An oil pipe scraping device

Abstract

This utility model belongs to the technical field of oil drilling and production equipment, specifically relating to a tubing scraping device. The device includes an upper connector and a scraping head, as well as a rotating mechanism connecting the upper connector and the scraping head. The rotating mechanism includes a support sleeve connected to the upper connector and a rotating body with one end anti-detached from the support sleeve and the other end connected to the scraping head. Track grooves are evenly distributed on the outer wall of the rotating body. A guide pin is provided at the end of the support sleeve away from the upper connector. The track grooves and guide pin are slidably engaged to allow the rotating body to rotate and axially displace relative to the support sleeve when the tubing scraping device is lifted or lowered. In use, by lifting or lowering the device, the track grooves of the rotating body slidably engage with the guide pin of the support sleeve. The guide pin slides along the track grooves, forcing the rotating body to rotate and generate axial displacement, thereby driving the scraping head to actively rotate and move axially. Compared with the prior art, which passively drives the scraping head through scraper friction, this effectively improves scraping quality and efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil drilling and production equipment, and specifically relates to an oil pipe scraping device. Background Technology

[0002] Water injection, as an effective extraction method, is widely used in oilfield production operations during the mid-to-late stages of development. During long-term production, scale and impurities accumulate on the inner wall of the injection tubing, reducing the flow channels and even clogging the distributor nozzles, leading to decreased injection efficiency. Simultaneously, the reduced tubing diameter prevents testing instruments from reaching the testing zones, hindering subsequent water injection development. Currently, the following solutions are commonly used to address this scaling issue: First, physical unclogging of the tubing using mechanical tools. This method is low-cost and widely used, but its success rate needs improvement. Second, chemical methods, which are costly and generate significant pollution, are less frequently used.

[0003] A downhole tubing cleaning tool, disclosed in application publication number CN108150139A on June 12, 2018, includes a variable thread connector, a weight rod, a limit cap, a mandrel, and a scraper head. By inserting the mandrel into the cavity of the scraper head, the scraper head and mandrel can rotate relative to each other and move axially. Repeatedly lifting and lowering the tool causes the spiral scraper blades of the scraper head to rotate, thus scraping the tubing wall. However, it primarily relies on the friction between the scraper blades and the tubing wall to drive the scraper head's rotation. In cases of severe scaling or blockage caused by impurities on the tubing inner wall, the friction between the scraper blades and the tubing wall alone is insufficient to effectively drive the spiral scraper blades to rotate the scraper head, resulting in the tool failing to fully utilize its scraping function. Utility Model Content

[0004] The purpose of this utility model is to provide an oil pipe scraping device to solve the problem that in the case of severe blockage caused by severe scaling or impurity accumulation on the inner wall of the oil pipe, the existing technology relies solely on the friction between the scraper blade and the oil pipe wall to drive the scraper head to rotate, which results in the pipe clearing tool not being able to fully perform its scraping function.

[0005] To achieve the above objectives, the oil pipe scraping device of this utility model adopts the following technical solution:

[0006] An oil pipe scraping device includes an upper connector and a scraping head. The oil pipe scraping device also includes a rotating mechanism connected between the upper connector and the scraping head. The rotating mechanism includes a support sleeve connected to the upper connector and a rotating body with one end anti-disengagement fitted to the support sleeve and the other end connected to the scraping head. Track grooves are evenly distributed on the outer wall of the rotating body. A guide pin is provided at the end of the support sleeve away from the upper connector. The track groove and the guide pin are slidably fitted to allow the rotating body to rotate relative to the support sleeve and move axially when the oil pipe scraping device is lifted or lowered.

[0007] Furthermore, the rotating mechanism also includes an elastic element disposed within the support sleeve and positioned between the upper connector and the rotating body along the axial direction of the support sleeve.

[0008] Furthermore, the track groove includes guide grooves with openings facing each other and staggered, and reversing grooves connecting adjacent guide grooves. Both the guide grooves and the reversing grooves are provided with guide slopes for generating torque by allowing the guide pins to slide back and forth in the track groove.

[0009] Furthermore, an annular stop shoulder is provided on the inner wall of the end of the support sleeve away from the upper connector, and a limit cap is threadedly connected to the rotating body. The annular stop shoulder and the limit cap form an anti-disengagement fit.

[0010] Furthermore, the oil pipe scraping device also includes a straightening mechanism connected between the upper connector and the rotating mechanism.

