Internal electroplating device for J-value thread of tubing coupling

Abstract

The utility model discloses an internal electroplating device of tubing coupling J value threads, which comprises an electroplating bath, a metal hanging basket, an internal electroplating tool, cathode rods, bamboo joint type pictographic anode rods and an outer wall protective sleeve, the two cathode rods are fixed at the top end of the electroplating bath, the bottom end of the metal hanging basket is inserted into the inner side of the electroplating bath, and the inner wall protective sleeve is fixed at the bottom end of the metal hanging basket. The top end of the metal hanging basket is hung on the two cathode rods, and an oil pipe coupling is placed on the inner side of the outer wall protection sleeve. Before the couplings are electroplated, the inner plating tools are arranged at the two ends of each coupling, the outer wall protection sleeve is placed in the hanging basket, and the couplings with the inner plating tools are placed in the hanging basket; then, a conformal anode is inserted into the coupling to achieve electroplating machining, and the outer wall of the coupling is better protected against corrosion of the electroplating solution in the electroplating pretreatment and electroplating process in the electroplating process; the problem of thread corrosion at the J value is solved, the thickness can be increased according to the use environment, and normal use of other screw threads is not affected; and the anode rod adopts conformal anode electroplating.

Description

Technical Field

[0001] The utility model belongs to the technical field of electroplating, and in particular relates to an internal electroplating device for a J-value thread of an oil pipe coupling. Background Art

[0002] At present, in the field of oilfield corrosion and protection, the corrosion inside the oil pipe coupling is particularly serious, especially in the middle and late stages of crude oil production in most domestic oil fields. Oil wells, oil and gas mixed wells, and water injection wells contain corrosive substances such as H2S, CO2, O2, and sulfate-reducing bacteria. The environment is relatively harsh and the degree of corrosion continues to increase. After the oil pipe and the coupling are connected in pairs, the J value of the coupling will be exposed to the well fluid for a long time. The so-called J value is the remaining thread in the middle of the coupling that is not occupied by the connecting thread after the oil pipe is connected in pairs through the coupling. In some wells with high mineralization, long-term production will inevitably cause the thread failure at the J value of the coupling, sometimes accompanied by the precipitation of wax points. Wax scale is continuously deposited at the J value of the coupling, causing the load on the sucker rod to increase. At the same time, the liquid gradually penetrates into the inside of the threaded connection, and the corrosion rate increases, resulting in the failure of the pipe coupling;

[0003] The corrosion protection at the J value of the coupling in the prior art has the following problems:

[0004] 1. The lining at the J value of the coupling is anti-corrosive, which is difficult to process and takes a long time. The thread at the J value needs to be turned off by a lathe. After the polyethylene lining ring is placed, it is expanded and sealed. In the oil well fluid, the lining ring is easily affected by the temperature and deformed, so that the contact wall cannot be completely fitted, and the well fluid penetrates into it to cause corrosion, and the anti-corrosion effect is poor.

[0005] 2. The J value anti-corrosion process of the inner coating is single, and a layer of coating is sprayed at the J value; the coating has poor anti-penetration ability, and the coating will form bulges and gradually fall off after long-term operation;

[0006] 3. The traditional electroplating technology of couplings is to electroplate the entire coupling, which has limitations on thickness requirements. If the electroplating thickness is too thick, it will cause sticking when the coupling is screwed. During electroplating, the outer wall of the coupling is completely immersed in the plating solution, and the plating solution will micro-corrode the outer wall of the coupling.

[0007] For this purpose, the utility model provides an internal electroplating device for a J-value thread of an oil pipe coupling. Utility Model Content

[0008] The utility model aims to provide an internal electroplating device for J-value threads of an oil pipe coupling to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an internal electroplating device for a J-value thread of an oil pipe coupling, comprising an electroplating tank, a metal hanging basket, an internal plating tool, a cathode rod, a bamboo-shaped elegantic anode rod and an outer wall protective sleeve, two cathode rods are fixed at the top of the electroplating tank, the bottom end of the metal hanging basket is inserted into the inner side of the electroplating tank, and the top end of the metal hanging basket is suspended on the two cathode rods, an oil pipe coupling is placed on the inner side of the outer wall protective sleeve, both ends of the oil pipe coupling are provided with an integrated threaded end, the surface threaded sleeve of the threaded end is provided with an internal plating tool, the oil pipe coupling and the outer wall protective sleeve adopt a transition fit, the bamboo-shaped elegantic anode rod is inserted into the inner side of the outer wall protective sleeve, and passes through the inner side of the oil pipe coupling.

[0010] Preferably, the inner plating tool is threadedly connected to the threaded end, and the inner plating tool is flush with the end surface of the threaded end.

[0011] Preferably, the top end of the bamboo-shaped anode rod extends to the top of the electroplating tank.

