A rotating wiper assembly tool for use in a heavily waxed well

Abstract

This invention relates to the field of oilfield development technology, specifically to a rotary wax scraping assembly for wells with severe wax buildup, comprising: an installation rod, a wax scraping component, and an auxiliary scraping component. When encountering a thick, hard wax layer, the auxiliary scraping component reduces the radial dimension of the scraping end and increases the axial contact area between the scraping end and the wax layer, thereby achieving uniform segmentation and scraping of the thick wax layer, cutting it into smaller or thinner wax blocks. When encountering a thin wax layer, the auxiliary scraping component increases the radial dimension of the scraping end and reduces the axial contact area between the scraping end and the wax layer. Therefore, through this adaptive adjustment, the wax scraping component can still effectively scrape the wax layer, avoiding the accumulation of large wax debris due to excessive scraping area, and also preventing incomplete wax removal due to insufficient scraping area, thus reducing the risk of wax blockage in the oil well.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to a rotary wax scraping combination tool for use in wells with severe wax buildup. Background Technology

[0002] In other low-carbon extraction technologies such as oil and gas, during the process of crude oil being extracted from the formation to the wellhead, as temperature and pressure gradually decrease and lighter components continuously escape, paraffin wax contained in the crude oil will precipitate from the liquid state and gradually deposit on the inner wall of the tubing, forming a wax layer. Wax deposition is a common phenomenon that affects the normal production of oil wells. If it is not dealt with in a timely and effective manner, it will lead to a reduction in the effective flow area of ​​the tubing, an increase in flow resistance, and in severe cases, it may even cause complete blockage of the tubing, forcing the well to shut down and causing huge economic losses to oilfield production.

[0003] To address the problem of wax buildup in oil wells, the industry currently mainly employs two techniques: thermal wax removal and mechanical wax removal. Thermal wax removal involves injecting a high-temperature medium into the well, melting the deposited wax and expelling it with the fluid flow. This method is effective for soft wax or early-stage wax buildup, but it is energy-intensive, costly, and its melting efficiency significantly decreases for existing hard, dense wax layers. Mechanical wax removal primarily uses tools such as wax scrapers or scraper blades, lowered into the well using wire or coiled tubing as a carrier. The wax is scraped off the tubing wall through reciprocating motion, making it the most direct and effective method for treating severely waxed sections.

[0004] However, existing mechanical wax scraping tools still have significant limitations in practical applications for oil wells with severe wax buildup. In particular, the most concentrated wax buildup is usually located in the shallow region from the wellhead to 500m, especially within the 200m range. Due to drastic temperature gradient changes, wax buildup is most severe there, and the wax, after long-term deposition and compaction, often becomes hard and adheres strongly to the tubing wall. When using conventional wax scrapers to treat such sections, the upper tubing string is relatively light, unable to provide sufficient drilling pressure, making it difficult to effectively adhere to the hard, thick wax layer. The scraper can only scrape the tubing wall point by point with a fixed cutting diameter, or requires repeated lifting and lowering of the drill string to apply pressure. This method is not only inefficient but also labor-intensive. When too much or too large wax debris is scraped off in one operation, it easily accumulates above the tool or in the annulus, causing stuck pipe or blockage of the circulation channels. Even with immediate hot washing circulation, large pieces of wax are difficult to melt and remove quickly, causing pressure buildup, often requiring multiple repeated cycles, making the process cumbersome and severely hindering the progress of well workover operations. Summary of the Invention

[0005] Therefore, it is necessary to provide a rotary wax scraping combination tool for wells with severe wax buildup, addressing the problems of low wax removal efficiency and easy clogging of current wax scraping tools when dealing with wax layers of different thicknesses.

