Hydraulic control type dynamic anchor for drill rod

Abstract

The utility model discloses a hydraulic control type dynamic anchor for a drill rod, which relates to the technical field of drilling equipment and comprises an anchor main body, a piston cavity is arranged on the upper portion inside the anchor main body, a piston disc is connected inside the piston cavity, a spring is connected to the bottom of the piston disc, and abutting blocks are connected to two sides of the bottom of the piston disc. Limiting grooves are formed in the two sides of the anchor body correspondingly, and anchoring blocks are connected into the limiting grooves. Through the arrangement of the piston disc, the abutting block, the spring, the anchoring block, the high-temperature-resistant magnet and the limiting groove, hydraulic oil enters the piston cavity and then pushes the piston disc, the piston disc and the abutting block are made to move towards the anchoring block, and then the slope at the bottom of the abutting block applies pressure to the slope on one side of the anchoring block; the anchoring block extends out of the limiting groove to be in contact with the inner wall of the sleeve to complete anchoring, the contact area between the anchoring block and the limiting groove is large, and the phenomenon that the anchoring block loosens and falls off due to the fact that the contact surface is broken can be effectively avoided. The structure is simple, use is convenient, and stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a hydraulically controlled drill pipe dynamic anchor. Background Art

[0002] The hydraulically controlled drill pipe dynamic anchor is used in conjunction with the hydraulic booster to achieve synchronous anchoring with the hydraulic booster's pressure increase, which can facilitate downhole tubing salvage operations, improve salvage efficiency and salvage results, and meet the production needs of offshore oil field exploitation.

[0003] The application number is 202120977780.0. A hydraulically controlled drill pipe dynamic anchor comprises an upper joint, a central shaft, an anchor tooth block, an anchor tooth seat, a tooth seat frame, a piston sleeve and a hydraulic cylinder sleeve. The central shaft is fixedly connected to the upper joint to form an anchor body. The hydraulic cylinder sleeve and the piston sleeve are sleeved on the anchor body to form a hydraulic cylinder structure. The tooth seat frame is fixed to the end of the piston sleeve and sleeved on the anchor body. An anchor tooth block is set on the side wall. The anchor adopts a hydraulic pressure of the hydraulic cylinder sleeve and the piston sleeve. The driving structure, when the liquid pressure is used to push the anchor seat upward, will make the anchor block radially expand and anchor on the wall of the oil well casing, providing a pulling support point for the hydraulic booster. When used in conjunction with the hydraulic booster, it can achieve synchronous anchoring with the hydraulic booster force pulling, and synchronously release the anchoring when the pressure is released and reset after the force boosting pulling stroke is completed. In the periodic change process of the hydraulic booster force pulling and the drill pipe lifting, synchronous cooperation is carried out for periodic dynamic anchoring, thereby improving the efficiency and effect of pipe column salvage.

[0004] This technical solution uses hydraulic pressure to drive the anchor seat upward and outward to anchor, but in the process of lifting, the anchor drives the sleeve upward through the friction between the anchor seat and the sleeve, and the anchor seat is subjected to a downward reaction force. It can be seen from the attached figure of this technical solution that the contact surface between the anchor seat and the seat frame is small, and the anchor seat is supported by an elastic sheet, while the weight of the metal sleeve is usually large. The anchor seat is subjected to a downward reaction force, which may cause the tip of the seat frame to crack, and then the structure becomes loose or even falls off. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a hydraulically controlled drill pipe dynamic anchor to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulically controlled drill pipe dynamic anchor, comprising an anchor body, a piston cavity is arranged on the upper part of the interior of the anchor body, and a piston disk is connected to the interior of the piston cavity, a spring is connected to the bottom of the piston disk, and both sides of the bottom of the piston disk are connected to resistance blocks, limiting grooves are arranged on both sides of the anchor body, and anchor blocks are connected to the interior of the limiting grooves, and a high-temperature resistant magnet is fixed to one side of the interior of the limiting groove.

[0007] By adopting the above technical solution, the hydraulic oil enters the piston cavity and pushes the piston disc, so that the piston disc and the stop block are displaced toward the anchor block. Then, the slope at the bottom of the top block applies pressure to the slope on one side of the anchor block, so that the anchor block extends from the limit groove and contacts the inner wall of the casing to complete the anchoring. The contact area between the anchor block and the limit groove is large, which can effectively avoid the phenomenon of the anchor block loosening and falling off due to the breakage of the contact surface. After the pressure is released, the spring drives the piston disc and the stop block away from the anchor block. At this time, the anchor block is sucked by the magnetic attraction force of the high-temperature resistant magnet, so that the anchor block is retracted into the limit groove.

[0008] Furthermore, the piston cavity and the piston disc are both in annular shape.

[0009] By adopting the above technical solution, the annular piston cavity facilitates the movement of the annular piston disc, and the annular piston disc facilitates the simultaneous movement of multiple top blocks distributed in an annular array.

