Cathodic protection device for adapting tubing of various types of oil wells

Abstract

The utility model relates to oil pipe cathode protection technical field discloses the oil pipe cathode protection device of adaptation multitype oil well, including oil pipe body and electric box, the outer wall of oil pipe body is provided with cathode protection mechanism, cathode protection mechanism is used for protecting oil pipe cathode, the front side of electric box is provided with circuit quick -joint mechanism, the circuit quick -joint mechanism is used for quick dismounting protection device, the right side of oil pipe body is provided with centralizer mechanism, the adjacent side of two anode fixed sleeve all slide connection in the outer wall front and back side of oil pipe body. In the utility model, through anode fixed sleeve along the outer wall of oil pipe body sliding adjustment position, cathode connecting sleeve is fixed in oil pipe body, anode connecting wire is butt jointed with anode fixed sleeve through anode circuit connection subassembly, when the sacrifice anode is consumed, need not complex operation to quick split anode fixed sleeve.

Description

Technical Field

[0001] This utility model relates to the field of tubing cathodic protection technology, and in particular to a tubing cathodic protection device adapted to various types of oil wells. Background Technology

[0002] The cathodic protection device for oil well tubing is an anti-corrosion system designed using cathodic protection technology to address the electrochemical corrosion problem of tubing in the complex downhole environment. Its core function is to extend the service life of the tubing by inhibiting the oxidation reaction. It is equipped with a reference electrode and a current controller assembly to monitor and adjust the protection parameters in real time, ensuring stable operation under the high temperature and high pressure conditions of oil wells. It is a key piece of equipment for the corrosion protection of oil well tubing.

[0003] The cathodic protection device for oil well tubing can accurately resist the electrochemical corrosion of tubing by downhole brine and hydrogen sulfide. It can adapt to various scenarios by using either sacrificial anode or applied current. When paired with a reference electrode, it can monitor and dynamically adjust protection parameters in real time. This not only significantly extends the service life of the tubing and reduces the frequency of replacement to lower maintenance costs, but also provides continuous and stable corrosion protection in complex downhole environments, effectively ensuring safe production of oil wells.

[0004] However, the anode will gradually be consumed during long-term protection, and a loose corrosion product layer will form on the surface. Furthermore, the high temperature and high pressure environment downhole may cause the corrosion products to adhere to the inner wall of the tubing and casing, and even cause local scaling due to electrochemical action. During subsequent maintenance or replacement, a lot of manpower and resources are required to clean the corrosion residue and break the adhered parts. It may also cause accidental damage to the tubing body during disassembly, affecting the overall safety and subsequent performance of the well string. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a tubing cathodic protection device that is compatible with various types of oil wells. It aims to improve the problem in the prior art that the anode will gradually be consumed during long-term protection, and a loose corrosion product layer will form on the surface. In subsequent maintenance or replacement, a lot of manpower and resources are required to clean the corrosion residue and break the bonded parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a tubing cathodic protection device adapted to multiple types of oil wells, including a tubing body and an electrical box, wherein a cathodic protection mechanism is provided on the outer wall of the tubing body, the cathodic protection mechanism is used to protect the tubing cathode, a circuit quick-connect mechanism is provided on the front side of the electrical box, the circuit quick-connect mechanism is used to quickly disassemble the protection device, and a centralizer mechanism is provided on the right side of the tubing body. The cathodic protection mechanism includes two anode fixing sleeves, with each adjacent side of the two anode fixing sleeves slidably connected to the front and rear sides of the outer wall of the oil pipe body. A cathode connecting sleeve is fixedly connected to the outer wall of the oil pipe body. Two anode connecting lines are provided at the front left end of the electrical box. A cathode connecting line is fixedly connected to the top of the cathode connecting sleeve. A bottom rod is fixedly connected to the bottom end of the electrical box. Two fixing sleeve connecting assemblies are provided between the adjacent two anode fixing sleeves. An anode circuit connecting assembly is provided at the bottom of the anode connecting line.

[0007] As a further description of the above technical solution: The circuit quick-connect mechanism includes multiple main rods, the rear sides of which are fixedly connected to the left and right ends of the front side of the electrical box. Two compression rods penetrate the outer wall of each main rod, and a wedge-shaped locking block is fixedly connected to the bottom of each compression rod. A spring is fixedly connected to the top of each wedge-shaped locking block. Locking components are provided on the rear sides of both the anode connection wire and the cathode connection wire.