[0006] The above objectives are achieved through the following technical solutions: A rotary wax scraping assembly tool for use in wells with severe wax buildup includes: The mounting rod is rotatable about its own axis; a drill bit is coaxially connected to the end of the mounting rod, and the drill bit is used to guide the mounting rod to be lowered. A wax scraping assembly is installed on the outside of the mounting rod. The wax scraping assembly has a scraping end, which is used to scrape wax from the wax-covered well section when the mounting rod rotates around its own axis. A hollow channel is coaxially formed inside the mounting rod, containing hot oil. An oil outlet is formed at the bottom end of the mounting rod, communicating with the hollow channel. An oil outlet is formed inside the drill bit, communicating with the oil outlet and the inside of the well. The oil outlet guides the hot oil to the scraping end to melt the wax. The auxiliary scraping component can adjust the radial dimension of the scraping end when encountering wax layers of different radial thicknesses, so as to scrape off wax layers of different radial thicknesses. A rotating rod is coaxially provided at the end of the mounting rod away from the drill bit. The rotating rod is coaxially threadedly connected to the mounting rod, and the rotating rod can drive the mounting rod to rotate around its own axis. The wax scraping assembly is configured in two sets, and the two sets of wax scraping assemblies are symmetrically installed on the outside of the mounting rod; Each set of the wax scraping assembly includes multiple wax scraping blades, which are distributed along the axial direction of the mounting rod. Adjacent wax scraping blades are connected in sequence, and all wax scraping blades are slidably connected to the mounting rod. One end of the wax scraping blade near the drill bit is fixedly connected to the mounting rod, and one end of the wax scraping blade near the rotating rod is slidably connected to the mounting rod. The wax scraping blade has a scraping end that protrudes radially outward. When encountering wax layers of different radial thicknesses, the auxiliary scraping assembly can drive the radial dimensions of the multiple scraping ends to change.

[0007] Furthermore, along the travel direction of the mounting rod, the radial dimension of the scraping end gradually increases from bottom to top.

[0008] Furthermore, a limiting clamp is provided at the connection between adjacent wax scraper blades. The limiting clamp is coaxially mounted on the outside of the mounting rod and is slidably connected to the mounting rod. The limiting clamp is used to restrict the radial sliding of the wax scraper blade.

[0009] Furthermore, the auxiliary scraping assembly includes a sliding sleeve and a wax scraper. The sliding sleeve is coaxially sleeved on the outside of the rotating rod, and the sliding sleeve is slidably connected to the rotating rod. The wax scraper is coaxially fixedly connected to the sliding sleeve, and multiple scraping teeth are fixedly arranged circumferentially on the sliding sleeve, which can perform auxiliary wax scraping. The wax scraper is connected to one end of the wax scraping blade near the rotating rod.

[0010] Furthermore, the auxiliary scraping assembly also includes a compression spring, one end of which is fixedly connected to the mounting rod, and the other end of which is fixedly connected to the sliding sleeve; the elastic force of the compression spring always causes the scraper to slide away from the direction of the rotating rod.

[0011] Furthermore, the sliding sleeve is provided with multiple through-holes for draining the hot oil carrying the wax block.

[0012] Furthermore, the scraping end of the wax scraper blade is configured as an inclined surface.

[0013] The beneficial effects of this invention are: This invention provides a rotary wax scraping assembly for use in wells with severe wax buildup, comprising an installation rod, a wax scraping component, and an auxiliary scraping component. The installation rod is rotatable about its own axis, and a drill bit is coaxially connected to its end. The wax scraping component is mounted on the outside of the installation rod and has a scraping end. When the installation rod rotates about its own axis and is simultaneously lowered into the well, the wax scraping component rotates and lowers synchronously with the installation rod. The scraping end can perform circumferential scraping of the wax layer adhering to the inner wall of the well, while the drill bit can break up blockages and part of the wax layer in the well, providing guidance for the smooth passage of the installation rod and the wax scraping component and reducing the risk of stuck pipe. Furthermore, when encountering a wax layer with a large radial thickness and a hard texture, the auxiliary scraping component can reduce the radial dimension of the scraping end and increase the axial contact area between the scraping end and the wax layer, thereby achieving uniform segmentation and scraping of the thick wax layer, and cutting the wax layer into smaller or thinner wax blocks. When encountering a wax layer with a small radial thickness, the auxiliary scraping component can increase the radial dimension of the scraping end and reduce the axial contact area between the scraping end and the wax layer. Therefore, the wax scraping assembly, through this adaptive adjustment, can still effectively scrape off the wax layer, avoiding the accumulation of large wax debris due to excessive scraping area, and also preventing incomplete wax removal due to insufficient scraping area, thus reducing the risk of wax blockage in the oil well. Simultaneously, during the combined motion of the mounting rod driving the wax scraping assembly to rotate and continuously descend, the auxiliary scraping assembly can rotate synchronously with the mounting rod, further scraping off the wax layer along the axial direction of the mounting rod. Furthermore, the mounting rod has a hollow channel extending along its own axial direction inside, and multiple circumferentially distributed oil outlets at the bottom of the mounting rod, which are connected to the hollow channel; the drill bit has an oil outlet inside, which is connected to the oil outlet and the inside of the oil well. During the wax scraping process, hot oil is simultaneously injected into the hollow channel and flows into the oil well through the oil outlet and oil outlet, melting the scraped wax blocks so that the hot oil carries the melted wax blocks out. Attached Figure Description

