Injection molding righting block surface organic coating type anticorrosion sucker rod

Abstract

Injection molding righting block surface organic coating type anticorrosion sucker rod relates to the technical field of sucker rod, including the sucker rod body, a plurality of limit blocks are fixed on the sucker rod body along the axial direction, the area between the adjacent limit blocks of the sucker rod body is provided with a wax scraper along the axial direction sliding, the wax scraper is also provided along the circumferential rotation, the axial position of the limit block on the sucker rod body is adjusted by the adjusting structure.The utility model solves the problem that the axial direction of the wax scraper and the sucker rod is limited in the traditional technology when using, the wax scraper is lifted along with the sucker rod, and the righting waxing range of the wax scraper is reduced;when the axial direction of the limit block on the existing sucker rod is limited to the wax scraper, the limit block and the sucker rod are fixedly arranged, and the movement stroke of the wax scraper cannot be adjusted according to different use scenes.

Description

Technical Field

[0001] This utility model relates to the field of sucker rod technology, specifically to an anti-corrosion sucker rod with an organic coating on the surface of an injection-molded straightening block. Background Technology

[0002] During oil production, sucker rods operate in well fluids containing corrosive media, leading to frequent accidents of sucker rods breaking due to corrosion fatigue. This results in short oil well production cycles and a decline in the economic benefits of the oil field.

[0003] The sucker rod is a slender rod in a pumping well. It connects to the polished rod at the top and the pump at the bottom to transmit power. In rod pump pumping systems for oil wells, there is unavoidable wear between the hollow sucker rod and the tubing, especially in deep and deviated wells. The sucker rod is prone to bending inside the tubing, resulting in serious sucker rod wear on the tubing.

[0004] A prior art patent, CN221481857U, discloses a method comprising a female connector, a conventional sucker rod, and a reducing connector connected in sequence. The conventional sucker rod has a long, straight shaft in the middle, covered with a PE coating. The upset portions at both ends of the conventional sucker rod are injection-molded with straightening and sealing devices. The coating only covers the long, straight shaft portion, simplifying the process. The uncoated portions at both ends are injection-molded with straightening and sealing devices that have built-in support ribs, extending to the stainless steel female connector and stainless steel reducing connector at each end, overlapping with the coating. The injection-molded portion and the coating together cover the entire conventional sucker rod, achieving complete isolation between the rod and the oil, providing corrosion and wear resistance, and extending the rod's service life.

[0005] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects:

[0006] First, the existing wax scraper on the sucker rod is limited in axial direction to the sucker rod during use, causing it to rise and fall with the sucker rod, which reduces the range of the wax scraper for straightening and scraping.

[0007] Secondly, when the limiting block on the existing sucker rod limits the axial direction of the wax scraper, the movement stroke of the wax scraper cannot be adjusted according to different usage scenarios because the limiting block and the sucker rod are fixedly set.

[0008] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model solves the problem that in traditional technologies, the wax scraper on the sucker rod is limited in axial direction during use, causing it to rise and fall with the sucker rod, thus reducing the range of wax scraping. Furthermore, when the existing limit block on the sucker rod limits the axial direction of the wax scraper, the fixed setting between the limit block and the sucker rod makes it impossible to adjust the stroke of the wax scraper according to different usage scenarios.

[0010] To solve the above problems, this utility model provides the following technical solution:

[0011] The injection-molded straightening block surface organic coating type anti-corrosion sucker rod includes a sucker rod body, on which several limiting blocks are fixed axially. A wax scraper is slidably provided axially in the area between adjacent limiting blocks on the sucker rod body. The wax scraper is also rotatably arranged circumferentially. The axial position of the limiting blocks on the sucker rod body is adjusted by an adjustment structure.

[0012] As an optimized solution, the limiting block includes two limiting sleeves that are semi-circularly mated together, and the mating surfaces of the two limiting sleeves are detachably connected by the adjustment structure.

[0013] As an optimized solution, the adjustment structure includes two stepped holes arranged side by side from top to bottom on the outer wall of each limiting sleeve. The mating surface of the limiting sleeve is provided with a threaded groove corresponding to the stepped hole. A bolt is inserted into the stepped hole, and the end of the bolt is threadedly connected to the threaded groove.

