Annular valve type thick oil pump

Abstract

The utility model provides an annular valve type thick oil extraction pump which comprises a first pump cylinder, a second pump cylinder arranged in the first pump cylinder and a plunger concentrically arranged in the first pump cylinder and the second pump cylinder, an annular valve seat is arranged on the inner wall of the first pump cylinder, and the annular valve seat is arranged on the inner wall of the second pump cylinder. The annular valve type thick oil pump further comprises a valve connector which is connected outside the plunger in a sleeved mode and matched with the annular valve seat.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas field development, in particular to an annular valve type thickening pump. Background Art

[0002] With the increasing water content of oil, geological requirements for increasing production pressure differentials, liquid extraction, and gas injection for recovery are increasing. Daily liquid volumes exceeding 150 cubic meters are required. Currently, large-scale rod pumps for liquid extraction in the Tahe Oilfield primarily utilize large-displacement, cross-bridge feedback pumps with 83 / 32mm and 95 / 32mm diameters for pumping wells. However, these pumps experience significant leakage from the annular flow channel outside the small pump barrel during production, resulting in low pump efficiency.

[0003] Therefore, it is desired in the art to provide an annular valve type thickening pump that can meet the large-volume liquid extraction and gas injection requirements of oil wells while reducing pump leakage and improving pump efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide an annular valve type thickening pump, which effectively reduces the oil leakage during the plunger's downstroke by arranging a mutually matching annular valve seat and a valve joint in a first pump barrel.

[0005] According to the utility model, an annular valve type thickening pump is provided, comprising a first pump barrel,

[0006] a second pump barrel disposed within the first pump barrel, and

[0007] plungers concentrically arranged in the first pump barrel and the second pump barrel,

[0008] Wherein, an annular valve seat is provided on the inner wall of the first pump barrel, and the annular valve type thickening pump further comprises a valve joint sleeved on the outside of the plunger and adapted to the annular valve seat.

[0009] In one embodiment, a friction surface for contacting the plunger is provided on the inner wall of the valve joint, and the plunger is configured to drive the annular valve seat to move upward synchronously via the friction surface.

[0010] In one embodiment, the valve connector includes a flow restriction portion for forming a sealing connection with the annular valve seat, and a guide portion disposed below the flow restriction portion.

[0011] In one embodiment, the annular valve seat is configured as an annular structure, and a flow channel allowing oil to pass through is formed between the annular valve seat and the guide portion.

[0012] In one embodiment, the flow restricting portion is configured as a cone-shaped structure, and an outer diameter of the flow restricting portion gradually increases in a direction away from the guide portion.

[0013] In one embodiment, the plunger includes a first plunger forming a sealing connection with the inner circumferential surface of the first pump barrel, and a second plunger forming a sealing connection with the inner circumferential surface of the second pump barrel, and the valve joint is sleeved on the outside of the second plunger.

[0014] In one embodiment, a plurality of oil outlet valves arranged at intervals along the axial direction are provided in the first plunger.

[0015] In one embodiment, the second pump barrel is fixed in the first pump barrel through a valve seat, and the valve seat is provided with a plurality of through holes arranged at intervals and allowing oil to pass through.

[0016] In one embodiment, the annular valve type thickening pump further includes an outer tube disposed below the first pump barrel, and a bridge pipe disposed between the first pump barrel and the outer tube.

[0017] An extension cylinder is provided below the second pump cylinder, and the extension cylinder is axially within the range of the bridge pipe.

[0018] In one embodiment, a central flow channel allowing oil to enter is formed in the outer tube, and the annular valve type thickening pump further includes a two-way joint that divides the central flow channel into a first channel and a second channel, wherein the first channel is fixedly connected to the extension tube, and a plurality of oil inlet valves arranged at intervals along the axial direction are provided in the second channel.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] Firstly, the utility model arranges an annular valve seat and a valve joint that cooperate with each other in the first pump barrel, thereby effectively reducing the leakage of oil when the plunger is in the downstroke.

[0021] In other words, during the downstroke, the second plunger descends, and the valve joint rapidly descends under the pressure built up in the upper chamber until the flow restriction contacts the annular valve seat, forming a sealed connection. At this point, the flow passage formed between the annular valve seat and the guide portion is closed, preventing oil from flowing downward through the passage. This effectively reduces oil loss during the stroke, further improving the efficiency and quality of the annular valve thickening pump.