[0014] Figure 1 An isometric side view of a rotary wax scraping assembly tool for use in wells with severe wax buildup according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 for Figure 1 The front view; Figure 4 for Figure 3 Top view; Figure 5 for Figure 4 A sectional view along section BB; Figure 6 for Figure 5 A magnified view of a portion of point D in the middle; Figure 7 for Figure 5 A magnified view of a portion of point E in the middle; Figure 8 for Figure 4 A sectional view along section CC; Figure 9 for Figure 8 A magnified view of a portion of point F in the middle; Figure 10 for Figure 1 Exploded view; Figure 11 An isometric side view of a rotary wax scraping assembly tool for use in wells with severe wax buildup, provided in another embodiment of the present invention; Figure 12 for Figure 11 A magnified view of a portion of point G in the middle.

[0015] in: 101. Mounting rod; 102. Hollow channel; 103. First limiting groove; 104. Oil outlet; 111. Rotating rod; 112. Connecting groove; 113. Second limiting groove; 121. Drill bit; 122. Oil outlet; 200. Wax scraper assembly; 201. Wax scraper blade; 202. Scraping end; 211. Limiting clamp; 300. Auxiliary scraping component; 301. Sliding sleeve; 302. Wax scraper; 303. Scraper teeth; 304. Compression spring; 311. Drain hole. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0017] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0018] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] The following reference Figures 1 to 12 This invention describes a rotary wax scraping assembly tool for use in wells with severe wax buildup. The rotary wax scraping assembly tool for wells with severe wax buildup includes an external drive mechanism, a mounting rod 101, a rotating rod 111, and a wax scraping assembly 200. The mounting rod 101 is installed vertically. The top end of the mounting rod 101 is coaxially threaded to the rotating rod 111, and the external drive mechanism can drive the rotating rod 111 to rotate around its own axial direction. The wax scraping assembly 200 is installed on the outside of the mounting rod 101 and has a scraping end 202 capable of scraping wax from the wax-covered well section. At the start of operation, the mounting rod 101, together with the wax scraping assembly 200, is lowered vertically into the oil well. During the lowering process, when the wax scraping assembly 200 encounters increased resistance from the wax layer and can no longer descend, the external drive mechanism drives the mounting rod 101 to rotate around its own axis via the rotating rod 111, which in turn drives the wax scraping assembly 200 to rotate synchronously. This allows the scraping end 202 of the wax scraping assembly 200 to perform annular scraping of the wax layer adhering to the inner wall of the oil well. Simultaneously, the mounting rod 101 continues to lower while rotating, achieving continuous wax scraping operation with the wax scraping assembly 200 rotating and feeding simultaneously. During this combined motion of the mounting rod 101 driving the wax scraping assembly 200 to rotate and continuously lower, the scraping end 202 continuously cuts the wax layer into small fragments for subsequent removal.

[0020] The bottom end of the mounting rod 101 is threaded with a drill bit 121. During the rotation and descent of the mounting rod 101, the drill bit 121 moves synchronously with the mounting rod 101, which can break the blockage in the oil well and part of the wax layer, providing guidance for the smooth passage of the mounting rod 101 and the wax scraping assembly 200, and reducing the risk of stuck drill bit.

[0021] Furthermore, the rotary wax scraping assembly used in wells with severe wax buildup also includes an auxiliary scraping component 300. When encountering a thick and hard wax layer, the auxiliary scraping component 300 can reduce the radial dimension of the scraping end 202 and increase the axial contact area between the scraping end 202 and the wax layer, thereby achieving uniform segmentation and scraping of the thick wax layer, and cutting the wax layer into smaller or thinner wax blocks. When encountering a thin wax layer, the auxiliary scraping component 300 can increase the radial dimension of the scraping end 202 and reduce the axial contact area between the scraping end 202 and the wax layer. Therefore, through this adaptive adjustment, the wax scraping component 200 can still maintain effective scraping of the wax layer, avoiding the accumulation of large wax debris due to excessive scraping area, and also preventing incomplete wax removal due to insufficient scraping area, thus reducing the risk of wax blockage in the oil well. Meanwhile, during the combined motion of the mounting rod 101 driving the wax scraping assembly 200 to rotate and continuously lower, the auxiliary scraping assembly 300 can rotate synchronously with the mounting rod 101 and further scrape off the wax layer along the axial direction of the mounting rod 101.

