Efficient paraffin remover for ground oil pipe of operating well

Abstract

The invention relates to the technical field of oil pipe paraffin removal devices, in particular to an efficient paraffin remover for a ground oil pipe of an operating well, which comprises a baffle, a connecting rod and a nozzle. The device is reasonable and compact in structure and convenient to use, high-temperature steam is jetted to the inner wall of the oil pipe through the six inclined jet holes which are spirally arranged in a windmill shape, the inner wall of the oil pipe can be scoured powerfully, part of deposited wax is removed, and meanwhile the device is assisted to scrape the deposited wax when the oil pipe advances spirally; the second paraffin scraper baffle and the inner wall of the oil pipe form a high-temperature paraffin melting chamber, high-temperature steam rotates at a high speed in the high-temperature paraffin melting chamber to accelerate wax deposition melting, molten wax on the inner wall of the oil pipe can be conveniently and rapidly scraped off through the first paraffin scraper and the second paraffin scraper subsequently, finally, the wax deposition on the inner wall of the oil pipe is completely cleaned up, and the paraffin removal operation efficiency is effectively improved. Therefore, the service time of the boiler vehicle is shortened, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe wax cleaning devices, in particular to a high-efficiency wax cleaning device for a surface oil pipe of an operating well. Background Art

[0002] Most of the oil reservoirs in my country's production management areas are low-porosity and low-permeability reservoirs. The conventional process measures for wax removal and wax prevention in these oil wells are very limited during production. The oil pipes in the operating wells are generally seriously waxed and difficult to clean. At present, when the oil wells are operated, the original well oil pipes are usually removed by boiler trucks for ground wax cleaning. Because there are no special tools, the usual practice is to install a lance at the front end of the boiler truck steam pipeline, insert the lance into the female buckle end of the oil pipe, and use the steam heat of the boiler truck to melt the wax inside the oil pipe into liquid and bring it out of the oil pipe cavity through the high-pressure steam flow. During the piercing and cleaning process, the high-pressure steam is in a laminar state. The closer to the pipe wall, the slower the sprint speed and the lower the temperature. The closer to the center of the inner cavity of the oil pipe, the higher the temperature, but it is directly sprayed out at high speed from the male buckle end without control, and the residence time in the oil pipe is short, and the thermal efficiency cannot be fully utilized. In order to clean the wax on the inner wall of the oil pipe, each oil pipe takes an average of more than 10 minutes. It is more difficult to clean the wax in winter for oil pipes with a lot of wax, and each pipe takes more than 10-20 minutes.

[0003] The Chinese patent document with the announcement number CN2833100Y discloses a ground oil pipe wax cleaner, which includes a gear box, a wheel box connected with a rack and a gear, and its lifting mechanism is connected with the gear box, the gear, and the drill bit through the oil pipe through the rack transmission, and the oil pipe is fixedly connected with a power source, and the lower end of the oil pipe is connected with a hanging card and a wellhead flange from top to bottom. When the wax blockage is serious, it is convenient to clean the wax-blocked oil pipe, and it has good safety and strong anti-seismic performance; but the device is relatively complex and troublesome to use, and is more suitable for cleaning seriously blocked oil pipes.

[0004] Therefore, the steam piercing wax cleaning method used in existing boiler cars has the following shortcomings in actual use due to the high wax content, high viscosity and low freezing point of crude oil: the boiler car has a long working time, high fuel consumption, long oil pipe piercing time, low piercing efficiency and poor wax cleaning effect. Summary of the invention

[0005] The present invention provides a high-efficiency wax cleaner for the ground oil pipe of an operating well, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of the existing steam piercing wax cleaning method, such as long boiler car working time, high fuel consumption, long oil pipe piercing time, low piercing efficiency and poor wax cleaning effect.