[0011] Furthermore, the straightening mechanism includes a central rod whose two ends are threadedly connected to the upper connector and the support sleeve, respectively, and a cage-shaped straightening body made of spring plates is fitted on the central rod.

[0012] Furthermore, the straightening body includes a spring plate fixing sleeve and a pressure cap threadedly connected to the spring plate fixing sleeve. The spring plate fixing sleeve has a first boss and a second boss that are axially spaced apart. The pressure cap, the first boss, the second boss and the spring plate fixing sleeve together form an end mounting space for restricting the movement of the end of the spring plate.

[0013] Furthermore, the spring sheet has a first groove at each end, and the spring sheet fixing sleeve has a second groove. The spring sheet is fitted with the first groove and the second groove to restrict the end of the spring sheet in the end installation space.

[0014] Furthermore, the central rod is detachably connected to the support sleeve via a connecting short section.

[0015] Furthermore, multiple scraping blades with the same spiral direction are evenly distributed on the outer side of the scraper head body along its circumference.

[0016] The beneficial effects of this utility model are as follows: The tubing scraping device provided by this utility model is an improvement on the existing technology. During use, by lifting or lowering the device, the track groove of the rotating body slides into the guide pin of the support sleeve. The guide pin slides along the track groove, forcing the rotating body to rotate and generating axial displacement, which drives the scraping head to actively rotate and move axially. Compared with the existing technology, which only relies on the friction between the scraping blade and the inner wall of the tubing to drive the passive rotation of the scraping head, this effectively improves scraping quality and efficiency. The sliding fit between the guide pin and the track groove also plays a guiding and limiting role, making the movement of the rotating body more stable, reducing vibration and impact caused by unstable movement, and improving the safety and reliability of scraping operations. The scraping head, driven by the rotating body, achieves a synergistic effect of rotation and axial movement, which can effectively disperse scraping resistance and avoid the scraping head being jammed due to unidirectional force. The rotating body and the support sleeve adopt an anti-detachment fit to ensure that the rotating body will not separate from the support sleeve during scraping, ensuring the overall stability and safety of the device and avoiding downhole production accidents caused by component detachment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the oil pipe scraping device of this utility model;

[0018] Figure 2 This is a schematic diagram of the rotating body structure of the rotating mechanism in the oil pipe scraping device of this utility model;

[0019] Figure 3 This is a schematic diagram of the straightening mechanism in the oil pipe scraping device of this utility model;

[0020] Figure 4 This is a schematic diagram of the central rod structure of the straightening mechanism of the oil pipe scraping device of this utility model;

[0021] Figure 5 This is a schematic diagram of the spring plate structure of the straightening mechanism of the oil pipe scraping device of this utility model;

[0022] Figure 6 This is a schematic diagram of the spring plate fixing sleeve structure of the straightening mechanism of the oil pipe scraping device of this utility model.

[0023] In the diagram: 1. Upper connector; 2. Alignment mechanism; 3. Connecting short section; 4. Rotation mechanism; 5. Scraper head;

[0024] 21. Center rod; 211. Large diameter section; 212. Small diameter section; 2121. First keyway; 22. Spring plate; 221. First groove; 23. Spring plate fixing assembly; 231. Spring plate fixing sleeve; 2311. Second keyway; 2312. Second groove; 2313. First boss; 2314. Second boss; 232. Pressure cap; 24. Spline; 41. Support sleeve; 411. Annular stop shoulder; 42. Spring; 43. Limit cap; 44. Guide pin; 45. Rotating body; 451. Guide groove; 4511. First guide slope; 452. Reversing groove; 4521. Second guide slope; 51. Scraper blade. Detailed Implementation

[0025] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0026] The oil pipe scraping device provided by this utility model has a sliding engagement between the guide pin of the support sleeve and the track groove of the rotating body. When the device is lifted or lowered, the guide pin squeezes the track groove, causing the rotating body to rotate relative to the support sleeve, thereby driving the scraping head connected to the rotating body to rotate actively, thus realizing the rotational scraping of the oil pipe.

