Anti-gas sand thickening pump

Abstract

The present invention relates to an anti-gas sand pumping pump, which belongs to the field of oil production tools, including a large pump barrel, the interior of the large pump barrel is divided into an upper space and a lower space by a partition device, and the partition device is provided with a one-way valve flowing from the lower space to the upper space; a large plunger arranged in the upper space of the large pump barrel, the outer wall of the large plunger and the inner wall of the large pump barrel are slidingly sealed, and a flow channel is arranged in the middle of the large plunger; and a pull rod device arranged in the large pump barrel, the upper part of the pull rod device passes through the flow channel, and the lower part thereof slides and seals through the partition device and extends into the lower space; wherein the pull rod device drives the large plunger to move back and forth in the vertical direction, is sealedly connected to the large plunger during the ascending process, and is non-sealedly connected to the large plunger during the descending process. The present invention adopts a valveless design to achieve the purpose of preventing gas and sand.

Description

Technical Field

[0001] The invention relates to an anti-gas sand thickening pump, belonging to the field of petroleum exploitation. Background Art

[0002] The existing conventional oil pump opens the floating valve to discharge the liquid during the plunger downstroke, but the valve needs starting pressure to open. When the gas content in the pump barrel is large, the valve will be delayed or even unable to open due to the compressibility of the gas, which reduces the pump efficiency and even causes gas lock. Therefore, the existing oil pump is affected by the gas in the thickening pump, thereby affecting the filling degree of the thickening pump. Summary of the invention

[0003] In view of the above problems, the present invention proposes an anti-gas and sand thickening pump, which adopts a valve-free design to achieve the purpose of preventing gas and sand.

[0004] The present invention proposes an anti-gas sand thickening pump, comprising:

[0005] A large pump barrel, the interior of which is divided into an upper space and a lower space by a partition device, and a one-way valve for flowing from the lower space to the upper space is provided on the partition device;

[0006] A large plunger is arranged in the upper space of the large pump barrel, the outer wall of the large plunger is arranged in a sliding seal with the inner wall of the large pump barrel, and a flow channel is arranged in the middle of the large plunger; and

[0007] A pull rod device is arranged in the large pump barrel, the upper part of the pull rod device passes through the flow channel, and the lower part thereof slides and seals through the partition device and extends into the lower space;

[0008] The pull rod device drives the large plunger to move back and forth in the vertical direction, is sealedly connected to the large plunger during the ascending process, and is non-sealedly connected to the large plunger during the descending process.

[0009] A further improvement of the present invention is that a small pump barrel is sleeved inside the large pump barrel, and the upper end of the small pump barrel is fixedly connected to the partition device; a small plunger is provided at the lower end of the pull rod device, and the small plunger is sealingly and slidably connected to the small pump barrel.

[0010] A further improvement of the present invention is that a limiting ring groove is provided in the flow channel of the large plunger; a limiting device is provided on the pull rod device;

[0011] Wherein, the limiting device is limited in the limiting ring groove.

[0012] A further improvement of the present invention is that a sealing ring is provided on the pull rod device, and the sealing ring cooperates with the lower part of the large plunger; wherein, when the pull rod device moves upward, the sealing ring is in sealing contact with the large plunger; when the pull rod device moves downward, the sealing ring is separated from the large plunger.

[0013] A further improvement of the present invention is that the limiting device is a columnar structure, and there is non-sealed contact between the limiting device and the limiting ring groove.

[0014] A further improvement of the present invention is that the limiting device comprises a plurality of sealing blocks arranged along the circumference of the pull rod device.

[0015] A further improvement of the present invention is that both the upper end and the lower end of the large plunger are provided with anti-scratch structures.

[0016] A further improvement of the present invention is that a support plate is provided in the lower space of the large pump barrel, the support plate is connected to the lower portion of the small pump barrel, and a side suction port is provided on the support plate at a position opposite to the one-way valve.

[0017] A further improvement of the present invention is that the one-way valve comprises a hole provided on the partition device, and an inverted T-type limit ball valve fixed on the large pump barrel;

[0018] Wherein, a valve is arranged between the inverted T-type limit ball valve and the hole.

[0019] A further improvement of the present invention is that an upper joint is provided at the upper end of the large pump barrel, and a lower joint is provided at the lower end thereof; and a protruding side arc plate is provided on the side wall of the middle portion of the large pump barrel.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The gas and sand proof thickening pump of the present invention adopts a valve-free mechanical opening and closing plunger to solve the problem that the valve requires a minimum opening and closing pressure to affect the pump efficiency. At the same time, a sand proof device is designed on the plunger to reduce the influence of gas and sand, improve pump efficiency, reduce failures, and expand the adaptability of the thickening pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an air sand prevention thickening pump according to an embodiment of the present invention, showing the structure of a cylindrical sealing ring;

[0023] Figure 2 is a schematic structural diagram of an air sand prevention thickening pump according to an embodiment of the present invention, showing the structure of a conical or umbrella-shaped sealing ring;

[0024] Figure 3is a schematic structural diagram of a limiting device according to an embodiment of the present invention, showing the structure of a block-shaped limiting device;

[0025] Figure 4 Schematic diagram of the cross-sectional structure of a limiting device according to an embodiment of the present invention.

