Drill rod arrow-shaped check valve with protective structure for oil exploitation

Abstract

The utility model relates to the field of oil exploitation equipment, in particular to a drill rod arrow-shaped check valve with a protective structure for oil exploitation, which comprises a valve body, an arrow-shaped valve rod and a protective cover, the valve body comprises an upper valve and a lower valve, the bottom of the lower valve is provided with a liquid guide port I, the top of the lower valve is provided with a valve cover, the valve cover is provided with a sleeve, and a spring is mounted in the sleeve. The arrow-shaped valve rod is installed in the sleeve through the spring, the outer wall of the arrow-shaped valve rod is attached to the inner wall of the sleeve, the valve body is sleeved with the protective cover through a thread structure, the two ends of the protective cover are each of a conical structure, underground corrosive substances can be effectively isolated, internal components are protected against corrosion, and the hollow layer is arranged in the protective cover and spaced by the reinforcing ribs. The structure strength and corrosion resistance are improved while the weight is reduced, the hole groove is formed in the bottom of the arrow-shaped valve rod, the spring is inserted into the hole groove, the stability and reliability of the spring are ensured, and the arrow-shaped valve rod can be kept in a closed state when no fluid pressure exists.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment, specifically to an oil extraction drill pipe arrow-shaped check valve with a protective structure. Background Technology

[0002] In oil drilling operations, the drill pipe arrow check valve is an important blowout preventer. Installed at the bottom of the drill pipe, it quickly closes when the drill pipe is lifted from the wellbore to prevent fluids (such as mud, oil, and gas) from flowing back to the surface. This check valve is crucial for ensuring the safety and efficiency of drilling operations. However, traditional drill pipe arrow check valves have some shortcomings in practical applications:

[0003] Poor sealing performance:

[0004] Wear and tear: The seals in traditional check valves are prone to wear and tear due to long-term use and high-pressure environments, resulting in a decrease in sealing performance.

[0005] Leakage risk: Poor sealing can cause fluid backflow in the well, increasing operational risks.

[0006] Poor corrosion resistance:

[0007] Harsh environment: The underground environment usually contains high concentrations of corrosive substances, such as hydrogen sulfide and chloride ions, which will accelerate the corrosion of check valve materials.

[0008] Short service life: Due to corrosion, traditional check valves have a short service life and require frequent replacement, increasing maintenance costs.

[0009] Low reliability:

[0010] High pressure and high temperature environment: Under high pressure and high temperature conditions, traditional check valves may malfunction, affecting the safety of drilling operations.

[0011] Spring failure: The spring in a traditional check valve may fail due to fatigue or corrosion, causing the check valve to malfunction.

[0012] Maintenance difficulties:

[0013] Complex internal structure: The internal structure of traditional check valves is relatively complex, making maintenance and replacement of parts difficult.

[0014] Inconvenient disassembly: Traditional check valves have inflexible connection methods, and the disassembly and installation process is cumbersome.

[0015] Limited applicability:

[0016] Single design: Traditional check valves are often designed for specific downhole conditions and are difficult to adapt to a variety of complex downhole environments. Utility Model Content

[0017] (a) Technical problems to be solved

[0018] To address the shortcomings of existing technologies, this utility model provides an oil drilling pipe arrow-shaped check valve with a protective structure.

[0019] (II) Technical Solution

[0020] To achieve the above objectives, this utility model provides the following technical solution: A protective structure for an oil drilling pipe arrow-shaped check valve includes a valve body, an arrow-shaped valve stem, and a protective cover. The valve body includes an upper valve and a lower valve. The bottom of the lower valve has a first fluid guide port, and the top of the lower valve has a valve cover. The valve cover has a sleeve, and a spring is installed inside the sleeve. The arrow-shaped valve stem is installed inside the sleeve via the spring, and the outer wall of the arrow-shaped valve stem fits against the inner wall of the sleeve. The valve cover has several through holes arranged around it. The top of the upper valve has a second fluid guide port, and the interior of the upper valve has a fluid guide cavity. The bottom of the fluid guide cavity is adapted to the arrow-shaped valve stem. The upper valve is threaded onto the lower valve, and the protective cover is threaded onto the outside of the valve body. The two ends of the protective cover are tapered.

[0021] Preferably, the protective cover is provided with several layers of reinforcing ribs.

