Multifunctional casing gas recovery device suitable for rod-pumped well

Abstract

The utility model discloses a multifunctional casing gas recovery device suitable for a rod pumped well, and relates to the technical field of oil extraction equipment. A casing gas recovery pipeline is arranged on the casing gas recovery device, the separator is connected with the casing gas recovery pipeline through a pipeline, an outlet of the separator is connected with the casing gas recovery device through a pipeline, an embedded anti-freezing and anti-blocking check valve is arranged on the outlet pipeline of the separator, and the check valve is embedded in a clamp head connected with a side production valve. The device is mainly applied to casing gas recovery of remote wells, the complex problems that the working fluid level of an oil well declines, freezing and blocking are prone to occurring in winter, backflow is prevented and the like due to casing gas pressure building of the remote wells can be solved through the ingenious design, and the crude oil yield is increased. By means of the design of the device, precious natural gas resource recovery is guaranteed, atmospheric pollution is avoided, the efficiency and safety of the whole oil gas recovery system are improved, and meanwhile the purpose of effectively and reasonably developing safe and environment-friendly oil gas resources is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production equipment, in particular to a pumping well casing gas recovery device. Background Art

[0002] To save production costs, some oil fields choose not to implement independent casing gas recovery processes for some remote wells. This results in the inability to properly manage and treat the casing gas in these wells. If discharged without authorization, this can cause air pollution. If left undischarged, it can lead to a buildup of gas pressure within the well casing (a phenomenon known as pressure buildup), causing a drop in the well's dynamic liquid level and negatively impacting crude oil production. Furthermore, the well's own gas cannot be effectively developed and utilized, resulting in the unnecessary loss of valuable natural gas resources.

[0003] Furthermore, in winter, casing gas recovery operations face the risk of freezing and blockage, which not only affects recovery efficiency but also poses a potential safety risk. In extreme cases, if freezing and blockage are not promptly and properly addressed, they could escalate into large-scale environmental pollution incidents, posing a serious threat to the ecological environment.

[0004] CN202510093U discloses an oil well casing gas recovery and utilization device. The casing connecting line is equipped with a separator inlet valve, a check valve, and a casing gas pressure gauge. The separator is connected to the casing connecting line and equipped with a separator outlet valve, a pressure gauge, and a vent valve. This device can significantly improve the recovery and utilization rate of oil well casing gas. However, this technical solution has the following drawbacks: it cannot specifically prevent freezing and blockage, and it lacks a backflow prevention mechanism. Utility Model Content

[0005] To reduce the manufacturing costs of building an independent gas recovery process system, this utility model aims to provide a solution to the complex problem of low dynamic liquid levels and reduced production in remote wells due to casing gas pressure buildup. This solution aims to effectively and rationally develop and utilize the gas resources generated by the pumping well itself.

[0006] To achieve the above purpose, the present invention is improved mainly in the following aspects:

[0007] (1) Implement gas-liquid separation technology and configure a waste liquid return system to ensure the effectiveness of winter anti-freeze measures. The casing gas produced by oil wells usually has high humidity. In winter conditions in the north, this high-humidity gas is very likely to cause freezing and blockage of the casing gas collection device. Gas-liquid separation is performed before casing gas recovery to reduce the humidity of the casing gas and prevent freezing and blockage.

[0008] (2) Preventing oil return backflow. To ensure that the device effectively utilizes the oil well return line as a recovery channel for casing gas recovery, it is necessary to solve the problem of reverse flow of produced fluid from the oil well return line into the casing due to factors such as pressure differences.

[0009] (3) Manually adjustable pressure control mechanism. In order to meet the requirements of different oil wells for casing gas recovery pressure, the device needs to be equipped with a structure that is easy to operate and has high precision to adjust the casing gas recovery pressure flexibly and stabilize the casing gas recovery pressure to ensure the efficiency and safety of the recovery process.

[0010] The utility model adopts the following technical solutions:

[0011] The casing gas recovery device is provided with a casing gas recovery pipeline, the separator is connected to the casing gas recovery pipeline through the pipeline, the separator outlet is connected to the casing gas recovery device through the pipeline, and an embedded anti-freeze check valve is provided on the separator outlet pipeline. The check valve is embedded in the clamp head connected to the side production valve.

[0012] Preferably, the embedded anti-freeze blocking one-way valve is embedded in the clamp head connected to the side production valve, the valve body is provided with a valve core, the valve core is provided with an oil inlet channel, the right side of the valve core is provided with a spring, and the right side of the spring is provided with a spring base.

[0013] Preferably, the casing gas recovery device is provided with an oil return valve and a casing liquid injection valve; the casing gas inlet of the casing gas recovery device is provided with a casing gas collection valve and a casing gas recovery pipeline.