[0026] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0027] The meanings of the various figure marks in the accompanying drawings are as follows: 1. large pump barrel, 2. large plunger, 3. pull rod device, 4. small pump barrel, 11. partition device, 12. upper space, 13. lower space, 14. one-way valve, 15. inverted T-type limit ball valve, 16. valve, 17. side arc plate, 18. upper joint, 19. lower joint, 21. flow channel, 22. limit ring groove, 23. anti-scratch structure, 31. limit device, 32. sealing ring, 33. small plunger, 41. support plate, 42. side suction port. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 The anti-gas sand pumping thickener according to one embodiment of the present invention is schematically shown. The anti-gas sand pumping thickener according to the present invention particularly adopts a valve-free design to achieve the purpose of preventing gas and sand.

[0030] Figure 1 The anti-gas sand pumping thickening pump according to one embodiment of the present invention is schematically shown, which includes a large pump barrel 1. The large pump barrel 1 is preferably a cylindrical structure, and a partition device 11 is arranged inside it. The partition device 11 is arranged horizontally in the large pump barrel 1, and the partition device 11 divides the internal space of the large pump barrel 1 into an upper space 12 and a lower space 13. A one-way valve 14 is arranged on the partition device 11, and the flow direction of the one-way valve 14 is from the lower space 13 to the upper space 12. The anti-gas sand pumping thickening pump described in this embodiment also includes a large plunger 2, which is a cylindrical structure, and its outer wall is slidingly sealed with the inner wall of the large pump barrel 1, and a flow channel 21 is arranged in the middle of the large plunger 2. The space between the large plunger 2 and the partition device 11 forms a pump chamber. The pull rod device 3 in the large pump barrel 1 can reciprocate in the vertical direction. The upper part of the pull rod device 3 passes through the flow channel 21, and the lower part thereof slides and seals through the partition device 11 and extends into the lower space 13. The pull rod device 3 drives the large plunger 2 to move back and forth in the vertical direction, and is sealedly connected to the large plunger 2 during the ascending process, and is non-sealedly connected to the large plunger 2 during the descending process.

[0031] When using the anti-gas and sand pumping pump according to the present embodiment, when the pull rod device 3 moves upward, the pull rod device 3 is tightly connected to the large plunger 2, thereby pulling the large plunger 2 to move upward. At this time, the volume of the pump chamber between the large plunger 2 and the separator 11 increases, the pressure decreases, and the oil enters from the lower part of the large pump barrel 1 through the one-way valve 14 and enters the pump chamber. When the pull rod device 3 moves downward, the pull rod device 3 is non-sealedly connected to the large plunger 2, and drives the large plunger 2 to move downward. At this time, the volume of the pump chamber between the large plunger 2 and the separator 11 decreases, the pressure increases, and the oil flows upward through the flow channel 21 of the large plunger 2. This completes the process of pumping oil. This embodiment pumps oil by means of the large plunger 2, and adopts a design without valve 16, thereby achieving the purpose of preventing gas and sand.

[0032] In one embodiment, a small pump barrel 4 is sleeved inside the large pump barrel 1, and the small pump barrel 4 is a cylindrical structure. In this embodiment, the upper end of the small pump barrel 4 is fixedly connected to the partition device 11, which connects the upper space 12 and the lower space 13 of the large pump barrel 1. A small plunger 33 is provided at the lower end of the pull rod device 3, and the small plunger 33 is inserted into the small pump barrel 4 and is sealed and slidably connected to the small pump barrel 4.

[0033] In a preferred embodiment, a limiting annular groove 22 is provided on the inner wall of the flow channel 21 of the large plunger 2, and a limiting device 31 is provided on the pull rod, and the limiting device 31 is limited in the limiting annular groove 22. The height of the limiting annular groove 22 is greater than the height of the limiting device 31. When the pull rod device 3 moves upward, the limiting device 31 moves upward with the main body of the pull rod device 3. When the limiting device 31 moves to the top of the limiting annular groove 22, the large plunger 2 is pushed to move upward due to the cooperation between the limiting device 31 and the limiting annular groove 22. When the pull rod device 3 moves downward, the limiting device 31 moves downward with the main body of the pull rod device 3. When the limiting device 31 moves to the bottom of the limiting annular groove 22, the large plunger 2 is pushed to move downward due to the cooperation between the limiting device 31 and the limiting annular groove 22.