[0022] The mounting rod 101 has a hollow channel 102 extending axially inside, and the rotating rod 111 has a connecting groove 112 extending axially inside, which communicates with the hollow channel 102. The bottom of the mounting rod 101 has multiple circumferentially distributed oil outlet holes 104, which communicate with the hollow channel 102. The drill bit 121 has multiple circumferentially distributed oil outlets 122 inside, which communicate with the oil outlet holes 104 and the inside of the oil well. During the wax scraping process, hot oil is simultaneously injected from the connecting groove 112 into the hollow channel 102, and flows into the oil well through the oil outlet holes 104 and oil outlets 122, melting the scraped-off wax blocks so that the hot oil carries the melted wax blocks out.

[0023] In one embodiment, the wax scraping assembly 200 is configured as two sets, which are symmetrically installed on the outside of the mounting rod 101 to improve the wax scraping efficiency.

[0024] In one embodiment, each wax scraping assembly 200 includes multiple wax scraping blades 201, which are evenly distributed along the axial direction of the mounting rod 101. Adjacent wax scraping blades 201 are connected in sequence, and all multiple wax scraping blades 201 are slidably connected to the mounting rod 101. Specifically, one end of the wax scraping blade 201 near the drill bit 121 is fixedly connected to the mounting rod 101, and one end of the wax scraping blade 201 near the rotating rod 111 is slidably connected to the mounting rod 101. The wax scraping blade 201 has a radially outwardly protruding scraping end 202. When the mounting rod 101 drives the wax scraping blade 201 to rotate around its own axis, the wax scraping blade 201 forms a continuous annular working profile, thereby performing annular cutting of the wax layer on the inner wall of the oil well.

[0025] Specifically, for hard residual wax layers close to the inner wall of the oil pipe, the wax scraper blade 201 cannot completely remove them in one go. In this case, the auxiliary scraping component 300 can intervene to perform secondary scraping. When encountering a hard wax layer with a large radial thickness, more wax layer remains after the wax scraper blade 201 cleans it. The axial resistance experienced by the auxiliary scraping component 300 during the scraping process increases, which in turn allows the entire wax scraper blade 201 to slide upward along the axial direction of the mounting rod 101. Figure 3 The wax scraper 201, located near the drill bit 121, is fixedly connected to the mounting rod 101. The scraper 201 is stretched axially, increasing its axial length while decreasing its radial protrusion. This reduces the radial dimension of the scraping end 202 and increases the axial contact area between the scraping end 202 and the wax layer, thus achieving uniform division and scraping of the thick wax layer, cutting it into smaller or thinner wax blocks.

[0026] When entering the wax-deposited section with a smaller radial thickness, the axial pressure on the auxiliary scraping assembly 300 decreases, and the auxiliary scraping assembly 300 drives the integral wax scraping blade 201 to slide down and reset along the axial direction of the mounting rod 101. Figure 3 In the vertical direction, the axial length of the wax scraper blade 201 shrinks to its original state, while the radial dimension of the scraping end 202 increases accordingly, and the radial protrusion also increases, reducing the axial contact area between the scraping end 202 and the wax layer. Therefore, through this adaptive adjustment, the wax scraper blade 201 can still effectively scrape off the wax layer, avoiding the accumulation of large wax debris due to excessive scraping area, and also preventing incomplete wax removal due to insufficient scraping area, thus reducing the risk of wax blockage in the oil well.

[0027] In one embodiment, along the traveling direction of the mounting rod 101, the radial dimension of the scraping end 202 of the wax scraper blade 201 gradually increases from bottom to top, and its rotation diameter during operation increases from bottom to top. Figure 5The scraping blade 201, located near the bottom of the mounting rod 101, has a smaller radial dimension, making it more prone to deformation when encountering wax layers of varying radial thicknesses, thus achieving automatic matching to changes in radial thickness. Specifically, when encountering a thicker, harder wax layer, the axial stretch of the scraping blade 201 closer to the bottom of the mounting rod 101 increases, while its radial protrusion decreases accordingly. This increases the axial contact area between the scraping end 202 and the wax layer, enabling uniform segmentation and scraping of the thick wax layer, cutting it into smaller or thinner blocks. Simultaneously, this top-wide, bottom-narrow structure ensures overall structural strength through the wider upper scraping blade 201 while reducing material usage and rotational resistance through the narrower lower section. This reduces ineffective power consumption while maintaining effective wax removal and allows for smoother flow of hot oil between the scraping blade 201 and the well wall, reducing flow resistance as hot oil carries wax blocks out.

