High-torsion-resistance threaded oil casing for deep-sea ultra-deep well

Abstract

The utility model relates to the field of deep-sea ultra-deep wells, and discloses a deep-sea ultra-deep well high-torsion-resistance threaded oil casing which comprises a right connecting pipe and a left connecting pipe, the left connecting pipe is arranged on the left side of the right connecting pipe, a threaded head is machined on the left side of the right connecting pipe, and internal threads are machined in the threaded head. An external thread is machined on the outer wall of the right side of the left connecting pipe, and the threaded head is in threaded connection with the external thread. According to the deep-sea ultra-deep well high-torsion-resistance threaded oil casing, by arranging the threaded head, after threads are screwed in place, an anti-rotation rod is automatically aligned with a rod groove in the position of a left welding ring to be embedded, at the moment, a positioning bolt is driven in through external force to fix the anti-rotation rod in the rod groove, and it is ensured that the relative positions of a right connecting pipe and a left connecting pipe are locked; meanwhile, the relative positions of the right welding ring and the left welding ring are kept fixed, the torsion resistance and durability are improved, and the problem that threaded connection is prone to loosening or sliding under high torque is solved.

Description

Technical Field

[0001] This utility model relates to the field of deep-sea ultra-deep well technology, specifically to a high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells. Background Technology

[0002] In deep-sea and ultra-deep well environments, casing needs to withstand enormous axial and torque loads. Especially during drilling operations and oil and gas production, threaded connections will generate rotational torque due to high torque loads. If the connection is not stable, it may cause the casing to loosen or even fall off, which will directly affect the safety and stability of the mining operation.

[0003] While current high-torsion threaded oil casings can achieve sealing and connection through threaded connections, since oil casings usually rely solely on the threaded structure for connection, once the thread is tightened to the correct position, the connection lacks further anti-rotation design. High torque loads can easily lead to thread slippage or loosening, resulting in a higher risk of relative rotation of the connection. In long-term high-load operations, misalignment is likely to occur, thereby reducing the overall reliability of the connection.

[0004] Therefore, a high-torsion-resistant threaded oil casing for deep-sea and ultra-deep wells is needed to solve the above-mentioned technical defects. Utility Model Content

[0005] The purpose of this invention is to provide a high-torsion-resistant threaded oil casing for deep-sea and ultra-deep wells, in order to solve the problem mentioned in the background art that threaded connections are prone to loosening or slippage under high torque.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells, comprising a right connecting pipe and a left connecting pipe, wherein a left connecting pipe is provided on the left side of the right connecting pipe, the left side of the right connecting pipe is machined into a threaded head, the threaded head is machined with an internal thread, the right outer wall of the left connecting pipe is machined with an external thread, the threaded head and the external thread are connected by a thread, a protective sleeve is fixedly fitted on the outside of the connection between the right connecting pipe and the left connecting pipe, a right welding ring is welded on the outside of the threaded head, a rotating ring is rotatably fitted on the outside of the right welding ring, two sets of anti-rotation rods are inserted into the left side of the rotating ring, a left welding ring is welded on the outside of the left connecting pipe, rod grooves are machined on the top and bottom of the left welding ring, a positioning bolt is fixedly connected between the anti-rotation rod and the rod groove, and the anti-rotation rod and the left welding ring are fixedly assembled by the positioning bolt.

[0007] As a further technical solution of this utility model, the left side of the anti-rotation rod is inserted into the rod groove, and the rod groove is offset at the top and bottom of the left welding ring.

[0008] As a further technical solution of this utility model, the anti-rotation rod is machined with a reserved hole, and the positioning bolt is assembled in the reserved hole.

[0009] As a further technical solution of this utility model, the anti-rotation rod is a "Z"-shaped metal rod.

[0010] As a further technical solution of this utility model, the right welding ring and the rotating ring are concentric circles, and the right welding ring and the rotating ring can rotate relative to each other.

[0011] As a further technical solution of this utility model, the outer wall of the rotating ring is machined with a concave track, the inner wall of the protective sleeve is welded with a protrusion, and the side of the protrusion that fits with the rotating ring is machined with a bead groove.

