Pressure testable horn

Abstract

The utility model discloses a kind of under pressure testable horn mouth, including body, body includes integrally-formed small cylindrical end and large cylindrical end, tool withdrawal groove, internal thread, limiting cavity are sequentially set in small cylindrical end, limiting cavity is equipped with limiting stop key, sealing baffle is installed in large cylindrical end, shear pin is equipped between large cylindrical end and sealing baffle, the outer end of large cylindrical end is equipped with horn inner mouth.The utility model realizes the safety of well control requirement of well pipe column under pressure state, under the condition that the original well pipe column is not lifted and other tools and technical measures are not lowered, only by pressing and shearing mode, the conversion of under pressure testable horn mouth function can be completed, construction efficiency and the function extension of tool itself are greatly improved, and the safety hidden danger of well control under pressure operation is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of oil well workover technology under pressure, and in particular to a pressurized testable bell mouth. Background Technology

[0002] In oilfield production, the bell-shaped nozzle is a commonly used tool for assembling downhole tubing. Due to the unique nature of live well workover operations, conventional bell-shaped nozzles require reliable sealing measures to be successfully lowered into the well, meeting the requirements for tubing insertion under pressure. However, ensuring effective sealing of the tubing while simultaneously enabling it to meet other process requirements and simplify the production process through conversion functionality has remained a long-standing challenge.

[0003] A search revealed a Chinese patent, CN112943109B, entitled "Multifunctional Integrated Tubing String for Injection, Testing, and Pressurized Operations." While it includes a bell mouth, this bell mouth serves only as a connection and channel guide at the end of the tubing string. Its functionality relies on other components such as a soluble core shear ball seat and a plugging device working cylinder. Furthermore, it lacks the functional conversion structure of the sealing baffle and shear pin described in this application, and it does not feature a limit stop key to achieve the dual function of blocking the tubing and allowing the testing tool to pass through. The two patents differ fundamentally in their core structure, functional implementation, and application scenarios, and thus cannot solve the technical problem of completing the bell mouth functional conversion without lifting the tubing string under pressurized conditions as described in this application. Utility Model Content

[0004] To solve the above problems, this utility model provides a pressure-testable horn mouth.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a pressure-testable horn mouth, including a body, the body including a small cylindrical end and a large cylindrical end integrally formed and connected, the small cylindrical end having a relief groove, an internal thread and a limiting cavity in sequence, the limiting cavity having a limiting stop key, the large cylindrical end having a sealing baffle installed inside, a shearing pin being provided between the large cylindrical end and the sealing baffle, and the outer end of the large cylindrical end having a horn mouth.

[0006] Furthermore, there are 3-4 limit stop buttons.

[0007] Furthermore, the limit stop key is threadedly connected to the end of the small cylinder.

[0008] Furthermore, a sealing ring is provided between the limit stop key and the small cylindrical end.

[0009] Furthermore, an O-ring is provided between the large cylindrical end and the sealing baffle.

[0010] Furthermore, there are 2-4 shear pins.

[0011] Furthermore, a pin sealing ring is provided between the large cylindrical end and the shear pin.

[0012] Furthermore, the outer circle of the small cylindrical end and the large cylindrical end is provided with an outer chamfer of 130°-160°.

[0013] Furthermore, the inner end of the sealing baffle is provided with an outer chamfer of 15°-45°.

[0014] Furthermore, the angle range of the inner opening of the horn is 5°-15°.

[0015] This invention ensures the safety of the well control requirements of the tubing string under pressure. Without removing the original well tubing string or installing other tools and technical measures, the conversion of the pressure-testable bell mouth function can be completed simply by pressurizing and shearing. This greatly improves construction efficiency and the functional extension of the tool itself, and eliminates the safety hazards of well control during pressurized operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] The components are: 1. Internal thread; 2. Limiting key; 3. O-ring seal; 4. Shear pin; 5. Sealing baffle; 6. Small cylindrical end; 7. Large cylindrical end; 8. Limiting cavity; 9. Trumpet inner opening; 10. Pin seal; 11. Key seal; 12. Relief groove. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 The technical solution of this utility model has been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0020] In the description of this utility model, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used only for distinction and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1 The pressure-testable horn mouth includes a body, which includes a small cylindrical end 6 and a large cylindrical end 7 integrally formed and connected. The small cylindrical end 6 has a relief groove 12, an internal thread 1, and a limiting cavity 8 in sequence. The limiting cavity 8 is provided with a limiting stop key 2. The large cylindrical end 7 is installed with a sealing baffle 5. A shearing pin 4 is provided between the large cylindrical end 7 and the sealing baffle 5. The outer end of the large cylindrical end 7 is provided with a horn mouth 9.

