Underground check valve device for deep coal bed gas jet pump drainage

Abstract

The underground check valve device comprises a valve seat, the valve seat comprises an annular sleeve body, external threads used for being connected with a pump cylinder are arranged on the periphery of the annular sleeve body, a through hole is formed in the center of the annular sleeve body, the upper section of the through hole is an arc hole, and the lower section of the through hole is an arc hole. The inner side of the upper end of the annular sleeve body is provided with a micro flow guide seam, the micro flow guide seam penetrates through the arc hole to be communicated with an inner space formed by the through hole, a steel ball is contained in the arc hole, a spring is arranged above the steel ball, a connecting base is arranged above the spring and comprises a circular pipe type body, and a plurality of connecting blocks are arranged on the periphery of the circular pipe type body at equal angles. The peripheries of the connecting blocks are arc surfaces and are provided with external threads used for being connected with a pump cylinder, a spigot is formed in the lower end of the circular tube type body, and the upper end of the spring is connected to the spigot in a clamped mode. According to the check valve device, the steel ball is forcibly set on the valve seat under the action of spring force, and the setting effect of the check valve device is not affected even if the check valve device is placed on a deflecting section and a horizontal section with large well deflection.

Description

Technical Field

[0001] This utility model belongs to the technical field of jet pump drainage in deep coalbed methane horizontal wells, specifically relating to a downhole single-flow valve device for jet pump drainage of deep coalbed methane. Background Technology

[0002] The main well type for deep coalbed methane exploration and development is the L-shaped horizontal well. In the later stages of production, jet pumps are used to effectively remove small amounts of coal dust particles from low-yield production, ensuring stable operation of the production well. However, some jet pumps experience water shortages in the tank during operation, leading to equipment malfunction. The primary cause is that the downhole check valve is a hemispherical gravity check valve. When the suction port is lowered to the horizontal section, the check valve cannot return to its original position, resulting in failure to set, water leakage, and equipment malfunction. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a downhole single-flow valve device for deep coalbed methane jet pump drainage.

[0004] This utility model adopts the following technical solution: a downhole single-flow valve device for deep coalbed methane jet pump drainage, including a valve seat, the valve seat including an annular sleeve body, the outer periphery of the annular sleeve body is provided with external threads for connecting the pump barrel, the center of the annular sleeve body is provided with a through hole, the upper section of the through hole is an arc hole, the upper inner side of the annular sleeve body is provided with a micro-guide slit, the micro-guide slit penetrates the arc hole and connects the internal space formed by the through hole, a steel ball is accommodated in the arc hole, a spring is provided above the steel ball, a connecting seat is provided above the spring, the connecting seat includes a cylindrical body, the outer periphery of the cylindrical body is provided with multiple connecting blocks at equal angles, the outer periphery of the multiple connecting blocks is an arc surface and is provided with external threads for connecting the pump barrel, the lower end of the cylindrical body is provided with a stop, the upper end of the spring is engaged with the stop.

[0005] Furthermore, the stop is a convex stop, and the upper end of the spring is sleeved on the convex stop.

[0006] Furthermore, there are three or four connecting blocks.

[0007] Furthermore, two micro-guide slits are symmetrically arranged.

[0008] Compared with the prior art, the downhole single-flow valve device for deep coalbed methane jet pump drainage provided by this utility model has the following beneficial effects:

[0009] 1. The downhole one-way valve device of this utility model, by setting a steel ball and a spring, relies on the spring force to force the steel ball to be seated on the valve seat. Even if the one-way valve device is placed in the well section with a large inclination or the horizontal section, its sealing effect will not be affected.

[0010] 2. By creating a micro-guided flow slot in the valve seat, when the equipment is under maintenance or shut down for an extended period, the mixed liquid containing suspended coal powder particles in the tubing column flows into the wellbore through the micro-guided flow slot. However, the liquid cannot be allowed to pass through in large quantities and quickly. This allows most of the mixed liquid containing coal powder particles to flow back into the wellbore, ensuring stable and long-term operation of the equipment. It also prevents coal powder and other particles from depositing on the check valve and clogging it, which would otherwise lead to pump inspection. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the valve seat of this utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the connector of this utility model.

