Anti-torque sucker rod with rotatable centralizer
By adding a flexible stabilizer to the sucker rod and improving the threaded connection, the problems of uneven wear and uncoupling torque of the sucker rod were solved, thereby improving the anti-torsion performance of the sucker rod and extending the service life of the equipment.
Patent Information
- Application Number
- CN202520437706.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-03-13
AI Technical Summary
Existing sucker rods are prone to uneven wear inside the tubing, leading to breakage or tubing cracking. Furthermore, the uncoupling torque is difficult to overcome, resulting in frequent disconnections, which affects production efficiency and equipment lifespan.
Design an anti-torsion sucker rod with a rotatable centralizer. The design employs a flexible centralizer body and a trapezoidal threaded connection to reduce friction between the sucker rod and tubing, prevent uneven wear, and improve anti-torsion performance through an improved threaded connection structure.
It effectively prevents uneven wear of sucker rods, extends equipment life, reduces stress concentration, improves production efficiency and economic benefits, and enhances the strength of threaded connections.
Smart Images
Figure CN223754036U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a torsion-resistant sucker rod with rotatable centralizer, belonging to the technical field of oil pumping equipment. BACKGROUND
[0002] In oil exploitation, sucker rod pumps are widely used due to their simple equipment, low investment, convenient management and strong adaptability, while the quality of the sucker rod directly affects the production efficiency.
[0003] In addition, most of the currently used sucker rods are connected by UNR-UN threads to transmit torque, and the sucker rod itself cannot overcome the unloading torque, resulting in frequent unloading and even damage to the up-and-down reciprocating oil production system. SUMMARY
[0004] The utility model provides a torsion-resistant sucker rod with rotatable centralizer to solve the above problems, which is simple in structure, easy to install and use, low in production cost, and can greatly reduce the direct friction between the sucker rod and the oil pipe, prevent the sucker rod from eccentric wear, and effectively overcome the unloading torque to reduce stress concentration.
[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a torsion-resistant sucker rod with rotatable centralizer, comprising a sucker rod, a fixed device provided on the sucker rod, a centralizer body sleeved on the fixed device, the centralizer body being rotatably connected with the fixed device, a plurality of bosses being uniformly arranged on the outer circumference of the centralizer body, and a flow groove being arranged between adjacent two bosses.
[0006] As a further improvement of the above technical scheme:
[0007] The centralizer body is provided with a first notch arranged obliquely at the middle position, and the width of the first notch is the same as the diameter of the connecting part.
[0008] The first notch divides the centralizer body into two parts, and the two parts are respectively provided with a second notch, and the second notches of the two parts are symmetrically arranged along the center of the centralizer body.
[0009] The first notch and the two second notches form a "N" shape.
[0010] The fixed device comprises a first fixed head and a second fixed head, a connecting part is connected between the first fixed head and the second fixed head, and the centralizer body is sleeved on the connecting part.
[0011] The center of the centralizer body is provided with a through hole for accommodating the connection part, and the length of the centralizer body is less than the length of the connection part.
[0012] One end of the sucker rod is provided with a threaded connection end, and the threaded connection end adopts trapezoidal thread.
[0013] The angle of the main engagement surface of the trapezoidal thread is a, and a is 7°.
[0014] The angle of the secondary engagement surface of the trapezoidal thread is b, and b is 20°.
[0015] The pitch of the trapezoidal thread is 2.54mm.
[0016] The utility model discloses the above technical scheme, has the following advantages: the utility model has the advantages of reasonable structure design, strong protection effect, high strength, small friction, protecting oil pipe, prolonging service life, improving economic benefit, thereby effectively solve the problems and the insufficient of prior art, and the improvement of threaded connection effectively reduces stress concentration and increases the torsional resistance of the sucker rod.
[0017] The utility model will be further described below in combination with the drawings and examples. DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the structure schematic diagram of the anti-torsion sucker rod with rotatable centralizer in the utility model embodiment;
[0019] Figure 2 It is the structure schematic diagram of the fixed device in the utility model embodiment;
[0020] Figure 3 It is the three-dimensional structure schematic diagram of the centralizer body in the utility model embodiment;
[0021] Figure 4 It is Figure 1 The sectional view of A-A direction in it;
[0022] Figure 5 It is Figure 1 The local enlarged view of B part in it.
[0023] In the drawing,
[0024] 1-fixed device, 2-centralizer body, 3-sucker rod, 4-threaded connection end, 5-first fixed head, 6-second fixed head, 7-connection part, 8-convex platform, 9-flow groove, 10-first gap, 11-second gap, 12-through hole. DETAILED DESCRIPTION
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.
