Fixed gas lift valve with high air tightness

Abstract

The utility model discloses a fixed gas lift valve with high air tightness, which belongs to the technical field of oil extraction and comprises a gas lift valve main body and a check valve main body, the check valve main body is mounted at the end of the gas lift valve main body, and external threads are arranged on the outer side of the lower end of the check valve main body. A sealing rubber ring is installed at the end, located in the outer working barrel fixing base, of the check valve body in an attached mode, the section of the sealing rubber ring is conical, an air storage cavity is formed in the sealing rubber ring, and an air inlet hole channel is formed in the side wall of the check valve body. Air flow in an annular space of an oil pipe is introduced into the air storage cavity of the sealing rubber ring, so that the sealing rubber ring is expanded, the sealing rubber ring can be tightly attached to a fixing seat of an external working barrel and a connecting ring, the air tightness of the device is improved, the sealing performance of connection between the device and the fixing seat of the working barrel is guaranteed, and the service life of the device is prolonged. And the situation that oil enters the oil pipe annulus is avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, specifically a fixed air lift valve with high airtightness. Background Technology

[0002] In the process of oil and gas well development, gas lift is a commonly used method for oil production and fluid drainage. The gas lift valve is installed on the working cylinder and lowered to a specified depth along with the tubing. The opening and closing of the gas lift valve is controlled by annular pressurization on the surface. The annular pressure acts on the bellows of the gas lift valve, causing the gas lift valve to open. The annular gas enters the gas lift valve and then enters the tubing through the check valve on the gas lift valve to achieve artificial lifting.

[0003] However, the existing gas lift valve is connected to the working cylinder by NPT thread, which requires wrapping PTFE tape around the thread to achieve a seal. However, PTFE tape is not very reliable in corrosive and high-temperature and high-pressure well conditions, and can easily cause oil to enter the tubing annulus. Utility Model Content

[0004] The purpose of this utility model is to provide a fixed air lift valve with high airtightness to solve the problem mentioned in the background art that the existing air lift valve and the working cylinder are connected by NPT threads, which require wrapping PTFE tape on the threads to achieve a seal. However, PTFE tape is not very reliable under corrosive and high-temperature and high-pressure well conditions, which can easily lead to oil entering the annulus of the tubing.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixed air lift valve with high airtightness, comprising an air lift valve body and a single-flow valve body, wherein a single-flow valve body is installed at the end of the air lift valve body, and an external thread is provided on the lower outer side of the single-flow valve body, and the single-flow valve body is installed in the fixed seat of the outer working cylinder by rotating the thread;

[0006] A sealing ring is fitted to one end of the one-way valve body located inside the external working cylinder fixing seat. The sealing ring has a conical cross-section and an air storage chamber inside. An air inlet channel is opened on the side wall of the one-way valve body. One end of the air inlet channel is connected to the external oil pipe annulus, and the other end of the air inlet channel is connected to the air storage chamber.

[0007] As a preferred embodiment of this utility model, it further includes a connecting ring, which is installed in the fixed seat of the outer working cylinder. The connecting ring can be inserted into the sealing ring, and a sealing gasket is installed on the outer side wall of the connecting ring. The sealing gasket can fit against the side wall of the sealing ring.

[0008] As a preferred embodiment of this utility model, the end of the air lift valve body away from the single-flow valve body is provided with an insertion hole, and the external working cylinder set screw can be inserted and installed in the insertion hole. The side wall of the air lift valve body is provided with a positioning hole, which is connected to the insertion hole. A locking bolt is inserted and installed in the positioning hole, and the locking bolt can fit against the side wall of the external working cylinder set screw.

[0009] As a preferred embodiment of this utility model, a rubber pad is installed at one end of the locking bolt located inside the insertion hole, and the rubber pad can fit against the side wall of the external working cylinder top screw.