[0022] Secondly, with the increasing water content year by year, the geological demand for amplifying production pressure difference, lifting liquid and injecting gas for three recovery is gradually increasing. The demand for large-displacement bridge feedback annular valve type thickening pump is increasing. This device has the ability to reduce oil leakage, so it has great prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0024] Figure 1 The schematic diagram shows the upstroke of the annular valve type thickening pump according to the present invention;

[0025] Figure 2 The diagram schematically shows the downstroke of the annular valve type thickening pump according to the present invention;

[0026] Figure 3 The structure of the valve joint in the annular valve type thickening pump according to the utility model is schematically shown;

[0027] Figure 4 The structure of the annular valve seat in the annular valve type thickening pump according to the utility model is schematically shown.

[0028] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0029] To make the technical solutions and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, and are not exhaustive. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 The schematic diagram shows the upstroke of the annular valve type thickening pump 100 according to the present invention;

[0032] Figure 2 The diagram schematically shows the downstroke of the annular valve type thickening pump 100 according to the present invention.

[0033] like Figures 1-2 As shown, the annular valve-type thickening pump 100 according to the present invention mainly includes a first pump barrel 11, a second pump barrel 12 disposed within the first pump barrel 11, and plungers arranged concentrically within the first pump barrel 11 and the second pump barrel 12. Preferably, the plungers include a first plunger 41 and a second plunger 42 disposed below the first plunger 41, wherein the outer circumferential surface of the first plunger 41 forms a sealed connection with the inner circumferential surface of the first pump barrel 11; and the outer circumferential surface of the second plunger 42 forms a sealed connection with the inner circumferential surface of the second pump barrel 12. Therefore, oil extraction can be completed by the axial reciprocating motion of the plungers within the first pump barrel 11 and the second pump barrel 12.

[0034] In one embodiment, Figures 1-2 As shown, a plurality of oil delivery valves 411 are provided inside the first plunger 41 at intervals along the axial direction. Preferably, the oil delivery valves 411 are closed during the upstroke and open during the downstroke, so that the flow of oil in the first pump barrel 11 can be controlled by the oil delivery valves 411.

[0035] Figure 3 The structure of the valve joint 30 in the annular valve type thickening pump according to the present invention is schematically shown;

[0036] Figure 4 The structure of the annular valve seat 21 in the annular valve type thickening pump according to the present invention is schematically shown.

[0037] In one embodiment, Figures 1 to 4 As shown, an annular valve seat 21 is provided on the inner wall of the first pump barrel 11. Preferably, the annular valve seat 21 is securely mounted within the first pump barrel 11, thereby facilitating cooperation with a valve connector 30 (described below) to reduce oil leakage during the downstroke, as described below.

[0038] In this utility model, if Figures 1 to 4 As shown, the annular valve type thickening pump 100 further includes a valve connector 30 sleeved on the outside of the plunger. Preferably, the valve connector 30 is sleeved on the outside of the second plunger 42, and the valve connector 30 can abut against the annular valve seat 21 during the downstroke to form a sealed connection, further reducing oil leakage.

[0039] According to the utility model, if Figures 3-4 As shown, the valve connector 30 includes a flow restrictor 31 and a guide portion 32 disposed below the flow restrictor 31. Preferably, the annular valve seat 21 is configured as an annular structure, and the guide portion 32 is configured as a hollow cylindrical structure. Therefore, the annular valve seat 21 can be sleeved onto the exterior of the guide portion 32, and a flow passage 211 is formed between the annular valve seat 21 and the guide portion 32 to allow oil to pass through. Thus, by controlling the opening and closing of the flow passage 211, the present application can effectively reduce oil leakage during the downstroke.

[0040] In one embodiment, a friction surface is formed on the inner wall of the valve connector 30. Therefore, during the upward stroke, the second plunger 42 can drive the valve connector 30 via the friction surface to achieve synchronous upward movement. At the same time, the flow passage 211 formed between the annular valve seat 21 and the guide portion 32 will be opened, and oil can move upward through the flow passage 211 and enter the upper chamber, thereby facilitating subsequent oil pumping. The upper chamber in the present invention is the annular cavity above the annular valve seat 21 in the first pump barrel 11.

