Torque sucker rod with anti-sticking end face

Abstract

An end face anti-sticking torque sucker rod comprises a rod body, rod heads, couplings, threaded portions and shoulders, the rod heads are arranged at the two ends of the rod body, the couplings are connected to the rod heads in a screwed mode, the threaded portions are arranged in the couplings, and the shoulders are arranged at the positions, close to the rod heads, of the rod body. The torque sucker rod has the advantages that adhesion abrasion of the contact surface is reduced, abrasion of the end surface is reduced, the service life of the torque sucker rod is prolonged, the reliability of rod-column connection is improved, the end surface of the external thread shoulder of the torque sucker rod is hardened, a phosphating film on the end surface of the coupling is removed, and the adhesion abrasion of the contact surface can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sucker rod, concretely is a kind of end face anti-sticking torque sucker rod. BACKGROUND

[0002] In the oilfield screw pump oil production process, many torque rods are connected into rod string by coupling to deliver torque for bottom screw pump, and different from conventional sucker rod reciprocating motion, the connecting thread of torque sucker rod needs to bear the torque of rod string all the time, when pump jamming or rod string torque suddenly increases, rod head thread and coupling will be further tightened, which is easy to cause sticking damage of the contact surface of rod head and coupling, that is, the shoulder end face of torque rod and the end face of coupling are worn, and the wear form is "sticking wear", also known as "bite wear", which is a kind of wear form that local metal sticking occurs on the contact surface of friction pair during sliding friction, and the sticking place is damaged during subsequent relative sliding, and metal chips are pulled down from the surface of part or the surface of part is scratched. After the contact surface is damaged, the continuous use of torque rod and coupling is affected, and the cost of torque sucker rod is nearly twenty times the cost of coupling.

[0003] To prevent thread sticking, the common practice is to carry out overall phosphating treatment on the coupling, which protects the thread, but the end face of the coupling reduces the friction between the shoulder end face of the torque sucker rod and the end face of the coupling due to the presence of phosphating film, and reduces the torque bearing capacity.

[0004] In view of the above status of screw pump torque rod, the utility model develops anti-end face wear torque sucker rod. The anti-end face wear torque sucker rod is based on ordinary torque rod, and the shoulder end face of rod body is subjected to hardening treatment process to increase surface hardness, so as to achieve the purpose of anti-sticking and anti-wear and improve the service life of torque sucker rod. At the same time, the phosphating film on the end face of the coupling is removed to increase the relative friction and improve the torque bearing capacity. CONTENT OF UTILITY MODEL

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an end face anti-sticking torque sucker rod, which effectively solves the problems mentioned in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: the utility model discloses a rod body, a rod head, a coupling, a threaded part and a shoulder, both ends of the rod body are provided with the rod head, the rod head is rotationally connected with the coupling, the inside of the coupling is provided with the threaded part, and the rod body is provided with the shoulder close to the position of the rod head.

[0007] Preferably, the hardness of the shoulder end face is 40HRC-45HRC.

[0008] Preferably, the hardening thickness of the shoulder end face is 1mm-2mm.

[0009] Preferably, the phosphating film of the coupling surface is removed by a lathe.

[0010] Preferably, the shoulder end face is hardened by high-frequency induction quenching, laser quenching or plasma quenching.

[0011] Beneficial effects: the utility model reduces the adhesion wear of the contact surface, reduces the end face wear, improves the service life of the torque pumping rod, improves the reliability of the rod column connection, adopts the hardening treatment of the shoulder end face of the torque pumping rod outer thread, removes the coupling end face phosphating film, and can reduce the adhesion wear of the contact surface. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model.In the drawings:

[0013] Fig. 1 It is the overall structure schematic view of the utility model;

[0014] Fig. 2 It is the shoulder end face structure schematic view of the utility model;

[0015] Reference numerals in the drawings: 1, rod body;2, rod head;3, coupling;4, threaded portion;11, shoulder end face. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings Figs. 1-2 The specific implementation of the utility model is further explained in detail.

[0017] Example one, by Figs. 1-2 The utility model provides a kind of end face anti-sticking torque pumping rod, including rod body 1, rod head 2, coupling 3, threaded portion 4 and shoulder end face 11.

[0018] The both ends of the rod body 1 are provided with rod head 2, and the rod body 1 is the main load-bearing component, has good strength and toughness, can adapt to the complex stress conditions such as stretching, torsion in the well, and ensure that no failure such as fracture occurs in long-term work.

[0019] The rod head 2 is rotationally connected with the coupling 3, and the structure shape is closely matched with the coupling 3, can be accurately docked, to ensure the initial stability of connection.

[0020] The threaded portion 4 is arranged in the coupling 3, the threaded portion is adopted with fine processing technology, and is mutually adapted with the thread of the rod head 2, has good self-locking characteristics, can still keep firm connection under the condition of bearing larger axial tension and torque, prevents loosening phenomenon in the pumping process.

[0021] The rod body 1 is provided with a shoulder end face 11 near the position of the rod head 2. The shoulder end face can effectively limit the relative displacement between the rod head 2 and the coupling 3. During the reciprocating movement of the sucker rod and the torque transmission process, it plays an important role in enhancing the stability of the connection, avoiding problems such as torque loss and loose connection caused by excessive displacement.