[0010] As a preferred embodiment of this utility model, a positioning ring is fitted onto the side wall of the sealing ring, and a screw is inserted into the side wall of the positioning ring. A connecting hole is provided on the side wall of the one-way valve body, and an internal thread is provided in the connecting hole. The screw is screwed into the connecting hole.

[0011] As a preferred embodiment of this invention, an elastic component is inserted and installed inside the gas storage cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This device improves airtightness by installing a sealing ring below its single-flow valve body. By introducing airflow from the oil pipe annulus into the air storage chamber of the sealing ring, the sealing ring expands, allowing it to fit tightly against the fixing seat and connecting ring of the external working cylinder. This ensures the sealing of the connection between the device and the working cylinder fixing seat, preventing oil from entering the oil pipe annulus. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this patent;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the sealing ring in this patent.

[0016] In the diagram: 1 Air lift valve body, 2 One-way valve body, 3 Sealing ring, 4 Air storage chamber, 5 Air inlet channel, 6 Connecting ring, 7 Sealing gasket, 8 Insertion hole, 9 Positioning hole, 10 Locking bolt, 11 Rubber gasket, 12 Positioning ring, 13 Screw, 14 Connecting hole, 15 Elastic component. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-2 This utility model provides a technical solution:

[0019] In this technical solution, a fixed air lift valve with high airtightness includes an air lift valve body 1 and a single-flow valve body 2. The single-flow valve body 2 is installed at the end of the air lift valve body 1. The lower outer side of the single-flow valve body 2 is provided with an external thread. The single-flow valve body 2 is installed in the fixed seat of the outer working cylinder by rotating the thread.

[0020] One end of the one-way valve body 2 located inside the external working cylinder fixing seat is fitted with a sealing ring 3. The sealing ring 3 has a conical cross section and an air storage chamber 4 inside. An air inlet channel 5 is opened on the side wall of the one-way valve body 2. One end of the air inlet channel 5 is connected to the external oil pipe annulus, and the other end of the air inlet channel 5 is connected to the air storage chamber 4.

[0021] In this technical solution, after the device is installed into the fixed seat on the outer working cylinder through the thread on the outside of the single-flow valve body 2, the sealing ring 3 is tightly fitted with the connecting ring 6 on the inner wall of the fixed seat, thereby ensuring the airtightness of the device after installation and preventing oil from entering the annulus of the oil pipe.

[0022] Meanwhile, the device also has an air inlet channel 5 on the side wall of the single-flow valve body 2. When pressurizing the oil pipe annulus, the airflow will enter the air storage chamber 4 of the sealing ring 3 through the air inlet channel 5, causing the sealing ring 3 to inflate and expand, so that it can fit tightly with the fixing seat of the external working cylinder and the connecting ring 6.

[0023] In some technical solutions, a connecting ring 6 is also included. The connecting ring 6 is installed in the fixed seat of the outer working cylinder. The connecting ring 6 can be inserted into the sealing ring 3. A sealing gasket 7 is installed on the outer side wall of the connecting ring 6. The sealing gasket 7 can fit against the side wall of the sealing ring 3.

[0024] In some technical solutions, the end of the air lift valve body 1 away from the single-flow valve body 2 is provided with an insertion hole 8, and the external working cylinder set screw can be inserted and installed in the insertion hole 8. The side wall of the air lift valve body 1 is provided with a positioning hole 9, which is connected to the insertion hole 8. A locking bolt 10 is inserted and installed in the positioning hole 9, and the locking bolt 10 can fit against the side wall of the external working cylinder set screw.

[0025] In this technical solution, the function of the set screw is to hold the device in place and prevent it from shaking after being installed on the working cylinder. After the set screw is inserted into the insertion hole 8, the set screw can be further fixed by rotating the locking bolt 10 to prevent the set screw from rotating and causing the connection between the device and the working cylinder to loosen.

[0026] In some technical solutions, a rubber pad 11 is installed at one end of the locking bolt 10 located inside the insertion hole 8, and the rubber pad 11 can fit against the side wall of the external working cylinder set screw.