[0008] As a further description of the above technical solution: Sacrificial anodes are fixedly connected to the opposite sides of the two anode fixing sleeves. Both sacrificial anodes are made of materials with low electrode potential, and the outer walls of both sacrificial anodes are in contact with the ground.

[0009] As a further description of the above technical solution: The fixing sleeve connection assembly includes multiple connecting plates, with adjacent sides of the multiple connecting plates respectively fixedly connected to the outer walls of two anode fixing sleeves, and multiple fixing screws fixedly connected inside the multiple connecting plates.

[0010] As a further description of the above technical solution: The anode circuit connection assembly includes multiple conductive plates, with adjacent sides of the multiple conductive plates fixedly connected to the left and right sides of the two anode connection lines, and screws passing through the right sides of the multiple conductive plates, with nuts threaded to the left sides of the two screws.

[0011] As a further description of the above technical solution: The locking assembly includes a support rod, the front side of which is fixedly connected to the rear end of the anode connection line and the cathode connection line, a locking block is fixedly connected to the left end of the support rod, and a movable block is slidably connected to the outer wall of the support rod.

[0012] As a further description of the above technical solution: The centralizer mechanism includes two centralizer fixing rings. The inner walls of the two centralizer fixing rings are located on the right side of the outer wall of the tubing body. Multiple elastic arms are fixedly connected to the outer walls of the two centralizer fixing rings, and wear-resistant blocks are fixedly connected to the outer walls of the multiple elastic arms.

[0013] As a further description of the above technical solution: Both of the centralizer fixing rings are fixedly connected to the same metal frame, which is made of alloy steel and has multiple weight-reduction holes on its outer wall.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the position of the anode fixing sleeve is adjusted by sliding along the outer wall of the tubing body and reinforced by the fixing sleeve connecting assembly. The cathode connecting sleeve is fixed to the tubing body. The anode connecting line is connected to the anode fixing sleeve through the anode circuit connecting assembly. The cathode connecting line connects the cathode connecting sleeve and the electrical box. When the sacrificial anode is consumed, the anode fixing sleeve can be quickly disassembled without complicated operations, simplifying the disassembly process, reducing the operation time during device maintenance or replacement, and adapting to the different maintenance needs of various types of oil wells.

[0015] 2. In this utility model, the main body rod is fixed to the front side of the electrical box, and the wedge-shaped locking block at the bottom is connected to the top spring. When the locking components on the rear side of the anode connection wire and the cathode connection wire align with the main body rod, the wedge-shaped locking block is engaged with the locking components under the action of the spring to complete the fixation. When disassembling, pressing the compression rod will cause the wedge-shaped locking block to disengage from the locking components, thereby realizing the rapid separation of the line from the electrical box, greatly shortening the circuit disassembly and assembly time, reducing the difficulty of on-site operation, and ensuring the work efficiency when the device is repaired or replaced. Attached Figure Description

[0016] Figure 1 This is a perspective view of the tubing cathodic protection device adapted to various types of oil wells proposed in this utility model; Figure 2 This is a front view of the tubing cathodic protection device adapted to multiple types of oil wells proposed in this utility model; Figure 3 This is an exploded view of the anode circuit connection assembly in the tubing cathodic protection device adapted to multiple types of oil wells proposed in this utility model. Figure 4 This is a cross-sectional view of the quick-connect circuit mechanism in the tubing cathodic protection device adapted to various types of oil wells proposed in this utility model. Figure 5 This is a schematic diagram of the centralizer mechanism in the tubing cathodic protection device adapted to various types of oil wells proposed in this utility model.

