Threaded protective sleeve

Abstract

The utility model discloses a thread protective sleeve which is used for protecting an end thread section of an oil pipe and comprises a protective sleeve body and an air tap, the protective sleeve body is annular, a matching groove matched with the end thread section of the oil pipe is formed in the annular inner wall of the protective sleeve body, and an inflation cavity is formed in the protective sleeve body; the air tap is installed on the side wall of the protective sleeve body and communicated with the inflation cavity, and the air tap is suitable for being connected with an air source so as to inflate air into the inflation cavity; the protective sleeve body is suitable for being inflated after being sleeved with the end threaded section of the oil pipe so that the matching groove can be attached to the outer wall face of the end threaded section of the oil pipe to protect the threaded section. According to the utility model, reliable sealing can be provided in a complex environment, and the threads are effectively protected from being damaged, polluted and rusted.

Description

Technical Field

[0001] This utility model relates to a threaded protective sleeve, belonging to the field of oil pipe design technology. Background Technology

[0002] Currently, thread protection sleeves are mainly used to protect the threaded ends of pipes such as steel pipes, oil pipes, and casings, preventing damage to the threads during construction.

[0003] A search of existing technologies revealed a Chinese patent (publication number CN207144890U) disclosing a wellhead thread protection device. This device includes an outer protective sleeve and an inner protective sleeve. The outer protective sleeve is connected to the wellhead thread via an internal thread and uses a limit adjustment device to accommodate and support polished rods of different specifications. It also includes an elastic bladder for lubricating the wellhead threads. This device is mainly used for protecting the wellhead threads and guiding and supporting the polished rod during wellhead operations. However, its use has been found to be cumbersome. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a threaded protective sleeve that can protect the end threaded section of the oil pipe even in complex environments, and effectively protect the thread from damage, contamination and corrosion.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a threaded protective sleeve for protecting the threaded end section of an oil pipe, comprising:

[0006] The protective sleeve body is annular, and the annular protective sleeve body forms a mating groove that is adapted to the end threaded section of the oil pipe. The protective sleeve body is provided with an air-filled cavity inside.

[0007] An air nozzle is installed on the side wall of the protective sleeve body and communicates with the inflation cavity. The air nozzle is adapted to be connected to an air source to inflate the inflation cavity with gas.

[0008] The protective sleeve body is adapted to be inflated after being fitted into the end threaded section of the oil pipe so that the mating groove fits against the outer wall surface of the end threaded section of the oil pipe to protect the threaded section.

[0009] Furthermore, the inner wall of the mating groove is provided with threads.

[0010] Furthermore, the protective sleeve body is provided with an abutment ring extending towards the center at the end of the mating groove, the abutment ring being adapted to abut against the end face of the inserted oil pipe.

[0011] Furthermore, the outer diameter of the middle part of the outer wall surface of the protective sleeve body is larger than the outer diameters at both ends.

[0012] Furthermore, the end face of the protective sleeve body has a groove, and the air nozzle is disposed in the groove.

[0013] Furthermore, the groove is provided with internal threads;

[0014] The threaded protective sleeve also includes a dust cover, which has an external thread corresponding to the internal thread of the groove.

[0015] Furthermore, the dust cover is attached to the protective sleeve body via a connecting rope.

[0016] Furthermore, the threaded protective sleeve also includes a parameter marking area, which is disposed on the outer surface of the protective sleeve body and is adapted to indicate the specification information of the applicable oil pipe thread.

[0017] Furthermore, the protective sleeve body is made of elastic rubber material.

[0018] Furthermore, the mating groove has a taper that matches the taper of the end thread section of the oil pipe.

[0019] By adopting the above technical solution, this utility model has the following beneficial effects:

[0020] In this invention, during use, the threaded end of the oil pipe is inserted into the mating groove. Then, gas is injected into the inflation chamber through the air nozzle, causing the protective sleeve to expand. The expanded protective sleeve tightly adheres to the threaded surface of the threaded end of the oil pipe, forming a fully enclosed protective layer. This tight contact formed by inflation not only effectively isolates external dust, moisture, and corrosive media, providing reliable sealing protection for the threads and preventing rust or contamination, but also, the elastic protective sleeve after inflation absorbs and buffers external vibrations, reducing the impact of vibration or impact on the oil pipe threads.

[0021] In addition, the inner wall of the mating groove is threaded, which can fit well with the threaded section of the oil pipe end after the protective sleeve body expands. The protective sleeve body has an abutment ring at the end of the mating groove. This abutment ring can abut against the end face of the inserted oil pipe, which plays a limiting role, preventing the oil pipe from being inserted too deeply or too shallow, and protecting the end face of the oil pipe. The protective sleeve body also has a parameter marking area, which is set on the outer surface of the protective sleeve body, so that users can quickly identify the specifications and models of the threaded protective sleeve, ensure that the product that matches the oil pipe thread is selected, and avoid misuse.

