into the linear motor, the coil on the stator generates an air-gap magnetic field, the magnetic field is distributed in a sine mode, when the three-phase current changes along with time, the air-gap magnetic field moves along the phase sequence of the three-phase alternating current along a straight line, and the magnetic field is translated and called as a traveling wave magnetic field. The rotor is cut by the traveling wave magnetic field to generate induced electromotive force and current, the interaction between the magnetic field formed by the rotor current and the air gap magnetic field can generate electromagnetic thrust, at the moment, the linear motor stator is fixed, and the linear motor rotor linearly moves along the direction of the traveling wave magnetic field. Because the linear motor works underground, the motor is always in high-temperature and high-pressure oil gas water, strict requirements on bearing and sealing of the linear motor are met, in addition, the lifting force and the outer diameter of the motor are higher in the lifting of a small well hole of a deep well, and the linear motor is required to have larger thrust and smaller outer diameter

In order to reduce the cost of well drilling and completion, the deeply buried low permeability block in China is mainly developed by 5in (inner diameter)) And 51/2in (inner diameter)) Is completed with small size casing. Aiming at the deep well lifting problem of 51/2in casing, Xinjiang oil field firstly conducts domestic research and test on the matching of WFQYDB-114-The deep pumping technology of the oil well pump meets the requirements that the lower pump depth is less than or equal to 3500m and the discharge capacity is less than or equal to 10m3/dAnd (5) meeting the production requirement. However, for oil reservoirs with the pump depth requirements at 4000m and 4500m, the thrust of the existing linear motor cannot meet the deep-entering requirements.

At present, the main requirement for lifting deep wells is the outer diameterThrust 35kN and outer diameterA linear motor with the thrust of 60 kN. Sinkiang oil field has been subjected to outside diameter treatment in 51/2in casingThe deep pumping test of the 35kN thrust linear motor meets the technical requirement of lifting an oil well within 3500m of a pump hanger. However, the linear motor for further deepening the pump hanger to meet the lifting depth of 3500m-5000m in a small-size casing mainly has the problems that the lifting force is insufficient, the outer diameter of a steel body is too large, and the casing cannot be lowered below 51/2in, so that the application of the technology in a small-casing deep pumping well is hindered. Therefore, a new small-diameter large-thrust linear motor capable of meeting the production requirement of 51/2in small casing pipes needs to be designed to expand the application range of the technology.

Therefore, the problem that the thrust of the submersible linear motor in the prior art cannot meet the requirement of the running depth exists.

Disclosure of Invention

The invention mainly aims to provide a rodless oil extraction system of a serial submersible linear motor, which aims to solve the problem that the thrust of the submersible linear motor in the prior art cannot meet the requirement of the depth of penetration.

In order to achieve the above object, according to one aspect of the present invention, there is provided a rodless oil recovery system of a tandem submersible linear motor, including: the motor comprises a plurality of motors, the motors are arranged in series along the vertical direction, and each motor comprises a stator part and a rotor part; the push rod is arranged at the top ends of the motors and is connected with the rotor part of the motor positioned at the top end in the motors; the pump cylinder assembly is sleeved outside the push rod and is connected with a stator part of the motor positioned at the top end in the plurality of motors; the plunger assembly is arranged in the pump barrel assembly and is connected with one end of the push rod, which is far away from the motor; the oil pipe is connected with one end of the pump cylinder assembly, which is far away from the motor; and the power cable is electrically connected with the plurality of motors.

Furthermore, the power cable extends towards the oil pipe from the motor, and the power cable is fixedly connected with the outer side wall of the pump cylinder assembly and the outer side wall of the oil pipe respectively.

Furthermore, the rodless oil production system of the serial submersible linear motor further comprises a first fixing piece and a second fixing piece, at least one part of the power cable is fixed on the outer side wall of one end, far away from the motor, of the oil pipe through the first fixing piece, and at least the other part of the power cable is fixed on the outer side wall of one end, close to the motor, of the oil pipe through the second fixing piece.

Further, the pump barrel assembly is disposed coaxially with stator portions of the plurality of motors.

Further, the plunger assembly is disposed coaxially with the mover portions of the plurality of motors.