[0012] Preferably, it also includes a limiting structure, which is arranged between the electroplating tank and the metal hanging basket, and the limiting structure includes a side seat fixed to the side of the electroplating tank, an inner slide groove is opened in the side seat, an inner slide block and a spring are arranged in the inner slide groove, a movable column is fixed to the top of the inner slide block, the top of the movable column extends to the top of the side seat, and a pressure plate is rotatably installed, the pressure plate is located at the top of the electroplating tank, and one end of the pressure plate extends to the top surface of the metal hanging basket, a limiting block is fixed to the bottom surface of the pressure plate, and a limiting hole corresponding to the limiting block is opened at the top of the metal hanging basket, and the limiting block is embedded in the limiting hole.

[0013] Preferably, a top hole is formed on the top surface of the side seat, and the top hole corresponds to the movable column.

[0014] Preferably, a shaft is fixed to the top surface of the movable column, and the pressure plate is rotatably sleeved on the shaft.

[0015] Compared with the prior art, the utility model has the following beneficial effects: before the electroplating of the coupling, the utility model puts inner plating tooling on both ends of each coupling, puts the outer wall protection cover into the hanging basket, and puts the coupling with the inner plating tooling into the hanging basket; then inserts the pictographic anode into the coupling to realize the electroplating process, and during the electroplating process, the outer wall of the coupling is better protected from corrosion by the plating solution during the pre-treatment and electroplating process; the thread corrosion problem at the J value is solved, the thickness can be increased according to the use environment, and the normal use of other threads is not affected; the anode rod adopts the pictographic anode for electroplating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the utility model;

[0017] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A area;

[0018] Figure 3 For this utility model Figure 1 A partial enlarged view of the middle limit structure;

[0019] In the figure: 1. electroplating tank; 2. metal hanging basket; 3. oil pipe coupling; 31. threaded end; 4. internal plating tooling; 5. cathode rod; 6. bamboo-shaped pictographic anode rod; 7. outer wall protection cover; 8. limiting structure; 81. side seat; 82. inner slide groove; 83. inner slide block; 84. spring; 85. movable column; 86. pressure plate; 87. limiting block; 88. limiting hole; 89. shaft rod. DETAILED DESCRIPTION

[0020] 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. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example 1

[0022] See also Figure 1 and Figure 2 , is the first embodiment of the utility model, which provides a technical solution: an internal electroplating device for a J-value thread of an oil pipe coupling, comprising an electroplating tank 1, a metal hanging basket 2, an internal plating tool 4, a cathode rod 5, a bamboo-shaped pictographic anode rod 6 and an outer wall protective sleeve 7, two cathode rods 5 are fixed at the top of the electroplating tank 1, the bottom end of the metal hanging basket 2 is inserted into the inner side of the electroplating tank 1, and the top end of the metal hanging basket 2 is suspended on the two cathode rods 5, an oil pipe coupling 3 is placed on the inner side of the outer wall protective sleeve 7, both ends of the oil pipe coupling 3 are provided with an integrated threaded end 31, the surface thread sleeve of the threaded end 31 is provided with an internal plating tool 4, the oil pipe coupling 3 and the outer wall protective sleeve 7 adopt a transition fit, the bamboo-shaped pictographic anode rod 6 is inserted into the inner side of the outer wall protective sleeve 7, and passes through the inner side of the oil pipe coupling 3.

[0023] The inner plating tool 4 is threadedly connected to the threaded end 31 , the end faces of the inner plating tool 4 and the threaded end 31 are flush, and the top end of the bamboo-shaped pictographic anode rod 6 extends to the top of the electroplating tank 1 .

[0024] In summary, in actual use, first screw an inner plating tool 4 on the two threaded ends 31 at both ends of the oil pipe coupling 3, and make the inner plating tool 4 flush with the end surface of the threaded end 31, then put the oil pipe coupling 3 into the outer wall protective sleeve 7, the outer wall protective sleeve 7 and the oil pipe coupling 3 adopt a transition fit, and then put the oil pipe coupling 3 with the outer wall protective sleeve 7 into the metal hanging basket 2, and then put the metal hanging basket 2 into the inner side of the electroplating tank 1, and hang the top of the metal hanging basket 2 on the cathode rod 5, the oil pipe couplings 3 are stacked and arranged, and finally the bamboo-shaped pictographic anode rod 6 is inserted into the oil pipe coupling 3 to realize electroplating processing, so as to realize separate electroplating at the J value of the oil pipe coupling, solve the problem that the J value of the existing oil pipe coupling is easy to corrode, and improve the overall anti-corrosion effect.

[0025] Example 2

[0026] See also Figures 1 to 3 , which is the second embodiment of the utility model, is based on the previous embodiment, and the difference is that the metal hanging basket 2 can be pressed and limited by the setting of the limiting structure 8, thereby ensuring the suspension stability of the metal hanging basket 2 and the internal oil pipe coupling 3 and other components during the subsequent electroplating process.

