Desulfurization tool

Abstract

The invention relates to the technical field of underground operation, in particular to a sulfur removal tool which comprises a center rod, the upper end of the center rod is a collided end, the lower end of the center rod is a pushing end, the outer side of the lower end of the center rod is sleeved with a sulfur removal outer cylinder in a guiding and sliding mode, and the sulfur removal outer cylinder is a conical cylinder with the diameter gradually reduced from top to bottom so that the sulfur removal outer cylinder can be lifted and put down conveniently. The movable scraping piece is matched with the pushing end through a conical surface, an avoiding groove for the movable scraping piece to radially float so as to protrude out of and retract into the outer barrel wall of the outer desulfurization barrel is formed in the outer desulfurization barrel, and the movable scraping piece can be ejected outwards when the pushing end moves downwards relative to the outer desulfurization barrel; the movable scraping part is arranged on the center rod, so that the movable scraping part is matched with the desulfurization outer barrel to scrape and remove sulfur scales with different deposition thicknesses in the radial direction to ensure the desulfurization effect, and the elastic part is elastically jacked after the center rod is collided to move to the lowest end, so that the movable scraping part retracts into the desulfurization outer barrel, and a desulfurization tool is smoothly taken out of a tubular column.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole operations, and in particular to a desulfurization tool. Background Art

[0002] During the extraction process of acidic gas reservoirs, elemental sulfur dissolved in the acid gas flows from the formation into the wellbore along with the natural gas. Due to the drop in pressure and temperature, the solubility of elemental sulfur in the gas decreases. When the elemental sulfur content exceeds the natural gas saturation point, elemental sulfur in the gas will continuously precipitate from the natural gas. If the gas flow velocity in the gas well does not reach the critical speed for elemental sulfur removal, the elemental sulfur will be deposited on the inner wall of the production tubing. Over time, the amount of deposits will gradually increase, the inner diameter of the production tubing will decrease, and it may even become blocked, resulting in a decrease in gas production and seriously affecting the normal production of the gas field.

[0003] Currently, the commonly used desulfurization methods in gas fields are chemical desulfurization and mechanical desulfurization. Currently, chemical desulfurization mainly uses pickling, which involves preparing a sulfur dissolving agent to dissolve the sulfur in the wellbore. The sulfur dissolving agent is then added to the wellbore, and after several days of chemical reaction, the sulfur is deposited and falls off. However, this method not only has complex on-site construction processes, but the sulfur dissolving agents are generally highly toxic, easily contaminating the well fluid and failing to meet environmental protection requirements. For example, the utility model patent with authorization announcement number CN216811650U discloses a scraper for desulfurizing the inner wall of a downhole production tubing string and a desulfurization device using the scraper. Specifically, the device includes a core rod component, a centralizer, an upper blade assembly and a lower blade assembly slidably mounted on the core rod component. The outer diameter of the upper blade assembly is larger than that of the lower blade assembly, and the upper and lower blade assemblies cooperate to remove impurities from the pipe.

[0004] However, due to the large outer diameter of the upper knife assembly, it cannot be lowered to the place where sulfur deposition is more serious. Although the lower knife assembly can be lowered to a relatively deeper place than the upper knife assembly, after scraping the thicker sulfur scale once, the lower knife assembly cannot scrape the sulfur scale with a smaller thickness at the same depth again. At this time, the sulfur scale scraped by the lower knife assembly still has a certain thickness, which may not be able to be lowered by the upper knife assembly for a second scraping. There may even be a situation where the upper knife assembly is stuck and needs to be unstuck, making the operation complicated. Not only will the desulfurization effect fail to achieve the expected effect, but it will also easily cause the entire desulfurization cycle to take too long. Summary of the Invention

[0005] The purpose of the present invention is to provide a desulfurization tool to solve the problem that scraper assemblies with different radii in the desulfurization device in the prior art cannot effectively remove sulfur scales with different radial deposition thicknesses at the same depth and are prone to jamming.