[0027] In this technical solution, the rubber pad 11 can increase the friction between the locking bolt 10 and the set screw, making their fit tighter.

[0028] In some technical solutions, a positioning ring 12 is fitted onto the side wall of the sealing ring 3, and a screw 13 is inserted into the side wall of the positioning ring 12. A connecting hole 14 is opened on the side wall of the one-way valve body 2, and an internal thread is provided in the connecting hole 14. The screw 13 is screwed into the connecting hole 14.

[0029] In this technical solution, the positioning ring 12 and screw 13 are used to prevent the sealing ring 3 from detaching from the side wall of the one-way valve body 2.

[0030] In some technical solutions, an elastic component 15 is inserted and installed inside the gas storage chamber 4.

[0031] In this technical solution, the elastic component 15 is a rubber ring with a circular cross-section, which helps to support the sealing ring 3 outward.

[0032] Working principle: After the device is installed into the fixed seat on the outer working cylinder through the thread on the outside of the single-flow valve body 2, the sealing ring 3 is tightly fitted with the connecting ring 6 on the inner wall of the fixed seat, thereby ensuring the airtightness of the device after installation and preventing oil from entering the annulus of the oil pipe.

[0033] Meanwhile, the device also has an air inlet channel 5 on the side wall of the single-flow valve body 2. When pressurizing the oil pipe annulus, the airflow will enter the air storage chamber 4 of the sealing ring 3 through the air inlet channel 5, causing the sealing ring 3 to inflate and expand, so that it can fit tightly with the fixing seat of the external working cylinder and the connecting ring 6.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, 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 fixed air lift valve with high airtightness, comprising an air lift valve body (1) and a single-flow valve body (2), characterized in that: A single-flow valve body (2) is installed at the end of the air lift valve body (1). The lower outer side of the single-flow valve body (2) is provided with an external thread. The single-flow valve body (2) is installed in the fixed seat of the outer working cylinder by rotating the thread. The one-way valve body (2) is fitted with a sealing ring (3) at one end inside the external working cylinder fixing seat. The sealing ring (3) has a conical cross section and an air storage chamber (4) inside. The side wall of the one-way valve body (2) is provided with an air inlet channel (5). One end of the air inlet channel (5) is connected to the external oil pipe annulus, and the other end of the air inlet channel (5) is connected to the air storage chamber (4).

2. The fixed air-lift valve with high airtightness according to claim 1, characterized in that: It also includes a connecting ring (6), which is installed in the fixed seat of the outer working cylinder. The connecting ring (6) can be inserted into the sealing ring (3). A sealing gasket (7) is installed on the outer side wall of the connecting ring (6), and the sealing gasket (7) can fit against the side wall of the sealing ring (3).

3. A fixed air-lift valve with high airtightness according to claim 1, characterized in that: The air lift valve body (1) has an insertion hole (8) at one end away from the single-flow valve body (2). An external working cylinder set screw can be inserted into the insertion hole (8). The side wall of the air lift valve body (1) has a positioning hole (9). The positioning hole (9) is connected to the insertion hole (8). A locking bolt (10) is inserted into the positioning hole (9). The locking bolt (10) can fit against the side wall of the external working cylinder set screw.

4. A fixed air-lift valve with high airtightness according to claim 3, characterized in that: The locking bolt (10) has a rubber pad (11) installed at one end inside the insertion hole (8), and the rubber pad (11) can fit against the side wall of the external working cylinder top screw.

5. A fixed air-lift valve with high airtightness according to claim 1, characterized in that: The sealing ring (3) is fitted with a positioning ring (12) on its side wall. A screw (13) is inserted into the side wall of the positioning ring (12). The side wall of the single-flow valve body (2) is provided with a connecting hole (14). The connecting hole (14) is provided with an internal thread. The screw (13) is screwed into the connecting hole (14).

6. A fixed air-lift valve with high airtightness according to claim 1, characterized in that: An elastic component (15) is inserted and installed inside the gas storage chamber (4).

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