[0022] The hardness of the shoulder end face 11 is controlled in the range of 40HRC-45HRC. This hardness range is the optimal choice considering wear resistance and toughness. During frequent friction contact in the well, such hardness can effectively resist friction and wear, and at the same time, it will not become brittle due to excessive hardness, and it can still maintain structural integrity under long-term alternating stress, ensuring the reliability of the entire sucker rod connection part.

[0023] Hardened thickness of the shoulder end face:

[0024] The hardened thickness of the shoulder end face is set to 1mm-2mm. This thickness range can form an effective hardened protective layer in the key parts of the shoulder end face, improving its wear resistance and fatigue resistance, and will not significantly increase production costs and processing difficulty due to excessive thickening of the hardened layer, achieving a good balance between product performance and manufacturing cost.

[0025] Surface treatment of the coupling:

[0026] The phosphating film on the surface of the coupling 3 is removed by a lathe. The presence of the phosphating film reduces the friction between the torque sucker rod shoulder end face and the coupling end face, reducing the torque carrying capacity. By removing the phosphating film with a lathe, the friction between the torque sucker rod shoulder end face and the coupling end face is increased, the torque carrying capacity is improved, the oil extraction system is ensured to run smoothly in the well, and the downtime for maintenance due to sticking and other problems is reduced.

[0027] Hardening method of the shoulder end face:

[0028] The shoulder end face 11 is hardened by high-frequency induction quenching, laser quenching or plasma quenching. Compared with traditional processes, these advanced quenching processes have the advantages of fast heating speed, uniform hardness of the quenched layer, and small deformation. The shoulder end face can be hardened according to precise process requirements, ensuring that the quality of each produced sucker rod shoulder end face part has high consistency and stability, further improving the overall reliability and service life of the product.

[0029] Use process

[0030] Installation stage: In the oil extraction site, the end face anti-sticking torque sucker rod of the utility model is connected through the coupling in turn to form a sucker rod string, which is lowered into the oil well. During the connection process, the thread cleaning condition of the rod head and the coupling is checked again to ensure that there is no impurity and oil stain residue, and the tightening operation is strictly carried out according to the specified torque to ensure the reliability and stability of the entire sucker rod string connection.

[0031] Running stage: In the oil pumping operation process, the oil pumping machine drives the sucker rod to move back and forth, and the sucker rod of the utility model can effectively avoid the sticking problem of the rod head and the end face of the coupling, and ensure the stable transmission of the torque at each connection position. The shoulder end face plays a role in limiting and enhancing stability, and the threaded part remains firmly connected, so that the oil pumping system can operate efficiently and stably, reduce the number of fault shutdowns, and improve the oil extraction efficiency.

[0032] Maintenance stage: The downhole sucker rod is checked regularly, and the wear condition of the shoulder end face part is focused on. If abnormal phenomena such as peeling of the hardened layer and excessive wear are found, the corresponding sucker rod is taken out in time, and the faulty parts are replaced to prevent the fault from further expanding and affecting the normal operation of the entire oil pumping system. At the same time, when storing and transporting the standby sucker rod, it is necessary to avoid its being subjected to severe impact and extrusion to prevent the rod body from being deformed and the shoulder end face from being damaged, so as to ensure that the performance of the sucker rod is not affected.

[0033] Beneficial effects: Excellent anti-sticking performance: through the removal of the phosphating film on the surface of the coupling and the optimization design of the shoulder end face and other structures, the problem of sticking of the end face of the sucker rod is fundamentally solved, the fault shutdown time caused by sticking in the oil pumping operation is greatly reduced, and the efficiency of oil extraction is significantly improved.

[0034] Stable torque transmission: the structure design of the shoulder end face 11 and the coupling 3 and the rod head 2, together with the reasonable hardness, hardened thickness and advanced hardening process of the shoulder end face 11, ensures that the torque can be stably and efficiently transmitted at the connection position of the sucker rod, reduces energy loss, effectively prolongs the service life of the sucker rod, and reduces the equipment updating cost.

[0035] Reliable wear resistance: the shoulder end face 11 is carefully designed and hardened, which can maintain good dimensional accuracy and structural integrity during long-term friction contact with the coupling 3, reduce the frequency of maintenance and replacement due to wear, reduce maintenance cost, and improve the operation reliability of the entire oil pumping system.

[0036] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A type of end-face anti-stick torque sucker rod, comprising a rod body (1), a rod head (2), a coupling (3), a threaded portion (4), and a shoulder end face (11), characterized in that: Both ends of the rod (1) are provided with rod heads (2), and a coupling (3) is screwed onto the rod head (2). The coupling (3) has a threaded part (4) inside, and a shoulder end face (11) is provided on the rod body (1) near the rod head (2).

2. The anti-sticking torque sucker rod according to claim 1, characterized in that: The hardness of the shoulder end face (11) is between 40 HRC and 45 HRC.

3. The end-face anti-sticking torque sucker rod according to claim 2, characterized in that: The hardening thickness of the shoulder end face (11) is 1mm to 2mm.

4. The end-face anti-sticking torque sucker rod according to claim 1, characterized in that: The phosphate film on the surface of the coupling (3) is removed by a lathe.

5. The anti-sticking torque sucker rod according to claim 2, characterized in that: The shoulder end face (11) is hardened by high-frequency induction hardening, laser hardening or plasma hardening.

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