[0006] To achieve the above object, the technical solution of the desulfurization tool provided by the present invention is as follows: It includes a central rod. The upper end of the central rod is the impacted end, and the lower end is the pushing end. A desulfurization outer cylinder is slidably sleeved on the outer side of the lower end of the central rod in a guiding manner. The desulfurization outer cylinder is a conical cylinder with a gradually decreasing diameter from top to bottom. An active scraping member is arranged at the pushing end. The active scraping member and the pushing end are in conical surface fit. The desulfurization outer cylinder is provided with a relief groove for the active scraping member to radially float to protrude and retract from the outer wall of the desulfurization outer cylinder. When the pushing end moves downward relative to the desulfurization outer cylinder, the active scraping member can be pushed outwards. An elastic member is arranged between the desulfurization outer cylinder and the central rod to provide elastic acting forces in opposite axial directions to the two, so as to be elastically lifted after the central rod moves to the lowest position by impact.

[0007] As a further improvement, the active scraping member and the desulfurization outer cylinder are respectively provided with spiral scraping edges in the same direction.

[0008] As a further improvement, the spiral scraping edge is arranged downward.

[0009] As a further improvement, the pushing end is a conical columnar structure, and the inner side surface of the active scraping member is inclined and adapted to the outer conical surface of the pushing end.

[0010] As a further improvement, the active scraping member and the pushing end are in guiding sliding fit in the vertical direction through a radial anti-disengagement chute on one of them and a matching slider on the other, and the groove wall of the relief groove stops and limits the active scraping member axially.

[0011] As a further improvement, the radial anti-disengagement chute is a dovetail groove, and the slider is a dovetail-shaped slider.

[0012] As a further improvement, the active scraping member is long and extends vertically.

[0013] As a further improvement, the lower part of the relief groove on the desulfurization outer cylinder extends to the bottom of the desulfurization outer cylinder. The relief groove is of an inverted U-shaped structure and the bottom of the desulfurization outer cylinder has a sealing structure.

[0014] As a further improvement, the central rod is screwed with an adjusting nut, and the elastic member abuts between the adjusting nut and the desulfurization outer cylinder.

[0015] The beneficial effects are as follows: Based on the problems existing in the downhole desulfurization device in the prior art, the present invention proposes a brand-new downhole desulfurization tool. During the process of lowering the desulfurization tool into the production string, the desulfurization tool is in an initial radius state with a relatively small radial dimension. At the same time, the conical desulfurization outer cylinder is easy to lower and has a guiding effect, so that the desulfurization tool can smoothly enter the position with severe sulfur deposition, and can be quickly taken out of the production string after scraping. Moreover, the movable scraping member and the pushing end are in conical surface fit, so that during the downward movement of the central rod, the pushing end can act on the movable scraping member to protrude the movable scraping member from the avoidance groove on the desulfurization outer cylinder. The working radius of the movable scraping member for scraping is larger than the working radius of the desulfurization outer cylinder. Each time the movable scraping member protrudes from the avoidance groove, the sulfur scale on the inner wall of the production string can be scraped. During multiple continuous shock processes, the desulfurization tool is continuously lifted and lowered, so that the sulfur scale with different radial deposition thicknesses can be efficiently and thoroughly scraped and removed through the cooperation of the movable scraping member and the desulfurization outer cylinder, and the desulfurization effect is better. After the scraping operation is completed, under the action of the elastic member, the desulfurization tool can be restored to the initial outer diameter state with a relatively small radial dimension, which is convenient for taking out from the production string and is not prone to jamming accidents. Compared with the prior art, the desulfurization tool provided by the present invention can be lowered to the position with relatively thick deposition in the production string, and can scrape the sulfur scale at the same depth multiple times, greatly improving the scraping effect, making the desulfurization more thorough. During the process of lowering and taking out, the outer diameter of the desulfurization tool is relatively small, which can not only avoid jamming, but also save the time cost consumed during the desulfurization operation of the gas well, with higher working efficiency, and provides a strong guarantee for the normal production of the gas well. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of an embodiment of the desulfurization tool provided by the present invention; Figure 2 FIG. is a three-dimensional structure diagram of an embodiment of the outer cylinder cap in the desulfurization outer cylinder of the desulfurization tool provided by the present invention; Figure 3 FIG. is a three-dimensional structure diagram of an embodiment of the outer cylinder body in the desulfurization outer cylinder of the desulfurization tool provided by the present invention; Figure 4 FIG. is a three-dimensional structure diagram of an embodiment of the movable scraping member of the desulfurization tool provided by the present invention; Figure 5 FIG. is a three-dimensional structure diagram of an embodiment of the pushing end of the desulfurization tool provided by the present invention; In the figure: 1. Connector; 2. Connecting sleeve; 3. Central rod; 4. Adjusting nut; 5. Elastic member; 6. Outer cylinder cap; 61. Inner hole of outer cylinder cap; 62. Connecting thread of outer cylinder cap; 7. Outer cylinder body; 71. Avoidance groove; 8. Movable scraping member; 81. Dovetail groove; 9. Thrust end; 91. Dovetail-shaped slider; 92. Cylindrical section; 93. Tapered section; 10. Screw; 11. End cap; 12. Spiral scraping edge. Detailed implementation manners

