A kind of beam pumping unit electric heating cable anti-abrasion device

Abstract

This utility model discloses an anti-wear device for the electric heating cable of a beam pumping unit, belonging to the technical field of cable anti-wear devices. It includes: an outer clamping part, which covers and fixes the outer wall of the cable to protect it from wear; a rotating part for supporting the outer clamping part; and a support frame, to which the rotating part is rotatably connected. The beneficial effects of this utility model are: by fixing the outer clamping part at the contact point between the cable and the pumping unit support, direct contact between the pumping unit support and the outer wall of the cable is avoided, reducing cable damage and extending service life.

Description

Technical Field

[0001] This utility model relates to an anti-wear device for the electric heating cable of a beam pumping unit, belonging to the technical field of cable anti-wear devices. Background Technology

[0002] In the extraction of heavy and extra-heavy oil, the application of medium-frequency heating technology (heating the oil reservoir through electromagnetic induction) has significant advantages. High efficiency and energy utilization: On the one hand, it directly acts on the oil reservoir through electromagnetic induction, reducing heat transfer losses, achieving a thermal efficiency of 60%-80%, significantly higher than traditional methods such as steam drive; on the other hand, it heats up quickly, rapidly reducing crude oil viscosity and improving fluidity. Environmental friendliness: On the one hand, compared to steam drive, it does not consume large amounts of water resources, reducing wastewater treatment pressure; on the other hand, there is no combustion process, avoiding greenhouse gas (such as CO2) and sulfide emissions, meeting low-carbon requirements. Flexibility and adaptability: It can be adapted to different reservoir conditions (such as thin layers, dispersed blocks, or low-pressure reservoirs) by adjusting frequency and power, and is suitable for formations where steam drive is difficult to implement (such as shallow, low-permeability layers). Automation and safety: It supports remote monitoring and intelligent control, reducing the risk of manual operation, suitable for remote or harsh environments, with minimal physical disturbance, reducing the risk of formation structural damage (such as pore collapse). Long-term economic potential: Operating costs may be lower than continuous steam injection. Scenario suitability: Prioritized for shallow to medium-depth (<800 meters) reservoirs with good electrical conductivity, or as a supplementary technology to steam drive (e.g., preheating the formation).

[0003] In daily production, the medium-frequency electric heating cable rubs against the support twice after each stroke of the beam pumping unit. Because the cable is heavy, the friction is large, and the cable rubs against the support about 3 million times a year. This friction first damages the PVC outer sheath insulation layer of the cable. With the accumulation of operating time, it gradually erodes the inner cross-linked polyethylene insulation layer, eventually exposing the neutral and live conductors. When the exposed live conductors come into contact with the metal support or the pumping unit body, an arc discharge phenomenon will occur. The pumping unit body becomes energized, causing intermittent short circuits and sparks. In severe cases, it can cause electrical fires, leading to failure of the medium-frequency electric heating equipment. This failure not only causes equipment shutdown and affects oil production efficiency, but also poses a safety risk of high-temperature erosion of the support steel structure, resulting in problems such as the neutral and live wires of the medium-frequency electric heating cable wearing off, sparking, short circuits, and breakage. The same problem occurs at the pumping unit's head. These problems not only pose a risk of electric shock but can also lead to issues such as stuck wells, oil-laden wellhead packing, increased return oil pressure, increased pumping unit load, motor burnout, and belt burnout, posing significant safety and environmental risks and impacting oil well production. However, due to the site and equipment limitations at the oil production site (cables cannot be routed elsewhere, affecting daily production safety), these problems persist. Although anti-friction materials have been added to the friction points on the medium-frequency electric heating cables, the effect is unsatisfactory. Due to gravity, the cable tends to pull from the front to the back, causing the front section to become taut, which can easily lead to cable breakage or short circuits.

[0004] To address the problem of cable wear, relevant patents have provided specific technical solutions.

[0005] Chinese invention patent application CN117293747A discloses a cable anti-wear device that uses a spring to buffer and reset, preventing excessive cable swing and thus avoiding friction between the cable's periphery and the fixing device, which would lead to cable wear. However, this solution only reduces the cable's swing amplitude; the relative movement between the cable and the fixing device still exists, meaning friction still occurs and cable wear remains. Therefore, the cable wear problem is not effectively solved.