[0022] More preferably, the protective cover has a hollow layer inside, and the hollow layer is spaced by reinforcing ribs.

[0023] Preferably, the top of the upper valve is provided with a connector, the connector having a tapered structure and being threaded.

[0024] Preferably, the top of the arrow-shaped valve stem is covered with a sealing sleeve.

[0025] More preferably, the through hole adopts an arc-shaped structure.

[0026] Preferably, the bottom of the arrow-shaped valve stem is provided with a groove, and the spring is inserted into the groove.

[0027] (III) Beneficial Effects

[0028] Compared with the prior art, this utility model provides an oil drilling pipe arrow-shaped check valve with a protective structure, which has the following beneficial effects:

[0029] Enhanced corrosion resistance:

[0030] Protective cover: The protective cover is fitted onto the outside of the valve body through a threaded structure, with tapered ends, which can effectively isolate downhole corrosive substances and protect internal components from corrosion.

[0031] Reinforcing ribs: The protective cover is equipped with several layers of reinforcing ribs, which enhances the mechanical strength and corrosion resistance of the cover and extends its service life.

[0032] Hollow layer design: The protective cover has a hollow layer with reinforcing ribs, which reduces weight while improving structural strength and corrosion resistance.

[0033] Improve reliability:

[0034] Spring stability: The bottom of the arrow-shaped valve stem has a groove into which the spring is inserted to ensure the stability and reliability of the spring, so that the arrow-shaped valve stem can remain closed when there is no fluid pressure.

[0035] Through-hole design: Several through holes are arranged around the valve cover. These through holes adopt an arc-shaped structure, which helps to evenly distribute fluid pressure, reduce local stress concentration, and improve the stability of the overall structure.

[0036] Easy to maintain and replace:

[0037] Threaded connection: The upper valve is fitted onto the lower valve via a threaded structure, and the protective cover is also fitted onto the outside of the valve body via a threaded structure. This design facilitates disassembly and replacement of parts and simplifies the maintenance process.

[0038] Standard connector: The top of the upper valve is equipped with a connector. The connector has a tapered structure and is threaded, which facilitates connection with other drill rods or pipes and improves interchangeability and versatility.

[0039] Wide range of applications:

[0040] Multiple downhole environments: This check valve is suitable for various complex downhole environments, including deep wells, high-temperature wells, and highly corrosive wells, and has broad application prospects.

[0041] Optimize fluid flow:

[0042] Liquid guiding chamber design: The upper valve has a liquid guiding chamber inside, and the bottom of the liquid guiding chamber is adapted to the arrow-shaped valve stem to ensure that the fluid can pass smoothly through the check valve, reduce flow resistance, and improve working efficiency.

[0043] Liquid guide port design: The bottom of the lower valve is provided with liquid guide port one, and the top of the upper valve is provided with liquid guide port two. The design of these liquid guide ports helps the fluid to enter and exit smoothly and improves the fluid transmission efficiency.

[0044] Compact structure:

[0045] Integrated design: The entire check valve has a compact structure and the components fit together closely, reducing space occupation and facilitating installation and operation.

[0046] Improve security:

[0047] Double sealing: The tight fit between the arrow-shaped valve stem and the sleeve, along with the double sealing design of the sealing sleeve, ensures good sealing performance even under high pressure, thus improving operational safety.

[0048] Economic efficiency:

[0049] Long service life: By optimizing material selection and structural design, the service life of the check valve is extended, reducing the cost of frequent replacement and maintenance, and improving economic efficiency. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the protective cover structure of this utility model;

[0051] Figure 2 This is a schematic diagram of the lower valve structure of this utility model;

[0052] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve body of this utility model;

[0053] Figure 4 This is a schematic diagram of the cross-sectional structure of the protective cover of this utility model;

[0054] In the diagram: 1. Upper valve; 2. Lower valve; 3. Valve cover; 4. Through hole; 5. Arrow-shaped valve stem; 6. Sleeve; 7. Spring; 8. Groove; 9. Liquid guiding chamber; 10. Connector; 11. Protective cover; 12. Hollow layer; 13. Reinforcing rib. Detailed Implementation

[0055] 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.