[0041] Preferably, the flow restriction portion 31 is configured as a cone, and its outer diameter gradually increases in the direction away from the guide portion 32. Therefore, during the upstroke, the oil can quickly flow upward under the guidance of the flow restriction portion 31, further improving the operating efficiency and quality of the annular valve type thickening pump 100. During the downstroke, the flow restriction portion 31 abuts the annular valve seat 21 to form a sealed connection, thereby effectively blocking the flow passage 211 and further reducing oil leakage.

[0042] In the present utility model, Figure 1 During the upward stroke, the second plunger 42 moves upward and drives the valve connector 30 via the friction surface to achieve synchronous upward movement. At this time, the flow passage 211 formed between the annular valve seat 21 and the guide portion 32 is opened, and the oil passes through the flow passage 211 and rapidly moves upward under the guidance of the flow restriction portion 31.

[0043] In the present utility model, Figure 2 During the downstroke, the second plunger 42 descends, and the valve connector 30 rapidly descends under the pressure built up in the upper chamber until the flow restriction 31 abuts the annular valve seat 21, forming a sealed connection. At this point, the flow passage 211 formed between the annular valve seat 21 and the guide portion 32 is closed, preventing oil from flowing downward through the flow passage 211 and allowing it to move only upward through the first plunger 41. This effectively reduces oil loss during the stroke, further improving the operating efficiency and quality of the annular valve-type thickening pump 100.

[0044] In one embodiment of the present invention, the second pump barrel 12 is fixedly mounted on the inner wall of the first pump barrel 11 via a valve seat 22. The valve seat 22 is provided with a plurality of spaced-apart through-holes 221 that allow oil to pass through. This arrangement not only ensures the securement of the second pump barrel 12 within the first pump barrel 11, further improving the stability and safety of the annular valve-type thickening pump 100 during downhole operation, but also enhances the fluidity of the oil within the first pump barrel 11, further enhancing the operating efficiency and quality of the annular valve-type thickening pump 100.

[0045] In one embodiment, Figures 1-2 As shown, the annular valve-type thickening pump 100 further includes an outer tube 15 disposed below the first pump barrel 11, and a two-way joint 16 disposed within the outer tube 15. Preferably, a central flow channel is formed within the outer tube 15 to allow oil to enter, and the two-way joint 16 divides the central flow channel into two channels, namely, a first channel 17 and a second channel 18, for oil circulation. This effectively improves the operating efficiency and quality of the annular valve-type thickening pump 100.

[0046] In one embodiment, Figures 1-2As shown, the annular valve-type thickening pump 100 further includes a bridge pipe 14 disposed between the first pump barrel 11 and the outer tube 15. Preferably, an extension tube 121 is provided below the second pump barrel 12, and the extension tube 121 is axially within the bridge pipe 14. This creates a flow divider under the action of the extension tube 121, whereby the oil in the first channel 17 flows through the interior of the extension tube 121, while the oil in the second channel 18 flows through the exterior of the extension tube 121.

[0047] Preferably, the outer tube 15 forms a stable connection with the bridge pipe 14 and the extension tube 121 through the two-way joint 16, thereby ensuring the safety and firmness of the annular valve type thickening pump 100 in underground operation.

[0048] In one embodiment, Figures 1-2 As shown, a plurality of oil inlet valves 181 are provided in the second passage 18 at intervals along the axial direction. Preferably, the oil inlet valves 181 are open during the upstroke and closed during the downstroke, thereby controlling the flow of oil in the outer cylinder 15 through the oil inlet valves 181.

[0049] Preferably, if Figures 1-2 As shown, a first coupling 51 is provided at the top end of the first pump barrel 11; a second coupling 52 is provided at the bottom end of the outer tube 15. In the present invention, the first coupling 51 and the second coupling 52 can be used to connect downhole tools.

[0050] This device reduces downstroke leakage in large-capacity, cross-bridge feedback annular valve-type thickener pumps, significantly improving pump efficiency from 65% to 82%. This pump has been successfully used in 13 wells at our facility, with an average daily fluid production of 148 tons and oil production of 18 tons per well. This represents an increase of 3.8 tons per well compared to previous production levels, resulting in an additional net benefit of 7,471 yuan per day per well. Furthermore, with the increasing water content of oilfield development, geological requirements for increased production differential pressure, fluid extraction, and gas injection for tertiary recovery are increasing, leading to a growing demand for large-capacity, cross-bridge feedback annular valve-type thickener pumps. It is expected to be used in eight wells annually, increasing oil production by 5,000 tons and generating 9.83 million yuan in benefits. This device has great potential for widespread application.