[0027] An embodiment of the oil pipe scraping device of this utility model:

[0028] like Figure 1 As shown, the oil pipe scraping device provided by this utility model includes an upper connector 1 and a scraping head 5, and also includes a rotating mechanism 4 connected between the upper connector 1 and the scraping head 5. The rotating mechanism 4 includes a support sleeve 41 connected to the upper connector 1 and a rotating body 45 with one end anti-detached from the support sleeve 41 and the other end connected to the scraping head 5. The outer wall of the rotating body 45 is evenly distributed with track grooves. A guide pin 44 is provided at the end of the support sleeve 41 away from the upper connector 1. The track groove and the guide pin 44 are slidably engaged so that when the oil pipe scraping device is lifted or lowered, the rotating body 45 drives the scraping head 5 connected to it to rotate relative to the support sleeve 41 and move axially.

[0029] The support sleeve 41 is a hollow cylindrical sleeve. The inner wall of the end of the support sleeve 41 away from the upper connector 1 is provided with an annular stop shoulder 411, and the end near the upper connector 1 is provided with an internal thread for threaded connection with the upper connector 1. The end of the annular stop shoulder 411 away from the upper connector 1 is provided with a guide pin 44 protruding radially and axially along the support sleeve 41. In this embodiment, there are two guide pins 44, which are evenly spaced around the annular stop shoulder 411 of the support sleeve 41.

[0030] like Figure 2 As shown and referenced Figure 1The rotating body 45 is cylindrical, with external threads at both ends. One end is threaded to the scraper head 5, and the other end extends into the support sleeve 41 and engages with it to prevent detachment. Specifically, the other end of the rotating body 45 is threaded to a limit cap 43, which engages with the annular stop shoulder 411 of the support sleeve 41 to prevent the rotating body 45 from axially separating from the support sleeve 41, while allowing the rotating body 45 to rotate circumferentially relative to the support sleeve 41 and to have limited axial displacement. The engagement between the annular stop shoulder 411 of the support sleeve 41 and the limit cap 43 ensures that the rotating body 45 remains within the support sleeve 41, preventing accidents caused by accidental detachment. Simultaneously, it maintains the relative positions and connections between the components of the rotating mechanism 4, ensuring the normal and stable operation of the device.

[0031] A track groove for sliding the guide pin 44 is provided on the outer circumferential surface of the middle section of the rotating body 45. The track groove includes a guide groove 451 and a reversing groove 452 with openings facing each other and arranged alternately. The reversing groove 452 connects to adjacent guide grooves 451 and is used to switch the guide pin 44 between adjacent guide grooves 451 when the support sleeve 41 is lifted or lowered. The guide groove 451 and the reversing groove 452 are respectively provided with a first guide inclined surface 4511 and a second guide inclined surface 4521 for generating torque by reciprocating sliding of the guide pin 44 in the track groove. The guide groove 451 and the reversing groove 452 are arranged at a certain angle and staggered in the circumference of the rotating body 45. Specifically, in this embodiment, there are 4 guide grooves 451 and 452, which are evenly distributed at a 45° offset along the circumference of the rotating body 45. After the rotating mechanism 4 is connected to the upper connector 1, the reversing groove 452 is located on the side of the rotating body 45 closer to the upper connector 1. In other embodiments, the guide grooves 451 and reversing grooves 452 can be set to 6, 8, or other suitable numbers, depending on actual needs. During the lowering process, due to the device's own weight, the guide pin 44 is located at the top of the reversing groove 452. After the scraper head 5 encounters resistance, the support sleeve 41 continues to move downwards under the device's own weight or pressure, causing the guide pin 44 to cut into one of the guide grooves 451. During this process, the guide pin 44, under the action of the first guide slope 4511 of the guide groove 451, will cause the rotating body 45 to rotate by an angle. When the device is lifted, the guide pin 44, under the action of the second guide slope 4521 of the reversing groove 452, will cause the rotating body 45 to continue rotating. Rotate at an angle; repeat the lifting or lowering action, and through the cooperation of the reversing groove 452 and the guide groove 451, the guide pin 44 switches sequentially in each reversing groove 452 and guide groove 451 along the same rotation direction, avoiding the phenomenon of stopping or jamming during the movement of the rotating body 45, thereby driving the rotating body 45 to drive the scraping head 5 to rotate continuously, ensuring the continuity of the scraping operation; the rotating body 45 can continuously rotate and axially displace according to the predetermined track, driving the scraping head 5 to continuously scrape the inner wall of the oil pipe, improving the scraping efficiency.

