High-temperature-resistant cylindrical strong magnetic fisher for overhaul of casing damage well

Abstract

The utility model relates to the technical field of cylindrical fishers, in particular to a high-temperature-resistant cylindrical strong magnetic fisher for casing damage well overhaul, which comprises a fishing body, a lower joint and a plurality of strong magnetic blocks, the lower joint integrated with the fishing body is arranged at the left end of the fishing body, the fishing body is of a hollow cylindrical structure, and the strong magnetic blocks are circumferentially arranged on the outer wall of the fishing body. The two ends of the strong magnetic block are clamped and positioned by a check block A and a check block B which are symmetrically arranged and fixed through a plurality of screws, spring pads are arranged between the screws and the check block A, the spring pads are arranged on the outer walls of the screws in a sleeving mode, and four rectangular reinforcing ribs are arranged on the outer wall of the fishing body, so that the overall strength and rigidity are improved, and the non-deformability is enhanced; t-shaped grooves are formed in the two sides of the rectangular reinforcing rib and used for embedding strong magnetic blocks to guarantee the working efficiency, a through hole is formed in the center of the fishing body and serves as a circulating liquid channel to help cool the fisher and carry chippings to prolong the service life, and the fisher can improve the efficiency and safety of casing damage well overhaul operation.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical fishing tools, in particular to a high-temperature resistant cylindrical strong magnetic fishing tool for major repairs of damaged casing wells. Background Technique

[0002] In the development process of oil and gas fields, due to the complexity of geological conditions, the limitations of drilling technology, and other unforeseen factors, the casing may be damaged such as deformed or cracked, which directly affects the normal production and safe operation of oil wells. The repair of damaged casing wells, especially in high-temperature well sections, has always been a technical problem in the industry. During the process of drilling and workover wells, sometimes there are some small magnetizable debris and non-magnetizable small metal pieces deposited in the well, and they cannot be carried out to the ground through the circulating fluid. When these things accumulate at the bottom of the well, they will inevitably seriously affect the drilling efficiency and safety of the drill bit.

[0003] At present, there are a wide variety of fishing tools on the market, including slip fishing bowls, magnetic fishing tools, etc. However, these tools generally have problems such as poor temperature resistance, low fishing efficiency, and narrow application range. Especially in high-temperature environments, the material properties of traditional fishing tools will significantly decline, and they cannot effectively complete the fishing task. This not only prolongs the workover operation time, increases the operation cost, but also may lead to downhole accidents, affecting the production progress and economic benefits of the entire oilfield. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The utility model provides a high-temperature resistant cylindrical strong magnetic fishing tool for major repairs of damaged casing wells to overcome the problems in the prior art that the fishing coverage area of the strong magnetic fishing tool is small and it cannot adapt to high-temperature and high-pressure working environments.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the utility model provides a high-temperature resistant cylindrical strong magnetic fishing tool for major repairs of damaged casing wells, including: a fishing body, a lower sub, and a plurality of strong magnetic blocks;

[0008] The lower sub is provided at the left end of the fishing body, and the lower sub is integrally formed with the fishing body;

[0009] The fishing body is a hollow cylindrical structure, and a plurality of strong magnetic blocks are circumferentially arranged on the outer wall of the fishing body;

[0010] Both ends of the plurality of strong magnetic blocks are clamped and positioned by a stop block A and a stop block B respectively. The stop block A and the stop block B are symmetrically arranged, and the stop block A and the stop block B are fixed by a plurality of screws;

[0011] Spring washers are respectively arranged between the screw and the stopper A, and the spring washers are sleeved on the outer wall of the screw.

[0012] Preferably, four rectangular reinforcing ribs are evenly arranged on the outer wall of the fishing body, and T-shaped grooves are arranged on both sides of each rectangular reinforcing rib.

[0013] Preferably, the several strong magnetic blocks are respectively embedded in the T-shaped grooves arranged on both sides of the rectangular belt.