[0051] Compared with the prior art, the advantages of the present invention are:

[0052] Firstly, the present invention arranges the annular valve seat 21 and the valve joint 30 that cooperate with each other in the first pump barrel 11, thereby effectively reducing the leakage of oil when the plunger is in the downstroke.

[0053] In other words, during the downstroke, the second plunger 42 descends, and the valve connector 30 rapidly descends under the pressure built up in the upper chamber until the flow restriction 31 abuts the annular valve seat 21, forming a sealed connection. At this point, the flow passage 211 formed between the annular valve seat 21 and the guide portion 32 is closed, preventing oil from flowing downward through the flow passage 211. This effectively reduces oil loss during the stroke, further improving the operating efficiency and quality of the annular valve-type thickening pump 100.

[0054] Secondly, with the increasing water content year by year, the geological demand for amplifying production pressure difference, lifting liquid and injecting gas for three recovery is gradually increasing. The demand for large-displacement bridge feedback annular valve type thickening pump is increasing. This device has the ability to reduce oil leakage, so it has great prospects for promotion and application.

[0055] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0056] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components.

[0057] For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0058] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art may easily make changes or modifications within the scope disclosed herein, and such changes or modifications shall be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A ring valve type thickening pump, characterized in that: include: The first pump barrel (11), a second pump barrel (12) disposed within the first pump barrel (11), and The plungers are concentrically arranged in the first pump barrel (11) and the second pump barrel (12), An annular valve seat (21) is provided on the inner wall of the first pump barrel (11), and the annular valve type thickening pump further comprises a valve connector (30) sleeved on the outside of the plunger and adapted to the annular valve seat (21).

2. The annular valve type thickening pump according to claim 1, characterized in that: A friction surface for contacting the plunger is provided on the inner wall of the valve joint (30), and the plunger is configured to be able to drive the annular valve seat (21) to move upward synchronously via the friction surface.

3. The annular valve type thickening pump according to claim 2, characterized in that: The valve joint (30) comprises a flow limiting portion (31) for forming a sealed connection with the annular valve seat (21), and a guide portion (32) arranged below the flow limiting portion (31).

4. The annular valve type thickening pump according to claim 3, characterized in that: The annular valve seat (21) is configured as an annular structure, and a flow passage (211) allowing oil to pass through is formed between the annular valve seat (21) and the guide portion (32).

5. The annular valve type thickening pump according to claim 4, characterized in that: The flow limiting portion (31) is configured as a conical structure, and the outer diameter of the flow limiting portion (31) gradually increases in a direction away from the guide portion (32).

6. The annular valve type thickening pump according to claim 1, characterized in that: The plunger comprises a first plunger (41) forming a sealed connection with the inner circumferential surface of the first pump barrel (11), and a second plunger (42) forming a sealed connection with the inner circumferential surface of the second pump barrel (12), and the valve connector (30) is sleeved on the outside of the second plunger (42).

7. The annular valve type thickening pump according to claim 6, characterized in that: A plurality of oil outlet valves (411) are arranged in the first plunger (41) at intervals along the axial direction.

8. The annular valve type thickening pump according to claim 1, characterized in that: The second pump barrel (12) is fixed in the first pump barrel (11) via a valve seat (22), and the valve seat (22) is provided with a plurality of through holes (221) arranged at intervals and allowing oil to pass through.

9. The annular valve type thickening pump according to claim 8, characterized in that: The annular valve type thickening pump further comprises an outer tube (15) arranged below the first pump barrel (11), and a bridge tube (14) arranged between the first pump barrel (11) and the outer tube (15). An extension cylinder (121) is provided below the second pump cylinder (12), and the extension cylinder (121) is axially located within the range of the bridge pipe (14).

10. The annular valve type thickening pump according to claim 9, characterized in that: A central flow channel for allowing oil to enter is formed in the outer tube (15). The annular valve type thickening pump further includes a two-way joint (16) for dividing the central flow channel into a first channel (17) and a second channel (18). The first channel (17) is fixedly connected to the extension tube (121), and a plurality of oil inlet valves (181) arranged at intervals along the axial direction are provided in the second channel (18).

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