Centralizer for preventing eccentric wear of sucker rod

Abstract

The utility model relates to the technical field of sucker rod, and relates to a righting anti-deviation wear preventing sucker rod coupling, which comprises a righting sleeve, a plurality of helically arranged flow guide ribs are arranged on the peripheral wall of the righting sleeve, and flow guide channels are formed through the areas between adjacent flow guide ribs, and installation grooves are formed on each flow guide rib in a random shape. The utility model solves the problem that the righting device in the traditional technology cannot reduce the friction between the righting sleeve and the well pipe and further aggravate the wear failure due to the small contact area between the surface of the ball and the well pipe and the increased stress as the righting device is used.

Description

Technical Field

[0001] This utility model relates to the field of sucker rod technology, specifically to a sucker rod coupling that helps to straighten and prevent wear. Background Technology

[0002] Currently used oil well sucker rod centralizers come in various types, and they generally have the following problems: the grooves of the centralizer body are mostly straight grooves, which are easily worn on one side during the up-and-down sliding friction process, resulting in uneven wear of the centralizer body; the centralizer relies solely on the wear of the body to maintain its centralizing function, and as the service life increases, the wear of the centralizer body becomes severe, resulting in a short service life and thus failing to prevent uneven wear.

[0003] The prior art discloses a patent CN205577882U, which includes a center rod with threads at both ends. A centering sleeve is fitted on the center rod, and several grooves are provided on the outer surface of the centering sleeve. The grooves are spirally distributed, and several pairs of balls are provided in each groove. A spring washer is provided between each pair of balls to make the centering body easier to rotate and to make the centering body wear evenly.

[0004] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects: First, with use, the ball bearings of existing centralizers are prone to wear and failure, requiring replacement of the centralizer along with the ball bearings, which increases maintenance costs.

[0005] Secondly, with use, the existing ball bearing support method of the stabilizer has a small contact area between the ball bearing surface and the well casing, which increases the stress and fails to reduce the friction between the stabilizer sleeve and the well casing, thus aggravating the problem of wear and failure.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] In view of the shortcomings of the existing technology, this utility model solves the problem that in the traditional technology, as the centralizer is used, the small contact area between the ball surface and the well pipe leads to increased stress, which fails to reduce the friction between the centralizer sleeve and the well pipe, thus aggravating wear and failure.

[0008] To solve the above problems, this utility model provides the following technical solution: The anti-wear and straightening sucker rod coupling includes a straightening sleeve. The circumferential wall of the straightening sleeve has several spirally arranged guide ribs, forming a flow channel through the area between adjacent guide ribs. Each guide rib has a contoured mounting groove. Each of the mounting slots is detachably connected to a graphite block, which is slidably positioned radially along the centering sleeve via a tensioning structure.

[0009] As an optimized solution, a support plate is slidably provided in the mounting groove along the radial direction, and the graphite block is fixed on the support plate.

[0010] As an optimized solution, several compression springs are arranged side by side between the tray and the bottom of the mounting groove, with the compression springs arranged side by side along the extension direction of the mounting groove.

[0011] As an optimized solution, a positioning protrusion is fixedly connected between the back of the tray and the mounting groove for each of the compression springs, and the two ends of the compression spring are respectively inserted into the positioning protrusion.

[0012] As an optimized solution, limiting plates are detachably connected to the opposite sidewalls of the mounting groove near the groove opening, and the sliding stroke of the support plate is limited by the limiting plates.

[0013] As an optimized solution, the opposite sidewalls of the graphite block are in frictional contact with the opposite inner walls of the two limiting plates.

[0014] As an optimized solution, countersunk holes are respectively opened on the outer wall near both ends of the graphite block, and a first screw is inserted into the countersunk hole. The end of the first screw is threadedly connected to the support plate.

[0015] As an optimized solution, countersunk holes are respectively opened on the inner walls of the limiting plate near both ends, and a second screw is inserted into the countersunk hole. The end of the second screw is threaded to the side wall of the mounting groove.

[0016] As an optimized solution, the inner hole of the straightening sleeve is provided with a connecting thread.

[0017] Compared with the prior art, the beneficial effects of this utility model are: By placing graphite blocks in the installation groove, the outer wall of the graphite contacts the inner wall of the well pipe, and friction is applied to increase the support area and improve the straightening effect. As the outer wall of the graphite block wears down with use, a compression spring can be installed to compensate for the wear of the graphite block, increase the contact between the graphite block and the inner wall of the well casing, and improve the straightening effect. Furthermore, the self-lubricating properties of graphite blocks can reduce friction and decrease wear caused by sucker rod bending, making them suitable for scenarios prone to wear and wax buildup, such as deviated wells, directional wells, and high-wax oil wells. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model.

[0020] In the diagram: 1-Straightening sleeve; 2-Guide rib; 3-Guide channel; 4-Graphite block; 5-First screw; 6-Mounting groove; 7-Limiting plate; 8-Second screw; 9-Support plate; 10-Compression spring; 11-Positioning protrusion. Detailed Implementation

[0021] 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.