[0014] Preferably, the separator is connected to the casing gas recovery pipeline through a pipeline, and a separator inlet control valve is provided on the connecting pipeline.

[0015] Preferably, a pressure control valve is provided on the separator outlet pipeline.

[0016] Preferably, one end of the casing gas recovery pipeline is provided with a screw plug with a test box, and a casing pressure gauge is provided on the screw plug with a test box.

[0017] Preferably, an inclined reversing baffle is provided inside the separator, a guide tube is provided below the reversing baffle and connected to the separator inlet, a central tube is connected to the reversing baffle, and a liquid separation plate is provided below the central tube.

[0018] Preferably, a separator outlet is provided on the separator, a separator pressure test box and a separator pressure gauge are provided on the top of the separator, and a waste liquid outlet is provided at the bottom of the separator.

[0019] Preferably, a pipeline and a casing gas recovery pipeline are provided at the waste liquid discharge outlet, a liquid discharge pressure regulating valve is provided on the pipeline, and a separator vent valve is provided at the waste liquid discharge outlet.

[0020] Preferably, the pressure control regulating valve has two valve channels, a regulating valve core is provided at the internal connection of the two valve channels, a spring is provided on the regulating valve core, a regulating valve stem is provided above the spring, the regulating valve stem is also provided with an adjusting handwheel, an upper end cover is provided above the valve channel where the regulating valve stem is located, an upper end cover fixing screw and a sealing pressure cover are provided on the upper end cover; a regulating valve inlet is provided at one end of the pressure control regulating valve body, and a regulating valve outlet is provided at the other end.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The system aims to significantly reduce the humidity of casing gas through advanced gas-liquid separation technology, thereby effectively preventing freezing and blockage that may occur during casing gas recovery in winter. Specifically, the high-humidity casing gas produced by the oil well is introduced into the gas-liquid separator through a vertical inlet pipe. Inside the separator, the casing gas rotates along the inner wall, and the centrifugal force generated by the density difference between the liquid and the gas is used to throw the liquid phase toward the wall and move it downward along the wall, eventually forming a deposit at the bottom of the separator. The bottom of the device is equipped with a discharge valve and a vent valve. Through the connection with the oil well casing, the height difference of the equipment and the action of gravity are used to effectively discharge the waste liquid back into the casing. At the same time, the purified casing gas rises through the central pipe of the separator and enters the return oil pipeline through the separator outlet for recovery and reuse, realizing resource recovery and reuse.

[0023] (2) The device is designed with a ground pipeline fluid backflow prevention structure

[0024] The device utilizes a surface pipeline fluid backflow prevention structure, featuring a pipeline-mounted check valve embedded within the clamp head connected to the side production valve. This design ensures the check valve is completely submerged in the well's produced fluid, thus utilizing the produced fluid's temperature to provide insulation and prevent freezing during winter production. The optimized operation of the check valve prevents reverse flow of the well's produced fluid into the casing, thus ensuring continuous and stable production.

[0025] (3) The device has a pressure regulating structure that can meet the requirements of different oil wells for casing gas recovery pressure

[0026] This device utilizes a carefully designed pressure-control valve. The operator adjusts the tension of the internal spring by rotating a handwheel, thereby precisely controlling the opening pressure of the valve core. When the pressure of the gas flowing through the casing reaches the preset recovery pressure, the valve core automatically opens upward, unblocking the passageway. This process not only ensures unidirectional flow of produced fluids from the well, preventing backflow into the casing, but also ensures continuous and stable recovery of produced fluids, thereby improving the efficiency and safety of the entire oil and gas recovery system.

[0027] In summary, this utility model discloses a multifunctional casing gas recovery device suitable for pumping wells. This device is primarily used for casing gas recovery in remote wells. Through its ingenious design, this device can address complex issues in remote wells, such as low dynamic liquid levels due to casing gas pressure buildup, winter freezing blockage, and backflow prevention, thereby increasing crude oil production. This device design not only ensures the recovery of valuable natural gas resources, avoids atmospheric pollution, and improves the efficiency and safety of the entire oil and gas recovery system, but also achieves the goal of effectively and rationally developing, safely, and environmentally friendly oil and gas resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the multifunctional casing gas recovery device;

[0029] Figure 2 Diagram of the internal structure of the separator;

[0030] Figure 3 Structural diagram of pressure control valve;

[0031] Figure 4 Structural diagram of built-in check valve.