[0006] The technical solution of the present invention is achieved through the following measures: a high-efficiency wax cleaner for a ground oil pipe in an operating well, comprising a baffle, a connecting rod and a nozzle, a connecting rod is fixedly installed on the middle part of the left side of the baffle, a nozzle is fixedly installed on the outer side of the left end of the connecting rod, at least three air jet holes opening outward are evenly distributed along the circumference in the middle part of the nozzle, a connecting hole opening to the left and connected to the air jet hole at the right end is provided on the left side of the nozzle, a hollow tube with an axial flow channel is fixedly installed in the connecting hole, a wax scraper assembly capable of scraping wax deposited on the inner wall of the oil pipe is installed on the outer side of the hollow tube corresponding to the left side of the nozzle, and a fastener whose right end abuts against the left side of the wax scraper assembly is fixedly installed on the outer side of the left part of the hollow tube.

[0007] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned wax scraper assembly may include a first wax scraper and a second wax scraper. The first wax scraper in the shape of a cone with a larger left side and a smaller right side is provided on the outside of the hollow tube corresponding to the right side of the fastener, and at least one second wax scraper in the shape of a cone with a smaller left side and a larger right side is provided on the outside of the hollow tube corresponding to the position between the first wax scraper and the nozzle.

[0008] The above-mentioned wax scraper assembly may also include a first gasket and a second gasket. Four second wax scraper plates with a small left and a large right cone are provided on the outside of the hollow tube corresponding to the position between the first wax scraper and the nozzle. A first gasket mounted on the outside of the hollow tube is provided between two adjacent second wax scrapers, between the second wax scraper and the nozzle, and between the first wax scraper and the fastener. A second gasket mounted on the outside of the hollow tube is provided between the second wax scraper and the first wax scraper.

[0009] The first wax scraping blade and the second wax scraping blade can both be polyurethane wax scraping blades.

[0010] At least three inclined jet holes with higher outside and lower inside can be evenly distributed along the circumference in the middle of the nozzle. All the jet holes are arranged in a windmill-like spiral around the nozzle axis. The nozzle is in a cone shape with larger left and smaller right from the middle to the right.

[0011] The middle part of the nozzle is evenly distributed along the circumference with six inclined air-jet holes which are high outside and low inside.

[0012] The baffle may be in the shape of a frustum with a small left side and a large right side.

[0013] The invention has a reasonable and compact structure and is easy to use. The high-temperature steam is sprayed toward the inner wall of the oil pipe through six inclined jet holes arranged in a windmill shape spirally, which can strongly flush the inner wall of the oil pipe and remove part of the wax deposits, while assisting the device to scrape the wax deposits when the oil pipe spirally advances; the second wax scraper baffle and the inner wall of the oil pipe form a high-temperature wax melting chamber, and the high-temperature steam rotates at a high speed in the high-temperature wax melting chamber to quickly heat the wax deposits in the high-temperature wax melting chamber, accelerate the melting speed of the wax deposits, and facilitate the subsequent rapid scraping of the melted wax on the inner wall of the oil pipe by the first wax scraper and the second wax scraper, and finally clean up all the wax deposits on the inner wall of the oil pipe, effectively improving the efficiency of the wax cleaning operation, saving operation time, thereby shortening the use time of the boiler car and reducing the operation cost; the first wax scraper with the large diameter end facing left can increase the contact area with the high-temperature steam while scraping off the wax deposits, so that it is convenient to quickly push the device to move along the axial direction of the oil pipe by the high-temperature steam, thereby improving the efficiency of the wax cleaning operation and shortening the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the main view and partial cross-section structure of Example 1 of the present invention.

[0015] Attached Figure 2 For attachment Figure 1 Schematic diagram of the right view structure of the nozzle.

[0016] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the nozzle.

[0017] The codes in the accompanying drawings are: 1 is a baffle, 2 is a connecting rod, 3 is a nozzle, 4 is an air injection hole, 5 is a connecting hole, 6 is an axial flow channel, 7 is a hollow tube, 8 is a fastener, 9 is a first wax scraper, 10 is a second wax scraper, 11 is a first gasket, and 12 is a second gasket. DETAILED DESCRIPTION

[0018] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0019] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0020] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown in Figures 3 and 4, the high-efficiency wax remover for the surface oil pipe of the working well comprises a baffle 1, a connecting rod 2 and a nozzle 3. The connecting rod 2 is fixedly installed on the middle part of the left side of the baffle 1, and the nozzle 3 is fixedly installed on the outer side of the left end of the connecting rod 2. At least three air-jet holes 4 opening outward are evenly distributed along the circumference in the middle part of the nozzle 3. A connecting hole 5 opening to the left and the right end connected with the air-jet hole 4 is provided on the left side of the nozzle 3. A hollow tube 7 with an axial flow channel 6 is fixedly installed in the connecting hole 5. A wax scraper assembly capable of scraping wax deposited on the inner wall of the oil pipe is installed on the outer side of the hollow tube 7 corresponding to the left side of the nozzle 3. A fastener 8 with the right end abutting against the left side of the wax scraper assembly is fixedly installed on the outer side of the left part of the hollow tube 7.

