Anti-eccentric-wear sucker rod coupling

Abstract

An anti-eccentric-wear sucker rod coupling relates to the technical field of sucker rod couplings and comprises a coupling body, a plurality of rollers with horizontal rotating axes are arranged on the coupling body and on the outer wall of the coupling body, the rollers are detachably arranged through mounting structures, and a plurality of wear indication mark rings are arranged on the side walls of the rollers in parallel. The sucker rod coupling solves the problems that in the prior art, the contact area between the sucker rod coupling and an oil pipe is too large, and consequently the overflowing area is affected; and the problems that after an existing coupling is abraded, the abrasion condition is not easy to judge, the whole coupling needs to be replaced, and the production cost is increased are solved.

Description

Technical Field

[0001] This utility model relates to the field of sucker rod coupling technology, specifically to a sucker rod coupling for preventing uneven wear. Background Art

[0002] In oilfield rod-plunger pump production systems, the sucker rod string is a slender rod consisting of several sucker rods connected by couplings. It is a key component used to connect the oil pump and the pumping unit to transmit power. However, due to the influence of well deviation and highly corrosive produced fluids, the problem of uneven wear and corrosion of the sucker rod is common. The wear of the sucker rod is mainly due to the wear of the couplings. Statistics on the wear parts of the sucker rod show that uneven wear of the sucker rod couplings is the main cause of sucker rod string breakage.

[0003] The prior art discloses a patent CN217327219U, which includes a sucker rod coupling body. A fixing mechanism is sleeved on the top of the sucker rod coupling body, and a limiting mechanism is sleeved on the bottom of the sucker rod coupling body. A rotating body is provided between the fixing mechanism and the limiting mechanism, and multiple sets of first mounting components are provided on the outside of the rotating body.

[0004] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects:

[0005] First, the existing contact area between the sucker rod coupling and the tubing is too large, which affects the flow area.

[0006] Secondly, it is difficult to determine the wear condition of existing couplings after they are worn, and the entire coupling needs to be replaced, which increases production costs.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the shortcomings of the existing technology, this utility model solves the problems of excessive contact area between the sucker rod coupling and the tubing in the traditional technology, which affects the flow area; and the difficulty in judging the wear of the coupling after it is worn, and the need to replace the entire coupling, which increases the production cost.

[0009] To solve the above problems, this utility model provides the following technical solution:

[0010] Anti-wear sucker rod coupling includes a coupling body. On the outer wall of the coupling body, a plurality of rollers with horizontally arranged rotation axes are provided. The rollers are detachably mounted using an installation structure. A plurality of wear indicator rings are arranged side by side on the side wall of the rollers.

[0011] As an optimized solution, the axial section of the coupling body is triangular, and a flow channel is formed between the coupling body and the oil pipe through the three side walls of the coupling body.

[0012] As an optimized solution, three rollers are evenly arranged around the joint body and are respectively connected to the three corners of the joint body.

[0013] As an optimized solution, the mounting structure includes mounting holes formed on the coupling body for each roller, and the rollers are rotatably mounted in the mounting holes using pins.

[0014] As an optimized solution, the mounting hole penetrates the inner hole of the coupling body, and part of the roller wall is located inside the inner hole of the coupling body.

[0015] As an optimized solution, a pin hole is provided on the side wall of the coupling body, which penetrates the mounting hole, and both ends of the pin are inserted into the pin hole.

[0016] As an optimized solution, the roller axis is located at the midpoint of the mounting hole in the radial direction.

[0017] As an optimized solution, the inner holes at both ends of the coupling are respectively provided with internal threads.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The coupling is designed and machined with three rollers distributed at 120°, which have a 360-degree load-bearing capacity. This can reduce the radial stress caused by factors such as dogleg and well inclination, while also reducing the friction between the sucker rod string and tubing, reducing the resistance during the pump stroke, and effectively resolving problems such as rod and tubing wear and sucker rod failure.

[0020] The roller support also reduces the rod's stretch, lowers the energy consumption during the up and down strokes in the oil extraction process, and improves the pump's oil extraction efficiency.

[0021] The rollers are equipped with wear indicator marks, which can be used to estimate the area of ​​most severe wear based on the degree of wear.

[0022] Installing rollers with pins makes it easy to replace severely worn rollers, reducing production costs;

[0023] The axial section of the coupling body is triangular, and a flow channel is formed between the coupling body and the oil pipe through the three side walls of the coupling body, thereby increasing the flow area. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the pin hole structure of this utility model.