[0022] In summary, this utility model, by setting an inflatable protective sleeve body and an air nozzle, achieves tight coverage and effective protection of the threaded section of the oil pipe, and achieves reliable protection and good vibration resistance of the threaded section of the oil pipe end in complex environments, which can significantly improve the protection level of the threaded section of the oil pipe end. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the threaded protective sleeve of this utility model. Figure 1 ;

[0024] Figure 2 This is a three-dimensional structural diagram of the threaded protective sleeve of this utility model. Figure 2 ;

[0025] Figure 3 This is a three-dimensional structural diagram of the threaded protective sleeve of this utility model. Figure 3 . Detailed Implementation

[0026] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] like Figure 1-3 As shown, a threaded protective sleeve is used to protect the threaded end section of an oil pipe, comprising:

[0028] The protective sleeve body 1 is annular, and the inner wall of the protective sleeve body 1 forms a mating groove 11 that is adapted to the end thread section of the oil pipe. The protective sleeve body 1 is provided with an air-filled cavity.

[0029] Air nozzle 2 is installed on the side wall of the protective sleeve body 1 and communicates with the inflation chamber. Air nozzle 2 is adapted to be connected to an air source to inflate the inflation chamber with gas.

[0030] The protective sleeve body 1 is adapted to be inflated after being fitted into the end threaded section of the oil pipe so that the mating groove 11 fits against the outer wall surface of the end threaded section of the oil pipe to protect the threaded section.

[0031] In this embodiment, as Figure 1-2 As shown, during use, the threaded end of the oil pipe is inserted into the mating groove 11. Then, gas is injected into the inflation chamber through the air nozzle 2, causing the protective sleeve body 1 to expand. The expanded protective sleeve body 1 can tightly fit the threaded surface of the threaded end of the oil pipe, forming a fully enclosed protective layer. This tight contact formed by inflation not only effectively isolates external dust, moisture, and corrosive media, providing reliable sealing protection for the threads and preventing thread corrosion or contamination, but also, the elastic protective sleeve body 1 after inflation can absorb and buffer external vibrations, reducing the impact of vibration or impact on the oil pipe threads. In addition, the air nozzle 2 can serve as both an air inlet and an air outlet, facilitating quick pressure release and disassembly.

[0032] In practical use, before running the tubing down the well, the protective sleeve body 1 is fitted onto the threaded end section of the tubing. Then, air is injected into the inflation chamber through the air nozzle 2. After inflation, the inner wall of the protective sleeve body 1 fits against the outer wall of the threaded end section of the tubing, thus protecting the threaded end section of the tubing. The tubing is then moved to the well location. During this process, the threads of the tubing are protected by the threaded protective sleeve. Then, the well running operation begins. Air is released through the air nozzle 2, and the protective sleeve body 1 is separated from the threaded end section of the tubing. The protective sleeve body 1 is removed, and the well running operation is carried out. The threaded protective sleeve can be reused throughout the entire process.

[0033] The air nozzle 2 is existing technology and will not be described in detail in this embodiment.

[0034] Specifically, such as Figure 1 As shown, the inner wall of the mating groove 11 is threaded.

[0035] Specifically, such as Figure 1 As shown, the protective sleeve body 1 has an abutment ring 13 extending towards the center at the end of the mating groove 11. The abutment ring 13 is adapted to abut against the end face of the inserted oil pipe.

[0036] In this embodiment, as Figure 1 As shown, the abutment ring 13 forms an annular contact surface at the end of the mating groove 11. When the end face of the oil pipe is inserted into this position, its end face abuts against the annular contact surface of the abutment ring 13. This abutment action provides a barrier to further axial penetration of the oil pipe, thereby fixing its axial position in the mating groove 11 at a preset depth.

[0037] Specifically, such as Figure 1 As shown, the outer diameter of the middle part of the outer wall surface of the protective sleeve body 1 is larger than the outer diameter of both ends.

[0038] In this embodiment, as Figure 1 As shown, the outer peripheral wall of the protective sleeve body 1 smoothly transitions and contracts from its central region towards its axial ends, making the outer diameter of the central part of the protective sleeve body 1 larger than the outer diameter of its two ends. When the inflation cavity inside the protective sleeve body 1 is filled with gas and expands, the radial expansion of the central region is relatively large due to its convex shape, while the contracted shape at both ends restricts the radial expansion of the ends to a certain extent. This shape profile ensures that when the protective sleeve body 1 is subjected to external radial contact or collision, the central convex part will first contact the external object, and the contact area will increase as the contact force increases.

[0039] Specifically, such as Figure 1-2 As shown, the end face of the protective sleeve body 1 has a groove 14, and the air nozzle 2 is set in the groove 14.

[0040] Specifically, such as Figure 2 As shown, the groove 14 is provided with an internal thread;

[0041] The threaded protective sleeve also includes a dust cover 3, which has an external thread corresponding to the internal thread of the groove 14.

[0042] Specifically, such as Figure 1 and Figure 3 As shown, the dust cover 3 is attached to the protective cover body 1 via a connecting rope 4.