[0014] Preferably, the stopper A is of a rectangular structure, and several through holes are evenly arranged on the outer wall of the stopper A.

[0015] Preferably, a through hole is arranged at the center of the fishing body, and the through hole is a circulating liquid channel.

[0016] Preferably, the stopper B is of a rectangular structure, the stopper B has the same size as the stopper A, and through holes matching the stopper A are arranged on the outer wall of the stopper B.

[0017] Preferably, the strong magnetic block is a samarium-cobalt strong magnetic block, and the samarium-cobalt strong magnetic block can maintain magnetism at 200 - 300 degrees Celsius.

[0018] Preferably, the right end of the fishing body is of a conical structure, and an annular step with an outer edge is arranged at the left end of the conical structure.

[0019] (III) Beneficial effects

[0020] The utility model provides a high-temperature resistant cylindrical strong magnetic fishing tool for major repair of casing damage wells, which can improve the overall strength and rigidity of the fishing tool by arranging four rectangular reinforcing ribs on the outer wall of the fishing body, enhance its anti-deformation ability under complex well conditions, and T-shaped grooves are arranged on both sides of the rectangular reinforcing ribs for embedding strong magnetic blocks, so that the strong magnetic blocks are tightly combined with the fishing body, ensuring the working efficiency of the fishing tool. The strong magnetic blocks are clamped and positioned by the stopper A and the stopper B and fixed with screws, increasing the structural stability and preventing the strong magnetic blocks from shifting or falling off during the working process. A through hole is arranged at the center of the fishing body, and the through hole serves as a circulating liquid channel for circulating flushing, helping to cool the fishing tool and carry debris, which is beneficial to extending the service life of the fishing tool, thereby achieving the purpose of improving the efficiency and safety of major repair operations for casing damage wells. Description of the drawings

[0021] Figure 1 Shows a schematic structural diagram of a high-temperature resistant cylindrical strong magnetic fishing tool for major repair of casing damage wells of the utility model;

[0022] Figure 2 Shows Figure 1 The sectional view along A-A in;

[0023] Figure 3 Shows Figure 1Schematic diagram of the sectional structure along B-B

[0024] Wherein: 1: Fishing body; 2: Lower joint; 3: Strong magnetic block; 4: Stop block A; 5: Stop block B; 6: Screw; 7: Spring washer; 8: Circulating fluid channel. Specific implementation mode

[0025] The present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] In the description of the present utility model, it is necessary to understand that the orientation or positional relationship indicated by "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of the present utility model and simplify the description, and does not indicate or imply that the components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] As Figures 1-3 shown, the present utility model provides a high-temperature resistant cylindrical strong magnetic fishing tool for major repairs of casing damage wells, including: a fishing body 1, a lower joint 2, and a plurality of strong magnetic blocks 3;

[0028] The left end of the fishing body 1 is provided with a lower joint 2, and the lower joint 2 and the fishing body 1 are integrally designed, ensuring the firmness and reliability of the entire fishing tool, and avoiding breakage or loosening in the downhole environment with high pressure and high load. The fishing body 1 adopts a hollow cylindrical structure. The design of the hollow cylindrical structure not only effectively reduces the weight of the fishing body 1, facilitating operation and transportation, but also maintains sufficient structural strength and stability to cope with the complex downhole environment;

[0029] The right end of the fishing body 1 is a conical structure. The left end of the conical structure is provided with an annular step on the outer edge. The conical structure helps to play a role in breaking through resistance during the process of lowering the fishing tool into the well. During the process of lowering the fishing tool into the well, the conical structure can first contact the obstacles in the well, and through its conical shape and strong impact force, it can easily break through the blockage and create favorable conditions for subsequent fishing operations;

[0030] A plurality of strong magnetic blocks 3 are evenly distributed on the outer wall of the fishing body 1 in the circumferential direction. These strong magnetic blocks 3 can provide a strong magnetic field to effectively capture and fish various metal fragments or tools in the well. The even distribution in the circumferential direction ensures the balance and wide range of the magnetic field, improving the efficiency and success rate of fishing;