[0014] As an optimized solution, the stepped holes on the two limiting sleeves are arranged in a rotationally symmetrical manner.

[0015] As an optimized solution, an arc-shaped pressure plate is provided radially on the inner wall of each of the limiting sleeves, and the arc-shaped pressure plate abuts against the outer wall of the sucker rod body.

[0016] As an optimized solution, the arc-shaped pressure plate has several stop protrusions evenly distributed on the side wall facing the sucker rod body.

[0017] As an optimized solution, the inner wall of the limiting sleeve is provided with a sliding groove that matches the arc-shaped pressure plate, and the arc-shaped pressure plate is slidably installed in the sliding groove.

[0018] As an optimized solution, the slide groove is provided with horizontal guide grooves arranged in parallel from top to bottom, and the back of the arc-shaped pressure plate is fixedly connected with a guide post that is slidably inserted into the guide groove.

[0019] As an optimized solution, a screw is horizontally fixed to the back of the arc-shaped pressure plate between the two guide posts. The limiting sleeve has a through hole to avoid the screw. The other end of the screw passes through the through hole and is threaded with two locking nuts.

[0020] As an optimized solution, a hidden groove communicating with the through hole is provided on the outer wall of the limiting sleeve, the other end of the screw is located in the hidden groove, and the locking nut near the arc-shaped pressure plate abuts against the bottom of the hidden groove.

[0021] As an optimized solution, threaded connectors are provided at both the upper and lower ends of the sucker rod body, and the threaded connectors of adjacent sucker rods are connected by connecting couplings.

[0022] As an optimized solution, the surface of the sucker rod body is sequentially coated with a thermosetting primer coating and a modified epoxy resin layer.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] The surface of the sucker rod body is sequentially coated with a thermosetting primer and a modified epoxy resin layer. The double-layer coating ensures strong adhesion and a dense coating, preventing the rod from being exposed to corrosive media and causing corrosion. The smooth surface of the rod body effectively reduces wax and scale buildup on the sucker rod surface, thus reducing downhole friction resistance.

[0025] The wax scraper can slide between two limit blocks, allowing it to rotate and slide freely within a large range on the rod. This prevents uneven wear and reduces oil flow resistance. The longer range of motion greatly improves the wax scraping effect of the wax scraper.

[0026] The distance between the two limiting blocks is relatively large, and the diameter of the limiting blocks is slightly smaller than the diameter of the wax scraper. It can play a straightening role during the operation of the rod. The structure is similar to a fixed straightener, which plays a role in straightening the wax scraper. It has a wide range of uses and high application value.

[0027] The adjustable position of the limit blocks allows for adjustment of the spacing between adjacent limit blocks according to different usage scenarios and lifting strokes, thereby adjusting the movement stroke of the wax scraper and expanding its application range. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0029] Figure 1This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the limiting block of this utility model;

[0031] Figure 3 This is a structural schematic diagram of the limiting block in the axial section direction of this utility model.

[0032] In the diagram: 1-Sucker rod body; 2-Limit block; 3-Wax scraper; 4-Limit sleeve; 5-Stepped hole; 6-Bolt; 7-Threaded groove; 8-Arc-shaped pressure plate; 9-Stop protrusion; 10-Slide groove; 11-Guide post; 12-Screw rod; 13-Hidden groove; 14-Locking nut; 15-Threaded connector; 16-Connecting coupling. Detailed Implementation

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0034] like Figures 1 to 3 As shown, the injection-molded straightening block surface organic coating type anti-corrosion sucker rod includes a sucker rod body 1, a number of limiting blocks 2 are fixed on the sucker rod body 1 along the axial direction, a wax scraper 3 is provided in the area between adjacent limiting blocks 2 of the sucker rod body 1 along the axial direction, the wax scraper 3 is also rotatably arranged in the circumferential direction, and the axial position of the limiting blocks 2 on the sucker rod body 1 is adjusted by the adjustment structure.

[0035] The limiting block 2 includes two limiting sleeves 4 arranged in a semi-circular butt joint, and the mating surfaces of the two limiting sleeves 4 are detachably connected by an adjustment structure.