[0017] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0018] In the later stage of oil well or natural gas well exploitation, oil stains, oil scales and wax will condense on the inner wall of the production string. The attachments on the inner wall of the downhole production string with high wax content have a certain viscosity. It is necessary to lower a set of scraping tools to clean the inner wall of the downhole string by lifting and lowering multiple times. However, when entering the subsequent development stage of high-sulfur gas fields, during the flow of high-sulfur natural gas from the bottom of the gas well to the wellhead, the pressure and temperature gradually decrease, and elemental sulfur gradually transforms from the gas phase to the solid phase. As more and more elemental sulfur precipitates, sulfides after mixing with impurities deposit on the inner wall of the oil pipe, eventually leading to the blockage of the oil pipe. The prior art cited in the background technology has a fixed working radius. After being lowered to a certain depth, a part of the sulfur scale with a relatively thick radial deposition thickness is removed. Although it is provided with two sets of scraper assemblies with different outer diameter sizes to cooperate in scraping the sulfur scale on the pipe wall, when the smaller-diameter scraper assembly scrapes the sulfur scale with a relatively thick radial deposition once, the smaller-diameter scraper assembly cannot scrape the sulfur scale with a relatively thin radial deposition thickness at the same well depth at this time. At the same time, the thickness of the sulfur scale deposition at this place may not be sufficient for the other set of scraper assemblies to be lowered for re-scraping, and there may even be a situation of jamming during lowering, resulting in complex operations and extended construction periods.

[0019] Based on such problems, the present invention provides a desulfurization tool with a relatively small outer diameter during lowering, so that it can be lowered to the place where the radial sulfur scale deposition is relatively thick and is not easily jammed. When the desulfurization tool reaches the expected position for desulfurization operation, the outer diameter of the desulfurization tool expands, so as to scrape both the sulfur scale with a relatively thick radial deposition and the sulfur scale with a relatively thin radial deposition at the same production string depth. The desulfurization effect is better and jamming is not likely to occur, and the desulfurization operation efficiency is higher. The desulfurization tool provided by the present invention is not only applicable to scraping the sulfur scale on the inner wall of the production string, but also applicable to wellbore desulfurization, and is also applicable to wax and scale removal operations in the oil well tubing string. And based on the situation that the production string cannot be taken out and replaced during the actual production of the gas field, the present invention is particularly applicable to cleaning the sulfur scale on the inner wall of the gas well production string.

[0020] The overall design concept of a desulfurization tool provided by the present invention is: As Figures 1-5As shown in the figure, a desulfurization tool includes a central rod 3. The upper end of the central rod 3 has a collision-receiving end for withstanding shock operations. A connection structure for connecting to a downhole tool is provided at the collision-receiving end of the central rod 3. The connection structure includes a connection sleeve 2 sleeved on the collision-receiving end of the central rod 3. A cavity for the up-and-down guiding movement of the collision-receiving end of the central rod 3 is provided inside the connection sleeve 2. A connection head 1 for connecting to the downhole tool is also provided at the upper part of the connection cylinder. And in the normal state of the desulfurization tool, the lower end of the connection head 1 is in contact with the upper end of the collision-receiving end of the central rod 3. The lower end of the central rod 3 is a pushing end 9. A desulfurization outer cylinder is slidably sleeved on the outer side of the lower end of the central rod 3. The desulfurization outer cylinder is a conical cylinder with a gradually decreasing diameter from top to bottom, so as to facilitate lifting and lowering, and has a guiding function during the lowering process, saving the time for the desulfurization tool to enter and exit the pipe string; at the same time, a movable scraping member 8 is arranged at the pushing end 9 during the lifting and lowering process. The movable scraping member 8 is in conical surface fit with the pushing end 9. An avoidance groove 71 for the radial floating of the movable scraping member 8 to protrude and retract from the outer cylinder wall of the desulfurization outer cylinder is provided on the desulfurization outer cylinder.

