Permanent magnet bidirectional oil extraction plunger pump

Abstract

The permanent magnet bidirectional oil extraction plunger pump comprises an isolation sleeve and a lower pump cylinder, the bottom end of the isolation sleeve is connected with the top end of the lower pump cylinder, an active permanent magnet device is slidably arranged on the outer wall of the isolation sleeve, a passive permanent magnet device is slidably arranged on the inner wall of the isolation sleeve, and the active permanent magnet device can drive the passive permanent magnet device to move up and down. An upper pump plunger is fixed in the isolation sleeve, an upper pump plunger valve is arranged at the bottom of the upper pump plunger, the bottom end of the upper pump plunger is located in the passive permanent magnet device, an upper pump cylinder bottom valve is arranged at the bottom of the passive permanent magnet device, a lower pump plunger is arranged in the lower pump cylinder, and the lower pump plunger is connected with the passive permanent magnet device through a connecting cylinder. A lower pump plunger valve is arranged at the bottom of the lower pump plunger, and a lower pump cylinder bottom valve is arranged at the bottom end of the lower pump cylinder. The structure can achieve two-way movement oil extraction, and the oil extraction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil field production equipment, in particular to a permanent magnet bidirectional oil production plunger pump. Background Art

[0002] The plunger pumps used in traditional walking beam pumping units are all unidirectional oil production pumps, which are not suitable for rodless reciprocating oil production. The current rodless reciprocating oil production system also uses unidirectional plunger pumps. This structure requires the power system to be able to complete the lifting force of the pump in the upward direction. The downward direction is basically unloaded, resulting in low efficiency of the power system and limited lifting force. Summary of the invention

[0003] In view of the defects in the prior art, the present invention provides a permanent magnet bidirectional oil production plunger pump, which can realize bidirectional oil production and improve oil production efficiency.

[0004] A permanent magnet bidirectional oil production plunger pump comprises an isolation sleeve and a lower pump barrel, wherein the bottom end of the isolation sleeve is connected to the top end of the lower pump barrel, an active permanent magnet device is slidably provided on the outer wall of the isolation sleeve, and a passive permanent magnet device is slidably provided on the inner wall of the isolation sleeve, the active permanent magnet device can drive the passive permanent magnet device to move up and down, an upper pump plunger is fixed in the isolation sleeve, an upper pump plunger valve is provided at the bottom of the upper pump plunger, the bottom end of the upper pump plunger is located in the passive permanent magnet device, an upper pump barrel bottom valve is provided at the bottom of the passive permanent magnet device, a lower pump plunger is provided in the lower pump barrel, the lower pump plunger is connected to the passive permanent magnet device via a connecting tube, a lower pump plunger valve is provided at the bottom of the lower pump plunger, and a lower pump barrel bottom valve is provided at the bottom end of the lower pump barrel.

[0005] Preferably, an annular groove is provided on the inner wall of the isolation sleeve, the passive permanent magnet device is annular, the outer circumferential wall of the passive permanent magnet device fits the circumferential wall of the annular groove, and the outer circumferential wall of the upper pump plunger contacts the inner circumferential wall of the passive permanent magnet device.

[0006] Preferably, the active permanent magnet device comprises an annular shell and a permanent magnet, the annular shell is sleeved on the isolation sleeve, and the permanent magnet is arranged in the annular shell.

[0007] Preferably, the outer diameter of the lower pump plunger is larger than the inner diameter of the passive permanent magnet device.

[0008] Preferably, the isolation sleeve is made of non-magnetic material.

[0009] The beneficial effects of the present invention are as follows: the device can realize the function of oil production in both upper and lower strokes through the cooperation of various components, thereby improving oil production efficiency. At the same time, due to the high-intensity magnetic force, the well fluid is magnetized to reduce viscosity, slow down wax deposition, and improve fluidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0011] Figure 1 It is a front cross-sectional view of the passive permanent magnet device in the present invention when it moves to the lowest point;

[0012] Figure 2 This is a front cross-sectional view of the passive permanent magnet device in the present invention when it moves to the highest point.

