Safety joint capable of being reversely buckled

Abstract

The utility model discloses a safety joint capable of being inversely buckled, which comprises an upper safety joint and a lower safety joint, an external thread groove is arranged on the outer side surface of the upper safety joint, an internal thread groove is arranged on the inner side surface of the lower safety joint, and the internal thread groove is in threaded fit with the external thread groove. The upper safety connector and the lower safety connector are fixed in a threaded mode, and a lubricating oil cavity is formed in the inner wall of the lower safety connector and comprises a plurality of sets of flow dividing cavities. According to the utility model, the lubricating oil cavity is additionally arranged, and the lubricating oil in the lubricating oil cavity is filled at the threaded connection part, so that the threaded connection part is fully lubricated, the torque force required by thread rotation is reduced, the tubular column is relatively convenient to rotate, and even if the structure of the tubular column is relatively complex, the safety joint can be easily separated; slurry inside and outside the safety connector is isolated through the upper O-shaped sealing ring and the lower O-shaped sealing ring, and even if high pumping pressure circulation is carried out, the external thread groove and the internal thread groove of the safety connector cannot be eroded by the slurry.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well safety joints, in particular to an inverted safety joint. Background Art

[0002] In oil and gas development operations, safety joints are special tools used for downhole operations and production pipes. When an accident occurs in the downhole pipe, the stuck pipe can be disconnected from the safety joint, the tools and pipe above the safety joint can be retrieved, and the lower drill string and tools can be processed, thus creating good conditions for further handling of the accident.

[0003] Conventional shear-type safety joints rely only on shear nails to connect the upper and lower joints. During completion operations, they are easily affected by operations and well conditions, resulting in disconnection in the middle, thus causing operational accidents. Conventional inverted safety joints have too tight connections between the upper and lower joints, requiring a large torque force when rotating the tubing. When the structure of the tubing is complex, it is difficult to disengage due to insufficient torque transmission. Summary of the invention

[0004] The purpose of the utility model is to provide a buckled safety joint to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a buckled safety joint, comprising an upper safety joint and a lower safety joint, wherein the outer side surface of the upper safety joint is provided with an external thread groove, the inner side surface of the lower safety joint is provided with an internal thread groove, and the internal thread groove and the external thread groove are threadedly matched, and the upper safety joint and the lower safety joint are threadedly fixed, and a lubricating oil chamber is provided inside the inner wall of the lower safety joint, and the lubricating oil chamber includes a multi-component flow chamber.

[0006] Wherein, a threaded connection is formed between the internal thread groove and the external thread groove, and the end of the diversion cavity is connected to the threaded connection.

[0007] Wherein, the interiors of the lubricating oil chamber and the diversion chamber are both filled with lubricating oil liquid.

[0008] Wherein, a welding block is arranged at the top of the lubricating oil chamber, and the welding block is fixedly connected to the lower safety joint by welding.

[0009] Wherein, an upper O-ring is arranged above the upper safety joint and the lower safety joint.

[0010] Wherein, a lower O-ring is arranged below between the upper safety joint and the lower safety joint.

[0011] Wherein, an upper connecting head is arranged at the top end of the upper safety joint, and an integrally formed structure is arranged between the upper connecting head and the upper safety joint.

[0012] Wherein, a lower connecting head is arranged at the bottom end of the lower safety joint, and an integrally formed structure is arranged between the lower connecting head and the lower safety joint.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model is provided with a lubricating oil chamber, and the lubricating oil inside the lubricating oil chamber is filled in the threaded connection, so as to fully lubricate the threaded connection and reduce the torque force required when the thread rotates. It is more convenient to rotate the pipe column, and even if the structure of the pipe column is more complicated, the safety joint can be easily disengaged.

[0015] The utility model isolates the mud inside and outside the safety joint by the upper O-ring and the lower O-ring. Even in high pump pressure circulation, the external thread groove and the internal thread groove of the safety joint will not be eroded by the mud, and the leakage of lubricating oil is prevented at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 A partial enlarged view of area A in the middle;

[0018] Figure 3 for Figure 1 A partial enlarged view of area B in the middle;

[0019] Figure 4 It is the front view of the utility model.

[0020] In the figure: 1. upper safety joint; 2. lower safety joint; 3. external thread groove; 4. internal thread groove; 5. lubricating oil chamber; 6. diverter chamber; 7. welding block; 8. upper O-ring; 9. lower O-ring; 10. upper connector; 11. lower connector. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4The utility model provides a technical solution: a safety joint that can be buckled upside down, including an upper safety joint 1 and a lower safety joint 2, an outer surface of the upper safety joint 1 is provided with an external thread groove 3, and an inner surface of the lower safety joint 2 is provided with an internal thread groove 4, and the internal thread groove 4 and the external thread groove 3 are threadedly matched, and the upper safety joint 1 and the lower safety joint 2 are threadedly fixed, the connection method is simple, and the upper safety joint 1 and the lower safety joint 2 are convenient to install and disassemble. The inner wall of the lower safety joint 2 is provided with a lubricating oil chamber 5, and the lubricating oil chamber 5 includes a multi-component flow chamber 6. The upper safety joint 1 and the lower safety joint 2 together constitute an inverted safety joint, which is installed at the position where the pipe string needs to be disengaged, and can transmit torque and withstand various composite stresses together with the pipe string. When a drill stuck accident occurs, the upper safety joint 1 and the lower safety joint 2 are separated, so that the pipe string structure is disconnected from the safety joint, and after the upper pipe string is taken out, a special tool is lowered to salvage the lower pipe string, thereby creating good conditions for further handling of the accident.