[0043] In this embodiment, as Figure 1-3 As shown, the groove 14 is formed on one end face of the protective sleeve body 1, and the air nozzle 2 is installed inside the groove 14. This arrangement makes the air nozzle 2 less likely to be directly exposed, providing a certain degree of physical shielding for the air nozzle 2. The inner wall of the groove 14 has internal threads. The threaded protective sleeve includes a dust cover 3, the outer periphery of which has external threads that match the internal threads of the groove 14. Through the threaded engagement, the dust cover 3 can be screwed into and seal the opening of the groove 14 to shield the groove 14 and the air nozzle 2 located therein, preventing dust or foreign objects from entering the groove 14 or contacting the air nozzle 2. The dust cover 3 is connected to the protective sleeve body 1 by a connecting rope 4. This connecting rope 4 allows the dust cover 3 to remain connected to the protective sleeve body 1 after being removed from the groove 14, thereby reducing the possibility of the dust cover 3 being accidentally lost. In this embodiment, the connecting rope 4 is a flexible flat connecting strip. One end of the flexible flat connecting strip is provided with a circular through hole. The dust cover 3 is provided with a connecting shaft that matches the circular through hole. After the connecting shaft is inserted into the through hole, a hinged connection is formed, so that the dust cover 3 can still be connected to the protective cover body through the connecting rope 4 when it is opened, thus preventing the dust cover from being lost.

[0044] Specifically, such as Figure 1-2 As shown, the threaded protective sleeve also includes a parameter marking area 5, which is disposed on the outer surface of the protective sleeve body 1. The parameter marking area 5 is suitable for marking the specification information of the applicable oil pipe thread.

[0045] Specifically, such as Figure 1 As shown, the protective cover body 1 is made of elastic rubber material.

[0046] In this embodiment, as Figure 1-2 As shown, this parameter marking area 5 is set on the outer surface of the protective sleeve body 1 to indicate the specification of the oil pipe thread that matches the threaded protective sleeve. For example, 9-5 / 8 is used in the figure to indicate the outer diameter of the corresponding oil casing.

[0047] The protective sleeve body 1 is made of elastic rubber material. This elastic rubber material allows the protective sleeve body 1 to deform and expand when gas is filled into the inflation chamber to conform to the surface of the oil pipe thread, and to return to or nearly return to its original shape after the gas is expelled. Simultaneously, the elasticity of this material also allows the protective sleeve body 1 to absorb some vibration. Specifically, such as... Figure 1As shown, the mating groove has a taper that matches the taper of the threaded section at the end of the tubing.

[0048] In this embodiment, as Figure 1-2 As shown, the taper of the tapered thread is 1:16.

[0049] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A threaded protective sleeve for protecting the threaded end section of an oil pipe, characterized in that, include: The protective sleeve body (1) is annular, and the inner wall of the protective sleeve body (1) forms a mating groove (11) that is adapted to the end thread section of the oil pipe. The protective sleeve body (1) is provided with an air-filled cavity inside. Air nozzle (2), the air nozzle (2) is installed on the side wall of the protective sleeve body (1) and communicates with the inflation cavity. The air nozzle (2) is adapted to be connected to an air source to inflate the inflation cavity with gas. The protective sleeve body (1) is adapted to be inflated after being fitted into the end threaded section of the oil pipe so that the mating groove (11) fits against the outer wall surface of the end threaded section of the oil pipe to protect the threaded section.

2. The threaded protective sleeve according to claim 1, characterized in that, The inner wall of the mating groove (11) is threaded.

3. The threaded protective sleeve according to claim 1, characterized in that, The protective sleeve body (1) has an abutment ring (13) extending towards the center at the end of the mating groove (11), and the abutment ring (13) is adapted to abut against the end face of the inserted oil pipe.

4. The threaded protective sleeve according to claim 1, characterized in that, The outer diameter of the middle part of the outer wall of the protective sleeve body (1) is larger than the outer diameter of both ends.

5. The threaded protective sleeve according to claim 1, characterized in that, The end face of the protective sleeve body (1) has a groove (14), and the air nozzle (2) is disposed in the groove (14).

6. The threaded protective sleeve according to claim 5, characterized in that, The groove (14) is provided with an internal thread; It also includes a dust cover (3), which has an external thread corresponding to the internal thread of the groove (14).

7. The threaded protective sleeve according to claim 6, characterized in that, The dust cover (3) is attached to the protective cover body (1) via a connecting rope (4).

8. The threaded protective sleeve according to claim 1, characterized in that, It also includes a parameter identification area (5), which is disposed on the outer surface of the protective sleeve body (1) and is adapted to indicate the specification information of the applicable oil pipe thread.

9. The threaded protective sleeve according to claim 1, characterized in that, The protective sleeve body (1) is made of elastic rubber material.

10. The threaded protective sleeve according to claim 1, characterized in that, The mating groove has a taper that matches the taper of the end thread section of the oil pipe.

Images