[0032] In the above embodiments, during use, by lifting or lowering the device, the track groove of the rotating body 45 slides in conjunction with the guide pin 44 of the support sleeve 41. The guide pin 44 slides along the track groove, forcing the rotating body 45 to rotate and generate axial displacement, which drives the scraper head 5 to actively rotate and move axially. Compared with the prior art, which only relies on the friction between the scraper blade 51 and the inner wall of the tubing to drive the passive rotation of the scraper head 5, this can effectively improve the scraping quality and efficiency. The sliding fit between the guide pin 44 and the track groove also plays a guiding and limiting role, making the movement of the rotating body 45 more stable, reducing vibration and impact caused by unstable movement, and improving the safety and reliability of scraping operations. The scraper head 5 achieves a synergistic effect of rotation and axial movement under the drive of the rotating body 45, which can effectively disperse scraping resistance and avoid the scraper head 5 from being stuck due to unidirectional force. The rotating body 45 and the support sleeve 41 adopt an anti-detachment fit to ensure that the rotating body 45 will not separate from the support sleeve 41 during the scraping process, ensuring the overall stability and safety of the device and avoiding downhole production accidents caused by component detachment.

[0033] like Figure 1 As shown, in a further embodiment, the rotating mechanism 4 also includes an elastic element disposed within the support sleeve 41 and positioned between the upper connector 1 and the rotating body 45 along the axial direction of the support sleeve 41. Specifically, the elastic element is a spring 42, one end of which abuts against the lower end face of the upper connector 1, and the other end of which abuts against the upper end face of the limiting cap 43 of the rotating body 45. Of course, the spring 42 can specifically be a tension spring, with both ends fixedly connected to the lower end face of the upper connector 1 and the upper end face of the limiting cap 43, respectively. After installation, the tension spring has a certain contraction force, which can keep the guide pin 44 at the top of the reversing groove 452 of the rotating body 45. In other embodiments, the elastic element can be elastic rubber.

[0034] After the lifting or lowering action is completed, the elastic element pushes the rotating body 45 to reset, so that the guide pin 44 returns to the top of the track groove, preparing for the rotation and axial displacement during the next movement (lifting or lowering), so that the scraper head 5 can maintain continuous rotation to achieve continuous scraping of the inner wall of the oil pipe; the elastic deformation ability of the elastic element causes it to compress when the rotating body 45 is subjected to axial resistance, absorbing the instantaneous impact force, avoiding excessive impact on the scraper head 5 due to scale protrusion on the inner wall of the oil pipe or excessive local resistance, thus improving the scraping quality; the elastic element is set inside the support sleeve 41, making the structure of the device more compact.

[0035] like Figure 3 As shown and referenced Figure 1 As a further embodiment, the tubing scraping device also includes a centering mechanism 2 connected between the upper connector 1 and the rotating mechanism 4. The centering mechanism 2 can ensure that the device can remain centered inside the tubing, so that the scraper head 5 can scrape the inner wall of the tubing evenly, maintain scraping uniformity, and improve scraping quality.

[0036] In this embodiment, the straightening mechanism 2 includes a central rod 21 whose two ends are threadedly connected to the upper connector 1 and the support sleeve 41, respectively, and a cage-shaped straightening body composed of spring plates 22 is fitted on the central rod 21.

[0037] like Figure 4 As shown, the center rod 21 is a stepped cylinder with a large-diameter section 211 and small-diameter sections 212 located at both ends of the large-diameter section 211. A first keyway 2121 is provided on the small-diameter section 212 extending along the axial direction of the center rod 21. A spline 24 is fixedly provided in the first keyway 2121 by welding. External threads are provided at the opposite ends of the small-diameter section 212 of the center rod 21. One end is used for threaded connection with the upper connector 1, and the other end is used for threaded connection with the support sleeve 41. A stepped surface is formed at the connection between the small-diameter section 212 and the large-diameter section 211 to limit the axial movement of the spring plate fixing assembly 23 in the center rod 21.