Furthermore, the rod-free oil production system with the serial submersible linear motors further comprises a sieve tube, the sieve tube is arranged between the motors of the pump cylinder assembly, and the pump cylinder assembly is connected with the stator part through the sieve tube.

Furthermore, the rod-free oil production system of the serial submersible linear motor further comprises a sleeve, and the motor, the pump cylinder assembly, the plunger assembly, the oil pipe and the power cable are all arranged inside the sleeve.

Further, the outer side wall of the end of the sleeve close to the motor has a hole.

Further, the casing is arranged coaxially with the tubing.

Furthermore, the rodless oil production system of the serial submersible linear motor further comprises a plurality of connecting wires, and the motors are electrically connected through the connecting wires.

By applying the technical scheme of the invention, the rodless oil production system of the serial submersible linear motor comprises a motor, a push rod, a pump cylinder assembly, a plunger assembly, an oil pipe and a power cable. The motor comprises a plurality of motors, the motors are arranged in series along the vertical direction, and each motor comprises a stator part and a rotor part; the push rod is arranged at the top ends of the motors and is connected with the rotor part of the motor positioned at the top end in the motors; the pump cylinder assembly is sleeved outside the push rod and is connected with a stator part of a motor positioned at the top end in the plurality of motors; the plunger assembly is arranged in the pump barrel assembly and is connected with one end of the push rod, which is far away from the motor; the oil pipe is connected with one end of the pump cylinder assembly, which is far away from the motor; the power cable is electrically connected with the plurality of motors.

When the serial submersible linear motor rodless oil production system with the structure is used, the motors are multiple, and the motors are arranged in series along the vertical direction, so that the length of the motors can be increased under the condition that the diameter of the motors is not increased, and the thrust of the motors is improved. Therefore, the oil field production of deeper lower pump degree of depth can be satisfied effectively to the oily linear electric motor rodless oil recovery system of diving of establishing ties in this application. Therefore, the problem that the thrust of the submersible linear motor in the prior art cannot meet the requirement of the penetration depth is effectively solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic of a tandem submersible linear motor rodless production system according to an embodiment of the present invention; and

fig. 2 shows a schematic connection diagram between two adjacent motors of the tandem submersible linear motor rodless production system in the present application.

Wherein the figures include the following reference numerals:

10. a motor; 11. a stator portion; 12. a mover portion; 20. a push rod; 30. a pump barrel assembly; 40. a plunger assembly; 50. an oil pipe; 60. a power cable; 70. a screen pipe; 80. a sleeve; 81. an eyelet; 90. and connecting the wires.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that the thrust of the submersible linear motor in the prior art can not meet the requirement of the depth of penetration, the application provides a rodless oil production system of the serial submersible linear motor.

As shown in fig. 1 and 2, the tandem submersible linear motor rodless production system in the present application includes a motor 10, a push rod 20, a pump barrel assembly 30, a plunger assembly 40, a tubing 50, and a power cable 60. The number of the motors 10 is multiple, the motors 10 are arranged in series along the vertical direction, and each motor 10 comprises a stator part 11 and a rotor part 12; the push rod 20 is arranged at the top end of the plurality of motors 10, and the push rod 20 is connected with the mover part 12 of the motor 10 at the top end among the plurality of motors 10; the pump barrel assembly 30 is sleeved outside the push rod 20, and the pump barrel assembly 30 is connected with the stator part 11 of the motor 10 positioned at the top end in the plurality of motors 10; the plunger assembly 40 is arranged inside the pump barrel assembly 30, and the plunger assembly 40 is connected with one end of the push rod 20 far away from the motor 10; the oil pipe 50 is connected with one end of the pump cylinder assembly 30 far away from the motor 10; the power cable 60 is electrically connected to the plurality of motors 10.

When the rodless oil extraction system with the structure is used, the motors 10 are multiple, and the motors 10 are arranged in series along the vertical direction, so that the length of the motor 10 can be increased under the condition that the diameter of the motor 10 is not increased, and the thrust of the motor 10 is improved. Therefore, the oil field production of deeper lower pump degree of depth can be satisfied effectively to the oily linear electric motor rodless oil recovery system of diving of establishing ties in this application. Therefore, the problem that the thrust of the submersible linear motor in the prior art cannot meet the requirement of the penetration depth is effectively solved.