[0036] The adjustment structure includes two stepped holes 5 arranged side by side from top to bottom on the outer wall of each limiting sleeve 4. The mating surface of the limiting sleeve 4 is provided with a threaded groove 7 corresponding to the stepped hole 5. A bolt 6 is inserted into the stepped hole 5, and the end of the bolt 6 is threadedly connected to the threaded groove 7.

[0037] The stepped holes 5 on the two limiting sleeves 4 are arranged in a rotationally symmetrical manner.

[0038] Each limiting sleeve 4 has an arc-shaped pressure plate 8 that slides radially on its inner wall, and the arc-shaped pressure plate 8 abuts against the outer wall of the sucker rod body 1.

[0039] The arc-shaped pressure plate 8 has several stop protrusions 9 evenly distributed on the side wall facing the sucker rod body 1 to increase the friction with the sucker rod body 1.

[0040] The inner wall of the limiting sleeve 4 is provided with a sliding groove 10 that matches the arc-shaped pressure plate 8, and the arc-shaped pressure plate 8 is slidably installed in the sliding groove 10.

[0041] The slide groove 10 has horizontal guide grooves arranged in parallel from top to bottom, and the back of the arc-shaped pressure plate 8 is fixed with a guide post 11 that is slidably inserted into the guide groove.

[0042] A screw 12 is horizontally fixed to the back of the arc-shaped pressure plate 8 between the two guide posts 11. A through hole is provided on the limiting sleeve 4 to avoid the screw 12. The other end of the screw 12 passes through the through hole and is threaded with two locking nuts 14. The two locking nuts 14 can improve the locking stability of the screw 12. When adjusting the position of the arc-shaped pressure plate 8, first screw in one locking nut 14. The locking nut 14 abuts against the hidden groove 13, pushing the screw 12 to move, thereby fixing the arc-shaped pressure plate 8 against the sucker rod body 1. Then screw in the other locking nut 14 to lock it.

[0043] The outer wall of the limiting sleeve 4 is provided with a hidden groove 13 that communicates with the through hole. The other end of the screw 12 is located in the hidden groove 13, and the locking nut 14 near the arc-shaped pressure plate 8 abuts against the bottom of the hidden groove 13.

[0044] The upper and lower ends of the sucker rod body 1 are respectively provided with threaded connectors 15, and the threaded connectors 15 of adjacent sucker rods are threadedly connected by connecting clamps 16.

[0045] The connecting coupling 16 is made of alloy steel, and its performance meets the requirements of standard products and fully satisfies production needs. The surface is covered with a sprayed metal layer with a thickness of 0.25mm-0.51mm on one side, covering the entire outer diameter and the outer diameter end face, and has excellent corrosion resistance and wear resistance.

[0046] The surface of the sucker rod body is sequentially coated with a thermosetting primer and a modified epoxy resin layer.

[0047] The rod body is made of high-quality alloy steel and undergoes surface quenching on the basis of tempering heat treatment, so that its mechanical properties reach the requirements of H grade, with a tensile strength of 1050-1350Mpa, and has ultra-high tensile strength and excellent plasticity index; while ensuring load-bearing capacity, it also ensures fatigue strength; and it can achieve excellent wear resistance and tensile strength.

[0048] The wax scraper has four spiral scraping ribs, enabling all-around wax scraping and providing a significant wax and dirt removal effect.

[0049] The scraper 3 can rotate freely within a large range on the rod, which prevents uneven wear and reduces oil flow resistance. The long range of motion can greatly improve the scraping effect of the scraper 3.

[0050] The material of the wax scraper 3 is fiber-reinforced plastic, which is a composite material with a polymer matrix reinforced by fibers. This material is formed by embedding fiber materials (such as glass fiber, carbon fiber, etc.) into the plastic matrix to form a new type of material with high performance, high strength and high elasticity.

[0051] The matrix of fiber-reinforced plastics can be polymer, metal or ceramic, while the reinforcement is a substance such as fibers, particles or whiskers dispersed in the matrix.

[0052] The working principle of this device is as follows:

[0053] The surface of the sucker rod body is sequentially coated with a thermosetting primer and a modified epoxy resin layer. The double-layer coating ensures strong adhesion and a dense coating, preventing the rod from being exposed to corrosive media and causing corrosion. The smooth surface of the rod body effectively reduces wax and scale buildup on the sucker rod surface, thus reducing downhole friction resistance.