[0017] Legend: 1. Oil pipe body; 2. Electrical box; 3. Cathodic protection mechanism; 31. Anode fixing sleeve; 32. Cathode connecting sleeve; 33. Anode connecting wire; 34. Cathode connecting wire; 35. Base rod; 36. Sacrificial anode; 37. Fixing sleeve connecting assembly; 371. Connecting plate; 372. Fixing screw; 38. Anode circuit connecting assembly; 381. Conductive plate; 382. Screw; 383. Nut; 4. Circuit quick-connect mechanism; 41. Main rod; 42. Compression rod; 43. Wedge locking block; 44. Spring; 45. Locking assembly; 451. Support rod; 452. Locking block; 453. Movable block; 5. Centralizer mechanism; 51. Centralizer fixing ring; 52. Elastic arm; 53. Wear-resistant block; 54. Metal frame. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0019] Reference Figures 1-2 An embodiment of this utility model is provided: a tubing cathodic protection device adapted to multiple types of oil wells, including a tubing body 1 and an electrical box 2. The outer wall of the tubing body 1 is provided with a cathodic protection mechanism 3, which is used to protect the tubing cathode. The front side of the electrical box 2 is provided with a circuit quick-connect mechanism 4, which is used to quickly disassemble the protection device. The right side of the tubing body 1 is provided with a centralizer mechanism 5. The cathodic protection mechanism 3 includes two anode fixing sleeves 31. The adjacent sides of the two anode fixing sleeves 31 are slidably connected to the front and rear sides of the outer wall of the oil pipe body 1. The outer wall of the oil pipe body 1 is fixedly connected to a cathode connecting sleeve 32. Two anode connecting lines 33 are provided at the front left end of the electrical box 2. A cathode connecting line 34 is fixedly connected to the top of the cathode connecting sleeve 32. A bottom rod 35 is fixedly connected to the bottom of the electrical box 2. Two fixing sleeve connecting assemblies 37 are provided between the adjacent two anode fixing sleeves 31. An anode circuit connecting assembly 38 is provided at the bottom of the anode connecting line 33. Specifically, the anode component is assembled with the oil pipe body 1 through two anode fixing sleeves 31 in the cathodic protection mechanism 3. The adjacent sides of the two anode fixing sleeves 31 are slidably connected to the front and rear sides of the outer wall of the oil pipe body 1, respectively. The sliding of the anode fixing sleeves 31 against the outer wall of the oil pipe body 1 determines the position of the anode fixing sleeves 31 on the oil pipe body 1, thus laying the foundation for the subsequent circuit connection between the anode and cathode. A cathode connecting sleeve 32 is fixedly connected to the outer wall of the oil pipe body 1, maintaining a fixed connection between the cathode connecting sleeve 32 and the oil pipe body 1 to ensure that the cathode connecting sleeve 32 can stably acquire the cathode signal from the oil pipe body 1. An anode connecting line 33 is provided at the front left end of the electrical box 2, with one end of the anode connecting line 33 connected to the electrical box 2. One end can establish a circuit connection with the anode fixing sleeve 31 through the anode circuit connection component 38. Current transmission between the electrical box 2 and the anode fixing sleeve 31 is realized through the anode connection line 33 and the anode circuit connection component 38. The top of the cathode connection sleeve 32 is fixedly connected to the cathode connection line 34. One end of the cathode connection line 34 is connected to the cathode connection sleeve 32, and the other end is connected to the electrical box 2. The cathode signal obtained by the cathode connection sleeve 32 is transmitted to the electrical box 2 through the cathode connection line 34. After receiving the anode current signal transmitted by the anode connection line 33 and the cathode signal transmitted by the cathode connection line 34, the electrical box 2 processes the signal and regulates the current output to keep the oil pipe body 1 in a suitable cathodic protection state and avoid damage to the oil pipe body 1 due to corrosion. A base rod 35 is fixedly connected to the bottom of the electrical box 2. The base rod 35 supports the electrical box 2. Through the contact between the base rod 35 and the mounting surface, the electrical box 2 is stably supported in the designated position, ensuring that the electrical box 2 remains stable during operation and does not shift, affecting the circuit connection and signal processing. Two fixing sleeve connecting assemblies 37 are provided between the two adjacent anode fixing sleeves 31. The two fixing sleeve connecting assemblies 37 connect the two anode fixing sleeves 31 into a whole, enhancing the fixing stability of the anode fixing sleeves 31 on the outer wall of the tubing body 1, preventing the anode fixing sleeves 31 from loosening during oil well operation, ensuring the relative position stability between the anode and the tubing body 1, and ensuring that the cathodic protection current can continuously and stably act on the tubing body 1. A quick-connect circuit mechanism 4 is provided on the front side of the electrical box 2. When the protection device needs to be disassembled, the circuit connection between the electrical box 2 and the anode connection line 33 and the cathode connection line 34 can be quickly disconnected by operating the quick-connect circuit mechanism 4. There is no need for cumbersome wire disconnection operations. The quick-connect circuit mechanism 4 simplifies the disassembly process and realizes the rapid disassembly of the protection device, thereby improving the efficiency of oil well maintenance operations. A centralizer mechanism 5 is provided on the right side of the tubing body 1. During the process of the tubing body 1 being lowered into the oil well, the centralizer mechanism 5 contacts the well wall. Through the interaction between the centralizer mechanism 5 and the well wall, the lowering direction of the tubing body 1 is corrected, preventing the tubing body 1 from deviating and colliding with the well wall during the descent. This ensures that the tubing body 1 can be smoothly lowered into the designated position, while avoiding damage caused by friction between the tubing body 1 and the well wall.