[0027] Specifically, it also includes a limiting structure 8, which is arranged between the electroplating tank 1 and the metal hanging basket 2. The limiting structure 8 includes a side seat 81 fixed to the side of the electroplating tank 1, an inner slide groove 82 is provided in the side seat 81, and an inner slide block 83 and a spring 84 are provided in the inner slide groove 82. A movable column 85 is fixed to the top of the inner slide block 83, and the top of the movable column 85 extends to the top of the side seat 81, and a pressure plate 86 is rotatably installed. The pressure plate 86 is located at the top of the electroplating tank 1, and one end of the pressure plate 86 extends to the top surface of the metal hanging basket 2, which can play a role in pressing and limiting the metal hanging basket 2, thereby improving the suspension stability of the metal hanging basket 2. The limiting block 87 is welded and fixed on the bottom surface of the pressing plate 86, and a limiting hole 88 corresponding to the limiting block 87 is opened on the top of the metal hanging basket 2. The limiting block 87 is embedded in the limiting hole 88 to ensure that the pressing plate 86 will not move away from the top of the metal hanging basket 2 by itself during daily electroplating. Only when the operator lifts the pressing plate 86, so that the movable column 85 slides up with the inner slider 83, and the spring 84 is gradually compressed, the limiting block 87 will move out of the limiting hole 88. At this time, the pressing plate 86 can be rotated and removed from the top of the oil pipe coupling 3, the limiting of the metal hanging basket 2 is released, and the normal taking and placing of the metal hanging basket 2 is realized.

[0028] Among them, a top hole is opened on the top surface of the side seat 81, and the top hole corresponds to the movable column 85, so that the movable column 85 can pass through smoothly. A shaft rod 89 is fixed on the top surface of the movable column 85, and the pressure plate 86 is rotatably sleeved on the shaft rod 89, so that the pressure plate 86 can be smoothly rotatably connected with the movable column 85 and rotate at the top of the movable column 85.

[0029] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal electroplating device for J-value threads of oil pipe couplings, characterized by: The invention comprises an electroplating tank (1), a metal hanging basket (2), an inner plating tool (4), a cathode rod (5), a bamboo-shaped pictographic anode rod (6) and an outer wall protective sleeve (7). Two cathode rods (5) are fixed at the top of the electroplating tank (1). The bottom end of the metal hanging basket (2) is inserted into the inner side of the electroplating tank (1), and the top end of the metal hanging basket (2) is suspended on the two cathode rods (5). An oil pipe coupling (3) is placed on the inner side of the outer wall protective sleeve (7). Both ends of the oil pipe coupling (3) are provided with an integrated threaded end (31). The surface threaded sleeve of the threaded end (31) is provided with an inner plating tool (4). The oil pipe coupling (3) and the outer wall protective sleeve (7) adopt a transition fit. The bamboo-shaped pictographic anode rod (6) is inserted into the inner side of the outer wall protective sleeve (7) and passes through the inner side of the oil pipe coupling (3).

2. The internal electroplating device for J-value threads of a tubing coupling according to claim 1, characterized in that: The inner plating tool (4) is threadedly connected to the threaded end (31), and the end surfaces of the inner plating tool (4) and the threaded end (31) are flush.

3. The internal electroplating device for J-value threads of a tubing coupling according to claim 1, characterized in that: The top end of the bamboo-shaped pictographic anode rod (6) extends to the top of the electroplating tank (1).

4. The internal electroplating device for J-value threads of a pipe coupling according to claim 1, characterized in that: It also includes a limiting structure (8), which is arranged between the electroplating tank (1) and the metal hanging basket (2).

5. The internal electroplating device for J-value threads of a tubing coupling according to claim 4, characterized in that: The limiting structure (8) includes a side seat (81) fixed to the side of the electroplating tank (1), an inner slide groove (82) is provided in the side seat (81), an inner slider (83) and a spring (84) are provided in the inner slide groove (82), a movable column (85) is fixed to the top of the inner slider (83), the top end of the movable column (85) extends to the top of the side seat (81), and a pressure plate (86) is rotatably installed, the pressure plate (86) is located at the top of the electroplating tank (1), and one end of the pressure plate (86) extends to the top surface of the metal hanging basket (2).

6. The internal electroplating device for J-value threads of a tubing coupling according to claim 5, characterized in that: A limiting block (87) is fixed on the bottom surface of the pressing plate (86), and a limiting hole (88) corresponding to the limiting block (87) is opened on the top of the metal hanging basket (2), and the limiting block (87) is embedded in the limiting hole (88).

7. The internal electroplating device for J-value threads of a tubing coupling according to claim 5, characterized in that: A top hole is provided on the top surface of the side seat (81), and the top hole corresponds to the movable column (85).

8. The internal electroplating device for J-value threads of a pipe coupling according to claim 5, characterized in that: A shaft (89) is fixed to the top surface of the movable column (85), and the pressing plate (86) is rotatably sleeved on the shaft (89).

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