[0012] As a further technical solution of this utility model, the ball groove and the track are positioned correspondingly, and rolling balls are embedded between the ball groove and the track.

[0013] As a further technical solution of this utility model, the protective sleeve consists of two sets of openable semi-rings, with locking bolts fixedly connected to the semi-rings. The protective sleeve has an inner layer, and the inner wall of the inner layer is machined with annularly distributed rod holes, into which shaping rods are inserted.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the high torsion resistance threaded oil casing for deep-sea and ultra-deep wells not only improves torsion resistance and durability, and will not easily loosen or slip under high torque, but also reduces the weight of the protective sleeve and reduces the burden on the oil casing when used in deep-sea and ultra-deep wells. In addition, it solves the problem of difficult disassembly of traditional oil casing connection components due to corrosion.

[0015] (1) By setting a threaded head, external thread, anti-rotation rod and positioning bolt, a stable connection between the right connecting pipe and the left connecting pipe is achieved. The right connecting pipe and the left connecting pipe are connected by threaded head and external thread. After the thread is screwed in place, the anti-rotation rod automatically aligns with the rod groove at the left welding ring and is embedded. At this time, the positioning bolt is driven in by external force to fix the anti-rotation rod in the rod groove, ensuring that the relative position of the right connecting pipe and the left connecting pipe is locked, avoiding the relative rotation problem caused by high torque load, and keeping the relative position of the right welding ring and the left welding ring fixed, improving the anti-torsion performance and durability, and solving the problem that traditional threaded connections are prone to loosening or slippage under high torque.

[0016] (2) By setting up a protective sleeve, interlayer and shaping rod, the protective sleeve is used to wrap and protect the connection between the right connecting pipe and the left connecting pipe in all directions, so as to avoid the erosion and adhesion of impurities, mud and sand in the deep sea environment to the connection. The protective sleeve is processed with an interlayer and multiple sets of shaping rods are set to support the internal structure of the protective sleeve. The interlayer reduces the overall weight while ensuring that the protective sleeve has sufficient support strength, effectively reducing the burden on the oil casing when used in deep sea ultra-deep wells.

[0017] (3) By setting a rotating ring, anti-rotation rod, rod groove and ball bearings, a rotatable rotating ring is set on the outside of the right welding ring. When disassembly is required after the work is completed, the positioning bolt is removed from the rod groove first. At this time, the rotating ring is rotated, and the anti-rotation rod is driven out of the rod groove by the rotating ring. This solves the problem of corrosion or adhesion that may occur after the high anti-torsion threaded oil casing has been working in the deep sea environment for a long time. The rolling of the ball bearings reduces the operating resistance, making the rotation of the rotating ring smoother. This solves the problem of difficult disassembly of traditional oil casing connection parts due to corrosion. Attached Figure Description

[0018] Figure 1 This is a frontal cross-sectional view of the present invention.

[0019] Figure 2 This is a side view of the left welding ring structure of this utility model;

[0020] Figure 3 For the present utility model Figure 1 Enlarged cross-sectional view of point A in the middle section;

[0021] Figure 4 This is a side view of the protective sleeve structure of this utility model.

[0022] In the diagram: 1. Right connecting pipe; 2. Threaded head; 3. Locking bolt; 4. Anti-rotation rod; 5. Positioning bolt; 6. Rod groove; 7. Protective sleeve; 8. Left connecting pipe; 9. Left welding ring; 10. External thread; 11. Right welding ring; 12. Rotary ring; 13. Protrusion; 14. Bead groove; 15. Track; 16. Ball; 17. Shaping rod; 18. Rod hole; 19. Interlayer. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-4This utility model provides an embodiment of a high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells, comprising a right connecting pipe 1 and a left connecting pipe 8. The left connecting pipe 8 is located on the left side of the right connecting pipe 1. A threaded head 2 is machined on the left side of the right connecting pipe 1, with internal threads inside the threaded head 2. An external thread 10 is machined on the outer wall of the right side of the left connecting pipe 8. The threaded head 2 and the external thread 10 are connected by threads. A protective sleeve 7 is fixedly fitted onto the outside of the connection between the right connecting pipe 1 and the left connecting pipe 8. A right welding ring 11 is welded to the outside of the threaded head 2. A rotating ring 12 is rotatably connected. Two sets of anti-rotation rods 4 are inserted into the left side of the rotating ring 12. A left welding ring 9 is welded to the outside of the left connecting pipe 8. The top and bottom of the left welding ring 9 are machined with rod grooves 6. A positioning bolt 5 is fixedly connected between the anti-rotation rod 4 and the rod groove 6. The anti-rotation rod 4 and the left welding ring 9 are fixedly assembled by the positioning bolt 5. The left side of the anti-rotation rod 4 is inserted into the rod groove 6. The rod groove 6 is set to be staggered at the top and bottom of the left welding ring 9. A reserved hole is machined in the anti-rotation rod 4. The positioning bolt 5 is assembled in the reserved hole. The anti-rotation rod 4 is a "Z" shaped metal rod.