[0020] Reference Figure 4 The circuit quick-connect mechanism 4 includes multiple main rods 41. The rear sides of the multiple main rods 41 are respectively fixedly connected to the left and right ends of the front side of the electrical box 2. Two compression rods 42 penetrate through the outer wall of the main rods 41. A wedge-shaped locking block 43 is fixedly connected to the bottom of each compression rod 42. A spring 44 is fixedly connected to the top of the wedge-shaped locking block 43. Locking components 45 are provided on the rear sides of the anode connecting line 33 and the cathode connecting line 34. Specifically, the quick-connect circuit mechanism 4 includes multiple main rods 41. The rear sides of the multiple main rods 41 are respectively fixedly connected to the left and right ends of the front side of the electrical box 2. Through the fixed connection between the main rods 41 and the electrical box 2, the main rods 41 are stably installed on the front side of the electrical box 2, providing a mounting carrier for the compression rods 42 and the wedge-shaped locking block 43, ensuring the overall structural stability of the quick-connect circuit mechanism 4. Two compression rods 42 penetrate through the outer wall of the main rods 41. The compression rods 42 can move up and down along the through holes of the main rods 41. The movement of the wedge-shaped locking block 43 provides a power transmission path for subsequent locking or unlocking operations. The bottom of each of the two compression rods 42 is fixedly connected to the wedge-shaped locking block 43. The wedge-shaped locking block 43 changes its position as the compression rod 42 moves. When the wedge-shaped locking block 43 moves downward, it can engage with the locking component 45. When the wedge-shaped locking block 43 moves upward, it can disengage from the locking component 45. Through the fixed connection between the wedge-shaped locking block 43 and the compression rod 42, the power is converted into a locking action. A spring 44 is fixedly connected to the top of the wedge-shaped locking block 43. When the spring 44 is in its natural state, it applies a downward elastic force to the wedge-shaped locking block 43, keeping the wedge-shaped locking block 43 engaged with the locking component 45 and ensuring the stability of the circuit connection. When unlocking is required, the locking component 45 is pressed forward, and the compression rod 42 drives the wedge-shaped locking block 43 to move upward. The spring 44 is compressed and stores elastic potential energy. At this time, the wedge-shaped locking block 43 disengages from the locking component 45, completing the unlocking. After the locking component 45 is removed, the spring 44 releases its elastic potential energy, pushing the wedge-shaped locking block 43 and the compression rod 42 to reset. Through the elastic action of the spring 44, the automatic maintenance of the locked state and the reset after unlocking are achieved, maintaining the stability of the circuit connection without the need for additional fixing structures. Locking components 45 are provided on the rear side of both the anode connecting line 33 and the cathode connecting line 34. The locking components 45 are fixed to the anode connecting line 33 and the cathode connecting line 34. When it is necessary to establish a circuit connection, the locking components 45 on the rear side of the anode connecting line 33 and the cathode connecting line 34 are aligned with the wedge-shaped locking block 43. Under the elastic force of the spring 44, the wedge-shaped locking block 43 is engaged with the locking components 45, thereby realizing the circuit connection between the anode connecting line 33, the cathode connecting line 34 and the electrical box 2.

