Piston rod connecting assembly for side door operating mechanism of blowout preventer

Abstract

The utility model discloses a piston rod connecting assembly for a side door operating mechanism of a blowout preventer, which relates to the technical field of oil field operation well control and comprises a blowout preventer body, a piston rod, a bushing and a sealing connecting ring. A mounting cavity is formed in the blowout preventer body; an external thread is arranged on the outer side wall of one end of the piston rod; the outer side wall of the bushing is clamped in the mounting cavity, and an internal thread is arranged on the inner side wall of the bushing and is in threaded connection with the external thread; the sealing connecting ring is located in the installation cavity and abuts against the side wall of the installation cavity in a sealing mode through a sealing piece, and the sealing connecting ring is used for achieving communication between the piston rod and the blowout preventer body. The threads which are originally arranged on the inner side wall of the installation cavity of the blowout preventer body are arranged on the inner side face of the lining through the lining, it is ensured that when the piston rod is connected to the blowout preventer body, scraping damage of the threads can be reduced, the disassembly and assembly difficulty is reduced, the working efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of well control for oil field operations, in particular to a piston rod connecting assembly for a blowout preventer side door operating mechanism. Background Art

[0002] During the drilling process, the side gates must be frequently opened and replaced to accommodate different drill pipes. For hydraulically operated, direct-opening gates, the side gate assembly is connected to the BOP body via two piston rods. These piston rods distribute oil, ensuring a tight seal at the connection to the BOP body. They also act as guide rods when the BOP side gates are open, supporting the weight of the assembly. Conventional connections involve tightening the piston rod's external threads onto the BOP body's internal threads. Due to the significant weight of the side gate assembly in large BOPs and the narrow clearances of conventional threaded connections, assembly requires high precision in lifting the assembly. Even slight deviations can easily lead to scratching and damage between the piston rod and BOP body threads, and in severe cases, severe thread adhesion. Damage to the BOP body threads requires return to the factory for repair, which not only delays normal work progress but also compromises wellhead safety.

[0003] Therefore, in response to the current problems, how to provide a piston rod connection assembly for the blowout preventer side door operating mechanism, which can ensure that the scratch damage of the thread can be reduced when the piston rod is connected to the blowout preventer body, and can also simplify the alignment accuracy and difficulty during the initial installation of the piston rod, reduce the difficulty of disassembly and assembly, improve work efficiency and extend the service life, is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] Therefore, the utility model provides a piston rod connection assembly for a blowout preventer side door operating mechanism, which can ensure that scratch damage to the threads can be reduced when the piston rod is connected to the blowout preventer body, and can also simplify the alignment accuracy and difficulty during the initial installation of the piston rod, reduce the difficulty of disassembly and assembly, improve work efficiency and extend the service life.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A piston rod connection assembly for a blowout preventer side door operating mechanism, comprising:

[0007] A blowout preventer body, wherein the blowout preventer body has a mounting cavity;

[0008] A piston rod, wherein an outer wall at one end of the piston rod is provided with an external thread;

[0009] A bushing, wherein the outer wall of the bushing is clamped in the mounting cavity, and the inner wall of the bushing is provided with an internal thread, and the internal thread is threadably connected to the external thread;

[0010] A sealing connection ring is located in the installation cavity and is in sealing contact with the side wall of the installation cavity through a sealing member. The sealing connection ring is used to achieve communication between the piston rod and the blowout preventer body.

[0011] Through the above technical solution, the utility model provides a piston rod connection assembly for a blowout preventer side door operating mechanism. By using a bushing, the thread originally opened on the inner side wall of the blowout preventer body mounting cavity is opened on the inner side surface of the bushing, thereby ensuring that the scratch damage of the thread can be reduced when the piston rod is connected to the blowout preventer body, reducing the difficulty of disassembly and assembly, improving work efficiency and extending service life.

[0012] Preferably, the piston rod connection assembly for the blowout preventer side door operating mechanism further includes a bushing locator, wherein a first bushing locator installation groove is defined on the inner sidewall of the installation cavity, and a second bushing locator installation groove is defined on the outer sidewall of the bushing. The bushing locator is snap-fitted into the first bushing locator installation groove, and its sidewall can abut against the sidewall of the second bushing locator installation groove. The bushing locator can fix the position of the bushing during piston rod installation to prevent the bushing from rotating with the piston rod.

[0013] Preferably, in the aforementioned piston rod connection assembly for a blowout preventer side door operating mechanism, both the internal and external threads are sawtooth threads. The radial and axial thread pitches of sawtooth threads are larger than those of conventional threads. This allows for connection without requiring high precision during the initial centering of the piston rod. Upon reaching the final thread turn, the tapered surface of the sawtooth threads achieves overall locking, thereby achieving a final, precise, and tight connection.

[0014] Preferably, in the piston rod connection assembly for the blowout preventer side door operating mechanism, an annular projection is fixed to the outer wall of the bushing, and a bushing positioning groove is formed on the inner wall of the installation cavity, and the annular projection is correspondingly engaged in the bushing positioning groove, so that the bushing is always located in the installation cavity and will not fall out.