[0006] Chinese invention patent application CN118039232A discloses a cable wear-resistant protection structure. When the cable shakes, the spring is compressed to buffer the impact force, preventing the cable from hitting the fixing pipe with excessive force and reducing the degree of cable wear. This patent application is similar to Chinese invention patent application CN117293747A in that it also uses a spring to reduce wear, but the drawback is that it cannot effectively solve the problem of cable wear. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an anti-wear device for the electric heating cable of a beam pumping unit, which changes the sliding friction of the cable to rolling friction, effectively reducing cable wear and extending the cable service life.

[0008] The technical solution of this utility model is: a wear-resistant device for the electric heating cable of a beam pumping unit, comprising:

[0009] The outer clamping part covers and fixes the cable to the outer wall to protect the cable from abrasion;

[0010] Rotating component, used to support the outer locking part;

[0011] The support frame is rotatably connected to the rotating parts.

[0012] The outer locking part includes an upper locking part and a lower locking part that cooperate with each other.

[0013] The upper and lower locking parts are fixed to the outer wall of the cable by fastening bolts at both ends.

[0014] The upper engaging part includes an upper arc-shaped engaging surface, and the two ends of the upper arc-shaped engaging surface are connected to an upper fixed plane.

[0015] The lower engaging portion includes a lower arc-shaped engaging surface, and the two ends of the lower arc-shaped engaging surface are connected to the lower fixed plane.

[0016] The arc-shaped opening of the upper arc-shaped engagement surface is directly opposite the arc-shaped opening of the lower arc-shaped engagement surface.

[0017] The arc-shaped openings of the upper and lower arc-shaped engagement surfaces are consistent with the arc of the cable's outer wall.

[0018] The fastening bolts pass through the upper and lower fixing planes, connecting and fixing the upper and lower locking parts to the outer wall of the cable.

[0019] The rotating component is a rotating roller.

[0020] The rotating roller is rotatably connected to the support frames at both ends via a rotating shaft, and the support frames are fixed on the crossbeam of the pumping unit bracket.

[0021] The beneficial effects of this utility model are:

[0022] (1) A fixed outer clamp is installed at the contact position between the cable and the pumping unit bracket to avoid direct contact between the pumping unit bracket and the outer wall of the cable, reduce cable damage, and extend service life.

[0023] (2) A rotating roller is installed on the pumping unit support. The rotating roller contacts the outer clamping part, thereby changing the sliding friction into rolling friction, which greatly reduces the friction force and thus reduces the damage caused by friction.

[0024] (3) Fix the other end of the cable to the donkey head to prevent relative sliding between the two, thereby avoiding friction damage. Attached Figure Description

[0025] Figure 1 This is the main view of the application of this utility model;

[0026] Figure 2 This is a side view showing the application of this utility model;

[0027] Figure 3 A schematic diagram of the beam pumping unit for applying this utility model.

[0028] The attached figures are labeled as follows:

[0029] 1. Cable; 2. Upper locking part; 2.1. Upper arc-shaped locking surface; 2.2. Upper fixing plane; 3. Lower locking part; 3.1. Lower arc-shaped locking surface; 3.2. Lower fixing plane; 4. Fastening bolt; 5. Rotating roller; 6. Rotating shaft; 7. Support frame; 8. Pumping unit bracket; 9. Crossbeam; 10. Donkey head. Detailed Implementation

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings: This application will be further described and explained using this example.

[0035] Example 1

[0036] A wear-resistant device for the electric heating cable of a beam pumping unit includes:

[0037] The outer locking part includes an upper locking part 2 and a lower locking part 3. The upper locking part 2 and the lower locking part 3 cooperate with each other to cover and fix the cable 1 on the outer wall to protect the cable from wear.

[0038] The upper engaging portion 2 includes an upper arc-shaped engaging surface 2.1, with both ends of the upper arc-shaped engaging surface 2.1 connected to an upper fixing plane 2.2. The arc-shaped openings of the upper arc-shaped engaging surface 2.1 and the lower arc-shaped engaging surface 3.1 have the same curvature as the outer wall of the cable, and the arc-shaped openings of the upper arc-shaped engaging surface 2.1 and the lower arc-shaped engaging surface 3.1 are vertically aligned to ensure a secure engagement on the outer wall of the cable 1. The lower engaging portion 3 includes a lower arc-shaped engaging surface 3.1, with both ends of the lower arc-shaped engaging surface 3.1 connected to a lower fixing plane 3.2. Fastening bolts 4 pass through the upper fixing plane 2.2 and the lower fixing plane 3.2 to connect and fix the upper engaging portion 2 and the lower engaging portion 3 to the outer wall of the cable 1.