[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Example
[0028] like Figures 1-5 As shown, an anti-torsion sucker rod with a rotatable centralizer includes a sucker rod 3, a retainer 1 on the sucker rod 3, and a centralizer body 2 sleeved on the retainer 1. The centralizer body 2 and the retainer 1 are rotatably connected. The retainer 1 includes a first retaining head 5 and a second retaining head 6, with a connecting part 7 connecting the first retaining head 5 and the second retaining head 6. The centralizer body 2 is fitted onto the connecting part 7. The centralizer body 2 has a through hole 12 at its center, which can accommodate the connecting part 7. The diameter of the through hole 12 is slightly larger than the diameter of the connecting part 7 to ensure that the centralizer body 2 can rotate. The length of the centralizer body 2 is less than the length of the connecting part 7 to ensure that the centralizer body 2 can move. The centralizer body 2 can be injection molded as a single unit.
[0029] The outer circumference of the centralizer body 2 is uniformly provided with a plurality of bosses 8, and a flow channel 9 is arranged between two adjacent bosses 8, the flow channel 9 is an oil flow channel, and a first gap 10 is arranged at the middle position of the centralizer body 2 and is arranged obliquely, the width of the first gap 10 is the same as the diameter of the connecting portion 7, the first gap 10 divides the centralizer body 2 into two parts, and the two parts are respectively provided with a second gap 11, the second gaps 11 of the two parts are symmetrically arranged along the center of the centralizer body 2, and the first gap 10 and the two second gaps 11 form a 'N' shape which penetrates each other.
[0030] When the oil well works, the centralizer body 2 can rotate in the oil well, that is, the eccentric wear of the oil rod coupling and the eccentric wear of the oil rod 3 can be prevented, the eccentric wear of the centralizer body 2 can also be prevented, the oil rod can be prevented from tripping, breaking and falling off, and the oil rod can also scrape wax.
[0031] The oil rod 3 is made of special alloy steel, and one end of the oil rod 3 is provided with a threaded connection end 4, the threaded connection end 4 is connected with the coupling by using trapezoidal threads, the trapezoidal threads adopt a structure in which the angles of the trapezoidal edges are different, and the pitch is 2.54 mm, the matching form reduces the deformation of the threads and the tendency of the threads to loosen. The angle of the main matching surface of the trapezoidal threads is a, a is 7°, has a self-locking effect, improves the tightening torque value, and prevents the coupling from being reversed; the angle of the secondary matching surface is b, b is 20°, the threads adopt a structure in which the angles of the edges are different, eliminate the gap in the traditional threads, reduce the deformation of the threads, reduce the tendency of the threads to loosen, and improve stress concentration; and through finite element analysis, plastic deformation can be reduced to 0.45%, 100% stress concentration is reduced, the connection strength of the threads is improved, the service life is prolonged, and the work efficiency is improved.
[0032] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A torsionally resistant sucker rod having a spin righter, characterized by: The oil pumping rod (3) is provided with a fixer (1), the fixer (1) is fixed on the oil pumping rod (3), the fixer (1) is sleeved with a centralizer body (2), the centralizer body (2) is rotatably connected with the fixer (1), a plurality of bosses (8) are uniformly arranged on the outer circumference of the centralizer body (2), and overflow grooves (9) are arranged between adjacent two bosses (8).
2. A torsionally resistant sucker rod with a spin-up centralizer according to claim 1, characterized in that: The centralizer body (2) is provided with a first notch (10) arranged obliquely at the middle position, and the width of the first notch (10) is the same as the diameter of the connecting portion (7).
3. A torsionally resistant sucker rod with a spin-up centralizer according to claim 2, characterized in that: The first notch (10) divides the centralizer body (2) into two parts, and the two parts are respectively provided with second notches (11), and the second notches (11) of the two parts are symmetrically arranged along the center of the centralizer body (2).
4. A torsionally resistant sucker rod with a spin-up centralizer according to claim 3, characterized in that: The first notch (10) and the two second notches (11) form an "N" shape.
5. A torsionally resistant sucker rod with a spin-up centralizer according to claim 1, characterized in that: The fixer (1) comprises a first fixing head (5) and a second fixing head (6), and the first fixing head (5) and the second fixing head (6) are connected with a connecting portion (7), and the centralizer body (2) is sleeved on the connecting portion (7).
6. A torsionally resistant sucker rod having a spin-up centralizer as defined in claim 5, characterized in that: The centralizer body (2) is provided with a through hole (12) capable of accommodating the connecting portion (7) to pass through, and the length of the centralizer body (2) is less than the length of the connecting portion (7).
7. A torsionally resistant sucker rod having a spin-up centralizer as defined in claim 1, characterized in that: One end of the oil pumping rod (3) has a threaded connection end (4), and the threaded connection end (4) adopts trapezoidal thread.
8. A torsionally resistant sucker rod with a spin-up centralizer according to claim 7, characterized in that: The angle of the main matching surface of the trapezoidal thread is a, and a is 7°.
9. A torsionally resistant sucker rod with a spin-up centralizer according to claim 8, characterized in that: The angle of the secondary matching surface of the trapezoidal thread is b, and b is 20°.
10. A torsionally resistant sucker rod with a spin-up centralizer according to claim 9, characterized in that: The pitch of the trapezoidal thread is 2.54 mm.