[0013] In the accompanying drawings, 1-isolating sleeve, 2-active permanent magnetic device, 3-passive permanent magnetic device, 4-upper pump plunger, 5-upper pump plunger valve, 6-upper pump barrel bottom valve, 7-connecting barrel, 8-lower pump plunger, 9-lower pump barrel, 10-lower pump plunger valve, 11-lower pump barrel bottom valve. DETAILED DESCRIPTION

[0014] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0015] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0016] Example 1

[0017] like Figure 1-Figure 2 As shown, a permanent magnet bidirectional oil production plunger pump is provided in this embodiment, including an isolation sleeve 1 and a lower pump barrel 9, the bottom end of the isolation sleeve 1 is connected to the top end of the lower pump barrel 9, the outer wall of the isolation sleeve 1 is slidably provided with an active permanent magnet device 2, and the inner wall of the isolation sleeve 1 is slidably provided with a passive permanent magnet device 3, the active permanent magnet device 2 can drive the passive permanent magnet device 3 to move up and down, an upper pump plunger 4 is fixed in the isolation sleeve 1, an upper pump plunger valve 5 is provided at the bottom of the upper pump plunger 4, the bottom end of the upper pump plunger 4 is located in the passive permanent magnet device 3, an upper pump barrel bottom valve 6 is provided at the bottom of the passive permanent magnet device 3, a lower pump plunger 8 is provided in the lower pump barrel 9, the lower pump plunger 8 is connected to the passive permanent magnet device 3 through a connecting tube 7, a lower pump plunger valve 10 is provided at the bottom of the lower pump plunger 8, and a lower pump barrel bottom valve 11 is provided at the bottom of the lower pump barrel 9.

[0018] In this embodiment, the outer wall of the lower pump plunger 8 is in contact with the inner wall of the lower pump barrel 9 .

[0019] In this embodiment, through the cooperation of various components, the specific working principle is as follows:

[0020] When the oil production system performs an upstroke operation, the passive permanent magnetic device 3 is at the lowest point, the upper pump barrel bottom valve 6 and the lower pump plunger valve 10 are closed, the upper pump plunger valve 5 and the lower pump barrel bottom valve 11 are opened, and the oil production system drives the active permanent magnetic device 2 to move upward, and the active permanent magnetic device 2 drives the passive permanent magnetic device 3, the connecting tube 7 and the lower pump plunger 8 to move upward, the distance between the upper pump plunger valve 5 and the upper pump barrel bottom valve 6 is shortened, and the well fluid between the upper pump barrel bottom valve 6 and the lower pump plunger valve 10 remains unchanged, and the well fluid between the upper pump plunger valve 5 and the upper pump barrel bottom valve 6 is pushed upward into the upper pump plunger 4 to push the well fluid in the upper plunger 4 upward, thereby realizing upstroke operation oil production, and during the upward movement, the distance between the lower pump plunger valve 10 and the lower pump barrel bottom valve 11 gradually increases, and the well fluid enters the lower pump barrel 9 through the lower pump barrel bottom valve 11.

[0021] During the upward movement, the volume of liquid entering through the bottom valve 11 of the lower pump barrel is greater than the volume of liquid discharged through the upper pump plunger 4. Specifically, the volume of liquid entering through the bottom valve 11 of the lower pump barrel is twice the volume discharged through the upper pump plunger 4.

[0022] The specific implementation structure is that the outer diameter of the lower pump plunger 8 in this embodiment is larger than the inner diameter of the passive permanent magnet device 3. The space vacated by the upward movement of the lower pump plunger 8 during the upward process is the volume of the liquid entering through the lower pump barrel bottom valve 11. The volume of the space between the upper pump plunger valve 5 and the upper pump barrel bottom valve 6 squeezed by the upward movement of the inner cavity of the passive permanent magnet device 3 is the volume of the discharged liquid. Since the lower pump plunger 8 and the passive permanent magnet device 3 move as a whole, when the outer diameter of the lower pump plunger 8 is larger than the inner diameter of the passive permanent magnet device 3, it can be achieved that the volume of the liquid entering through the lower pump barrel bottom valve 11 during the upward process is greater than the volume of the liquid discharged through the upper pump plunger 4.