[0028] In particular, the deformation of the wax scraper blade 201 during the wax scraping process enables the wax deposits adhering to the surface of the wax scraper blade 201 to automatically fall off under bending and shearing action, thereby achieving self-cleaning of the wax scraper blade 201.

[0029] In one embodiment, a limiting clamp 211 is provided at the connection of adjacent wax scraper blades 201, and the limiting clamp 211 is coaxially sleeved on the outside of the mounting rod 101. The mounting rod 101 has a first limiting groove 103 extending along its own axial direction, and a screw is installed on the limiting clamp 211. The screw slides into the first limiting groove 103, thereby limiting the radial sliding or displacement of the wax scraper blade 201, ensuring the structural stability of the wax scraper blade 201 during the adaptive deformation process, and ensuring that the wax scraper blade 201 always maintains the expected working posture and scraping contour during the rotation wax scraping process.

[0030] In one embodiment, the auxiliary scraping assembly 300 includes a sliding sleeve 301 and a wax scraper 302. The sliding sleeve 301 is coaxially sleeved on the outside of the rotating rod 111. The rotating rod 111 has a second limiting groove 113 extending along its own axial direction. The sliding sleeve 301 is slidably connected to the rotating rod 111 through the second limiting groove 113. The wax scraper 302 is coaxially fixedly connected to the sliding sleeve 301. Multiple scraping teeth 303 are fixedly arranged circumferentially on the sliding sleeve 301. The scraping teeth 303 can assist in scraping wax from the wax-covered well section. At the same time, the wax scraper 302 is fixedly connected to a limiting clamp 211 near the rotating rod 111. The limiting clamp 211 is pressed tightly against the wax scraping blade 201 at that location, thereby forming a fixed connection between the wax scraper 302 and one end of the wax scraping blade 201 near the rotating rod 111, so as to achieve synchronous linkage between the wax scraping blade 201 and the wax scraper 302 in the axial direction.

[0031] In one embodiment, the auxiliary scraping assembly 300 further includes a compression spring 304, one end of which is fixedly connected to the mounting rod 101, and the other end of which is fixedly connected to the sliding sleeve 301. The elastic force of the compression spring 304 always causes the scraper 302 to slide away from the rotating rod 111.

[0032] Specifically, for hard residual wax layers close to the inner wall of the oil pipe, the wax scraper blade 201 cannot completely remove them in one go. In this case, as the sliding sleeve 301 rotates and descends with the rotating rod 111, the scraping teeth 303 on the wax scraper 302 can intervene to perform secondary scraping. When encountering a hard wax layer with a large radial thickness, more wax layer remains after the wax scraper blade 201 cleans it. The axial resistance experienced by the wax scraper 302 during the scraping process increases, and thus the wax scraper 302 and the sliding sleeve 301 slide upwards along their own axial direction relative to the rotating rod 111. Figure 6 In the vertical direction, the compression spring 304 is compressed. Since one end of the wax scraper 201 near the drill bit 121 is fixedly connected to the mounting rod 101, and the wax scraper 302 is fixedly connected to one end of the wax scraper 201 near the rotating rod 111, the wax scraper 201 is stretched axially, its axial length increases while the radial protrusion decreases accordingly, increasing the axial contact area between the scraping end 202 and the wax layer, thereby achieving uniform division and scraping of the thick wax layer, cutting the wax layer into smaller or thinner wax blocks. When entering the wax-forming section with a smaller radial thickness, the axial pressure on the wax scraper 302 decreases, and the compression spring 304 releases its elastic force, causing the sliding sleeve 301 and the wax scraper 302 to drive the entire wax scraper 201 to slide down and reset along the axial direction of the mounting rod 101.

[0033] In one embodiment, the sliding sleeve 301 is provided with multiple through-holes 311, which are circumferentially distributed on the sliding sleeve 301 and communicate with the inside of the oil well and the external environment. Specifically, during the wax scraping process, hot oil is injected into the hollow channel 102 through the connecting groove 112 and flows into the oil well through the oil outlet 104 and the oil outlet 122, melting the scraped wax blocks. Then, the hot oil carrying the molten wax blocks is discharged from the drain holes 311, thereby effectively preventing the wax blocks from accumulating in the oil well.