[0056] Please see Figure 1-4This utility model discloses an oil drilling pipe arrow-shaped check valve with a protective structure, comprising a valve body, an arrow-shaped valve stem 5, and a protective cover 11. The valve body includes an upper valve 1 and a lower valve 2. The bottom of the lower valve 2 is provided with a liquid guide port, and the top of the lower valve 2 is provided with a valve cover 3. The valve cover 3 is provided with a sleeve 6, and a spring 7 is installed inside the sleeve 6. The arrow-shaped valve stem 5 is installed inside the sleeve 6 by the spring 7, and the outer wall of the arrow-shaped valve stem 5 is in contact with the inner wall of the sleeve 6. The valve cover 3 is provided with several through holes 4. The top of the upper valve 1 is provided with a second liquid guide port, and the interior of the upper valve 1 is provided with a liquid guide cavity 9. The bottom of the liquid guide cavity 9 is adapted to the arrow-shaped valve stem 5. The upper valve 1 is threaded onto the lower valve 2, and the protective cover 11 is threaded onto the outside of the valve body. The two ends of the protective cover 11 are tapered structures.

[0057] The working principle of the drill pipe arrow-shaped check valve with protective structure and the working principle of various optimized technical solutions.

[0058] Basic working principle

[0059] Normal operating condition: When drilling fluid flows downward from the second guide port of the upper valve 1, the fluid pressure pushes the arrow-shaped valve stem 5 downward, opening the first guide port of the lower valve 2, allowing fluid to pass through.

[0060] Closed state: When the drill pipe is lifted from the wellbore, the fluid pressure disappears, and the elastic force of the spring 7 causes the arrow-shaped valve stem 5 to move upward, closing the fluid inlet 1 and preventing fluid backflow in the well.

[0061] Working principles of various preferred technical solutions

[0062] Valve body and its components

[0063] Upper valve 1 and lower valve 2:

[0064] Upper valve 1: It has a liquid guide port 2 at the top and a liquid guide cavity 9 inside. The bottom of the liquid guide cavity 9 is adapted to the arrow-shaped valve stem 5. Upper valve 1 is fitted onto lower valve 2 by a threaded structure.

[0065] Lower valve 2: It has a liquid guide port at the bottom and a valve cover 3 at the top. The valve cover 3 is equipped with a sleeve 6, and a spring 7 is installed inside the sleeve 6. The arrow-shaped valve stem 5 is installed inside the sleeve 6 through the spring 7.

[0066] Valve cover 3 and sleeve 6:

[0067] Valve cover 3: It is surrounded by several through holes 4. These through holes 4 have an arc-shaped structure, which helps to evenly distribute fluid pressure.

[0068] Sleeve 6: A spring 7 is installed inside. The arrow-shaped valve stem 5 is installed inside the sleeve 6 through the spring 7, and the outer wall of the arrow-shaped valve stem 5 fits against the inner wall of the sleeve 6 to ensure good sealing performance.

[0069] Liquid guiding chamber 9: Located inside the upper valve 1, the bottom of the liquid guiding chamber 9 is adapted to the arrow-shaped valve stem 5 to ensure that the arrow-shaped valve stem 5 can move smoothly and maintain a seal.

[0070] Arrow-shaped valve stem 5 and its components

[0071] Arrow-shaped valve stem 5: Installed inside the sleeve 6 by spring 7, the outer wall of the arrow-shaped valve stem 5 fits against the inner wall of the sleeve 6 to ensure good sealing performance.

[0072] Sealing sleeve: The top of the arrow-shaped valve stem 5 is wrapped with a sealing sleeve to further improve the sealing performance.

[0073] Groove 8: The bottom of the arrow-shaped valve stem 5 is provided with a groove 8, and the spring 7 is inserted into the groove 8 to ensure the stability and reliability of the spring 7.

[0074] Shield 11 and its components

[0075] Protective cover 11: It is fitted onto the outside of the valve body via a threaded structure, with tapered ends to provide additional protection.

[0076] Reinforcing ribs 13: Several layers of reinforcing ribs 13 are provided on the protective cover 11 to enhance the mechanical strength and corrosion resistance of the protective cover 11.

[0077] Hollow layer 12: A hollow layer 12 is provided inside the protective cover 11, which is separated by reinforcing ribs 13, reducing weight while improving structural strength.

[0078] Connector 10

[0079] Connector 10: The top of the upper valve 1 is provided with connector 10. Connector 10 adopts a tapered structure and is threaded, which facilitates connection with other drill rods or pipes.