[0038] like Figure 5 , Figure 6 As shown and referenced Figure 2 The straightening body includes a spring sheet 22 and a spring sheet fixing assembly 23 for allowing at least one end of the spring sheet 22 to slide along the outer periphery of the central rod 21. Specifically, the two ends of the spring sheet 22 are respectively provided with first slots 221 to form "T" shaped structures at both ends of the spring sheet 22. The spring plate fixing assembly 23 includes a spring plate fixing sleeve 231 and a pressure cap 232. The inner circumferential surface of the spring plate fixing sleeve 231 is provided with a second keyway 2311. The spring plate fixing sleeve 231 slides with the spline 24 through the second keyway 2311, thereby slidably connecting the spring plate fixing sleeve 231 to the central rod 21. One end of the outer circumferential surface of the spring plate fixing sleeve 231 is provided with an external thread, and the other end is provided with a first boss 2313. A second boss 2314 is spaced axially from the first boss 2313, and the outer diameter of the second boss 2314 is smaller than the outer diameter of the first boss 2313. Second slots 2312 are evenly spaced circumferentially around the first boss 2313. In this embodiment, two spring plate fixing sleeves 231 are provided; four spring plates 22 are provided, evenly arranged circumferentially around the central rod 21; and four second slots 2312 are provided. It should be understood that the number of second slots 2312 is consistent with the number of spring plates 22. The number of spring plates 22 can be reasonably selected according to actual needs, and this embodiment does not limit this.

[0039] The pressure cap 232 is connected to the spring plate fixing sleeve 231 via the external thread. After assembly, one end face of the pressure cap 232 abuts against the inner end face of the first boss 2313. The pressure cap 232, the first boss 2313, the second boss 2314 and the spring plate fixing sleeve 231 enclose and form an end mounting space for restricting the movement of the end of the spring plate 22.

[0040] Each spring plate 22 has its two ends engaged with the second slot 2312 of the spring plate fixing sleeve 231 via the first slot 221. The two ends of the spring plate 22 are confined within the end mounting space by the engagement of the pressure cap 232 with the spring plate fixing sleeve 231, thus forming a cage-like centralizer. The centralizer is fitted onto the central rod 21 via the spring plate fixing sleeve 231. When the diameter of the inner wall of the oil pipe changes, the spring plate 22 undergoes elastic deformation, causing the spring plate fixing assembly 23 to move axially along the central rod 21. This allows the cage-like centralizer to adaptively adjust its shape according to the change in the inner diameter of the oil pipe, ensuring it remains firmly against the inner wall of the oil pipe and guaranteeing uniform scraping.

[0041] In other embodiments, one end of the spring sheet can be fixedly connected to the central rod by welding or other means, and the other end can be formed as a free end by cooperating with the spring sheet fixing assembly.

[0042] In other embodiments, the end of the spring sheet can be fixedly connected to the spring sheet retaining sleeve by bolts or other means. Accordingly, the spring sheet retaining sleeve needs to be provided with threaded connection holes that match the bolts.

[0043] In other embodiments, the straightening body of the straightening mechanism may be an elastic straightening block, such as in CN220036612U.

[0044] In a further embodiment, the straightening mechanism 2 and the rotating mechanism 4 are detachably connected via a connecting short section 3. Specifically, one end of the connecting short section 3 has an internal thread that connects to the central rod 21 of the straightening mechanism 2, and the other end has an external thread that connects to the support sleeve 41 of the rotating mechanism 4. The connecting short section 3 is threadedly connected to both the central rod 21 and the support sleeve 41. In other embodiments, the central rod 21 is fixedly connected to one end of the connecting short section 3 by welding or other means, and the other end of the connecting short section 3 is connected to the support sleeve 41 by threads or other detachable structures; or, the connecting short section 3 is connected to both the central rod 21 and the support sleeve 41 by pin connections. This detachable connection between the straightening mechanism 2 and the rotating mechanism 4 allows for the replacement of one or more components, such as the connecting short section 3, when a component is damaged, without requiring a complete replacement.

[0045] In this embodiment, the elastic element is mounted between the lower end face of the connecting section 3 and the upper end face of the limiting cap 43 of the rotating body 45.

[0046] like Figure 1As shown, in this embodiment, multiple scraping blades 51 with the same helical direction are evenly distributed along the circumference of the outer side of the scraper head 5 body. Specifically, the scraper head 5 includes a scraper head 5 body threadedly connected to the rotating body 45, and four scraping blades 51 with the same helical direction are evenly arranged along the circumference of the outer side of the scraper head 5 body; of course, the helical scraping blades 51 can be set to only one, or two, three, etc. It should be understood that the number and arrangement of the scraping blades 51 can be reasonably set according to needs, and this embodiment does not limit this. The consistent helical direction can make the scraper blades 51 generate a continuous and stable cutting force on the inner wall of the oil pipe being scraped, which helps to improve scraping efficiency and quality.