[0014] In the figure: 1-valve seat, 11-annular sleeve body, 12-through hole, 13-circular arc hole, 14-micro-guide slit, 2-steel ball, 3-spring, 4-connecting seat, 41-circular tube body, 42-connecting block, 43-stop. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] like Figures 1-3 As shown, a downhole single-flow valve device for deep coalbed methane jet pump drainage includes a valve seat 1. The valve seat 1 includes an annular sleeve body 11. The annular sleeve body 11 has an external thread for connecting to the pump barrel on its outer periphery. The annular sleeve body 11 has a through hole 12 at its center. The upper section of the through hole 12 is an arc hole 13. A micro-guide slit 14 is opened on the inner side of the upper end of the annular sleeve body 11. The micro-guide slit 14 passes through the arc hole 13 and connects to the internal space formed by the through hole 12. A steel ball 2 is accommodated in the arc hole 13. A spring 3 is arranged above the steel ball 2. A connecting seat 4 is arranged above the spring 3. The connecting seat 4 includes a cylindrical body 41. Multiple connecting blocks 42 are arranged at equal angles on the outer periphery of the cylindrical body 41. The outer periphery of the multiple connecting blocks 42 is an arc surface and has an external thread for connecting to the pump barrel. A stop 43 is provided at the lower end of the cylindrical body 41. The upper end of the spring 3 is engaged with the stop 43.

[0017] In this embodiment, two micro-guide slits 14 are symmetrically arranged on the annular sleeve body 11. The steel ball 2 sits on the arc hole 13 of the valve seat 1 and contacts the surface of the arc hole 13. Three or four connecting blocks 42 are evenly distributed on the outer periphery of the cylindrical body 41. The stop 43 is a convex stop. The upper end of the spring 3 is sleeved on the convex stop, and the lower end of the spring 3 is connected to the steel ball 2. The entire device is threadedly connected to the valve seat 1 in the pump barrel through the connecting seat 4.

[0018] In the later stages of horizontal well drainage, the pump hanger is usually lowered to a well inclination greater than 75° or to a horizontal section. When the equipment is operating normally, the check valve inside the pump barrel uses spring force to force the steel ball 2 to be seated on the valve seat 1. Even if the check valve is lowered to a well inclination section or a horizontal section with a large inclination, it will not affect its sealing effect. Moreover, the liquid in the well barrel can enter the tubing string through the check valve, and the return fluid is normally returned to the surface.

[0019] When the equipment is under maintenance or shut down for a long period of time, the mixed liquid containing suspended coal powder particles in the liquid column in the tubing flows into the wellbore through the micro-guided slot 14. However, the liquid cannot be allowed to pass through in large quantities and quickly. This way, most of the mixed liquid containing coal powder particles can flow back into the wellbore, so as not to block the one-way valve and cause the need for pump inspection.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A downhole single-flow valve device for deep coalbed methane jet pump drainage, characterized in that: The valve seat (1) includes an annular sleeve body (11). The annular sleeve body (11) has an external thread for connecting to the pump cylinder on its outer periphery. The annular sleeve body (11) has a through hole (12) at its center. The upper section of the through hole (12) is an arc hole (13). A micro-guide slit (14) is opened on the inner side of the upper end of the annular sleeve body (11). The micro-guide slit (14) passes through the arc hole (13) and connects to the internal space formed by the through hole (12). The arc hole (13) contains... A steel ball (2) is accommodated. A spring (3) is provided above the steel ball (2). A connecting seat (4) is provided above the spring (3). The connecting seat (4) includes a cylindrical body (41). Multiple connecting blocks (42) are provided at equal angles on the outer periphery of the cylindrical body (41). The outer periphery of the multiple connecting blocks (42) is an arc surface and is provided with external threads for connecting the pump cylinder. A stop (43) is provided at the lower end of the cylindrical body (41). The upper end of the spring (3) is engaged with the stop (43).

2. The downhole single-flow valve device for deep coalbed methane jet pump drainage according to claim 1, characterized in that: The stop (43) is a convex stop, and the upper end of the spring (3) is sleeved on the convex stop.

3. The downhole single-flow valve device for deep coalbed methane jet pump drainage according to claim 1, characterized in that: The connecting block (42) is set to three or four.

4. The downhole single-flow valve device for deep coalbed methane jet pump drainage according to any one of claims 1 to 3, characterized in that: There are two symmetrically arranged micro-guided slits (14).

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