[0021] By such arrangement, a relatively closed high-temperature wax melting chamber can be formed between the right side of the wax scraper assembly, the left side of the baffle 1 and the inner side of the oil pipe. When the high-temperature wax melting chamber is filled with high-temperature steam, the high-temperature wax melting chamber and the inner walls of the oil pipes on its left and right can be quickly and locally heated, so that the deposited wax can be quickly and fully melted, so that the baffle 1 can move forward smoothly. At the same time, in the process of the wax scraper assembly moving to the right, the melted deposited wax can be scraped off more cleanly and quickly, thereby saving wax cleaning time, improving work efficiency, and shortening the use time of the boiler car; a relatively closed high-temperature and high-pressure steam chamber can be formed between the left end face of the wax scraper assembly and the inner wall of the oil pipe, which can better drive the device to move along the axial direction of the oil pipe through the high-temperature steam, and can also make The high-temperature steam is all ejected through the axial flow channel 6 in the hollow tube 7 and the jet hole 4 on the nozzle 3. The jet through the jet hole 4 can make the high-temperature steam produce a stronger radial impact force on the wax deposited on the inner wall of the oil pipe, so as to wash the wax deposited more quickly and improve the working efficiency. The inner wall of the oil pipe at this position can also be heated again, and the fine wax deposited remaining on the inner wall of the oil pipe is melted and falls off. In addition, the inner wall of the oil pipe can be locally and fully heated by this device. When there are fine sand holes on the wall of the oil pipe, the positions of defects such as cracks, sand holes and pores can be quickly and accurately determined by observing the water droplets condensed by the high-temperature steam that seeps out of the outer wall of the oil pipe. Unqualified oil pipes can be quickly picked out to avoid rework, and subsequent oil pipe repair and positioning are convenient.

[0022] According to the requirements, in order to ensure the connection strength between the connecting rod 2 and the baffle 1, the connection between the connecting rod 2 and the baffle 1 can be partially thickened. The connecting rod 2 and the baffle 1 can also be formed by casting or machining in one piece or welding or screwing or riveting in the existing known technology. In addition, in order to prevent the baffle 1 from scratching the inner wall of the oil pipe and avoid the device from getting stuck, the outer diameter of the baffle 1 should be slightly smaller than the inner diameter of the oil pipe. In this embodiment, the inner diameter of the oil pipe is 62 mm, the outer diameter of the baffle 1 is 58 mm, and the length of the connecting rod 2 is 100 mm. mm; to enhance the wear resistance of the nozzle 3, the nozzle 3 can be a 50 steel nozzle 3; the connection between the connecting rod 2 and the nozzle 3, and between the nozzle 3 and the hollow tube 7 can be achieved by riveting or welding or bonding or interference connection or threaded connection or set screw connection in the existing known technology. In this embodiment, threaded connection is used to facilitate disassembly and replacement of parts; the wax scraper assembly can be achieved by a wire roller brush or sponge roller brush or oil-resistant rubber roller brush with baffles at both ends in the existing known technology, or a set wax scraper assembly; the fastener 8 and the hollow tube 7 can be fixedly installed by screwing or welding or bonding or riveting or interference connection in the existing technology. In order to facilitate the disassembly and replacement of the wax scraper assembly, the fastener 8 in this embodiment is a fastening nut screwed on the outside of the hollow tube 7.