[0047] like Figure 1 As shown and referenced Figure 2 When the tubing scraping device provided by this utility model is used, it is inserted into the well via a steel wire. When it encounters resistance, the weight of the counterweight is transmitted sequentially through the upper connector 1, the central rod 21, and the support sleeve 41 to the guide pin 44, causing the guide pin 44 to slide down along the reversing groove 452 and the guide groove 451 to the bottom of the guide groove 451. During this process, since the straightening mechanism 2 and the support sleeve 41 threadedly connected to the central rod 21 of the straightening mechanism 2 do not rotate relative to the tubing, while the guide pin 44 of the support sleeve 41 slides down under force, the guide pin 44 presses against the track groove of the rotating body 45, causing the rotating body 45 to rotate 45° counterclockwise. The steel wire is then lifted, causing the guide pin 44 to... As the guide pin 44 moves upward along the track groove to the top of the reversing groove 452, it presses against the reversing groove 452 of the rotating body 45, causing the rotating body 45 to rotate 45° counterclockwise. The wire is then lowered again, causing the guide pin 44 to slide down the track groove to the bottom of the guide groove 451. The guide pin 44 presses against the track groove of the rotating body 45, causing the rotating body 45 to rotate 45° counterclockwise. By repeatedly lifting and lowering the wire, the rotating body 45 can achieve continuous rotation relative to the support sleeve 41, thereby driving the scraper head 5, which is threaded to it, to rotate continuously. Under the combined action of the rotational force generated by the friction between the spiral scraper blade 51 of the scraper head 5 and the inner wall of the tube, the scraping quality and effect are effectively improved.

[0048] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tubing scraping device comprising an upper coupling and a scraping head, characterized in that: The tubing scraping device also includes a rotating mechanism connected between the upper connector and the scraping head. The rotating mechanism includes a support sleeve connected to the upper connector and a rotating body with one end anti-disengagement with the support sleeve and the other end connected to the scraping head. The outer wall of the rotating body is evenly distributed with track grooves. A guide pin is provided at the end of the support sleeve away from the upper connector. The track groove and the guide pin are slidably engaged to allow the rotating body to rotate relative to the support sleeve and move axially when the tubing scraping device is lifted or lowered.

2. The oil pipe scraping device according to claim 1, characterized in that: The rotating mechanism also includes an elastic element disposed within the support sleeve and positioned between the upper connector and the rotating body along the axial direction of the support sleeve.

3. The oil pipe scraping device according to claim 1 or 2, characterized in that: The track groove includes guide grooves with openings facing each other and staggered, and reversing grooves connecting adjacent guide grooves. Both the guide grooves and the reversing grooves are provided with guide slopes for generating torque by allowing the guide pins to slide back and forth in the track groove.

4. The oil pipe scraping device according to claim 1 or 2, characterized in that: The inner wall of the support sleeve away from the upper connector is provided with an annular stop shoulder, and the rotating body is threadedly connected to a limit cap. The annular stop shoulder and the limit cap form an anti-disengagement fit.

5. The oil pipe scraping device according to claim 1 or 2, characterized in that: The tubing scraping device also includes a straightening mechanism connected between the upper connector and the rotating mechanism.

6. The tubing scraping device according to claim 5, characterized in that: The straightening mechanism includes a central rod whose two ends are threadedly connected to the upper connector and the support sleeve, respectively, and a cage-shaped straightening body made of spring plates is fitted on the central rod.

7. The tubing scraping device according to claim 6, characterized in that: The straightening body includes a spring sheet fixing sleeve for allowing at least one end of the spring sheet to slide along the outer periphery of the central rod and a pressure cap threadedly connected to the spring sheet fixing sleeve. The spring sheet fixing sleeve has a first boss and a second boss arranged axially at intervals. The pressure cap, the first boss, the second boss and the spring sheet fixing sleeve together form an end mounting space for restricting the movement of the end of the spring sheet.

8. The oil pipe scraping device according to claim 7, characterized in that: The spring sheet has a first slot at each end, and the spring sheet fixing sleeve has a second slot. The spring sheet is fitted with the first slot and the second slot to restrict the end of the spring sheet to the end installation space.

9. The oil pipe scraping device according to claim 6, characterized in that: The central rod is detachably connected to the support sleeve via a connecting short section.

10. The oil pipe scraping device according to claim 1 or 2, characterized in that: The outer side of the scraper head body has multiple scraper blades with the same spiral direction evenly distributed along its circumference.

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