[0022] like Figure 1 and Figure 2 As shown, the anti-wear and straightening sucker rod coupling includes a straightening sleeve 1. The peripheral wall of the straightening sleeve 1 is provided with several spirally arranged guide ribs 2, forming a guide channel 3 through the area between adjacent guide ribs 2. Each guide rib 2 has a contoured mounting groove 6. Each mounting slot 6 is detachably connected to a graphite block 4, which is slidably set along the radial direction of the straightening sleeve 1 by a tensioning structure.

[0023] A support plate 9 is provided radially inside the mounting groove 6, and the graphite block 4 is fixed on the support plate 9.

[0024] Several compression springs 10 are arranged side by side between the bottom of the support plate 9 and the mounting groove 6, and the compression springs 10 are arranged side by side along the extension direction of the mounting groove 6.

[0025] A positioning protrusion 11 is fixedly connected to each compression spring 10 between the back of the tray 9 and the mounting groove 6, and the two ends of the compression spring 10 are respectively inserted into the positioning protrusion 11.

[0026] The bottom of the mounting slot has a reduced diameter section, and the compression spring is located inside the reduced diameter section.

[0027] Limiting plates 7 are detachably connected to the opposite side walls of the mounting groove 6 near the groove opening, and the sliding stroke of the support plate 9 is limited by the limiting plates 7. The support plate 9 and the compression spring 10 can be installed by removing the limiting plates 7.

[0028] The opposite sidewalls of graphite block 4 are in frictional contact with the opposite inner walls of the two limiting plates 7.

[0029] The graphite block 4 has countersunk holes on its outer walls near both ends. A first screw 5 is inserted into the countersunk hole, and the end of the first screw 5 is threaded to the support plate 9.

[0030] The inner walls of the limiting plate 7 near both ends are provided with countersunk holes, and the second screws 8 are inserted into the countersunk holes. The ends of the second screws 8 are threaded to the side wall of the mounting groove 6.

[0031] The inner hole of the centering sleeve 1 is provided with connecting threads for connecting the upper and lower sucker rods, ensuring compatibility with conventional sucker rod strings.

[0032] The working principle of this device is as follows: By setting graphite blocks 4 in the mounting groove 6, the outer wall of the graphite contacts the inner wall of the well pipe, and friction is applied to increase the support area and improve the straightening effect. As the outer wall of graphite block 4 wears down with use, the wear of graphite block 4 can be compensated by setting compression spring 10, which increases the contact between graphite block 4 and the inner wall of the well pipe and improves the straightening effect. Furthermore, the self-lubricating properties of graphite block 4 can reduce friction and decrease wear caused by sucker rod bending, making it suitable for scenarios prone to wear and wax buildup, such as deviated wells, directional wells, and high-wax oil wells.

[0033] 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. A straightening and anti-wear sucker rod coupling, characterized in that: The system includes a straightening sleeve (1), on which a plurality of spirally arranged guide ribs (2) are provided on the peripheral wall, and a guide channel (3) is formed through the area between adjacent guide ribs (2). Each guide rib (2) is provided with an installation groove (6). Each of the mounting slots (6) is detachably connected to a graphite block (4), which is slidably arranged radially along the straightening sleeve (1) by a tensioning structure.

2. The straightening and anti-wear sucker rod coupling according to claim 1, characterized in that: The mounting groove (6) is provided with a support plate (9) that slides radially inside, and the graphite block (4) is fixed on the support plate (9).

3. The straightening and anti-wear sucker rod coupling according to claim 2, characterized in that: Several compression springs (10) are arranged side by side between the bottom of the tray (9) and the mounting groove (6), and the compression springs (10) are arranged side by side along the extension direction of the mounting groove (6).

4. The straightening and anti-wear sucker rod coupling according to claim 3, characterized in that: The back of the tray (9) and the mounting groove (6) are respectively fixed with positioning protrusions (11) for each of the compression springs (10), and the two ends of the compression springs (10) are respectively inserted into the positioning protrusions (11).

5. The straightening and anti-wear sucker rod coupling according to claim 2, characterized in that: The mounting groove (6) is detachably connected to the opposite side wall near the groove opening by a limiting plate (7), and the sliding stroke of the support plate (9) is limited by the limiting plate (7).

6. The straightening and anti-wear sucker rod coupling according to claim 5, characterized in that: The opposite sidewalls of the graphite block (4) are in frictional contact with the opposite inner walls of the two limiting plates (7).

7. The straightening and anti-wear sucker rod coupling according to claim 2, characterized in that: The graphite block (4) has countersunk holes on its outer walls near both ends. A first screw (5) is inserted into the countersunk hole, and the end of the first screw (5) is threaded to the support plate (9).

8. The straightening and anti-wear sucker rod coupling according to claim 5, characterized in that: The limiting plate (7) has countersunk holes on its inner walls near both ends. A second screw (8) is inserted into the countersunk hole, and the end of the second screw (8) is threaded to the side wall of the mounting groove (6).

9. The straightening and anti-wear sucker rod coupling according to claim 1, characterized in that: The inner hole of the straightening sleeve (1) is provided with a connecting thread.

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