[0021] When performing desulfurization operations on the production pipe string, it is connected to the rope cap in the wireline operation tool string through the connection thread provided on the connection head 1, so as to be lowered into the pipe string through wireline operation. And because the heavy rod in the wireline operation tool string can make this desulfurization tool reach a certain depth to perform desulfurization operations. The present invention can also be connected through coiled tubing. For example, the upper end of a coiled tubing special connection head is connected to the coiled tubing, and the lower end of the coiled tubing special connection head is connected to the desulfurization tool to also perform the lowering for desulfurization operations.

[0022] When the desulfurization tool provided by the present invention is lowered into the production string section with relatively severe sulfur scale deposition, the desulfurization tool no longer continues to move downward. At this time, the circumferential direction of the desulfurization outer cylinder is surrounded by sulfur scale. Then, a shock operation is performed. The impact energy is transmitted from the connector 1 to the central rod 3, so that the central rod 3 moves downward in the connecting sleeve 2. When the top push end 9 moves downward relative to the desulfurization outer cylinder, the movable scraping member 8 can be pushed outwards. The working radius of the movable scraping member 8 for scraping is larger than the working radius of the desulfurization outer cylinder, so that the sulfur scale with different radial deposition thicknesses can be scraped and removed simultaneously through the cooperation of the movable scraping member 8 and the desulfurization outer cylinder. The sulfur scale with different thicknesses can be removed in only one stroke, improving the working efficiency. Moreover, an elastic member 5 that provides elastic acting forces in opposite axial directions to the two is arranged between the desulfurization outer cylinder and the central rod 3. After the movable scraping member 8 protrudes from the desulfurization outer cylinder for scraping, under the restoring action of the elastic member 5, the central rod 3 moves upward to release the action of the top push end 9 on the movable scraping member 8, so that the movable scraping member 8 retracts into the desulfurization outer cylinder. By combining with continuous shock operations for many times, the movable scraping member 8 continuously extends from the desulfurization outer cylinder and cooperates with the desulfurization outer cylinder to scrape the sulfur scale on the inner wall of the production string until the sulfur scale on the inner wall of the production string is scraped clean, and the desulfurization effect is better. The desulfurization tool of the present invention can not only efficiently scrape the sulfur scale in the production string during multiple up-and-down processes, but also, after the scraping operation is completed, under the action of the elastic member 5, the desulfurization tool returns to the initial outer diameter state with a relatively small radial dimension, and it is not easy to cause jamming accidents, and can be smoothly taken out from the production string to complete the scraping operation of the production string, so as to ensure the normal production operation of the gas well.

[0023] Based on the above overall introduction of the present invention, a more specific embodiment is provided on the basis of the overall introduction as follows: As Figures 1-5As shown in the figure, the movable scraping member 8 and the outer desulfurization cylinder are respectively provided with spiral scraping blades 12 in the same direction. The spiral scraping blades 12 are subjected to the radial component force and the axial component force acting on them due to sulfur formation. Under the shock operation, the shock energy is transmitted from the connector 1 to the central rod 3, so that the central rod 3 moves downward to squeeze the elastic member 5. The outer desulfurization cylinder is subjected to a radially downward acting force from the elastic member 5 and rotates due to the spiral scraping blade 12 on the outer desulfurization cylinder to scrape the sulfur scale on the inner wall of the production string. At the same time, since the central rod 3 moves downward, the pushing end 8 pushes the movable scraping member 8 out of the avoidance groove 71 of the outer desulfurization cylinder. Driven by the outer desulfurization cylinder, the movable scraping member 8 is caused to rotate accordingly, and at the same time, the central rod 3 is driven to rotate in the inner cavity of the connecting sleeve 2. The spiral scraping blade 12 on the movable scraping member 8 can cooperate with the spiral scraping blade 12 on the outer desulfurization cylinder to work, and scrape the sulfur scale with different radial deposition thicknesses at the same time. In multiple shock operations, spiral cutting is realized, and the sulfur scale in the production string is scraped off. This kind of scraping along the spiral path with axial rotation and radial movement in the shock operation makes the scraping process smoother, with less resistance and better scraping effect.