[0023] The invention has a reasonable and compact structure and is easy to use. After the high-temperature steam passes through the hollow tube and the jet hole 4, it can strongly rush onto the inner wall of the oil pipe to flush the wax deposited on the inner wall of the oil pipe; the high-temperature wax melting chamber formed on the right side of the wax scraper assembly, the left side of the baffle 1 and the inner side of the oil pipe can gather the high-temperature steam together to locally heat the inner wall of the oil pipe, and then melt the wax deposited after fully heating it with the high-temperature steam; the high-temperature and high-pressure steam chamber formed by the left end face of the wax scraper assembly and the inner wall of the oil pipe can push the device to move axially along the oil pipe, so that the wax scraper assembly can quickly scrape off the melted wax deposited, which greatly improves the wax cleaning efficiency, effectively shortens the oil pipe wax cleaning time, and then shortens the working time of the boiler car, saving the cost of the oil pipe wax cleaning operation.

[0024] According to actual needs, the above-mentioned surface oil pipe high-efficiency wax remover for operating wells can be further optimized and / or improved: Embodiment 2: As attached Figure 1 As shown, the wax scraper assembly includes a first wax scraper 9 and a second wax scraper 10. The first wax scraper 9 in the shape of a cone with a larger left side and a smaller right side is provided on the outside of the hollow tube 7 corresponding to the right side of the fastener 8, and at least one second wax scraper 10 in the shape of a cone with a smaller left side and a larger right side is provided on the outside of the hollow tube 7 corresponding to the position between the first wax scraper 9 and the nozzle 3.

[0025] By such an arrangement, the first wax scraper blade 9 and the second wax scraper blade 10 in the shape of a cone can not only facilitate the scraping of the melted wax on the inner wall of the oil pipe, but also prevent the friction between them and the inner wall of the oil pipe from being too large to hinder the rapid movement of the device along the axial direction of the oil pipe or the bending and deformation of the wax scraper blade. The large diameter end of the first wax scraper blade 9 can also form a high-temperature and high-pressure steam chamber with the inner wall of the oil pipe, and the large diameter end of the second wax scraper blade 10 can also form a high-temperature wax melting chamber with the inner wall of the oil pipe and the baffle 1. In addition, by adjusting the tightness of the fastener 8 or the number of the second wax scraper blades 10, the cleaning effect and forward speed of the device on the inner wall of the oil pipe can be quickly adjusted.

[0026] According to requirements, the first wax scraper blade 9 and the second wax scraper blade 10 can be realized by oil-resistant soft rubber or polyurethane rubber in the existing known technology. In order to prevent the first wax scraper blade 9 and the second wax scraper blade 10 from being squeezed and deformed and expanded by high-temperature steam and getting stuck in the oil pipe, the maximum outer diameter of the first wax scraper blade 9 and the second wax scraper blade 10 should be slightly smaller than the inner diameter of the oil pipe.

[0027] Embodiment 3: As attached Figure 1 As shown, the wax scraper assembly also includes a first gasket 11 and a second gasket 12. Four second wax scrapers 10 with a small left and a large right cone are provided on the outside of the hollow tube 7 corresponding to the position between the first wax scraper 9 and the nozzle 3. A first gasket 11 which is sleeved on the outside of the hollow tube 7 is provided between two adjacent second wax scrapers 10, between the second wax scraper 10 and the nozzle 3, and between the first wax scraper 9 and the fastener 8. A second gasket 12 which is sleeved on the outside of the hollow tube 7 is provided between the second wax scraper 10 and the first wax scraper 9.

[0028] Through such an arrangement, the contact area between two adjacent second wax scraping blades 10, between the second wax scraping blade 10 and the nozzle 3, between the first wax scraping blade 9 and the fastener 8, and between the first wax scraping blade 9 and the second wax scraping blade 10 can be effectively increased to prevent wear. At the same time, it can be ensured that the fastener 8 and the nozzle 3 can reliably squeeze the first wax scraping blade 9 and the second wax scraping blade 10 together to prevent the wax scraping blades from rotating and loosening, thereby enabling the first wax scraping blade 9 and the second wax scraping blade 10 to better scrape away the wax that has been heated and melted.

[0029] Embodiment 4: As attached Figure 1 As shown, the first wax scraping blade 9 and the second wax scraping blade 10 are both polyurethane wax scraping blades. Such arrangement is because polyurethane has the advantages of heat insulation, oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness and good elasticity.