[0032] In the figure, 1. oil return valve, 2. casing liquid injection valve, 3. side production valve, 4. casing air collection valve, 5. built-in antifreeze plugging check valve, 6. casing gas recovery line, 7. pressure control regulating valve, 8. plug with test box, 9. casing pressure gauge, 10. liquid discharge pressure regulating valve, 11. separator inlet, 12. separator inlet control valve, 13. separator vent valve, 14. separator outlet, 15. separator pressure test box, 16. separator pressure gauge, 17. separator; 18. reversing partition;

[0033] 21. Separator pressure gauge, 22. Center tube, 23. Separator body, 24. Casing gas guide channel, 25. Liquid separator plate, 26. Waste liquid outlet, 27. Guide tube; 28. Pressure control regulating valve body, 29. Adjusting handwheel, 30. Regulating valve inlet, 31. Regulating valve core, 32. Regulating valve outlet, 33. Spring, 34. Upper end cover, 35. Regulating valve stem, 36. Upper end cover fixing screw, 37. Sealing cover, 38. Spring base, 39. Valve body, 40. Valve core, 41. Spring, 42. Oil inlet channel. DETAILED DESCRIPTION

[0034] To more clearly illustrate the objectives, technical solutions, and advantages of the present disclosure, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure and should not be construed as limiting the present disclosure. In the specification and drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0035] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present disclosure based on the specific circumstances.

[0037] In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0038] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meaning understood by a person of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish different components. The terms "a" or "an" do not exclude a plurality. Terms such as "include" or "comprise" mean that the element or object preceding the term includes the elements or objects listed after the term and their equivalents, but do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," "right," "top," or "bottom" are used only to indicate relative positional relationships; if the absolute position of the described objects changes, the relative positional relationship may also change accordingly. When an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or intervening elements may be present.

[0039] Example 1

[0040] Multifunctional casing gas recovery device

[0041] The casing gas recovery device is provided with a casing gas recovery pipeline 6, the separator 17 is connected to the casing gas recovery pipeline 6 through a pipeline, the separator outlet 14 is connected to the casing gas recovery device through a pipeline, and an embedded anti-freeze check valve 5 is provided on the separator outlet pipeline. The valve is embedded in the clamp head connected to the side production valve 3.

[0042] Example 2

[0043] The casing gas recovery device is provided with an oil return valve 1 and a casing liquid injection valve 2; the casing gas inlet of the casing gas recovery device is provided with a casing gas receiving valve 4 and a casing gas recovery pipeline 6, the separator 17 is connected to the casing gas recovery pipeline 6 through a pipeline, a separator inlet control valve 12 is provided on the connecting pipeline, the separator outlet 14 is connected to the casing gas recovery device through a pipeline, a pressure control regulating valve 7 and an embedded anti-freeze blocking check valve 5 are provided on the separator outlet 14 pipeline, and the valve is embedded in the clamp head connected to the side production valve 3.

[0044] An inclined reversing baffle 18 is provided inside the separator. A guide pipe 27 is provided below the reversing baffle 18 and connected to the separator inlet 11 . A central pipe 22 is connected to the reversing baffle 18 , and a liquid separation plate 25 is provided below the central pipe 22 .

[0045] A separator outlet 14 is provided on the other side wall of the separator, a separator pressure test box 15 and a separator pressure gauge 16 are provided on the top of the separator, a waste liquid discharge outlet 26 is provided at the bottom of the separator, and a pipeline is set between the waste liquid discharge outlet 26 and the casing gas recovery pipeline 6, on which a discharge pressure regulating valve 10 is provided, and a separator vent valve 13 is provided at the waste liquid discharge outlet.

[0046] One end of the casing gas recovery pipeline 6 is provided with a screw plug 8 with a test box, and a casing pressure gauge 9 is provided on the screw plug 8 with a test box.

[0047] Example 3

[0048] This embodiment is based on the first embodiment, and the pressure control valve is described in more detail as follows:

[0049] The pressure control regulating valve has two valve channels, and a regulating valve core 31 is provided at the internal connection of the two valve channels. A spring 33 is provided on the regulating valve core 31, and a regulating valve stem 35 is provided above the spring 33. The regulating valve stem 35 is also provided with an adjusting handwheel 29. An upper end cover 34 is provided above the valve channel where the regulating valve stem 35 is located, and an upper end cover fixing screw 36 and a sealing pressure cover 37 are provided on the upper end cover 34.

[0050] A regulating valve inlet 30 is provided at one end of the pressure control regulating valve body 28 , and a regulating valve outlet 32 ​​is provided at the other end.

[0051] Example 4

[0052] This embodiment is based on the first embodiment and describes the embedded anti-freeze check valve in more detail as follows:

[0053] The embedded anti-freeze blocking check valve is embedded in the clamp head connected to the side production valve. There is a valve core 40 inside the valve body 39, and an oil inlet channel 42 is provided on the valve core 40. A spring 41 is provided to the right of the valve core 40, and a spring base 38 is provided to the right of the spring 41.