[0034] In one embodiment, a sealing ring 32 is provided on the pull rod device 3, and the sealing ring 32 cooperates with the lower part of the large plunger 2. When the pull rod device 3 moves upward, the sealing ring 32 is in sealing contact with the large plunger 2; when the pull rod device 3 moves downward, the sealing ring 32 is separated from the large plunger 2.

[0035] In the anti-gas sand pump according to this embodiment, the sealing ring 32 may be a circular ring structure, such as Figure 1 As shown, the outer ring of the sealing ring 32 matches the inner wall of the flow channel 21, and when the pull rod device 3 moves upward, the sealing ring 32 enters the flow channel 21. At this time, the sealing ring 32 cooperates with the flow channel 21 to complete the sealing.

[0036] The structure of the sealing ring 32 can also be a conical or umbrella-shaped structure, matching the shape of the lower end of the large plunger 2, such as Figure 2 As shown, the upper end face of the sealing ring 32 matches the lower end face of the large plunger 2, and when the pull rod device 3 moves upward, the sealing ring 32 contacts and adheres to the large plunger 2. At this time, the sealing ring 32 cooperates with the end face of the large plunger 2 to complete the sealing.

[0037] In one embodiment, the limiting device 31 is a columnar structure, preferably a cylindrical structure. An annular space is formed between the outer wall of the limiting device 31 and the inner wall of the limiting ring groove 22. The limiting device 31 is in non-sealed contact with the limiting ring groove 22. When the pull rod device 3 moves downward, the sealing ring 32 and the large plunger 2 are separated, and the oil enters the flow channel 21 and flows out through the annular space between the limiting device 31 and the limiting ring groove 22.

[0038] In a preferred embodiment, at least one oil circulation channel is provided on the limit device 31 for circulating oil. The setting mode of the oil circulation channel can be set according to actual needs, as long as it can ensure that the oil can flow into the limit device 31 and the annular space of the limit groove when the oil cannot flow through the limit device 31. Preferably, the oil circulation channel can be axially arranged on the annular area of ​​the limit device 31. In another mode, the oil circulation channel can be a groove arranged on the outer surface of the limit device 31.

[0039] In a preferred embodiment, Figure 3 As shown, the limiting device 31 includes a plurality of sealing blocks, which are evenly arranged on the circumference of the pull rod device 3. The sealing blocks can be fan-shaped blocks, square blocks, conical blocks or block structures of other shapes. The oil can flow out through the gaps between the sealing blocks.

[0040] In one embodiment, the upper and lower ends of the large plunger 2 are both provided with an anti-scratch structure 23. The anti-scratch structure 23 is a structure of a tapered hole formed by a bevel, the end of the bevel is connected to the outer edge of the top plunger, and the inner edge of the bevel is connected to the part of the internal flow channel 21. In this way, the bevel structure can prevent scratching and hinder the movement of the large plunger 2.

[0041] In one embodiment, the large pump barrel 1 is further provided with a support plate 41, and the support plate 41 is located in the lower space 13. The support plate 41 is arranged horizontally and arranged in parallel with the partition device 11 at a certain distance. The support plate 41 is connected to the lower part of the small pump barrel 4, and the lower part of the small pump barrel 4 passes through the support plate 41. The upper part of the small pump barrel 4 is fixed by the partition device 11, and the lower part is fixed by the support plate 41. In this embodiment, a side suction port 42 is arranged on the support plate 41 at the position of the one-way valve 14 of the partition device 11.

[0042] When the anti-gas sand pumping thickening pump according to this embodiment is used, the lower part of the small pump barrel 4 can be fixed by providing a support plate 41. The upper part of the small pump barrel 4 is fixed by the partition device 11, and the lower part is fixed by the support plate 41, which can keep it stable. It can always keep stable during the impact of the small plunger 33.

[0043] In one embodiment, the one-way valve includes a hole arranged on the partition device 11, and an inverted T-type limit ball valve 15 fixed on the large pump barrel 1. The inverted T-type limit ball valve 15 is a T-shaped or umbrella-shaped structure and can be retracted. In this embodiment, a valve 16 is arranged between the inverted T-type limit ball valve 15 and the hole.

[0044] In one embodiment, the upper end of the large pump barrel 1 is provided with an upper joint 18 for connecting upstream devices; the lower end thereof is provided with a lower joint 19 for connecting downstream equipment. The side wall of the middle portion of the large pump barrel 1 is provided with a protruding side arc plate 17 to increase the flow of the side suction port 42 and the one-way valve 14.