[0021] Reference Figures 1-3 Sacrificial anodes 36 are fixedly connected to the opposite sides of the two anode fixing sleeves 31. Both sacrificial anodes 36 are made of materials with low electrode potential. The outer walls of both sacrificial anodes 36 are in contact with the ground. The fixing sleeve connecting assembly 37 includes multiple connecting plates 371. The adjacent sides of the multiple connecting plates 371 are fixedly connected to the outer walls of the two anode fixing sleeves 31. Multiple fixing screws 372 are fixedly connected inside the multiple connecting plates 371. The anode circuit connecting assembly 38 includes multiple conductive plates 381. The adjacent sides of the multiple conductive plates 381 are fixedly connected to the left and right sides of the two anode connecting lines 33. Screws 382 pass through the right side of the multiple conductive plates 381. Nuts 383 are threadedly connected to the left side of the two screws 382. Specifically, sacrificial anodes 36 are fixedly connected to the opposite sides of the two anode fixing sleeves 31. The sacrificial anodes 36 are fixedly connected to the anode fixing sleeves 31 to ensure that the sacrificial anodes 36 can be stably attached to the anode fixing sleeves 31. Both sacrificial anodes 36 are made of materials with low electrode potential. When the sacrificial anodes 36 and the oil pipe body 1, which serves as the cathode, form an electrical circuit, the sacrificial anodes 36 with low electrode potential will preferentially undergo an oxidation reaction to release electrons, providing a protective current for the oil pipe body 1. The outer walls of both sacrificial anodes 36 are in contact with the ground. The ground provides a stable installation environment and electrical conduction medium for the sacrificial anodes 36. Through the contact between the sacrificial anodes 36 and the ground, it is ensured that the sacrificial anodes 36 can continuously and stably participate in the electrochemical reaction, providing a continuous anodic current for cathodic protection. The fixed sleeve connection assembly 37 includes multiple connecting plates 371. The adjacent sides of the multiple connecting plates 371 are respectively fixedly connected to the outer walls of the two anode fixed sleeves 31. The connecting plates 371 serve as a connecting medium to initially connect the two anode fixed sleeves 31. Multiple fixing screws 372 are fixedly connected inside the multiple connecting plates 371. The fixing screws 372 penetrate the connecting plates 371 and reinforce the connecting plates 371. The two anode fixed sleeves 31 are tightly connected into a whole through the connecting plates 371 and the fixing screws 372, preventing relative displacement of the anode fixed sleeves 31 during oil well operations, ensuring the relative position stability between the sacrificial anode 36 and the tubing body 1, and ensuring the cathodic protection effect. The anode circuit connection assembly 38 includes multiple conductive plates 381. The adjacent sides of the multiple conductive plates 381 are respectively fixedly connected to the left and right sides of the two anode connection lines 33. The conductive plates 381 have good conductivity and provide a conductive carrier for the circuit connection between the anode connection lines 33 and external components. Each of the multiple conductive plates 381 has a screw 382 through it on its right side, and each of the two screws 382 has a nut 383 threaded to its left side. When it is necessary to establish an anode circuit connection, the screw 382 is passed through the corresponding holes on the conductive plate 381 and the anode fixing sleeve 31 or the sacrificial anode 36. Then, the nut 383 is threaded to the left side of the screw 382 and tightened. The threads of the screw 382 and the nut 383 tightly fix the conductive plate 381 to the anode fixing sleeve 31 or the sacrificial anode 36, realizing the circuit conduction between the anode connection line 33 and the sacrificial anode 36. The current released by the sacrificial anode 36 can be transmitted to the electrical box 2 through the anode connection line 33, and then transmitted to the oil pipe body 1 after being regulated by the electrical box 2, thus completing the closure of the cathodic protection circuit.

[0022] Reference Figures 4-5 The locking assembly 45 includes a support rod 451. The front side of the support rod 451 is fixedly connected to the rear end of the anode connection line 33 and the cathode connection line 34. A locking block 452 is fixedly connected to the left end of the support rod 451. A movable block 453 is slidably connected to the outer wall of the support rod 451. The centralizer mechanism 5 includes two centralizer fixing rings 51. The inner walls of the two centralizer fixing rings 51 are both located on the right side of the outer wall of the tubing body 1. Multiple elastic arms 52 are fixedly connected to the outer walls of the two centralizer fixing rings 51. Wear-resistant blocks 53 are fixedly connected to the outer walls of the multiple elastic arms 52. The same metal frame 54 is fixedly connected inside the two centralizer fixing rings 51. The metal frame 54 is made of alloy steel. Multiple weight-reducing holes are opened on the outer wall of the metal frame 54. Specifically, the locking assembly 45 includes a support rod 451. The front side of the support rod 451 is fixedly connected to the rear end of the anode connecting wire 33 and the cathode connecting wire 34. Through the fixed connection between the support rod 451 and the connecting wire, the locking assembly 45 and the connecting wire form an integral structure and move synchronously with the movement of the connecting wire. A locking block 452 is fixedly connected to the left end of the support rod 451. The locking block 452 can engage with the wedge-shaped locking block 43 in the circuit quick-connect mechanism 4. When the connecting wire approaches the electrical box 2, the locking block 452 pushes the wedge-shaped locking block 43 to move upward. After the locking block 452 reaches the designated position, the wedge-shaped locking block 43 is reset under the action of the spring 44 and engages with the locking block 452, thereby locking the connecting wire to the electrical box 2. The outer wall of the support rod 451 is slidably connected to the movable block 453. When unlocking is required, the movable block 453 is pushed to slide along the outer wall of the support rod 451. The movable block 453 pushes the wedge-shaped locking block 43 to move upward, so that the wedge-shaped locking block 43 disengages from the locking block 452. The sliding of the movable block 453 and the support rod 451 provides a force point for the unlocking operation, thereby achieving rapid unlocking. The centralizer mechanism 5 includes two centralizer fixing rings 51. The inner walls of both centralizer fixing rings 51 are located on the right side of the outer wall of the tubing body 1. The centralizer fixing rings 51 are fixed to the tubing body 1 to ensure that the centralizer mechanism 5 is lowered into the well synchronously with the tubing body 1. Multiple elastic arms 52 are fixedly connected to the outer walls of both centralizer fixing rings 51. The elastic arms 52 have elastic deformation capabilities. When the tubing body 1 is lowered into the well, the elastic arms 52 contact the well wall and deform. Through the elastic force of the elastic arms 52, a reaction force is generated on the well wall to balance the offset tendency of the tubing body 1. Wear-resistant blocks 53 are fixedly connected to the outer walls of the multiple elastic arms 52. The grinding block 53 directly contacts the well wall, reducing frictional wear between the elastic arm 52 and the well wall and extending the service life of the elastic arm 52. The two centralizer fixing rings 51 are both fixedly connected to the same metal frame 54. The metal frame 54 is made of alloy steel, which improves the structural strength of the metal frame 54 and provides support for the centralizer fixing rings 51 and the elastic arm 52, preventing the centralizer mechanism 5 from deforming under stress. The outer wall of the metal frame 54 has multiple weight-reducing holes, which reduce the overall weight of the metal frame 54, thereby reducing the additional load of the centralizer mechanism 5 on the tubing body 1 and ensuring that the tubing body 1 can be smoothly lowered into the well.