[0024] Further, the spiral scraping blade 12 is arranged downward. Specifically, the spiral scraping blade 12 is inclined at an acute angle with the outer wall of the outer desulfurization cylinder and the outer wall of the movable scraping member 8, and the scraping blade tip is downward. In this way, under the shock action, the spiral scraping blade 12 can cut and scrape the sulfur scale with different radial deposition thicknesses in the production string. The scraped sulfur scale falls into the production string, so as to be carried out of the production string through subsequent blowout operations, thereby completing the sulfur scale scraping and ensuring the normal production operation of the gas well. More specifically, the scraping blade is strip-shaped, so that during the process of being shocked and scraping downward, the scraping effect on the sulfur scale is better, and it can better realize scraping off the sulfur scale and making the sulfur scale fall into the production string for subsequent treatment; of course, the scraping blade can also be triangular or other shaped sheet structures.

[0025] More specifically, the elastic member 5 is a return spring. When the shock operation causes the central rod 3 to move downward, the return spring is compressed. During the recovery process of the return spring, the central rod 3 is subjected to an upward acting force provided by the return spring, so that the central rod 3 moves upward to release the action of the pushing end 9 on the movable scraping member 8. The movable scraping member 8 is not affected by the pushing end 9 and retracts into the avoidance groove 71 on the outer wall of the desulfurization sleeve, so that the desulfurization tool is in a state with a smaller outer diameter and can enter or be taken out of the well smoothly. More optimally, as Figure 1 shown, the central rod 3 is screwed with an adjusting nut 4, and both ends of the elastic member are respectively abutted against or fixedly connected to the adjusting nut 4 and the outer desulfurization cylinder. By screwing the adjusting nut 4 to adjust the position of the adjusting nut 4 on the central rod 3, that is, to adjust the distance between the adjusting nut 4 and the outer desulfurization cylinder to change the elastic lifting effect of the elastic member 5 on the central rod 3.

[0026] Based on the above overall introduction of the present invention, or on the basis of the embodiments of the present invention introduced above, the following provides a more specific embodiment on the basis of the overall introduction: This embodiment focuses on the cooperation between the pushing end 9 and the movable scraping member 8 and describes it in detail.

[0027] As Figures 1-5 shown, the pushing end 9 is a conical columnar structure, and the inner side surface of the movable scraping member 8 is inclined and adapted to the outer conical surface of the pushing end 9. Specifically, the two are inclined and fitted together to facilitate the pushing of the pushing end 9 on the movable scraping member 8 on the desulfurization outer cylinder while reducing the initial outer diameter of the desulfurization tool. In other embodiments, the pushing end 9 and the movable scraping member 8 may also have different inclinations, and the movable scraping member 8 can be protruded and retracted in the avoidance groove 71 through the pushing end 9 during the up-and-down movement of the central rod 3.

[0028] The desulfurization outer cylinder is provided with an avoidance groove 71 for the radial floating of the movable scraping member 8 to protrude and retract from the outer wall of the desulfurization outer cylinder. Of course, for the convenience of lowering the desulfurization tool, it is preferred that when the pushing end 9 does not act on the movable scraping member 8, the pushing end 9 is just located in the avoidance groove 71, that is, the outer wall of the pushing end 9 and the outer wall of the movable scraping member 8 form a flat conical surface, which can also prevent the sulfur scale falling off in the production string from entering through the avoidance groove 71 and affecting the use of the desulfurization tool during the up-and-down movement of the desulfurization tool.