[0025] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, a stable connection between the right connecting pipe 1 and the left connecting pipe 8 is achieved by setting a threaded head 2, an external thread 10, an anti-rotation rod 4, and a positioning bolt 5. The right connecting pipe 1 and the left connecting pipe 8 are connected by threads through the threaded head 2 and the external thread 10. After the threads are tightened to the correct position, the anti-rotation rod 4 automatically aligns with the rod groove 6 at the left welding ring 9 and is embedded. At this time, the positioning bolt 5 is driven in by external force to fix the anti-rotation rod 4 in the rod groove 6, ensuring that the relative positions of the right connecting pipe 1 and the left connecting pipe 8 are locked.

[0026] The protective sleeve 7 consists of two sets of openable semi-rings, with locking bolts 3 fixedly connected at the semi-rings. The protective sleeve 7 has an inner layer 19, and the inner wall of the inner layer 19 is machined with annularly distributed rod holes 18, with shaping rods 17 inserted into the rod holes 18.

[0027] Specifically, such as Figure 1 and Figure 4 As shown, the protective sleeve 7, the interlayer 19 and the shaping rod 17 are provided. The protective sleeve 7 is used to wrap and protect the connection between the right connecting pipe 1 and the left connecting pipe 8 in all directions, so as to avoid the erosion and adhesion of impurities, mud and sand in the deep sea environment to the connection. The protective sleeve 7 has an interlayer 19 processed inside, and multiple sets of shaping rods 17 are provided to support the internal structure of the protective sleeve 7.

[0028] The right welding ring 11 and the rotating ring 12 are concentric circular structures. The right welding ring 11 and the rotating ring 12 can rotate relative to each other. The outer wall of the rotating ring 12 is machined with a concave track 15. The inner wall of the protective sleeve 7 is welded with a protrusion 13. The side of the protrusion 13 that is in contact with the rotating ring 12 is machined with a ball groove 14. The ball groove 14 and the track 15 are in corresponding positions. A ball 16 is embedded between the ball groove 14 and the track 15.

[0029] Specifically, such as Figure 1 and Figure 3 As shown, the right welding ring 11 is equipped with a rotating ring 12, an anti-rotation rod 4, a rod groove 6, and a ball bearing 16. The rotating ring 12 is rotatable on the outside of the right welding ring 11. When disassembly is required after the work is completed, the positioning bolt 5 is first removed from the rod groove 6. At this time, the rotating ring 12 is rotated, and the anti-rotation rod 4 is dislodged from the rod groove 6 by the rotating ring 12. The rolling of the ball bearing 16 reduces the operating resistance, making the rotation of the rotating ring 12 smoother.