[0027] In the diagram: 1-Coupling body; 2-Roller; 3-Wear indicator ring; 4-Mounting hole; 5-Internal thread; 6-Pin; 7-Pin hole. Detailed Implementation

[0028] 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.

[0029] like Figure 1 and Figure 2 As shown, the anti-wear sucker rod coupling includes a coupling body 1. Several rollers 2 with horizontally arranged rotation axes are arranged around the outer wall of the coupling body 1. The rollers 2 are detachably installed using an installation structure. Several wear indicator rings 3 are arranged side by side on the side wall of the rollers 2.

[0030] The axial section of the coupling body 1 is triangular, and a flow channel is formed between the coupling body 1 and the oil pipe through the three side walls of the coupling body 1.

[0031] Three rollers 2 are evenly arranged around the joint and are respectively connected to the three corners of the coupling body 1.

[0032] The mounting structure includes mounting holes 4 on the coupling body 1 corresponding to each roller 2, and the roller 2 is rotatably mounted in the mounting holes 4 by means of a pin 6.

[0033] Mounting hole 4 penetrates the inner hole of coupling body 1, and part of the wheel wall of roller 2 is located inside the inner hole of coupling body 1.

[0034] The side wall of the coupling body 1 is provided with a pin hole 7 through the mounting hole 4, and both ends of the pin shaft 6 are inserted into the pin hole 7.

[0035] The axis of roller 2 is located at the center of the mounting hole 4 in the radial direction.

[0036] The inner holes at both ends of the coupling are respectively provided with internal threads 5.

[0037] The working principle of this device is as follows:

[0038] The coupling is designed and machined with three rollers 2 distributed at 120°, which have a 360-degree load-bearing capacity. This can reduce the radial stress caused by factors such as dogleg and well inclination, while also reducing the friction between the sucker rod string and tubing, reducing the resistance during the pump stroke, and effectively resolving problems such as rod and tubing wear and sucker rod failure.

[0039] The support of roller 2 also reduces the amount of rod stretching, reduces energy consumption during the up and down strokes in the oil extraction process, and improves the oil extraction efficiency of the pump.

[0040] The roller 2 is equipped with wear indicator marks, which can be used to estimate the area of ​​most severe wear based on the degree of wear;

[0041] The roller 2 is installed by the pin 6, which makes it easy to replace the severely worn roller 2 and reduce production costs;

[0042] The axial section of the coupling body 1 is triangular, and a flow passage is formed between the coupling body 1 and the oil pipe through the three side walls of the coupling body 1, thereby increasing the flow area.

[0043] 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. Anti-wear sucker rod coupling, characterized in that: Includes a coupling body (1), on which a plurality of rollers (2) with horizontally arranged rotation axes are provided on the outer wall of the coupling body (1), the rollers (2) are detachably provided by the mounting structure, and a plurality of wear indicator rings (3) are arranged side by side on the side wall of the rollers (2).

2. The anti-wear sucker rod coupling according to claim 1, characterized in that: The axial section of the coupling body (1) is triangular, and a flow passage is formed between the coupling body (1) and the oil pipe through the three side walls of the coupling body (1).

3. The anti-wear sucker rod coupling according to claim 1, characterized in that: The rollers (2) are evenly arranged in three places and are respectively connected to the three corners of the coupling body (1).

4. The anti-wear sucker rod coupling according to claim 1, characterized in that: The mounting structure includes mounting holes (4) on the coupling body (1) corresponding to each roller (2), and the roller (2) is rotatably mounted in the mounting holes (4) by means of a pin (6).

5. The anti-wear sucker rod coupling according to claim 4, characterized in that: The mounting hole (4) penetrates the inner hole of the coupling body (1), and part of the wheel wall of the roller (2) is located inside the inner hole of the coupling body (1).

6. The anti-wear sucker rod coupling according to claim 4, characterized in that: The side wall of the coupling body (1) is provided with a pin hole (7) that passes through the mounting hole (4), and both ends of the pin (6) are inserted into the pin hole (7).

7. The anti-wear sucker rod coupling according to claim 4, characterized in that: The axis of the roller (2) is located at the midpoint of the mounting hole (4) in the radial direction.

8. The anti-wear sucker rod coupling according to claim 1, characterized in that: The inner holes at the upper and lower ends of the coupling are respectively provided with internal threads (5).

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