[0030] Embodiment 5: As attached Figure 1 , 2 As shown in FIG. 3 , at least three jet holes 4 with high outside and low inside are evenly distributed along the circumference in the middle of the nozzle 3. All the jet holes 4 are arranged in a windmill-like spiral around the axial direction of the nozzle 3. The nozzle 3 is in a cone shape from the middle to the right with a larger left and a smaller right.

[0031] According to the requirements, in order to make the jet holes 4 arranged in a windmill-like spiral around the axial direction of the nozzle 3, the inclined hole axis of the jet hole 4 should be perpendicular to the frustum surface in the middle of the nozzle 3. At this time, the inclined hole axis of the jet hole 4 can be at an angle of 45° to the axis of the nozzle 3 and at an angle of 40° to the radial direction of the nozzle 3, so that the high-temperature steam flow is ejected out of the nozzle 3 in a spiral divergent shape, and the steam with the highest temperature and the strongest impact force directly acts on the inner wall of the oil pipe, and the wax cleaning efficiency is the highest. In addition, the spirally divergent high-temperature steam can also make the device rotate and move forward in the oil pipe, so that it can perform milling movement to better remove wax deposits.

[0032] Embodiment 6: As attached Figure 1 , 2 As shown in FIG. 3 , six inclined air injection holes 4 are evenly distributed along the circumference of the middle part of the nozzle 3 and are high outside and low inside.

[0033] By providing six inclined air jet holes 4 arranged in a windmill-like spiral pattern, the inner wall of the oil pipe can be heated more fully to melt the wax, and sufficient power can be provided for the device to rotate and move forward on the inner wall of the oil pipe.

[0034] Embodiment 7: As attached Figure 1 As shown, the baffle 1 is in the shape of a cone with a small left side and a large right side.

[0035] With such an arrangement, the frustum-shaped baffle 1 is more conducive to forming an annular gap between the baffle 1 and the inner wall of the oil pipe, and the swirl steam in the high-temperature wax melting chamber is ejected from the annular gap to preliminarily melt the wax on the inner wall of the oil pipe in front of the baffle.

[0036] The method of using this device is as follows: First, connect the wax drain cap to the male buckle end of the oil pipe to keep the wax drain hole on the wax drain cap unobstructed; secondly, locally heat the female buckle end of the oil pipe through the steam lance on the boiler car to soften the wax on the female buckle end, and then put the device into the oil pipe from the female buckle end and pour high-temperature steam into it again. As the high-temperature steam accumulates, the first wax scraper 9 can gradually push the device to move axially along the oil pipe. In the above process, after the high-temperature steam passes through the axial flow channel 6 in the hollow tube 7, it will be sprayed toward the inner wall of the oil pipe from six inclined jet holes 4 arranged in a windmill shape spirally, and the inner wall of the oil pipe will be washed with high speed and force. The device also assists the device to spirally advance in the oil pipe to simulate the milling action, so as to better scrape off the melted wax. At the same time, the high-temperature steam radially and spirally flushes in the high-temperature wax melting chamber, and the wax on the inner wall of the oil pipe in the high-temperature wax melting chamber and in front and behind the chamber is melted by local rapid heating of the high-temperature steam. Finally, the first wax scraper blade 9 and the second wax scraper blade 10 are used to quickly scrape off the melted wax adhering to the inner wall of the oil pipe, so that the wax liquid is discharged from the oil pipe through the wax drain hole. In this process, it is also possible to check whether there are condensed water droplets or seeping white gas on the outer wall of the oil pipe to check whether there are defects such as cracks, sand holes, and pores in the oil pipe.