[0029] Preferably, the movable scraping member 8 is assembled on the outer wall of the pushing end 9. And to improve the scraping efficiency, the movable scraping member 8 is strip-shaped and extends vertically. An avoidance groove 71 adapted to the movable scraping member 8 is provided on the outer cylinder wall of the desulfurization outer cylinder. At the same time, the groove wall of the avoidance groove 71 stops and limits the movable scraping member 8 axially. And there is a cavity in the desulfurization outer cylinder for the pushing end 9 to move up and down. During the process of the center rod 3 driving the pushing end 9 to move downward by shock, the movable scraping member 8 does not move axially. Instead, during the process of the pushing end 9 moving from top to bottom, the movable scraping member 8 is pushed out of the avoidance groove 71. In another alternative solution, the movable scraping member 8 can also be assembled on the desulfurization outer cylinder. More specifically, the radial dimension of the movable scraping member 8 is adapted to the depth of the avoidance groove 71 on the desulfurization outer cylinder. An elastic member for providing a radially inward acting force to the movable scraping member 8 is configured on the desulfurization outer cylinder, so that the movable scraping member 8 is guided and slidably assembled on the desulfurization outer cylinder. Thus, during the process of the center rod 3 driving the pushing end 9 to move downward, the pushing end 9 acts on the movable scraping member 8, pushing the movable scraping member 8 outwards while the elastic member is stretched. When the center rod 3 moves upward to release the cooperation between the pushing end 9 and the movable scraping member 8, the elastic member recovers, causing the movable scraping member 8 to move radially inwards to return to its original position, so that the desulfurization tool returns to the original outer diameter state with a smaller size. Of course, a plurality of avoidance grooves 71 are axially and evenly spaced on the outer cylinder wall of the desulfurization outer cylinder. Correspondingly, movable scraping members 8 adapted to the avoidance grooves 71 are configured to further improve the scraping effect.

[0030] Certainly, in another more preferred embodiment, the lower part of the avoidance groove 71 on the desulfurization outer cylinder extends to the bottom of the desulfurization outer cylinder. The avoidance groove 71 is of an inverted U-shaped structure. At this time, the length of the avoidance groove 71 is longer, which can be adapted to a longer movable scraping member 8. At this time, a blocking structure needs to be configured to axially block the movable scraping member 8, further increasing the scraping length when the movable scraping member 8 protrudes from the avoidance groove 71, and the desulfurization efficiency is higher. Specifically, the blocking structure includes an end cap 11. A hole is drilled in the bottom wall of the desulfurization outer cylinder, and then the screw 10 passes through the end cap 11 and the bottom of the desulfurization outer cylinder to connect the end cap 11 to the bottom of the desulfurization outer cylinder. In another alternative way, the blocking structure can also include a nut. An adapted external thread is provided on the circumferential outer side of the bottom of the desulfurization outer cylinder, and the nut is screwed to connect the nut to the desulfurization outer cylinder to block the bottom of the desulfurization outer cylinder, preventing the movable scraping member 8 from axially disengaging and affecting the use.

[0031] Further, in order to facilitate the pushing action of the pushing end 9 on the movable scraping member 8 during the up-and-down movement of the pushing end 9 and to prevent the movable scraping member 8 from disengaging from the avoidance groove 71, causing downhole falling object accidents, specifically, the movable scraping member 8 and the pushing end 9 are guided and slidably engaged in the up-and-down direction through a radial anti-disengagement chute on one of them and a matching slider on the other. The groove wall of the avoidance groove 71 axially stops and limits the movable scraping member 8, so that under the action of the pushing end 9, the movable scraping member 8 only moves radially to protrude from and retract into the avoidance groove 71. More specifically, in order to improve the matching stability between the two and ensure the assembly speed of the desulfurization tool, one of the movable scraping member 8 and the pushing end 9 is provided with a dovetail groove 81, and the other is provided with a dovetail-shaped slider 91. The guiding movement between the pushing end 9 and the movable scraping member 8 is realized through the cooperation of the dovetail groove 81 and the dovetail-shaped slider 91. In another more optimized embodiment, to avoid interference when the circumferentially evenly distributed movable scraping members 8 retract, specifically, when the dovetail groove 81 is provided on the movable scraping member 8, the bottom end of the dovetail groove 81 can be thinned, so that the movable scraping member 8 can better retract into the desulfurization outer cylinder when not under the action of the pushing end 9. In other embodiments, the anti-disengagement chute can also be specifically a U-shaped groove. Two relatively thin long grooves are opened on the opposite two side walls of the U-shaped groove along the extending direction of the U-shaped groove. At the same time, two stoppers adapted to the two relatively thin long grooves are provided on the slider. Thus, when the slider is guided and slides in the anti-disengagement chute, the two stoppers on the slider also slide in the two long grooves, further preventing the movable scraping member 8 from disengaging from the avoidance groove 71.