[0010] Furthermore, the cross-sections of the anchor block and the limiting groove are both T-shaped, and the anchor block is slidably connected to the limiting groove.

[0011] By adopting the above technical solution, the anchor block extends out from the limiting groove and contacts the inner wall of the casing to complete the anchoring. At the same time, since the cross-sections of the anchor block and the limiting groove are both T-shaped, the anchor block is prevented from falling off from the limiting block.

[0012] Furthermore, the bottom of the stop block is sloped, and both the top side and the bottom side of the anchor block are sloped.

[0013] By adopting the above technical solution, the slope on the top block applies pressure to the slope on one side of the plurality of anchor blocks, so that the anchor blocks extend from the limiting grooves and contact the inner wall of the casing to complete the anchoring.

[0014] Furthermore, the abutment blocks, anchoring blocks, high temperature resistant magnets and limiting grooves are provided in plurality, and the plurality of abutment blocks, anchoring blocks, high temperature resistant magnets and limiting grooves are distributed in a ring array.

[0015] By adopting the above technical solution, the anchoring block extends from the limiting groove and contacts the inner wall of the casing to complete the anchoring, and the friction between the anchor and the casing is increased by increasing the number of the anchoring blocks.

[0016] Furthermore, a flow hole is provided at the top of the anchor body, and a side flow hole is provided between the flow hole and the piston cavity.

[0017] By adopting the above technical solution, the hydraulic oil enters the two piston chambers through the flow hole and the side flow hole, so that the anchor block extends out to anchor the casing.

[0018] Furthermore, there are two piston chambers, two piston discs and two springs, and the two piston chambers, two piston discs and two springs are symmetrically distributed.

[0019] By adopting the above technical solution, an additional piston chamber, a piston disc and a spring are additionally provided to drive the two groups of resistance blocks to move, thereby applying pressure to the top side and the bottom side of the anchor block at the same time.

[0020] Furthermore, the plurality of said blocks are divided into two groups, and the two groups of blocks are mirror-imaged.

[0021] By adopting the above technical solution, pressure is applied to the top side and the bottom side of the anchor block at the same time, so that the anchor block is evenly stressed and can be pushed out smoothly to reduce resistance.

[0022] In summary, the utility model mainly has the following beneficial effects:

[0023] The utility model adopts the arrangement of a piston disc, a resisting block, a spring, an anchoring block, a high-temperature resistant magnet and a limiting groove. After the hydraulic oil enters the piston cavity, it pushes the piston disc, so that the piston disc and the resisting block are both displaced toward the anchoring block. Then, the slope at the bottom of the top block applies pressure to the slope on one side of the anchoring block, so that the anchoring block extends out of the limiting groove and contacts the inner wall of the casing to complete the anchoring. The contact area between the anchoring block and the limiting groove is large, which can effectively avoid the phenomenon that the anchoring block loosens and falls off due to the breakage of the contact surface. After the pressure is released, the spring drives the piston disc and the resisting block to move away from the anchoring block. At this time, the anchoring block is sucked by the magnetic attraction force of the high-temperature resistant magnet, so that the anchoring block is retracted into the limiting groove. The structure is simple, easy to use, and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the anchor block of the utility model after it is extended;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0027] Figure 4 It is a schematic diagram of the explosion structure of the utility model.

[0028] In the figure: 1. Anchor body; 2. Flow hole; 3. Side flow hole; 4. Piston chamber; 5. Piston disc; 6. Stop block; 7. Spring; 8. Anchor block; 9. High temperature resistant magnet; 10. Limiting groove. DETAILED DESCRIPTION

[0029] 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. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0030] The following describes an embodiment of the utility model based on its overall structure.

[0031] Embodiment 1:

[0032] A hydraulically controlled drill pipe dynamic anchor, such as Figure 1-Figure 4 As shown, it includes an anchor body 1, a piston cavity 4 is arranged on the upper part of the interior of the anchor body 1, a piston disc 5 is connected to the interior of the piston cavity 4, the piston cavity 4 and the piston disc 5 are both in annular shape, and both sides of the bottom of the piston disc 5 are connected to the push blocks 6, and the bottom of the push blocks 6 is sloped. After the hydraulic oil enters the piston cavity 4, it pushes the two piston discs 5, so that the two piston discs 5 and the two groups of push blocks 6 are displaced toward the direction of multiple anchor blocks 8; a spring 7 is connected to the bottom of the piston disc 5, and after the pressure is released, the spring 7 drives the piston disc 5 and the push blocks 6 away from the anchor blocks 8; limiting grooves 10 are provided on both sides of the anchor body 1, and the limiting grooves 10 are connected to the anchor blocks 8, the top side and the bottom side of the anchor block 8 are sloped, and the anchor block 8 and the limiting grooves The cross-sections of 10 are both in the shape of a "T". Since the cross-sections of the anchor block 8 and the limiting groove 10 are both in the shape of a T, the anchor block 8 is prevented from falling off from the limiting block; the anchor block 8 is slidably connected to the limiting groove 10, and the anchor block 8 is sucked by the magnetic attraction of the high-temperature resistant magnet 9, so that the anchor block 8 is retracted into the limiting groove 10; a high-temperature resistant magnet 9 is fixed to one side of the inner side of the limiting groove 10, and a plurality of the stop blocks 6, anchor blocks 8, high-temperature resistant magnets 9 and limiting grooves 10 are provided, and the plurality of stop blocks 6, anchor blocks 8, high-temperature resistant magnets 9 and limiting grooves 10 are distributed in a ring array, and the anchor block 8 extends out from the limiting groove 10 to contact the inner wall of the casing to complete the anchoring, and the friction between the anchor and the casing is increased by increasing the number of anchor blocks 8.