[0023] When the oil production system performs a downstroke operation, the passive permanent magnetic device 3 is at the highest point, the distance between the upper pump plunger valve 5 and the upper pump barrel bottom valve 6 is the smallest, and the distance between the lower pump plunger valve 10 and the lower pump barrel bottom valve 11 is the largest. The upper pump barrel bottom valve 6, the lower pump plunger valve 10 and the upper pump plunger valve 5 are open, and the lower pump barrel bottom valve 11 is closed.

[0024] The oil production system drives the active permanent magnet device 2 to move downward, and the active permanent magnet device 2 drives the passive permanent magnet device 3, the connecting tube 7 and the lower pump plunger 8 to move downward. The liquid between the lower pump plunger valve 10 and the lower pump barrel 11 enters the lower pump plunger 8 through the lower pump plunger valve 10, and the well fluid in the lower pump plunger 8 is pushed upward through the connecting tube 7, filling the space between the upper pump plunger valve 5 and the upper pump barrel bottom valve 6, and the remaining well fluid is discharged through the upper pump plunger 4.

[0025] The device can realize the function of oil production in both upper and lower strokes. At the same time, due to the high-intensity magnetic force, the well fluid is magnetized to reduce the viscosity, slow down the wax deposition speed, and improve the fluidity.

[0026] In this embodiment, the inner wall of the isolation sleeve 1 is provided with an annular groove, the passive permanent magnet device 3 is annular, the outer circumferential wall of the passive permanent magnet device 3 is fitted to the circumferential wall of the annular groove, and the outer circumferential wall of the upper pump plunger 4 is in contact with the inner circumferential wall of the passive permanent magnet device 3, so that the passive permanent magnet device 3 is slidably set on the inner wall of the isolation sleeve 1.

[0027] In this embodiment, the active permanent magnet device 2 includes an annular shell and a permanent magnet. The annular shell is sleeved on the isolation sleeve 1, and the permanent magnet is arranged in the annular shell, so that the active permanent magnet device 2 is slidably arranged on the outer wall of the isolation sleeve 1.

[0028] In this embodiment, the isolation sleeve 1 is made of non-magnetic material. In this embodiment, the passive permanent magnet device 3 is made of magnetic material.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A permanent magnet bidirectional oil production plunger pump, characterized in that: The invention comprises an isolation sleeve (1) and a lower pump barrel (9), wherein the bottom end of the isolation sleeve (1) is connected to the top end of the lower pump barrel (9), an active permanent magnetic device (2) is slidably provided on the outer wall of the isolation sleeve (1), and a passive permanent magnetic device (3) is slidably provided on the inner wall of the isolation sleeve (1), wherein the active permanent magnetic device (2) can drive the passive permanent magnetic device (3) to move up and down, an upper pump plunger (4) is fixed in the isolation sleeve (1), and an upper A pump plunger valve (5), the bottom end of the upper pump plunger (4) is located in the passive permanent magnet device (3), the bottom of the passive permanent magnet device (3) is provided with an upper pump barrel bottom valve (6), the lower pump plunger (8) is provided in the lower pump barrel (9), the lower pump plunger (8) and the passive permanent magnet device (3) are connected via a connecting tube (7), the bottom of the lower pump plunger (8) is provided with a lower pump plunger valve (10), and the bottom end of the lower pump barrel (9) is provided with a lower pump barrel bottom valve (11).

2. A permanent magnetic bidirectional oil production plunger pump according to claim 1, characterized in that: The inner wall of the isolation sleeve (1) is provided with an annular groove, the passive permanent magnet device (3) is annular, the outer circumferential wall of the passive permanent magnet device is in contact with the circumferential wall of the annular groove, and the outer circumferential wall of the upper pump plunger (4) is in contact with the inner circumferential wall of the passive permanent magnet device (3).

3. A permanent magnetic bidirectional oil production plunger pump according to claim 1, characterized in that: The active permanent magnet device (2) comprises an annular shell and a permanent magnet, wherein the annular shell is sleeved on the isolation sleeve (1), and the permanent magnet is arranged inside the annular shell.

4. A permanent magnetic bidirectional oil production plunger pump according to claim 1, characterized in that: The outer diameter of the lower pump plunger (8) is greater than the inner diameter of the passive permanent magnet device (3).

5. A permanent magnetic bidirectional oil production plunger pump according to claim 1, characterized in that: The isolation sleeve (1) is made of non-magnetic conductive material.

Images