[0034] In one embodiment, the scraping end 202 of the wax scraper blade 201 in the above embodiment is provided as an inclined surface, such as... Figure 3 As shown, the inclined surface is inclined radially toward the mounting rod 101, allowing it to scrape the wax layer at a more favorable cutting angle, thereby improving the scraping effect. Specifically, as... Figure 11As shown, the scraping end 202 can also be configured as a horizontal plane. Although its cutting angle is slightly inferior to that of an inclined configuration, it simplifies the processing technology and reduces manufacturing costs. In practical applications, the appropriate structural form can be selected according to the specific requirements of the processing technology and operating conditions.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A rotary wax scraping tool for use in wells with severe wax buildup, characterized in that, include: The mounting rod is rotatable about its own axis; a drill bit is coaxially connected to the end of the mounting rod, and the drill bit is used to guide the mounting rod to be lowered. A wax scraping assembly is installed on the outside of the mounting rod. The wax scraping assembly has a scraping end, which is used to scrape wax from the wax-covered well section when the mounting rod rotates around its own axis. A hollow channel is coaxially formed inside the mounting rod, containing hot oil. An oil outlet is formed at the bottom end of the mounting rod, communicating with the hollow channel. An oil outlet is formed inside the drill bit, communicating with the oil outlet and the inside of the well. The oil outlet guides the hot oil to the scraping end to melt the wax. The auxiliary scraping component can adjust the radial dimension of the scraping end when encountering wax layers of different radial thicknesses, so as to scrape off wax layers of different radial thicknesses. A rotating rod is coaxially provided at the end of the mounting rod away from the drill bit. The rotating rod is coaxially threadedly connected to the mounting rod, and the rotating rod can drive the mounting rod to rotate around its own axis. The wax scraping assembly is configured in two sets, and the two sets of wax scraping assemblies are symmetrically installed on the outside of the mounting rod; Each set of the wax scraping assembly includes multiple wax scraping blades, which are distributed along the axial direction of the mounting rod. Adjacent wax scraping blades are connected in sequence, and all wax scraping blades are slidably connected to the mounting rod. One end of the wax scraping blade near the drill bit is fixedly connected to the mounting rod, and one end of the wax scraping blade near the rotating rod is slidably connected to the mounting rod. The wax scraping blade has a scraping end that protrudes radially outward. When encountering wax layers of different radial thicknesses, the auxiliary scraping assembly can drive the radial dimensions of the multiple scraping ends to change.

2. The rotary wax scraping tool for wells with severe wax buildup according to claim 1, characterized in that, Along the travel direction of the mounting rod, the radial dimension of the scraping end gradually increases from bottom to top.

3. The rotary wax scraping tool for wells with severe wax buildup according to claim 1, characterized in that, A limiting clamp is provided at the connection between adjacent wax scraper blades. The limiting clamp is coaxially installed on the outside of the mounting rod and is slidably connected to the mounting rod. The limiting clamp is used to restrict the radial sliding of the wax scraper blade.

4. The rotary wax scraping tool for wells with severe wax buildup according to claim 1, characterized in that, The auxiliary scraping assembly includes a sliding sleeve and a wax scraper. The sliding sleeve is coaxially sleeved on the outside of the rotating rod and is slidably connected to the rotating rod. The wax scraper is coaxially fixedly connected to the sliding sleeve. Multiple scraping teeth are fixedly arranged circumferentially on the sliding sleeve, and the scraping teeth can perform auxiliary wax scraping. The wax scraper is connected to one end of the wax scraping blade near the rotating rod.

5. The rotary wax scraping tool for wells with severe wax buildup according to claim 4, characterized in that, The auxiliary scraping assembly also includes a compression spring, one end of which is fixedly connected to the mounting rod, and the other end of which is fixedly connected to the sliding sleeve; the elastic force of the compression spring always causes the scraper to slide away from the rotating rod.

6. The rotary wax scraping tool for wells with severe wax buildup according to claim 4, characterized in that, The sliding sleeve is provided with multiple through-holes for draining the hot oil carrying the wax block.

7. The rotary wax scraping tool for wells with severe wax buildup according to claim 1, characterized in that, The scraping end of the wax scraper blade is configured with an inclined surface.

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