[0023] Among them, the threaded connection method replaces the shear-type safety joint, and the joint has a strong load-bearing capacity and can withstand a large torque, thereby avoiding the safety joint from breaking off midway and causing operational accidents.

[0024] A threaded connection is formed between the internal thread groove 4 and the external thread groove 3 , and the end of the diversion cavity 6 is connected to the threaded connection.

[0025] The lubricating oil chamber 5 and the diverter chamber 6 are both filled with lubricating oil.

[0026] Among them, lubricating oil is filled in the threaded connection to fully lubricate the threaded connection, reduce the torque required when the thread rotates, and it is more convenient to rotate the pipe column. Even if the structure of the pipe column is more complicated, the safety joint can be easily disengaged.

[0027] Among them, a welding block 7 is provided at the top of the lubricating oil chamber 5, and the welding block 7 is welded and fixedly connected to the lower safety joint 2. The lubricating oil liquid is filled into the interior of the lubricating oil chamber 5 at the reserved opening. After the filling is completed, the welding block 7 is welded and fixed to the lower safety joint 2 to close the reserved opening, so that the lubricating oil chamber 5 forms a closed structure to prevent the leakage of the lubricating oil liquid and prevent external impurities from entering the interior of the lubricating oil chamber 5.

[0028] An upper O-ring 8 is provided above the upper safety joint 1 and the lower safety joint 2 .

[0029] Wherein, a lower O-ring 9 is arranged below between the upper safety joint 1 and the lower safety joint 2 .

[0030] Among them, the upper and lower parts of the threaded connection are sealed by the upper O-ring 8 and the lower O-ring 9, and the mud inside and outside the safety joint is isolated by the upper O-ring 8 and the lower O-ring 9. Even in high pump pressure circulation, the external thread groove 3 and the internal thread groove 4 of the safety joint will not be eroded by the mud, and the leakage of lubricating oil can be prevented at the same time.

[0031] Among them, an upper connector 10 is arranged at the top of the upper safety joint 1, and the upper connector 10 and the upper safety joint 1 are arranged as an integrally formed structure, and the upper connector 10 of the upper safety joint 1 is connected to the drill pipe through a drill pipe female buckle.

[0032] Among them, a lower connecting head 11 is arranged at the bottom end of the lower safety joint 2, and the lower connecting head 11 and the lower safety joint 2 are arranged as an integrally formed structure, and the lower safety joint 2 is fixedly connected to the pipe column structure through the lower connecting head 11.

[0033] Working principle: When in use, the upper connector 10 of the upper safety joint 1 is connected to the drill pipe through the drill pipe female buckle, and the lower safety joint 2 is fixedly connected to the pipe column structure through the lower connector 11. The upper safety joint 1 and the lower safety joint 2 together constitute an inverted safety joint, which is installed at the position where the pipe column needs to be disengaged. When a drill sticking accident occurs, the right-hand rotation of the drill pipe is converted into a left-hand rotation movement of the stuck pipe column to loosen the connecting thread, separate the upper safety joint 1 and the lower safety joint 2, and disconnect the pipe column structure from the safety joint. After taking out the upper pipe column, a special tool is lowered to salvage the lower pipe column, and lubricating oil is filled in the threaded connection to fully lubricate the threaded connection, thereby reducing the torque required for thread rotation and making it more convenient to rotate the pipe column. Even if the structure of the pipe column is more complicated, the safety joint can be easily disengaged.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A buckled safety joint, comprising an upper safety joint (1) and a lower safety joint (2), characterized in that: An external thread groove (3) is provided on the outer side surface of the upper safety joint (1), an internal thread groove (4) is provided on the inner side surface of the lower safety joint (2), and the internal thread groove (4) and the external thread groove (3) are threadedly matched, and the upper safety joint (1) and the lower safety joint (2) are threadedly fixed, and a lubricating oil chamber (5) is provided inside the inner wall of the lower safety joint (2), and the lubricating oil chamber (5) includes a multi-component flow chamber (6).

2. The inverted safety joint according to claim 1, characterized in that: A threaded connection is formed between the internal thread groove (4) and the external thread groove (3), and the end of the diversion cavity (6) is connected to the threaded connection.

3. The buckled safety joint according to claim 1, characterized in that: The interiors of the lubricating oil chamber (5) and the diverter chamber (6) are both filled with lubricating oil liquid.

4. The buckled safety joint according to claim 1, characterized in that: A welding block (7) is provided at the top end of the lubricating oil chamber (5), and the welding block (7) is fixedly connected to the lower safety joint (2) by welding.

5. The buckled safety joint according to claim 1, characterized in that: An upper O-type sealing ring (8) is provided above the upper safety joint (1) and the lower safety joint (2).

6. The buckled safety joint according to claim 1, characterized in that: A lower O-type sealing ring (9) is provided below the upper safety joint (1) and the lower safety joint (2).

7. The buckled safety joint according to claim 1, characterized in that: An upper connecting head (10) is provided at the top end of the upper safety joint (1), and an integrally formed structure is provided between the upper connecting head (10) and the upper safety joint (1).

8. The buckled safety joint according to claim 1, characterized in that: A lower connecting head (11) is provided at the bottom end of the lower safety joint (2), and an integrally formed structure is provided between the lower connecting head (11) and the lower safety joint (2).

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