[0031] To ensure the firm installation of the strong magnetic block 3, stoppers A 4 and stoppers B 5 are symmetrically arranged at both ends of each strong magnetic block 3 for clamping and positioning. The stoppers A 4 and stoppers B 5 are fixed by multiple screws 6, ensuring that the strong magnetic block 3 will not displace or fall off in a high-intensity working environment. A spring washer 7 is provided between the screw 6 and the stopper A 4. The spring washer 7 plays a key role in preventing loosening and damping. The spring washer 7 is sleeved on the outer wall of the screw 6. Through its elastic characteristics, it effectively alleviates the vibration and impact suffered by the screw 6 during the fishing process, preventing the screw 6 from loosening, thereby further improving the stability and reliability of the entire structure;

[0032] Four rectangular reinforcing ribs are evenly arranged on the outer wall of the fishing body 1. T-shaped grooves are provided on both sides of each rectangular reinforcing rib. The four rectangular reinforcing ribs not only enhance the rigidity of the fishing body 1, but also provide a stable installation position for the strong magnetic block 3 through the T-shaped grooves on both sides. This setting enables the strong magnetic block 3 to remain stable during operation, avoiding displacement or falling off due to vibration or impact, thus ensuring the efficient operation of the fishing tool;

[0033] Multiple strong magnetic blocks 3 are respectively embedded in these T-shaped grooves. Since each strong magnetic block 3 is embedded in the T-shaped groove and clamped and positioned by the stoppers A 4 and stoppers B 5, this double guarantee measure further enhances the connection strength between the strong magnetic block 3 and the fishing body 1. Due to the presence of the four rectangular reinforcing ribs, the working surface of the strong magnetic block 3 increases to eight, which significantly expands the area of adsorption and fishing, improving the fishing efficiency. This design makes the adsorption surface free of dead corners, meaning that the fishing tool can contact and adsorb metal fragments or tools in the wellbore more comprehensively, reducing the possibility of missed adsorption. This all-round adsorption ability is of great significance for improving the fishing success rate and reducing the fishing time;

[0034] Both the stopper A 4 and the stopper B 5 are of rectangular structure. Multiple through holes are provided on the outer wall of the stopper A 4. The stopper B 5 has the same size as the stopper A 4, and through holes matching those of the stopper A 4 are provided on the outer wall of the stopper B 5. Such a design enables the stopper A 4 and the stopper B 5 to be fixed by screws 6, with simple operation and easy maintenance.

[0035] A through hole is provided at the center of the fishing body 1. This through hole serves as the circulating fluid channel 8. The design of the circulating fluid channel 8 allows the circulating fluid to pass through, which helps to cool the fishing tool and carry debris, thereby improving the fishing efficiency and safety;

[0036] The strong magnetic block 3 is made of samarium-cobalt strong magnetic material, which can maintain its magnetism in a high-temperature environment of 200 - 300 degrees Celsius, ensuring the normal operation of the fishing tool in a high-temperature wellbore.

[0037] The actual working scenario of a high-temperature-resistant cylindrical strong magnetic fishing tool for major repair of casing damage wells is introduced in detail below.

[0038] During the actual operation process, the high-temperature resistant cylindrical strong magnetic fishing tool for major repair of casing damage wells is connected to the drill pipe through the lower joint 2 and lowered to the designated position in the well. During this process, it is necessary to ensure the stability and safety of the fishing tool. During the lowering process, the circulating fluid flows through the circulating fluid channel 8 to help cool the fishing tool and carry debris. When the fishing tool reaches the designated position, the strong magnetic block 3 starts to function, adsorbing the surrounding metal fragments or tools. The strong magnetic blocks 3 provided on the eight working surfaces of the fishing tool can provide omnidirectional adsorption ability, ensuring that the fishing tool can fully contact and adsorb the metal fragments or tools in the well. After the adsorption is completed, the fishing tool is lifted out of the well through the drill pipe. During the lifting process, the circulating fluid continues to flow to help carry debris and cool the fishing tool. After being lifted out of the well, check the metal fragments or tools adsorbed by the fishing tool and evaluate the fishing effect. Repeat the above process until the remaining metal fragments or tools in the well are completely fished out.