[0023] This invention ensures the smooth insertion of the workover string under pressure, enabling the normal activation of the bell-shaped opening function after unsealing. Furthermore, it prevents testing tools from being unable to be lowered due to the bell-shaped opening structure during subsequent testing. Moreover, after completing the testing procedures, an in-tubing plug can be inserted to effectively re-seal the tubing string within the well.

[0024] Example 2 The pressure-testable horn mouth includes a body, which comprises a small cylindrical end 6 and a large cylindrical end 7 integrally formed and connected. The small cylindrical end 6 has a relief groove 12, an internal thread 1, and a limiting cavity 8 in sequence. The limiting cavity 8 is provided with a limiting stop key 2, of which there are 3-4. The limiting stop key 2 is threadedly connected to the small cylindrical end 6. A stop key sealing ring 11 is provided between the limiting stop key 2 and the small cylindrical end 6. A sealing baffle 5 is installed in the large cylindrical end 7. An O-ring sealing ring 3 is provided between the large cylindrical end 7 and the sealing baffle 5. Shear pins 4 are provided between the large cylindrical end 7 and the sealing baffle 5, of which there are 2-4. A pin sealing ring 10 is provided between the large cylindrical end 7 and the shear pins 4. The outer end of the large cylindrical end 7 is provided with a horn inner opening 9. The outer circle of the small cylindrical end 6 and the large cylindrical end 7 is provided with an outer chamfer of 130°-160°, the inner end of the sealing baffle 5 is provided with an outer chamfer of 15°-45°, and the angle range of the inner opening 9 of the horn is 5°-15°.

[0025] This invention enables pressure sealing within the oil pipe under pressure by using the internal thread 1, the flared inner opening 9, the sealing baffle 5, and the O-ring 3, thus blocking the pressure inside the casing. The flared inner opening 9, with its lower pressure exceeding the internal pipe pressure, further strengthens the sealing baffle 5 for a tighter seal. When the device needs to operate in a flared configuration, pressure is pumped into the oil pipe, creating a pressure difference of approximately 3MPa-6MPa. This cuts off the shear pin 4 and causes the sealing baffle 5 to detach. At this point, relevant testing tools can be lowered according to process requirements for testing. The adjustable limit switch 2 ensures both the interception of oil pipe blockages and the smooth passage of different testing tools.

[0026] The limit stop key 2 has threads that match the limit cavity 8. By turning the limit stop key 2, the internal diameter of the limit cavity 8 is changed. The specific dimensions of the internal diameter of the limit cavity 8 can be preset before the tool is inserted into the well. Ultimately, this achieves the functional requirement that the testing instrument can pass through while the tubing blocker is blocked.

[0027] The sealing baffle 5 temporarily seals the testable bell mouth under pressure to complete the tubing insertion operation under pressure. When testing or other operations are required, the tubing is pressurized to the bearing limit of the shear pin 4, the shear pin 4 is cut off, the sealing baffle 5 falls off, and the next test operation can be carried out.

[0028] When the well casing is subjected to external pressure, the sealing baffle 5 is compacted and sealed. When the internal pressure reaches a predetermined value, the sealing baffle 5 can only move downwards and eventually detach from the main body.

[0029] The O-ring 3 effectively seals the mating area between the body and the sealing baffle 5, and allows it to easily detach from the tubing after being pressurized inside.

[0030] This invention, while ensuring the effective operation and well control safety of the pressurized tubing string and the well plug, opens the sealing baffle 5 through pressure shearing, allowing the testing tool to operate. The limiting stop key 2 ensures that the plug is blocked without obstructing the testing tool, facilitating its passage and retrieval. This not only expands the functionality of the pressurized tubing and improves the quality of live-line operations but also increases the efficiency of live-line work and eliminates safety risks and hazards during the operation.

[0031] The internal thread 1 is used to connect the wellbore tubing, completing the connection with the assembled tubing string at the bottom; the limit stop key 2 intercepts the tubing blocker and acts as a limit device; the O-ring seal 3 is used to seal both ends of the sealing baffle 5; the shear pin 4 fixes and releases the sealing baffle 5, changing the original closed state to an open flared state after pressure is applied and the sealing baffle 5 plays the role of sealing the inner diameter of the flared opening.

[0032] Working process: Before lowering the live test string, connect the live test bell mouth to the bottom of the string through internal thread 1. The string enters the live casing. Because the external pressure of the string is greater than the internal pressure, the tool temporarily seals under pressure due to the pressure difference. The string is lowered to the predetermined depth and ready for operation.

[0033] Test Procedure: By connecting a pressure output pipeline at the wellhead, a pressure of approximately 3-6 MPa higher than the casing pressure is applied to the pressurized bell-shaped inlet and tubing string entering the well. This pressure difference acts on the inner side of the sealing baffle 5, forcing the shear pin 4 to be cut off, and the sealing baffle 5 to detach from the main body. The internal channels of the small cylindrical end 6 and the large cylindrical end 7 open, forming a connection channel with the tubing string inside the well. The testing instrument passes through the pressurized tubing string, the limit stop 2, the small cylindrical end 6, and the large cylindrical end 7 to complete the test.