[0015] Preferably, in the piston rod connection assembly for the blowout preventer side door operating mechanism, the bushing is formed of a plurality of arc-shaped plates spliced together into an annular structure. This allows the bushing to be continuously compressed during the piston rod connection process, ensuring that it remains firmly seated within the installation cavity of the blowout preventer body, eliminating clearance and further improving installation and positioning accuracy.

[0016] Preferably, the piston rod connection assembly for the blowout preventer side door operating mechanism further includes a sealing rubber ring located in the mounting cavity, with one end of the sealing rubber ring abutting against the end surface of the mounting cavity and the other end abutting against the end surface of the sealing connection ring, thereby achieving a seal between the sealing connection ring and the mounting cavity.

[0017] Preferably, in the aforementioned piston rod connection assembly for a blowout preventer side door operating mechanism, the sealing member includes a first sealing ring and a second sealing ring. The first sealing ring is fixed to an end surface of the sealing connection ring adjacent to the piston rod, and the second sealing ring is fixed to an outer wall of the sealing connection ring, thereby achieving a seal between the sealing connection ring, the piston rod, and the mounting cavity.

[0018] Preferably, in the above-mentioned piston rod connection assembly for the blowout preventer side door operating mechanism, a screwing portion is further provided on the outer side wall of the piston rod, which can facilitate the connection and disassembly of the piston rod.

[0019] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a piston rod connection assembly for a blowout preventer side door operating mechanism, which has the following beneficial effects:

[0020] 1. The utility model uses a bushing to open the thread originally opened on the inner side wall of the installation cavity of the blowout preventer body on the inner side of the bushing, which can ensure that the scratch damage of the thread can be reduced when the piston rod is connected to the blowout preventer body, reduce the difficulty of disassembly and assembly, improve work efficiency and extend the service life.

[0021] 2. The present invention designs both the internal thread and the external thread as serrated threads, and utilizes the fact that the radial and axial thread pitches are larger than those of common threads. In this way, connection can be performed without high precision during the initial centering of the piston rod. When the last thread circle is rotated, the tapered surface of the serrated thread is utilized to achieve overall locking, thereby realizing the final precise and tight connection.

[0022] 3. The utility model divides the bushing into multiple arc-shaped plates for splicing. In this way, during the connection process of the piston rod, the bushing is continuously squeezed so that the bushing can always be tightly attached to the installation cavity of the blowout preventer body, eliminating the fitting gap to further improve the installation positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 The accompanying drawing is a structural cross-sectional view of a piston rod connection assembly for a blowout preventer side door operating mechanism provided by the present invention;

[0025] Figure 2 The accompanying drawing is an exploded view of the structure of a piston rod connection assembly for a blowout preventer side door operating mechanism provided by the present invention;

[0026] Figure 3 The accompanying drawing is an exploded view of the structure of the bushing provided by the present invention.

[0027] in:

[0028] 1-piston rod; 11-external thread; 2-bushing; 21-internal thread; 22-annular bump; 23-bushing positioning groove; 24-arc plate; 3-bushing positioning piece; 31-bushing positioning piece installation groove 1; 32-bushing positioning piece installation groove 2; 4-first sealing ring; 5-sealing connecting ring; 6-second sealing ring; 7-sealing rubber ring; 8-blowout preventer body; 9-screwing part. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example:

[0031] See attached Figure 1-3 , the embodiment of the utility model discloses a piston rod connection assembly for a blowout preventer side door operating mechanism, which may include: a blowout preventer body 8, a piston rod 1, a bushing 2 and a sealing connection ring 5;

[0032] The BOP body 8 begins to have a mounting cavity;

[0033] An external thread 11 is provided on the outer side wall of one end of the piston rod 1;

[0034] The outer wall of the bushing 2 is clamped in the installation cavity, and the inner wall of the bushing 2 is provided with an internal thread 21, which is threadedly connected to the external thread 11;

[0035] The sealing connection ring 5 is located in the installation cavity and is in sealing contact with the side wall of the installation cavity through a sealing member. The sealing connection ring 5 is used to achieve communication between the piston rod 1 and the blowout preventer body 8 .

[0036] In some specific examples, a bushing positioning member 3 may also be included, a bushing positioning member installation groove 1 31 is provided on the inner side wall of the installation cavity, a bushing positioning member installation groove 2 32 is provided on the outer side wall of the bushing 2, the bushing positioning member 3 is clamped in the bushing positioning member installation groove 1 31, and its side wall can abut against the side wall of the bushing positioning member installation groove 2 32.

[0037] In a specific embodiment, both the internal thread 21 and the external thread 11 are sawtooth threads.

[0038] In some other embodiments, an annular protrusion 22 is fixed on the outer wall of the bushing 2, and a bushing positioning groove 23 is opened on the inner wall of the installation cavity, and the annular protrusion 22 is correspondingly snapped into the bushing positioning groove 23.