[0054] This device utilizes a pipeline-type check valve embedded within the clamping head connecting the side production valve. This allows the check valve to be completely submerged in the well's produced fluid, utilizing the produced fluid's warmth during winter production to achieve insulation and prevent freezing. A properly functioning check valve prevents the well's produced fluid from flowing back into the casing.

[0055] Example 5

[0056] This embodiment details the working process of the multifunctional casing gas recovery device, which is as follows:

[0057] The casing gas produced by the oil well enters the casing gas recovery device through the casing gas receiving valve 4, and the casing gas enters the separator inlet control valve 12 and the separator inlet 11 in sequence through the recovery pipeline 6. The separator inlet control valve 12 controls the casing gas to pass through the recovery pipeline 6.

[0058] Inside the separator, the casing gas rotates along the casing gas guide channel 24 and the inner wall of the separator 17 under the action of the reversing partition 18 and guide tube 27. Under the influence of centrifugal force, the liquid droplets are thrown toward the wall because the density is greater than that of the gas, causing gas-liquid separation. The droplets move downward along the casing gas guide channel 24 under the influence of centrifugal force and gravity, and eventually settle at the bottom of the separator. After entering the bottom, the gas flows along the center tube 22 into the upper part of the separator and passes through the separator outlet 14. Under the action of the pressure control valve 7, the gas enters the embedded anti-freeze blocking check valve 5 at a constant pressure. After that, the gas passes through the side production valve 3 and the oil return valve 1, and enters the oil return pipeline for recovery.

[0059] The waste liquid at the bottom of the separator is discharged back into the casing by the height difference of the equipment itself and gravity. The waste liquid enters the drain pressure regulating valve 10, the casing gas recovery pipeline 6 and the casing gas receiving valve 4 in sequence through the waste liquid discharge port 26.

[0060] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional casing gas recovery device suitable for oil pumping wells, characterized in that: The casing gas recovery device is provided with a casing gas recovery pipeline (6), the separator (17) is connected to the casing gas recovery pipeline (6) through the pipeline, the separator outlet (14) is connected to the casing gas recovery device through the pipeline, and an embedded anti-freeze blocking check valve (5) is provided on the separator outlet (14) pipeline, and the valve is embedded in the inside of the clamp head connected to the side production valve (3).

2. The device according to claim 1, characterized in that The embedded anti-freeze blocking check valve (5) is embedded in the clamp head connected to the side production valve, the valve body (39) has a valve core (40) inside, the valve core (40) is provided with an oil inlet channel (42), the valve core (40) is provided with a spring (41) on the right, and the spring (41) is provided with a spring base (38) on the right.

3. The device according to claim 1, characterized in that The casing gas recovery device is provided with an oil return valve (1) and a casing liquid injection valve (2); the casing gas inlet of the casing gas recovery device is provided with a casing gas collection valve (4) and a casing gas recovery pipeline (6).

4. The device according to claim 1, characterized in that A separator inlet control valve (12) is provided on the connecting pipeline between the separator (17) and the casing gas recovery pipeline (6).

5. The device according to claim 1, characterized in that A pressure control valve (7) is provided on the separator outlet (14) pipeline.

6. The device according to claim 1, characterized in that One end of the casing gas recovery pipeline (6) is provided with a screw plug (8) with a test box, and a casing pressure gauge (9) is provided on the screw plug (8) with a test box.

7. The device according to claim 1, characterized in that An inclined reversing baffle (18) is provided inside the separator. A guide tube (27) is provided below the reversing baffle (18) and connected to the separator inlet (11). A central tube (22) is connected to the reversing baffle (18). A liquid separation plate (25) is provided below the central tube (22).

8. The device according to claim 1, characterized in that A separator outlet (14) is provided on the separator, a separator pressure test box (15) and a separator pressure gauge (16) are provided on the top of the separator, and a waste liquid discharge outlet (26) is provided on the bottom of the separator.

9. The device according to claim 1, characterized in that The waste liquid discharge outlet (26) is provided with a pipeline and a casing gas recovery pipeline (6), the pipeline is provided with a discharge pressure regulating valve (10), and the waste liquid discharge outlet is provided with a separator vent valve (13).

10. The device according to claim 5, characterized in that The pressure control regulating valve (7) has two valve channels, a regulating valve core (31) is provided at the internal connection of the two valve channels, a spring (33) is provided on the regulating valve core (31), a regulating valve stem (35) is provided above the spring (33), the regulating valve stem (35) is further provided with an adjusting hand wheel (29), an upper end cover (34) is provided above the valve channel where the regulating valve stem (35) is located, and an upper end cover fixing screw (36) and a sealing gland (37) are provided on the upper end cover (34); A regulating valve inlet (30) is provided at one end of the pressure control regulating valve body (28), and a regulating valve outlet (32) is provided at the other end.

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