Moreover, it should be noted that the well servicing operation can also be facilitated by arranging a plurality of motors 10 in series.

Specifically, the power cable 60 extends from the motor 10 toward the oil pipe 50, and the power cable 60 is fixedly connected to an outer sidewall of the pump cylinder assembly 30 and an outer sidewall of the oil pipe 50, respectively. Through setting up like this, can fix power cable 60 effectively to can guarantee the stability of being connected between power cable 60 and the motor 10 effectively, and then can guarantee the normal operating of the oily linear electric motor rodless oil recovery system of serial connection diving effectively.

In the present application, after the power cable 60 is powered on, the mover portion 12 of the motor 10 moves up and down inside the stator portion 11, and pushes the plunger assembly 40 to move up and down in the pump barrel assembly 30, the moving valve on the plunger assembly 40 moves down to open, the fixed valve on the pump barrel assembly 30 closes, the oil flow enters the oil pumping chamber formed by the plunger assembly 40 and the pump barrel assembly 30, the moving valve on the plunger assembly 40 moves up to close, the fixed valve on the pump barrel assembly 30 opens, the oil flow in the oil pumping chamber formed by the plunger assembly 40 and the pump barrel assembly 30 enters the oil pipe 50 through the fixed valve on the pump barrel assembly 30 to complete a stroke, and the bottom oil flow is lifted to the ground through the oil pipe 50 by continuous circular reciprocating motion.

In an embodiment of the present application, which is not shown in the drawings, the tandem submersible linear motor rodless production system further includes a first fastener and a second fastener, at least one portion of the power cable 60 is fixed on the outer sidewall of the end of the oil pipe 50 far away from the motor 10 by the first fastener, and at least another portion of the power cable 60 is fixed on the outer sidewall of the end of the oil pipe 50 near the motor 10 by the second fastener. By this arrangement, the power cable 60 can be further effectively fixed.

Specifically, the pump cylinder assembly 30 is disposed coaxially with the stator portions 11 of the plurality of motors 10.

Specifically, the plunger assembly 40 is disposed coaxially with the mover portions 12 of the plurality of motors 10.

Through the arrangement, the whole serial submersible linear motor rodless oil production system can be effectively ensured not to deflect and reduce abrasion in the operation process.

Optionally, the tandem submersible linear motor rodless production system further comprises a screen 70, the screen 70 is disposed between the motors 10 of the pump barrel assembly 30, and the pump barrel assembly 30 is connected with the stator portion 11 of the motor 10 through the screen 70.

Specifically, the tandem submersible linear motor rodless oil production system further comprises a casing 80, and the motor 10, the pump cylinder assembly 30, the plunger assembly 40, the oil pipe 50 and the power cable 60 are all arranged inside the casing 80. The outer side wall of the sleeve 80 at the end near the motor 10 has a hole 81.

In this application, tubing 50 serves as a flow path and casing serves as a wellbore protection path, formation flow enters the casing through casing perforations 81, tubing 50 is connected to the upper portion of pump barrel assembly 30, and the lower portion of pump barrel assembly 30 is connected to the upper portion of screen 70.

In one embodiment of the present application, the casing 80 is disposed coaxially with the tubing 50.

Specifically, the rod-less oil production system of the serial submersible linear motor further comprises a plurality of connecting wires 90, and the plurality of motors 10 are electrically connected through the connecting wires 90. By so arranging, the connection stability between the plurality of motors 10 can be effectively ensured.

It should also be noted that, in an embodiment of the present application, in order to improve the pressure resistance of the pump, reduce the pump leakage during the pumping process, increase the length of the seal section of the pump, and increase the length of the plunger assembly 40 and the pump barrel assembly 30 by 600mm compared with the conventional pump.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the problem that the thrust of the submersible linear motor in the prior art cannot meet the requirement of the penetration depth is effectively solved;

2. the performance is stable;

3. the structure is simple.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.