[0032] Based on the above overall introduction of the present invention, or on the basis of the embodiments of the present invention introduced above, the following provides a more specific embodiment on the basis of the overall introduction: This embodiment focuses on the detailed description of the cooperation between the desulfurization outer cylinder and the pushing end 9.

[0033] As Figures 1-5As shown in the figure, the desulfurization outer cylinder is a conical cylinder with a gradually decreasing diameter from top to bottom. It can be an integral structure and is sleeved on the central rod 3. In other embodiments, the desulfurization outer cylinder includes an outer cylinder cap 6 and an outer cylinder main body 7. The outer cylinder cap 6 can move up and down along the central rod 3. The lower end of the outer cylinder cap 6 is provided with an outer cylinder cap connection thread 62 for connecting with the outer cylinder main body 7. During actual assembly, the outer cylinder cap 6 can be first sleeved on the bottom of the central rod 3, and then after the top push end 9 is screwed onto the bottom of the central rod 3, the outer cylinder main body 7 is screwed onto the outer cylinder cap 6 to complete the assembly. Such a setting facilitates the assembly of the desulfurization tool. It also facilitates directly disassembling the outer cylinder main body 7 from the outer cylinder cap 6 after a desulfurization operation is completed, so as to clean the sulfur that has entered the desulfurization outer cylinder during the desulfurization process for use in the next desulfurization operation, and has a longer service life. Specifically, the outer cylinder cap 6 is provided with an inner hole 61 of the outer cylinder cap. The top push end 9 includes a cylindrical section 92 and a conical section 93. The inner diameter of the inner hole 61 of the outer cylinder cap is the same as the outer diameter of the cylindrical section 92. The top push end 9 can move up and down in the inner hole 61 of the outer cylinder cap 6. In other more preferred embodiments, the outer cylinder cap 6 is provided with a chamfer structure to avoid the problem of snagging to a certain extent during the upward lifting process of the desulfurization tool.

[0034] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods.

[0035] In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

[0036] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A desulfurization tool, characterized in that: It includes a central rod. The upper end of the central rod is the impact end, and the lower end is the pushing end. A desulfurization outer cylinder is slidably sleeved on the outer side of the lower end of the central rod in a guiding manner. The desulfurization outer cylinder is a conical cylinder with a gradually decreasing diameter from top to bottom. An active scraping member is arranged at the pushing end. The active scraping member is in conical surface fit with the pushing end. The desulfurization outer cylinder is provided with an avoidance groove for the active scraping member to radially float to protrude from and retract into the outer cylinder wall of the desulfurization outer cylinder. When the pushing end moves downward relative to the desulfurization outer cylinder, the active scraping member can be pushed outwards. An elastic member is arranged between the desulfurization outer cylinder and the central rod to provide elastic acting forces in opposite axial directions to the two, so as to be elastically lifted after the central rod moves to the lowest position during impact.

2. The desulfurization tool according to claim 1, characterized in that: The active scraping member and the desulfurization outer cylinder are respectively provided with spiral scraping edges in the same direction.

3. The desulfurization tool according to claim 2, characterized in that: The spiral scraping edge is arranged downward.

4. The desulfurization tool according to claim 1, wherein: The pushing end is a conical columnar structure, and the inner side surface of the active scraping member is inclined and adapted to the outer conical surface of the pushing end.

5. The desulfurization tool according to any one of claims 1-4, characterized in that: The active scraping member and the pushing end are in guiding sliding fit in the vertical direction through a radial anti-disengagement chute on one of them and a matching slider on the other, and the groove wall of the avoidance groove stops and limits the active scraping member axially.

6. The desulfurization tool according to claim 5, characterized in that: The radial anti-disengagement chute is a dovetail groove, and the slider is a dovetail-shaped slider.

7. The desulfurization tool according to any one of claims 1-4, characterized in that: The active scraping member is strip-shaped and extends vertically.

8. The desulfurization tool according to any one of claims 1-4, characterized in that: The lower part of the avoidance groove on the desulfurization outer cylinder extends to the bottom of the desulfurization outer cylinder. The avoidance groove is of an inverted U-shaped structure and the bottom of the desulfurization outer cylinder has a sealing structure.

9. The desulfurization tool according to any one of claims 1-4, characterized in that: The central rod is screwed with an adjusting nut, and the elastic member abuts between the adjusting nut and the desulfurization outer cylinder.

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