[0039] In a specific embodiment, the bushing 2 can be composed of a plurality of arc-shaped plates 24 spliced into an annular structure.

[0040] Specifically, the bushing 2 can be composed of three arc-shaped plates 24 spliced into an annular structure.

[0041] In some examples, a sealing rubber ring 7 is further included. The sealing rubber ring 7 is located in the installation cavity, and one end of the sealing rubber ring 7 abuts against the end surface of the installation cavity, and the other end abuts against the end surface of the sealing connection ring 5.

[0042] In a specific example, the seal includes a first sealing ring 4 and a second sealing ring 6. The first sealing ring 4 is fixed on an end face of the sealing connecting ring 5 close to the piston rod 1, and the second sealing ring 6 is fixed on the outer side wall of the sealing connecting ring.

[0043] In a specific embodiment, a twisting portion 9 is further provided on the outer side wall of the piston rod 1 .

[0044] The specific operation of the piston rod 1 and the blowout preventer body 8 is the working principle of the ram blowout preventer in the prior art.

[0045] The usage and working principle of the utility model are as follows:

[0046] Before being connected to the blowout preventer body 8, the piston rod 1 has been installed in the side door assembly. Since the structure of the side door assembly is not related to the present invention, for the convenience of description, the side door assembly part is not shown in the schematic diagram.

[0047] During installation, first install the sealing rubber ring 7, install the second sealing ring 6 and the first sealing ring 4 on the sealing connection ring 5, and then install them together into the installation cavity of the blowout preventer body 8. When installing the bushing 2, first install the symmetrical two of its three arc-shaped plates. Before installing the third plate, place the bushing positioning piece 3 in advance. After all three arc-shaped plates of the bushing are installed, install the piston rod 1 and tighten the piston rod 1 until it is fully in contact with the sealing connection ring 5. At the same time, the piston rod 1 tightens the bushing 2 so that the annular protrusion 22 on it is fully in contact with the side of the bushing positioning groove 23 of the blowout preventer body 8.

[0048] During disassembly, unscrew the piston rod 1 and remove the three arc-shaped plates of the bushing 2, the bushing positioning piece 3, the sealing connecting ring 5 and the first sealing ring 4, the second sealing ring 6, and the sealing rubber ring 7 in sequence.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0050] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A piston rod connection assembly for a blowout preventer side door operating mechanism, characterized in that: include: A blowout preventer body (8), wherein a mounting cavity is formed on the blowout preventer body (8); A piston rod (1), wherein an outer wall at one end of the piston rod (1) is provided with an external thread (11); A bushing (2), wherein the outer wall of the bushing (2) is clamped in the installation cavity, and the inner wall of the bushing (2) is provided with an internal thread (21), and the internal thread (21) is threadedly connected to the external thread (11); A sealing connection ring (5) is located in the installation cavity and is in sealing contact with the side wall of the installation cavity through a sealing member. The sealing connection ring (5) is used to achieve communication between the piston rod (1) and the blowout preventer body (8).

2. A piston rod connection assembly for a blowout preventer side door operating mechanism according to claim 1, characterized in that: It also includes a bushing locating member (3), a bushing locating member installation groove (31) is provided on the inner side wall of the installation cavity, and a bushing locating member installation groove (32) is provided on the outer side wall of the bushing (2), and the bushing locating member (3) is clamped in the bushing locating member installation groove (31), and its side wall can abut against the side wall of the bushing locating member installation groove (32).

3. The piston rod connection assembly for the blowout preventer side door operating mechanism according to claim 1, characterized in that: The internal thread (21) and the external thread (11) are both sawtooth threads.

4. The piston rod connection assembly for the blowout preventer side door operating mechanism according to claim 1, characterized in that: An annular protrusion (22) is fixed on the outer wall of the bushing (2), a bushing positioning groove (23) is provided on the inner wall of the installation cavity, and the annular protrusion (22) is correspondingly clamped in the bushing positioning groove (23).

5. The piston rod connection assembly for the blowout preventer side door operating mechanism according to claim 4, characterized in that: The bushing (2) is composed of a plurality of arc-shaped plates spliced together into an annular structure.

6. The piston rod connection assembly for the blowout preventer side door operating mechanism according to claim 1, characterized in that: It also includes a sealing rubber ring (7), which is located in the installation cavity, with one end of the sealing rubber ring abutting against the end face of the installation cavity and the other end abutting against the end face of the sealing connection ring (5).

7. The piston rod connection assembly for a blowout preventer side door operating mechanism according to claim 1, characterized in that: The sealing member comprises a first sealing ring (4) and a second sealing ring (6), wherein the first sealing ring (4) is fixed on an end face of the sealing connection ring (5) close to the piston rod (1), and the second sealing ring (6) is fixed on the outer side wall of the sealing connection ring.

8. The piston rod connection assembly for the blowout preventer side door operating mechanism according to claim 7, characterized in that: A twisting portion (9) is also provided on the outer side wall of the piston rod (1).

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