A casing lifting sub dismounting device

Abstract

The utility model relates to the technical field of downhole tools, especially to a casing lifting nipple dismounting device to alleviate the poor engagement effect of the existing equipment and the lifting nipple, the problem of easy skidding, and the inability to use a force lever, leading to the very difficult dismounting of the lifting nipple with rusted connecting threads. The device comprises an arc-shaped clamp; two arc-shaped clamps are arranged correspondingly, and the two form a cavity for accommodating the lifting nipple; and one side of the arc-shaped clamp at the joint with the lifting nipple is provided with a plurality of movable clamping blocks. By counterclockwise rotating the arc-shaped clamp, the movable clamping blocks are reversely rotated and extended into the cavity, increasing the contact area between the movable clamping blocks and the lifting nipple, thereby improving the firmness of the connection, and a clamping groove for mounting the force lever is further provided to facilitate stable dismounting operation.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology, and in particular to a disassembly device for a casing riser section. Background Technology

[0002] As oilfields have been in operation for a long time, the wellhead Christmas trees have aged due to weathering and corrosion. Many oil and water wells have experienced problems with their casing riser sections, making well workover operations difficult. Many oil and water well workovers also require replacement of the wellhead Christmas trees and casing riser sections. Existing disassembly tools are ineffective for corrosion of the casing riser sections and rust on the connecting threads, resulting in time-consuming and labor-intensive work.

[0003] Publication No. CN203515390U discloses a lifting short section shackle device, but it still has obvious defects in use:

[0004] 1. The internal tooth structure is fixed, resulting in a small contact area with the raised septum, poor occlusal effect, and a tendency to slip.

[0005] 2. The inability to use a lever makes it extremely difficult to disassemble the raised section with corroded connecting threads. Utility Model Content

[0006] To alleviate the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] This utility model provides a disassembly device for a sleeve riser section, including an arc-shaped clamp;

[0008] Two arc-shaped clamps are set up opposite each other, and the two together form a cavity to accommodate the raised short section;

[0009] Multiple movable locking blocks are provided on one side where the arc-shaped clamp connects to the lifting section.

[0010] Furthermore,

[0011] An arc-shaped groove is provided on one side where the arc-shaped clamp meets the lifting section;

[0012] The depth of the arc-shaped groove gradually increases counterclockwise.

[0013] Furthermore,

[0014] The movable card block has an arc-shaped surface structure that matches the arc-shaped groove.

[0015] Furthermore,

[0016] Multiple sets of locking teeth are provided on one side where the movable locking block connects to the lifting short section;

[0017] The direction in which the tooth tip points is consistent with the direction in which the depth of the arc-shaped groove expands.

[0018] Furthermore,

[0019] An anti-detachment pressure plate is provided at each of the upper and lower ends of the arc-shaped groove;

[0020] The upper and lower ends of the movable block are each provided with a protrusion that mates with the anti-detachment pressure plate;

[0021] The top of the anti-detachment pressure plate is detachably connected to the top of the arc-shaped clamp;

[0022] The anti-detachment pressure plate is U-shaped, with the inner wall of one side abutting against the protrusion, and the inner wall of the other side abutting against the outer wall of the arc-shaped clamp on the side away from the lifting section.

[0023] Furthermore,

[0024] A compression spring is provided at each of the upper and lower ends of the movable block;

[0025] One end of the compression spring abuts against the narrow end of the arc-shaped groove, and the other end abuts against the protrusion.

[0026] Furthermore,

[0027] The curvature of the side where the movable locking block connects to the lifting section is consistent with the curvature of the outer wall of the lifting section.

[0028] Furthermore,

[0029] After the two arc-shaped clamps are assembled, the inner wall of the arc-shaped clamps smoothly transitions with the inner wall of the movable clamp block.

[0030] Furthermore,

[0031] Each of the two arc-shaped clamps has a slot for mounting the extension rod on the side opposite to the lifting section.

[0032] The beneficial effects of the disassembly device for the sleeve riser section in this utility model are analyzed as follows:

[0033] This utility model provides a disassembly device for a sleeve riser section, including an arc-shaped clamp; two arc-shaped clamps are correspondingly arranged, and the two together form a cavity to accommodate the riser section; multiple movable locking blocks are provided on one side of the arc-shaped clamps where they connect with the riser section.