[0034] Well-pressure testing instrument for pulling in and out: Insert the tubing plug into the wellhead of the pressurized tubing string and push it to the limit stop key 2. After encountering resistance, it sets and seals. The small cylindrical end 6, the large cylindrical end 7, and the tubing plug form a temporary seal, preventing the pressure inside the casing from entering the inner cavity of the tubing string in the well. This ensures well control safety during the tubing string pulling process. At this time, the tubing string can be pulled out in the well while the casing is pressurized.

[0035] This application serves as a clear marker when the tubing string is lowered to the designed depth or when it is retrieved from the well. Without this application, it would be impossible to determine whether all the tubing string has been retrieved or whether any tubing string has fallen into the well when it is being retrieved.

[0036] During normal production of injection and production wells, if this application is not submitted, the high-pressure fluid will cause impact damage to the artificial well bottom and the oil layer casing. The high-pressure fluid injected from the surface enters the annular space of the oil casing in the well through this application, and then enters the formation after the injected high-pressure fluid is depressurized through the structure of this application, which plays a role in protecting the well structure.

[0037] This application is a key tool for ensuring that no oil, gas, or water enters or sprays out of the tubing during pressurized tubing tripping and for testing the construction under pressure. Without sealing and limiting functions, ordinary bell mouths cannot meet the well control safety requirements for normal tubing tripping under pressure.

[0038] Precautions during use: 1. The pressure-testable horn should be stored in a cool, dry place, avoiding moisture, direct sunlight and high temperature environments.

[0039] 2. The horn-shaped opening can be tested under pressure. It should be carefully inspected before entering the well. If any parts are damaged, corroded, or deformed, they must not be lowered into the well.

[0040] 3. Before lowering the testing instrument, ensure that the maximum outer diameter of the testing instrument matches the size of the limit stop key 2 to avoid situations where the testing instrument cannot pass through.

[0041] 4. If, during the process of lowering the tubing into the well, the pressurized test bell mouth seal fails or leaks, a tubing plug can be inserted to seal it. After that, the pressurized test bell mouth can be pulled out. Only after the cause of the seal failure is determined can the tubing be lowered again.

[0042] 5. The pressurized test bell mouth retrieved from the well must be inspected and confirmed by professionals. It can only be reused after all seals and pins have been replaced and the conditions for reuse have been met.

[0043] 6. The flared end can be tested under pressure, but pressure shearing and sealing tests are not recommended on the ground.

[0044] The embodiments described above are merely preferred embodiments of this utility model, and not all feasible embodiments of this utility model. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of this utility model should be considered to be included within the scope of protection of the claims of this utility model. Although this utility model 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 this utility model. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in this utility model 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, this utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure-testable horn-shaped mouth, characterized in that, The body includes a small cylindrical end (6) and a large cylindrical end (7) that are integrally formed and connected. The small cylindrical end (6) has a relief groove (12), an internal thread (1), and a limiting cavity (8) in sequence. The limiting cavity (8) is provided with a limiting stop key (2). The large cylindrical end (7) is equipped with a sealing baffle (5). A shearing pin (4) is provided between the large cylindrical end (7) and the sealing baffle (5). The outer end of the large cylindrical end (7) is provided with a flared inner opening (9).

2. The pressure-testable horn mouth according to claim 1, characterized in that, There are 3-4 limit stop keys (2).

3. The pressure-testable horn mouth according to claim 1, characterized in that, The limiting stop key (2) is threadedly connected to the small cylindrical end (6).

4. The pressure-testable horn mouth according to claim 3, characterized in that, A key sealing ring (11) is provided between the limiting key (2) and the small cylindrical end (6).

5. The pressure-testable horn mouth according to claim 1, characterized in that, An O-ring (3) is provided between the large cylindrical end (7) and the sealing baffle (5).

6. The pressure-testable horn mouth according to claim 1, characterized in that, There are 2-4 shear pins (4).

7. The pressure-testable horn mouth according to claim 1, characterized in that, A pin sealing ring (10) is provided between the large cylindrical end (7) and the shear pin (4).

8. The pressure-testable horn according to claim 1, characterized in that, The outer circle of the small cylindrical end (6) and the large cylindrical end (7) is provided with an outer chamfer of 130°-160°.

9. The pressure-testable horn mouth according to claim 1, characterized in that, The inner end of the sealing baffle (5) is provided with an outer chamfer of 15°-45°.

10. The pressure-testable horn according to claim 1, characterized in that, The angle range of the inner opening (9) of the horn is 5°-15°.

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