[0037] The invention has a reasonable and compact structure and is easy to use. The high-temperature steam is sprayed toward the inner wall of the oil pipe through six inclined jet holes 4 arranged in a windmill shape and spirally, which can strongly flush the inner wall of the oil pipe and remove part of the wax deposits, and at the same time assist the device to scrape the wax deposits when the oil pipe spirally moves forward; the second wax scraper 10 baffle 1 and the inner wall of the oil pipe form a high-temperature wax melting chamber, and the high-temperature steam rotates at a high speed in the high-temperature wax melting chamber to quickly heat the wax deposits in this area, accelerate the melting speed of the wax deposits, and facilitate the subsequent rapid scraping of the wax deposits on the inner wall of the oil pipe by the first wax scraper 9 and the second wax scraper 10, and finally clean up all the wax deposits on the inner wall of the oil pipe, effectively improving the efficiency of the wax cleaning operation, saving operation time, thereby shortening the use time of the boiler car and reducing costs; the first wax scraper 9 with the large diameter end facing left can increase the contact area with the high-temperature steam while scraping off the wax deposits, so as to facilitate the rapid promotion of the device to move along the axial direction of the oil pipe by the high-temperature steam, thereby improving the efficiency of the wax cleaning operation and shortening the operation time.

[0038] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An efficient wax remover for surface oil pipes in working wells, characterized in that It includes a baffle, a connecting rod and a nozzle. A connecting rod is fixedly installed on the middle part of the left side of the baffle, and a nozzle is fixedly installed on the outer side of the left end of the connecting rod. At least three air injection holes opening outward are evenly distributed along the circumference in the middle part of the nozzle. A connecting hole opening to the left and connected with the air injection hole at the right end is provided on the left side of the nozzle. A hollow tube with an axial flow channel is fixedly installed in the connecting hole. A wax scraper assembly capable of scraping wax on the inner wall of the oil pipe is installed on the outer side of the hollow tube corresponding to the left side of the nozzle, and a fastener with the right end abutting against the left side of the wax scraper assembly is fixedly installed on the outer side of the left part of the hollow tube.

2. The high-efficiency wax remover for surface oil pipes in working wells according to claim 1 is characterized in that The wax scraper assembly includes a first wax scraper and a second wax scraper. The first wax scraper in the shape of a cone with a larger left side and a smaller right side is provided on the outside of the hollow tube corresponding to the right side of the fastener, and at least one second wax scraper in the shape of a cone with a smaller left side and a larger right side is provided on the outside of the hollow tube corresponding to the position between the first wax scraper and the nozzle.

3. The high-efficiency wax remover for surface oil pipes in working wells according to claim 2, characterized in that The wax scraper assembly also includes a first gasket and a second gasket. Four second wax scrapers with a small left and a large right cone are provided on the outside of the hollow tube corresponding to the position between the first wax scraper and the nozzle. A first gasket mounted on the outside of the hollow tube is provided between two adjacent second wax scrapers, between the second wax scraper and the nozzle, and between the first wax scraper and the fastener. A second gasket mounted on the outside of the hollow tube is provided between the second wax scraper and the first wax scraper.

4. The high-efficiency wax remover for surface oil pipes in working wells according to claim 2 or 3, characterized in that The first wax scraping blade and the second wax scraping blade are both polyurethane wax scraping blades.

5. The high-efficiency wax remover for surface oil pipes in working wells according to claim 1, 2 or 3, characterized in that At least three jet holes with high outside and low inside are evenly distributed along the circumference in the middle of the nozzle. All the jet holes are arranged in a windmill-like spiral around the nozzle axis. The nozzle is in a cone shape with larger left and smaller right from the middle to the right.

6. The high-efficiency wax remover for surface oil pipes in working wells according to claim 4, characterized in that At least three jet holes with high outside and low inside are evenly distributed along the circumference in the middle of the nozzle. All the jet holes are arranged in a windmill-like spiral around the nozzle axis. The nozzle is in a cone shape with larger left and smaller right from the middle to the right.

7. The high-efficiency wax remover for surface oil pipes in working wells according to claim 5, characterized in that Six jet holes are evenly distributed along the circumference in the middle of the nozzle, which are inclined in a shape of high outside and low inside.

8. The high-efficiency wax remover for surface oil pipes in working wells according to claim 6, characterized in that Six jet holes are evenly distributed along the circumference in the middle of the nozzle, which are inclined in a shape of high outside and low inside.

9. The high-efficiency wax remover for surface oil pipes in working wells according to claim 1, 2, 3 or 6, characterized in that The baffle is in the shape of a cone with a small left side and a large right side.

10. The high-efficiency wax remover for surface oil pipes in working wells according to claim 5, characterized in that The baffle is in the shape of a cone with a small left side and a large right side.

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