[0033] See also Figure 1-Figure 4 In the above embodiment, a flow hole 2 is opened on the top of the anchor body 1, and a side flow hole 3 is provided between the flow hole 2 and the piston cavity 4, and the hydraulic oil enters the two piston cavities 4 through the flow hole 2 and the side flow hole 3.

[0034] Embodiment 2:

[0035] On the basis of the above-mentioned first embodiment, in order to make the anchor block 8 bear force evenly and reduce resistance so that the anchor block 8 can be pushed out smoothly, the following settings are adopted.

[0036] See also Figure 2-Figure 4In the above embodiment, two piston chambers 4, two piston discs 5 and two springs 7 are provided, and the two piston chambers 4, the piston discs 5 and the springs 7 are symmetrically distributed. The multiple blocks 6 are divided into two groups, and the two groups of blocks 6 are mirror-imaged. By applying pressure to the top and bottom sides of the anchor block 8 at the same time, the anchor block 8 is evenly stressed and can be pushed out smoothly to reduce resistance.

[0037] The implementation principle of the utility model is as follows: first, the hydraulic oil enters the two piston chambers 4 through the flow hole 2 and the side flow hole 3. After the hydraulic oil enters the piston chamber 4, it pushes the two piston discs 5, so that the two piston discs 5 and the two groups of resist blocks 6 are displaced toward the multiple anchor blocks 8. Then, the slopes on the two groups of top blocks apply pressure to the slopes on one side of the multiple anchor blocks 8, so that the anchor blocks 8 extend out from the limiting grooves 10 and contact with the inner wall of the casing to complete the anchoring. At the same time, since the cross-sections of the anchor blocks 8 and the limiting grooves 10 are both T-shaped, the anchor blocks 8 are prevented from falling off from the limiting blocks. After the pressure is released, the spring 7 drives the piston disc 5 and the resist blocks 6 away from the anchor blocks 8. At this time, the anchor blocks 8 are sucked by the magnetic attraction force of the high-temperature resistant magnets 9, so that the anchor blocks 8 are retracted into the limiting grooves 10.

[0038] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A hydraulically controlled drill pipe dynamic anchor, comprising an anchor body (1), characterized in that: A piston cavity (4) is arranged at the upper part of the anchor body (1), and a piston disc (5) is connected to the inside of the piston cavity (4), a spring (7) is connected to the bottom of the piston disc (5), and both sides of the bottom of the piston disc (5) are connected to abutment blocks (6), and both sides of the anchor body (1) are provided with limiting grooves (10), and an anchor block (8) is connected to the inside of the limiting groove (10), and a high-temperature resistant magnet (9) is fixed to one side of the limiting groove (10).

2. The hydraulically controlled drill pipe dynamic anchor according to claim 1 is characterized in that: The piston chamber (4) and the piston disc (5) are both in annular shape.

3. The hydraulically controlled drill pipe dynamic anchor according to claim 1 is characterized in that: The cross sections of the anchor block (8) and the limiting groove (10) are both T-shaped, and the anchor block (8) is slidably connected to the limiting groove (10).

4. The hydraulically controlled drill pipe dynamic anchor according to claim 3 is characterized in that: The bottom of the stop block (6) is sloped, and the top side and the bottom side of the anchor block (8) are both sloped.

5. The hydraulically controlled drill pipe dynamic anchor according to claim 4 is characterized in that: The abutment block (6), anchor block (8), high temperature resistant magnet (9) and limiting groove (10) are provided in plurality, and the plurality of abutment blocks (6), anchor block (8), high temperature resistant magnet (9) and limiting groove (10) are distributed in a ring array.

6. The hydraulically controlled drill pipe dynamic anchor according to claim 1, characterized in that: A flow hole (2) is provided on the top of the anchor body (1), and a side flow hole (3) is provided between the flow hole (2) and the piston chamber (4).

7. The hydraulically controlled drill pipe dynamic anchor according to claim 2 is characterized in that: The piston chamber (4), the piston disc (5) and the spring (7) are each provided with two, and the two piston chambers (4), the piston disc (5) and the spring (7) are symmetrically distributed.

8. The hydraulically controlled drill pipe dynamic anchor according to claim 5, characterized in that: The plurality of abutment blocks (6) are divided into two groups, and the two groups of abutment blocks (6) are arranged in a mirror image.

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