[0030] Working principle: A secure connection between the right connecting pipe 1 and the left connecting pipe 8 is achieved through a threaded head 2, an external thread 10, an anti-rotation rod 4, and a positioning bolt 5. The right connecting pipe 1 and the left connecting pipe 8 are connected by threads 2 and external threads 10. After the threads are tightened to the correct position, the anti-rotation rod 4 automatically aligns with the groove 6 at the left welding ring 9 and embeds itself. At this point, the positioning bolt 5 is driven in by external force to fix the anti-rotation rod 4 in the groove 6, ensuring that the relative positions of the right connecting pipe 1 and the left connecting pipe 8 are locked, preventing relative rotation due to high torque loads. Simultaneously, the relative positions of the right welding ring 11 and the left welding ring 9 remain fixed. A protective sleeve 7, an interlayer 19, and a shaping rod 17 are also included. The protective sleeve 7 provides comprehensive wrapping and protection for the connection between the right connecting pipe 1 and the left connecting pipe 8. To prevent impurities and silt from the deep-sea environment from eroding and adhering to the joints, the protective sleeve 7 has an internal interlayer 19 and multiple sets of shaping rods 17 to support the internal structure of the protective sleeve 7. The interlayer 19 reduces the overall weight while ensuring sufficient support strength for the protective sleeve 7. By incorporating a rotating ring 12, anti-rotation rod 4, rod groove 6, and ball bearings 16, and with a rotatable rotating ring 12 on the outside of the right welding ring 11, when disassembly is required after work, the positioning bolt 5 is first removed from the rod groove 6. Then, rotating the rotating ring 12 causes the anti-rotation rod 4 to disengage from the rod groove 6. This solves the problem of rust or adhesion that may occur in high-torsion threaded oil casing after long-term operation in the deep-sea environment. The rolling of the ball bearings 16 reduces operating resistance, making the rotation of the rotating ring 12 smoother.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-torsion-resistant threaded oil casing for deep-sea and ultra-deep wells, comprising a right connecting pipe (1) and a left connecting pipe (8), characterized in that: A left connecting pipe (8) is provided on the left side of the right connecting pipe (1). The left side of the right connecting pipe (1) is machined into a threaded head (2), and the threaded head (2) has an internal thread. The right outer wall of the left connecting pipe (8) has an external thread (10). The threaded head (2) and the external thread (10) are connected by threads. A protective sleeve (7) is fixedly fitted on the outside of the connection between the right connecting pipe (1) and the left connecting pipe (8). A right thread is welded to the outside of the threaded head (2). Welding ring (11), the right welding ring (11) is rotatably sleeved with a rotating ring (12), two sets of anti-rotation rods (4) are inserted into the left side of the rotating ring (12), the left connecting pipe (8) is welded with a left welding ring (9), the top and bottom of the left welding ring (9) are machined with rod grooves (6), the anti-rotation rods (4) and the rod grooves (6) are fixedly connected with positioning bolts (5), the anti-rotation rods (4) and the left welding ring (9) are fixedly assembled by positioning bolts (5).

2. The deep-sea ultra-deep well high-torsion-resistant threaded oil casing according to claim 1, characterized in that: The anti-rotation rod (4) is inserted into the rod groove (6) on the left side, and the rod groove (6) is staggered at the top and bottom of the left welding ring (9).

3. The deep-sea ultra-deep well high-torsion-resistant threaded oil casing according to claim 1, characterized in that: The anti-rotation rod (4) has a pre-drilled hole, and the positioning bolt (5) is assembled into the pre-drilled hole.

4. The deep-sea ultra-deep well high-torsion-resistant threaded oil casing according to claim 1, characterized in that: The anti-rotation rod (4) is a "Z"-shaped metal rod.

5. A high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells according to claim 1, characterized in that: The right welding ring (11) and the rotating ring (12) are concentric circles, and the right welding ring (11) and the rotating ring (12) can rotate relative to each other.

6. A high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells according to claim 1, characterized in that: The outer wall of the rotating ring (12) is machined with a concave track (15), and the inner wall of the protective sleeve (7) is welded with a protrusion (13). The side of the protrusion (13) that is in contact with the rotating ring (12) is machined with a bead groove (14).

7. A high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells according to claim 6, characterized in that: The bead groove (14) and the track (15) are positioned correspondingly, and a ball (16) is fitted between the bead groove (14) and the track (15).

8. A high-torsion-resistant threaded oil casing for deep-sea ultra-deep wells according to claim 1, characterized in that: The protective sleeve (7) consists of two sets of openable semi-rings, with locking bolts (3) fixedly connected to the semi-rings. The protective sleeve (7) has an inner layer (19), and the inner wall of the inner layer (19) is machined with annularly distributed rod holes (18). A shaping rod (17) is inserted into the rod holes (18).

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