[0080] Summarize

[0081] This utility model provides an oil well drilling pipe arrow-shaped check valve with a protective structure. Through optimized design and the addition of a protective structure, the check valve's sealing performance, corrosion resistance, and reliability are significantly improved. The main beneficial effects of this device are as follows:

[0082] High-efficiency sealing:

[0083] Sealing sleeve: The top of the arrow-shaped valve stem 5 is wrapped with a sealing sleeve to further improve the sealing performance.

[0084] Tight fit: The outer wall of the arrow-shaped valve stem 5 fits snugly against the inner wall of the sleeve 6, ensuring good sealing performance.

[0085] Enhanced corrosion resistance:

[0086] Protective cover 11: Protective cover 11 is fitted onto the outside of the valve body via a threaded structure, with tapered ends to provide additional protection.

[0087] Reinforcing ribs 13: Several layers of reinforcing ribs 13 are provided on the protective cover 11 to enhance the mechanical strength and corrosion resistance of the protective cover 11.

[0088] Hollow layer 12: A hollow layer 12 is provided inside the protective cover 11, which is separated by reinforcing ribs 13, reducing weight while improving structural strength.

[0089] Improve reliability:

[0090] Spring 7: Spring 7 is installed inside sleeve 6 to ensure that the arrow valve stem 5 remains closed when there is no fluid pressure.

[0091] Groove 8: The bottom of the arrow-shaped valve stem 5 is provided with a groove 8, and the spring 7 is inserted into the groove 8 to ensure the stability and reliability of the spring 7.

[0092] Easy to maintain:

[0093] Threaded structure: The upper valve 1 is fitted onto the lower valve 2 via a threaded structure, and the protective cover 11 is fitted onto the outside of the valve body via a threaded structure, which facilitates disassembly and replacement of parts.

[0094] Connector 10: The top of the upper valve 1 is provided with connector 10. Connector 10 adopts a tapered structure and is threaded, which facilitates connection with other drill rods or pipes.

[0095] Wide range of applications:

[0096] Suitable for various complex downhole environments, including deep wells, high-temperature wells, and highly corrosive wells.

[0097] Through the above technical solution, the drill pipe arrow-shaped check valve not only improves sealing performance, corrosion resistance and reliability, but also simplifies the maintenance process, and has broad application prospects.

[0098] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil well drilling pipe arrow-shaped check valve with a protective structure, characterized in that, The device includes a valve body, an arrow-shaped valve stem (5), and a protective cover (11). The valve body includes an upper valve (1) and a lower valve (2). The bottom of the lower valve (2) is provided with a liquid guide port, and the top of the lower valve (2) is provided with a valve cover (3). A sleeve (6) is provided on the valve cover (3), and a spring (7) is installed inside the sleeve (6). The arrow-shaped valve stem (5) is installed inside the sleeve (6) by the spring (7), and the outer wall of the arrow-shaped valve stem (5) is flush with the sleeve. (6) The inner wall is fitted, and the valve cover (3) is surrounded by several through holes (4). The top of the upper valve (1) is provided with a liquid guide port. The interior of the upper valve (1) is provided with a liquid guide cavity (9). The bottom of the liquid guide cavity (9) is adapted to the arrow-shaped valve stem (5). The upper valve (1) is fitted onto the lower valve (2) through a threaded structure. The protective cover (11) is fitted onto the outside of the valve body through a threaded structure. The two ends of the protective cover (11) are conical structures.

2. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 1, characterized in that, The protective cover (11) is provided with several layers of reinforcing ribs (13).

3. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 2, characterized in that, The protective cover (11) has a hollow layer (12) inside, and the hollow layer (12) is spaced by reinforcing ribs (13).

4. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 3, characterized in that, The top of the upper valve (1) is provided with a connector (10), the connector (10) adopts a conical structure, and the connector (10) is provided with threads.

5. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 4, characterized in that, The top of the arrow-shaped valve stem (5) is covered with a sealing sleeve.

6. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 5, characterized in that, The through hole (4) has an arc-shaped structure.

7. The oil drilling pipe arrow-shaped check valve with a protective structure according to claim 6, characterized in that, The bottom of the arrow-shaped valve stem (5) is provided with a groove (8), and the spring (7) is inserted into the groove (8).

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