[0054] The wax scraper 3 can slide in the area between the two limit blocks 2, which allows it to rotate and slide freely in a large range on the rod body. This prevents uneven wear and reduces oil flow resistance. The longer range of motion greatly improves the wax scraping effect of the wax scraper 3.

[0055] The distance between the two limiting blocks 2 is relatively far, and the diameter of the limiting blocks 2 is slightly smaller than the diameter of the wax scraper 3. It can play a straightening role during the operation of the rod. The structure is similar to a fixed straightener, which plays a role in straightening and scraping wax. It has a wide range of uses and high application value.

[0056] The position of the limiting block 2 is adjustable, which allows for adjustment of the spacing between adjacent limiting blocks 2 according to different usage scenarios and lifting strokes, thereby adjusting the movement stroke of the wax scraper 3 and expanding its application range.

[0057] It can increase the service life of the rod and greatly reduce maintenance costs. Its extremely high tensile strength can fundamentally solve the problem that the tensile strength of ordinary sucker rods in special oil wells does not meet the requirements. The surface is specially treated and has extremely strong corrosion resistance. It can be widely used in multi-wax oil wells and has a low cost, so there is great potential for its promotion. It is suitable for sucker rod matching systems in deviated wells, deep wells and other similar applications.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An injection-molded straightening block surface-coated anti-corrosion sucker rod, characterized in that: The device includes a sucker rod body (1), on which several limiting blocks (2) are fixed along the axial direction. A wax scraper (3) is provided in the area between adjacent limiting blocks (2) of the sucker rod body (1) along the axial direction. The wax scraper (3) is also rotatably arranged in the circumferential direction. The axial position of the limiting blocks (2) on the sucker rod body (1) is adjusted by an adjustment structure.

2. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 1, characterized in that: The limiting block (2) includes two limiting sleeves (4) arranged in a semi-circular joint, and the mating surfaces of the two limiting sleeves (4) are detachably connected by the adjustment structure.

3. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 2, characterized in that: The adjustment structure includes two stepped holes (5) arranged side by side from top to bottom on the outer wall of each of the limiting sleeves (4). The mating surface of the limiting sleeve (4) is provided with a threaded groove (7) corresponding to the stepped hole (5). A bolt (6) is inserted into the stepped hole (5), and the end of the bolt (6) is threadedly connected to the threaded groove (7).

4. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 3, characterized in that: Each of the limiting sleeves (4) has an arc-shaped pressure plate (8) that slides radially on its inner wall, and the arc-shaped pressure plate (8) abuts against the outer wall of the sucker rod body (1).

5. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 4, characterized in that: The arc-shaped pressure plate (8) has several stop protrusions (9) evenly distributed on the side wall facing the sucker rod body (1).

6. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 5, characterized in that: The inner wall of the limiting sleeve (4) is provided with a sliding groove (10) that matches the arc-shaped pressure plate (8), and the arc-shaped pressure plate (8) is slidably installed in the sliding groove (10); the sliding groove (10) is provided with guide grooves arranged horizontally from top to bottom, and the back of the arc-shaped pressure plate (8) is fixedly connected with a guide post (11) that is slidably inserted into the guide groove.

7. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 6, characterized in that: The arc-shaped pressure plate (8) is horizontally fixed to the back of the two guide posts (11) with a screw (12). The limiting sleeve (4) has a through hole to avoid the screw (12). The other end of the screw (12) passes through the through hole and is threaded with two locking nuts (14).

8. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 7, characterized in that: The outer wall of the limiting sleeve (4) is provided with a hidden groove (13) that communicates with the through hole. The other end of the screw (12) is located in the hidden groove (13), and the locking nut (14) near the arc-shaped pressure plate (8) abuts against the bottom of the hidden groove (13).

9. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 8, characterized in that: The upper and lower ends of the sucker rod body (1) are respectively provided with threaded connectors (15), and the threaded connectors (15) of adjacent sucker rods are connected by connecting clamps (16).

10. The anti-corrosion sucker rod with organic coating on the surface of the injection-molded straightening block according to claim 9, characterized in that: The surface of the sucker rod body is sequentially coated with a thermosetting primer coating and a modified epoxy resin layer.

Images