[0034] By rotating the arc-shaped clamp counterclockwise, the movable clamp block rotates in the opposite direction and extends into the cavity, increasing the contact area between it and the raised section, thereby improving the firmness of the connection and facilitating stable assembly and disassembly operations. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the disassembly device for the sleeve lifting section provided in this embodiment of the utility model;

[0037] Figure 2 This is a schematic diagram of the result of using an arc-shaped clamp;

[0038] Figure 3 This is a schematic diagram of the results of the active card block.

[0039] icon:

[0040] 100 - Arc-shaped clamp; 110 - Arc-shaped groove;

[0041] 200 - Cavity;

[0042] 300 - Active block; 310 - Clip; 320 - Protrusion;

[0043] 400-Anti-detachment tablets;

[0044] 500 - Card slot. Detailed Implementation

[0045] Because the existing sleeve riser shackle device has a small contact area and poor engagement after the internal thread is fixed to the riser, it is prone to slippage, which affects the disassembly operation. Furthermore, it cannot install the force lever, making the disassembly process very difficult when the threads are corroded.

[0046] In view of this, such as Figures 1 to 3 As shown, this solution provides a disassembly device for a sleeve riser sub, including an arc-shaped clamp 100;

[0047] Two arc-shaped clamps 100 are set correspondingly, and the two together form a cavity 200 to accommodate the raised short section;

[0048] Multiple movable locking blocks 300 are provided on one side where the arc-shaped clamp 100 connects with the lifting section;

[0049] Two arc-shaped clamps 100 are respectively provided with a slot 500 for mounting the force-adding rod on the side opposite to the lifting section.

[0050] Specifically, when using this device to disassemble the sleeve riser section, first, place the two arc-shaped clamps 100 on the outside of the riser section, and then detachably connect the two arc-shaped clamps 100 with bolts to allow the riser section to be inserted into the cavity 200. Then, rotate the disassembly device to make the teeth inside the movable clamp 300 make tight contact with the outer wall of the riser section, so as to ensure that the device is firmly connected to the riser section, thereby facilitating subsequent disassembly operations.

[0051] In this design, an arc-shaped groove 110 is provided on one side where the arc-shaped clamp 100 connects with the lifting section;

[0052] The depth of the arc-shaped groove 110 gradually increases counterclockwise;

[0053] The movable card block 300 has an arc surface structure that mates with the arc-shaped groove 110;

[0054] Multiple sets of locking teeth 310 are provided on one side where the movable locking block 300 connects with the lifting short section;

[0055] The direction of the tooth tip of the clasp 310 is consistent with the direction of the depth expansion of the arc-shaped groove 110;

[0056] An anti-detachment pressure plate 400 is provided at each of the upper and lower ends of the arc-shaped groove 110;

[0057] The upper and lower ends of the movable card block 300 are respectively provided with a protrusion 320 that cooperates with the anti-detachment pressure plate 400;

[0058] The top of the anti-detachment pressure plate 400 is detachably connected to the top of the arc-shaped clamp 100;

[0059] The anti-detachment pressure plate 400 is U-shaped, with its inner wall on one side abutting against the protrusion 320, and its inner wall on the other side abutting against the outer wall of the arc-shaped clamp 100 on the side away from the lifting section.

[0060] Specifically, the arc-shaped groove 110 is a dovetail groove with a depth difference of no less than 5mm at its two ends. The arc length is 3-10mm longer than the movable locking block 300. The arc-shaped clamp 100 has deep holes at the upper and lower ends of the center of each arc-shaped groove 110 for installing the anti-detachment pressure plate 400. The anti-detachment pressure plate 400 at the upper and lower ends limits the movable locking block 300 to prevent it from coming out of the arc-shaped groove 110. After the entire device is locked on the outer wall of the lifting section and rotated in the opposite direction, the movable locking block 300 slides along the arc-shaped groove 110 in a direction opposite to that of the arc-shaped clamp 100. Due to the different depths of the arc-shaped groove 110, the arc-shaped groove 110 forms a climbing state, thereby making the connection between the locking tooth 310 and the lifting section tighter.

[0061] In this design, a compression spring is provided at each of the upper and lower ends of the movable card block 300;

[0062] One end of the compression spring abuts against the narrow end of the arc-shaped groove 110, and the other end abuts against the protrusion 320.