[0023] Working principle: Align the adjacent sides of the two anode fixing sleeves 31 with the front and rear sides of the outer wall of the tubing body 1, respectively. By sliding the anode fixing sleeves 31 against the outer wall of the tubing body 1, adjust the anode fixing sleeves 31 to the designated position on the tubing body 1, completing the initial assembly of the anode fixing sleeves 31 and the tubing body 1. Then, use the fixing sleeve connecting assembly 37 to reinforce the two anode fixing sleeves 31. Multiple connecting plates 371 in the fixing sleeve connecting assembly 37 are fixedly connected to the outer walls of the two anode fixing sleeves 31 on their adjacent sides, and the two anode fixing sleeves 31 are initially connected by the connecting plates 371. Then, multiple fixing screws 372 pass through the connecting plates 371 and fix them. The two anode fixing sleeves 31 are tightly connected into a whole by the connecting plates 371 and the fixing screws 372, preventing the anode fixing sleeves 31 from loosening in subsequent operations and ensuring the stability of the relative position between the anode fixing sleeves 31 and the tubing body 1. Next, the sacrificial anode 36 and the anode fixing sleeve 31 are assembled. The sacrificial anode 36 is fixedly connected to the opposite side of the two anode fixing sleeves 31, so that the sacrificial anode 36 is stably attached to the anode fixing sleeve 31. At the same time, the outer walls of the two sacrificial anodes 36 are brought into contact with the ground. The ground provides a stable installation environment and electrical conduction medium for the sacrificial anodes 36, ensuring that the sacrificial anodes 36 can continuously participate in the electrochemical reaction. Then, the cathode connecting sleeve 32 is installed and fixedly connected to the outer wall of the oil pipe body 1, so that the cathode connecting sleeve 32 and the oil pipe body 1 are fixed, ensuring that the cathode connecting sleeve 32 can stably obtain the cathode signal of the oil pipe body 1. A base rod 35 is fixedly connected to the bottom of the electrical box 2. The base rod 35, in contact with the mounting surface, stably supports the electrical box 2 in the designated position, preventing displacement during operation that could affect circuit connections and signal processing. An anode connection line 33 is located on the front left side of the electrical box 2. One end of the anode connection line 33 is connected to the electrical box 2, and the other end is connected to the anode fixing sleeve 31 via the anode circuit connection assembly 38. Multiple conductive plates 381 in the anode circuit connection assembly 38 are fixedly connected to the left and right sides of two anode connection lines 33, respectively. Screws 382 are passed through the corresponding holes on the conductive plates 381 and the anode fixing sleeve 31 or sacrificial anode 36. Nuts 383 are then threaded onto the left side of the screws 382 and tightened. The threads of the screws 382 and nuts 383 tightly fix the conductive plates 381 to the anode fixing sleeve 31 or sacrificial anode 36, thus achieving circuit connection between the anode connection line 33 and the sacrificial anode 36. The current released by the sacrificial anode 36 can be transmitted to the electrical box 2 through the anode connection line 33. At the same time, the top of the cathode connection sleeve 32 is fixedly connected to the cathode connection line 34. One end of the cathode connection line 34 is connected to the cathode connection sleeve 32, and the other end is connected to the electrical box 2. The cathode signal obtained by the cathode connection sleeve 32 is transmitted to the electrical box 2 through the cathode connection line 34. After receiving the anode current signal transmitted by the anode connection line 33 and the cathode signal transmitted by the cathode connection line 34, the electrical box 2 processes the signals and regulates the current output to keep the oil pipe body 1 in a suitable cathodic protection state and prevent the oil pipe body 1 from being damaged by corrosion. In this process, the sacrificial anode 36 is made of a material with a low electrode potential. When the sacrificial anode 36 and the oil pipe body 1, which serves as the cathode, form an electrical circuit, the sacrificial anode 36 with a low electrode potential will preferentially undergo an oxidation reaction to release electrons, providing a continuous protective current for the oil pipe body 1 and ensuring the stability of the cathodic protection effect. When the tubing body 1 needs to be lowered into the oil well, a centralizer mechanism 5 is installed on the right side of the tubing body 1. The centralizer mechanism 5 is lowered into the oil well synchronously with the tubing body 1. The inner walls of the two centralizer fixing rings 51 in the centralizer mechanism 5 are both located on the right side of the outer wall of the tubing body 1 and are fixed to the tubing body 1 to ensure that the centralizer mechanism 5 moves synchronously with the tubing body 1. Multiple elastic arms 52 are fixedly connected to the outer walls of the two centralizer fixing rings 51. The elastic arms 52 have elastic deformation capabilities. When the tubing body 1 is lowered into the oil well, the elastic arms 52 