[0045] When using the anti-gas sand pump according to the present embodiment, first, the large plunger 2 is at the bottom of the large pump barrel 1, the limit device 31 and the sealing ring 32 on the pull rod device 3 are at the bottom, the pull rod device 3 and the small plunger 33 move upward at the same time, and drive the sealing ring 32 upward at the same time, the sealing ring 32 contacts and seals with the large plunger 2 and moves upward, the pressure in the pump chamber is reduced, the one-way valve 14 opens, and the crude oil and mixed gas enter the pump chamber from the side suction port 42. When the highest point of the upstroke is reached, the pump chamber is filled with the maximum amount of crude oil, the upstroke ends, and the crude oil suction function is completed.

[0046] At the beginning of the downstroke, the large plunger 2 is at the uppermost end of the large pump barrel 1, the rod device 3 and the small plunger 33 move downward at the same time, the sealing ring 32 is forced to separate from the large plunger 2, the oil discharge channel is opened, and at the same time, the rod limit device 31 moves downward to drive the large plunger 2 to compress the crude oil and mixed gas in the pump chamber, the one-way valve 14 is closed, and the crude oil is discharged from the annulus between the large plunger 2 and the rod device 3 until the lowest point of the downstroke. The downstroke ends, completing the oil discharge function of the pump chamber, and this cycle is repeated, thereby realizing the oil production function of the thickening pump.

[0047] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gas sand pump, characterized in that: include: A large pump barrel (1), the interior of the large pump barrel (1) being divided into an upper space (12) and a lower space (13) by a partition device (11), and a one-way valve (14) for allowing water to flow from the lower space (13) to the upper space (12) being provided on the partition device (11); A large plunger (2) is arranged in the upper space (12) of the large pump barrel (1), the outer wall of the large plunger (2) is arranged in a sliding seal with the inner wall of the large pump barrel (1), and a flow channel (21) is arranged in the middle of the large plunger (2); and A pull rod device (3) is arranged in the large pump barrel (1), the upper portion of the pull rod device (3) passes through the flow channel (21), and the lower portion thereof slides and seals through the partition device (11) and extends into the lower space (13); The pull rod device (3) drives the large plunger (2) to move back and forth in the vertical direction, is sealedly connected to the large plunger (2) during the ascending process, and is non-sealedly connected to the large plunger (2) during the descending process; A limiting annular groove (22) is provided in the flow channel (21) of the large plunger (2); a limiting device (31) is provided on the pull rod device (3); wherein the limiting device (31) is limited in the limiting annular groove (22); A sealing ring (32) is provided on the pull rod device (3), and the sealing ring (32) cooperates with the lower part of the large plunger (2). The sealing ring (32) is a circular ring, a cone or an umbrella-shaped structure, and the shape of the lower end of the large plunger (2) matches the sealing ring (32); wherein, when the pull rod device (3) moves upward, the sealing ring (32) is in sealing contact with the large plunger (2); and when the pull rod device (3) moves downward, the sealing ring (32) is separated from the large plunger (2).

2. The anti-gas sand thickening pump according to claim 1, characterized in that: A small pump barrel (4) is sleeved inside the large pump barrel (1), and the upper end of the small pump barrel (4) is fixedly connected to the partition device (11); a small plunger (33) is provided at the lower end of the pull rod device (3), and the small plunger (33) is sealingly and slidably connected to the small pump barrel (4).

3. The anti-gas sand thickening pump according to claim 2, characterized in that: The limiting device (31) is a columnar structure, and there is non-sealed contact between the limiting device (31) and the limiting ring groove (22).

4. The anti-gas sand thickening pump according to claim 3, characterized in that: The limiting device (31) comprises a plurality of sealing blocks arranged along the circumference of the pull rod device (3).

5. The anti-gas sand thickening pump according to claim 3 or 4, characterized in that: The upper end and the lower end of the large plunger (2) are both provided with anti-scratch structures (23).

6. The anti-gas sand thickening pump according to claim 5, characterized in that: A support plate (41) is provided in the lower space (13) of the large pump barrel (1), the support plate (41) is connected to the lower portion of the small pump barrel (4), and a side suction port (42) is provided on the support plate (41) at a position opposite to the one-way valve (14).

7. The anti-gas sand thickening pump according to claim 6, characterized in that: The one-way valve comprises a hole provided on the partition device (11), and an inverted T-shaped limit ball valve (15) fixed on the large pump barrel (1); Wherein, a valve (16) is provided between the inverted T-shaped limit ball valve (15) and the hole.

8. The anti-gas sand thickening pump according to claim 7, characterized in that: An upper joint (18) is provided at the upper end of the large pump barrel (1), and a lower joint (19) is provided at the lower end thereof; a protruding side arc plate (17) is provided on the side wall of the middle portion of the large pump barrel (1).

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