[0063] Specifically, with Figure 3 Taking the perspective as an example, the protrusion 320 is set at the upper and lower ends of the movable block 300, and the upper and lower ends on the right side have notches to accommodate the compression spring. The notches correspond to the shallower part of the arc-shaped groove 110. The compression spring is set in the notch, with one side abutting against the protrusion 320 and the other side abutting against the arc-shaped groove 110. During the process of the movable block 300 climbing, the compression spring is squeezed. When the movable block 300 is released after the disassembly of the lifting section is completed, the elastic force of the compression spring causes the movable block 300 to return to its original position.

[0064] Preferably, the curvature of the side where the movable locking block 300 connects with the lifting section is consistent with the curvature of the outer wall of the lifting section;

[0065] After the two arc-shaped clamps 100 are assembled, the inner wall of the arc-shaped clamp 100 and the inner wall of the movable clamp 300 are smoothly connected, so that the initial assembly of the two arc-shaped clamps 100 is more secure and tight, and the connection is not unstable due to gaps at the connection of the two arc-shaped clamps 100.

[0066] The dimensions of the arc-shaped clamp 100 and the movable clamp 300 are designed to correspond to the dimensions of the lifting section. This device is used in a one-to-one correspondence with the lifting section. The material used in this device should be able to ensure no deformation under a torque of at least 3KN*m. The material selected for the movable clamp 300 should be greater than No. 45 steel, and the other materials should be greater than No. 20 steel. After the device is manufactured, it needs to be treated for corrosion and rust prevention.

[0067] This solution has at least the following beneficial effects:

[0068] This solution provides a sleeve riser disassembly device that effectively solves the problems of small contact area, poor engagement, and inability to install the force-applying lever in existing devices. This avoids slippage and simplifies disassembly in cases of thread corrosion. By designing an arc-shaped clamp with movable locking blocks and teeth, and in conjunction with an adjustable spring mechanism, the device automatically increases the tightness with the outer wall of the riser when rotated counterclockwise, ensuring a secure connection, facilitating disassembly, adapting to different working environments, and improving work efficiency and operational safety.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A disassembly device for a sleeve riser section, characterized in that: Including curved clamps (100); Two of the aforementioned arc-shaped clamps (100) are respectively provided, and the two together form a cavity (200) for accommodating the raised short section. Multiple movable locking blocks (300) are provided on one side of the arc-shaped clamp (100) where it connects with the raised section. An arc-shaped groove (110) is provided on one side of the arc-shaped clamp (100) where it connects with the lifting section. The depth of the arc-shaped groove (110) gradually increases counterclockwise.

2. The disassembly device for the sleeve riser section according to claim 1, characterized in that: The movable card block (300) has an arc surface structure that mates with the arc groove (110).

3. The disassembly device for the sleeve riser section according to claim 2, characterized in that: Multiple sets of locking teeth (310) are provided on one side of the movable locking block (300) where it connects with the raised section; The direction of the tooth tip of the retaining tooth (310) is consistent with the direction of the depth expansion of the arc-shaped groove (110).

4. The disassembly device for the sleeve riser section according to claim 3, characterized in that: An anti-detachment pressure plate (400) is provided at the upper and lower ends of the arc-shaped groove (110). The upper and lower ends of the movable card block (300) are respectively provided with a protrusion (320) that cooperates with the anti-detachment pressure plate (400); The top of the anti-detachment pressure plate (400) is detachably connected to the top of the arc-shaped clamp (100); The anti-detachment pressure plate (400) is U-shaped, with one inner wall abutting against the protrusion (320) and the other inner wall abutting against the outer wall of the arc-shaped clamp (100) away from the lifting section.

5. The disassembly device for the sleeve riser section according to claim 4, characterized in that: The movable card block (300) is provided with a compression spring at both its upper and lower ends; One end of the compression spring abuts against the narrow end of the arc-shaped groove (110), and the other end abuts against the protrusion (320).

6. The disassembly device for the sleeve riser section according to claim 5, characterized in that: The curvature of the side where the movable locking block (300) connects with the lifting section is consistent with the curvature of the outer wall of the lifting section.

7. The disassembly device for the sleeve riser section according to claim 6, characterized in that: After the two arc-shaped clamps (100) are assembled, the inner wall of the arc-shaped clamp (100) and the inner wall of the movable clamp (300) are smoothly connected.

8. The disassembly device for the sleeve riser section according to claim 7, characterized in that: Each of the two arc-shaped clamps (100) is provided with a slot (500) for mounting the force-adding rod on the side opposite to the lifting section.

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