contact the well wall and deform. The elastic force of the elastic arms 52 generates a reaction force on the well wall, balancing the offset tendency of the tubing body 1 and preventing the tubing body 1 from deviating during the descent. At the same time, wear-resistant blocks 53 are fixedly connected to the outer walls of multiple elastic arms 52. The wear-resistant blocks 53 are in direct contact with the well wall, reducing the frictional wear between the elastic arms 52 and the well wall and extending the service life of the elastic arms 52. The same metal frame 54 is fixedly connected inside the two centralizer fixing rings 51. The metal frame 54 is made of alloy steel, which improves the structural strength of the metal frame 54 and provides support for the centralizer fixing rings 51 and elastic arms 52, preventing the centralizer mechanism 5 from deforming under stress. In addition, multiple weight-reducing holes are opened on the outer wall of the metal frame 54 to reduce the overall weight of the metal frame 54, thereby reducing the additional load of the centralizer mechanism 5 on the tubing body 1 and ensuring that the tubing body 1 can be smoothly lowered into the designated position. The circuit quick-connect mechanism 4 includes multiple main rods 41. The rear sides of the multiple main rods 41 are respectively fixedly connected to the left and right ends of the front side of the electrical box 2, providing a stable mounting carrier for the compression rods 42 and the wedge-shaped locking blocks 43. Two compression rods 42 pass through the outer wall of the main rods 41, and the compression rods 42 can move up and down along the through holes of the main rods 41. The bottom of each compression rod 42 is fixedly connected to a wedge-shaped locking block 43, and the top of the wedge-shaped locking block 43 is fixedly connected to a spring 44. Locking components 45 are provided on the rear sides of the anode connecting line 33 and the cathode connecting line 34. The locking components 45 include a support rod 451, a locking block 452, and a movable block 453. The front side of the support rod 451 is fixedly connected to the rear end of the anode connecting line 33 and the cathode connecting line 34. The locking block 452 is fixedly connected to the left end of the support rod 451. The movable block 453 is slidably connected to the outer wall of the support rod 451. When it is necessary to disconnect the circuit, the movable block 453 is pushed to slide along the outer wall of the support rod 451. The wedge-shaped locking block 43 moves upward, and the compression rod 42 moves upward synchronously with the wedge-shaped locking block 43. The spring 44 is compressed and stores elastic potential energy. At this time, the wedge-shaped locking block 43 and the locking block 452 disengage, and the anode connection line 33 and the cathode connection line 34 can be directly removed, quickly disconnecting the circuit connection between the electrical box 2 and the connection line. This eliminates the need for cumbersome wire disassembly operations, simplifies the disassembly process, and improves the efficiency of oil well maintenance operations. When reconnecting the circuit after maintenance, the locking block 452 on the back of the anode connection line 33 and the cathode connection line 34 is aligned with the wedge-shaped locking block 43. The locking block 452 pushes the wedge-shaped locking block 43 upward. After the locking block 452 reaches the designated position, the spring 44 releases its elastic potential energy, pushing the wedge-shaped locking block 43 and the compression rod 42 to reset. The wedge-shaped locking block 43 and the locking block 452 re-engage, realizing the circuit connection between the anode connection line 33, the cathode connection line 34 and the electrical box 2, restoring the cathodic protection function of the device, and continuously providing corrosion protection for the tubing body 1.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cathodic protection device for tubing adapted to various types of oil wells, comprising a tubing body (1) and an electrical box (2), characterized in that: The outer wall of the oil pipe body (1) is provided with a cathodic protection mechanism (3), which is used to protect the cathode of the oil pipe. The front side of the electrical box (2) is provided with a circuit quick-connect mechanism (4), which is used to quickly disassemble the protection device. The right side of the oil pipe body (1) is provided with a centralizer mechanism (5). The cathodic protection mechanism (3) includes two anode fixing sleeves (31). The two anode fixing sleeves (31) are slidably connected to the front and rear sides of the outer wall of the oil pipe body (1). The outer wall of the oil pipe body (1) is fixedly connected to a cathode connecting sleeve (32). Two anode connecting lines (33) are provided at the front left end of the electrical box (2). A cathode connecting line (34) is fixedly connected to the top of the cathode connecting sleeve (32). A bottom rod (35) is fixedly connected to the bottom end of the electrical box (2). Two fixing sleeve connecting assemblies (37) are provided between the two adjacent anode fixing sleeves (31). An anode circuit connecting assembly (38) is provided at the bottom of the anode connecting line (33).

2. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 1, characterized in that: The circuit quick-connect mechanism (4) includes multiple main rods (41), the rear sides of which are fixedly connected to the left and right ends of the front side of the electrical box (2). Two compression rods (42) penetrate the outer wall of the main rods (41), and wedge-shaped locking blocks (43) are fixedly connected to the bottom of the two compression rods (42). A spring (44) is fixedly connected to the top of the wedge-shaped locking blocks (43). Locking components (45) are provided on the rear sides of the anode connecting line (33) and the cathode connecting line (34).

3. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 1, characterized in that: Sacrificial anodes (36) are fixedly connected to the opposite side of the two anode fixing sleeves (31). Both sacrificial anodes (36) are made of materials with low electrode potential, and the outer walls of both sacrificial anodes (36) are in contact with the ground.

4. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 1, characterized in that: The fixed sleeve connection assembly (37) includes multiple connecting plates (371), with each adjacent side of the multiple connecting plates (371) fixedly connected to the outer wall of two anode fixed sleeves (31), and multiple fixing screws (372) fixedly connected inside each of the multiple connecting plates (371).

5. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 1, characterized in that: The anode circuit connection assembly (38) includes multiple conductive plates (381). The adjacent sides of the multiple conductive plates (381) are respectively fixedly connected to the left and right sides of the two anode connection lines (33). The right side of each of the multiple conductive plates (381) is penetrated by a screw (382), and the left side of each of the two screws (382) is threaded with a nut (383).

6. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 2, characterized in that: The locking assembly (45) includes a support rod (451), the front side of which is fixedly connected to the rear end of the anode connecting line (33) and the cathode connecting line (34), a locking block (452) is fixedly connected to the left end of the support rod (451), and a movable block (453) is slidably connected to the outer wall of the support rod (451).

7. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 1, characterized in that: The centralizer mechanism (5) includes two centralizer fixing rings (51). The inner walls of the two centralizer fixing rings (51) are both located on the right side of the outer wall of the oil pipe body (1). Multiple elastic arms (52) are fixedly connected to the outer walls of the two centralizer fixing rings (51), and wear-resistant blocks (53) are fixedly connected to the outer walls of the multiple elastic arms (52).

8. The tubing cathodic protection device adapted to multiple types of oil wells according to claim 7, characterized in that: The two centralizer fixing rings (51) are both fixedly connected to the same metal frame (54). The metal frame (54) is made of alloy steel and has multiple weight-reducing holes on its outer wall.

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