[0039] It can be understood that for the above-mentioned various embodiments mentioned in the present utility model, without violating the principle logic, they can be combined with each other to form a combined embodiment. Due to space limitations, the present utility model will not elaborate further.

[0040] Those skilled in the art can understand that in the above method of the specific implementation manner, the writing order of each step does not mean a strict execution order that constitutes any limitation to the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0041] A high-temperature resistant cylindrical strong magnetic fishing tool for major repair of casing damage wells provided by the present utility model has four rectangular reinforcing ribs provided on the outer wall of the fishing body 1, which improves the overall strength and rigidity of the fishing tool and enhances its anti-deformation ability under complex well conditions. T-shaped grooves are provided on both sides of the rectangular reinforcing ribs for embedding the strong magnetic blocks 3, so that the strong magnetic blocks 3 are tightly combined with the fishing body 1, ensuring the working efficiency of the fishing tool. The strong magnetic blocks 3 are clamped and positioned by the stop block A 4 and the stop block B 5 and fixed with screws 6, increasing the structural stability and preventing the strong magnetic blocks 3 from shifting or falling off during the working process. A through hole is provided in the center of the fishing body 1, and this through hole serves as the circulating fluid channel 8, which can be used for circulating flushing to help cool the fishing tool and carry debris, which is beneficial to extending the service life of the fishing tool, thereby achieving the purpose of improving the efficiency and safety of the major repair operation of casing damage wells.

[0042] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. A high temperature resistant cylindrical strong magnetic fishing device for overhaul of casing damaged wells, characterized in that: include: A salvaging body (1), a lower joint (2) and a plurality of strong magnetic blocks (3); A lower joint (2) is provided at the left end of the salvage body (1), and the lower joint (2) and the salvage body (1) are made as one piece; The salvage body (1) is a hollow cylindrical structure, and a plurality of strong magnetic blocks (3) are arranged in the circumferential direction of the outer wall of the salvage body (1); The two ends of the plurality of strong magnetic blocks (3) are clamped and positioned by a block A (4) and a block B (5), respectively. The block A (4) and the block B (5) are symmetrically arranged, and the block A (4) and the block B (5) are fixed by a plurality of screws (6); A spring washer (7) is provided between the screw (6) and the stopper A (4), and the spring washer (7) is sleeved on the outer wall of the screw (6).

2. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 1 is characterized in that: The outer wall of the salvage body (1) is evenly provided with four rectangular reinforcement ribs, and both sides of each rectangular reinforcement rib are provided with T-shaped grooves.

3. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 2 is characterized in that: The plurality of strong magnetic blocks (3) are respectively embedded in T-shaped slots provided on both sides of the rectangular belt.

4. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 1 is characterized in that: The stopper A (4) is a rectangular structure, and a plurality of through holes are evenly arranged on the outer wall of the stopper A (4).

5. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 1 is characterized in that: A through hole is provided at the centre of the salvaging body (1), and the through hole is a circulating fluid channel (8).

6. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 4 is characterized in that: The stopper B (5) is a rectangular structure. The stopper B (5) has the same size as the stopper A (4). The outer wall of the stopper B (5) is provided with a through hole matching the stopper A (4).

7. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 3 is characterized in that: The strong magnetic block (3) is a samarium cobalt strong magnetic block, which can maintain magnetism at 200-300 degrees Celsius.

8. The high temperature resistant cylindrical strong magnetic fishing device for casing damage well overhaul according to claim 1 is characterized in that: The right end of the salvaging body (1) is a conical structure, and the left end of the conical structure is provided with an annular step on the outer edge.

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