[0039] The rotating roller 5 is used to support the outer clamping part; the rotating roller 5 is rotatably connected to the support frame 7 at both ends through the rotating shaft 6, and the support frame 7 is fixed on the crossbeam 9 of the pumping unit bracket 8.

[0040] Cable 1 is fixedly connected to the walking beam pumping unit's head 10, and the two will not move relative to each other to avoid friction damage to cable 1. The fixed end of cable 1 and the head 10 moves synchronously with the head 10. Driven by the head 10, the other end of cable 1 moves on the rotating roller 5. The rotating roller rotates under the action of friction. The rolling friction is much less than the traditional sliding friction, thereby reducing damage to cable 1. In addition, an outer clamping part is wrapped around the outer wall of cable 1 to protect the cable and reduce rolling friction damage to cable 1.

[0041] Example 2

[0042] In June 2024, this utility model was installed in an oil production area, and so far no medium frequency cable breakage has occurred.

[0043] The highest point of the walking beam pumping unit in this well is nearly 8 meters above the ground, and the lowest point is about 2 meters above the ground. This device is installed on the crossbeam 9 about 3 meters above the ground on the pumping unit support 8. The horizontal distance from this position to the wellhead is about 4 meters. The cable length from the top of the sucker rod to the point where this device is installed on the pumping unit is designed to ensure that the cable has appropriate tension to avoid excessive wear or premature failure due to excessive tension caused by short length. Since its installation, it has undergone more than 1.2 million strokes of friction without any wear on the cable sheath.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A wear-resistant device for electric heating cables, characterized in that, include: The outer clamping part is wrapped and fixed to the outer wall of the cable (1) to protect the cable from abrasion; Rotating component, used to support the outer locking part; The support frame (7) is rotatably connected to the rotating component.

2. The anti-wear device for electric heating cables according to claim 1, characterized in that, The outer locking part includes an upper locking part (2) and a lower locking part (3) that cooperate with each other.

3. The anti-wear device for electric heating cables according to claim 2, characterized in that, The upper engaging part (2) and the lower engaging part (3) are connected and fixed to the outer wall of the cable (1) by fastening bolts (4) at both ends.

4. The anti-wear device for electric heating cables according to claim 2, characterized in that, The upper engaging part (2) includes an upper arc-shaped engaging surface (2.1), and the two ends of the upper arc-shaped engaging surface (2.1) are connected to the upper fixed plane (2.2).

5. The anti-wear device for electric heating cables according to claim 4, characterized in that, The lower engaging part (3) includes a lower arc-shaped engaging surface (3.1), and the two ends of the lower arc-shaped engaging surface (3.1) are connected to the lower fixed plane (3.2).

6. The anti-wear device for electric heating cables according to claim 5, characterized in that, The arc-shaped opening of the upper arc-shaped engagement surface (2.1) is directly opposite the arc-shaped opening of the lower arc-shaped engagement surface (3.1).

7. The anti-wear device for electric heating cables according to claim 5, characterized in that, The arc-shaped opening curvature of the upper arc-shaped engagement surface (2.1) and the lower arc-shaped engagement surface (3.1) is consistent with the curvature of the outer wall of the cable.

8. The anti-wear device for electric heating cables according to claim 5, characterized in that, The fastening bolt (4) passes through the upper fixing plane (2.2) and the lower fixing plane (3.2) to connect and fix the upper engaging part (2) and the lower engaging part (3) to the outer wall of the cable (1).

9. The anti-wear device for electric heating cables according to claim 1, characterized in that, The rotating component is a rotating roller (5).

10. The anti-wear device for electric heating cables according to claim 9, characterized in that, The rotating roller (5) is rotatably connected to the support frames (7) at both ends via a rotating shaft (6), and the support frames (7) are fixed on the crossbeam (9) of the pumping unit bracket (8).

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