A tubing inner hydraulic rotary sulfur removal tool

Abstract

This invention provides a hydraulic rotary desulfurization tool for oil tubing, including a rotary scraper module. The rotary scraper module includes a scraper housing and multiple variable-diameter scraper blocks. Inside the scraper housing, a mandrel is floatingly supported by a base and an elastic element. Multiple wedge-shaped push blocks are provided outside the mandrel, each with an inclined surface and a dovetail groove. Dovetail blocks are provided inside the variable-diameter scraper blocks, and these dovetail blocks are slidably engaged within the inclined dovetail grooves. When working fluid is input, the mandrel compresses the elastic element downwards under liquid pressure, causing the wedge-shaped push blocks to move downwards. Simultaneously, during the downward movement of the wedge-shaped push blocks, the variable-diameter scraper blocks move outwards circumferentially along the scraper housing under the influence of the inclined surface force of the wedge-shaped push blocks, thus achieving the variable diameter of the rotary scraper module. The beneficial effects of this invention are: it can convert the hydraulic energy of the working fluid into mechanical energy, removing sulfur deposits from the inner wall of the oil tubing, improving the desulfurization efficiency of the oil tubing without damaging the well wall, and ensuring long-term normal production operations of the gas well.

Description

Technical Field

[0001] This invention relates to the field of high-sulfur gas well repair technology, and more specifically, to a hydraulic rotary desulfurization tool for oil tubing. Background Technology

[0002] Sulfur deposition is extremely common and difficult to completely avoid in the extraction of high-sulfur natural gas fields. During extraction, the fluids inside the wellbore often carry sulfides and waxes. Over time, these substances deposit inside the wellbore, not only reducing the well's production efficiency but also potentially damaging equipment, increasing maintenance costs, and in severe cases, even causing wellbore blockage and safety accidents. Therefore, developing efficient tubing desulfurization technology is crucial for ensuring the stable operation of gas wells and extending their service life.

[0003] Traditional desulfurization methods in oil wells primarily rely on chemical treatment. This typically involves injecting specific chemical agents into the wellbore to react with sulfur deposits, which are then carried away by the working fluid. While effective in the early and middle stages of gas field development, this method causes environmental pollution, requires frequent treatment, and is relatively costly. Furthermore, the effectiveness of desulfurizing agents is influenced by various factors such as concentration, temperature, methanol content, pH value, foaming agents, and salinity, making highly efficient desulfurization under demanding conditions.

[0004] To overcome the limitations of existing technologies, a hydraulic rotary desulfurization tool for oil pipes is proposed. This tool aims to provide a mechanical oil pipe desulfurization device and method to achieve high-efficiency and low-cost oil pipe desulfurization. Summary of the Invention

[0005] The purpose of this invention is to address at least one of the aforementioned shortcomings of the prior art. For example, one objective of this invention is to provide a hydraulic rotary desulfurization tool for oil tubing, which addresses the inefficient and costly chemical desulfurization methods of the prior art. By converting the hydraulic energy of the working fluid into mechanical energy, it removes sulfur deposits from the inner wall of the oil tubing, improving the desulfurization efficiency of the oil tubing without damaging the well wall, and ensuring the long-term normal production operation of the gas well.

[0006] To achieve the above objectives, the present invention provides a hydraulic rotary desulfurization tool for oil pipes, including a rotary scraper module; the rotary scraper module includes a scraper housing and multiple variable-diameter scraper blocks; a spindle is floatingly supported inside the scraper housing by an elastic element, and one or more wedge-shaped push blocks are provided outside the spindle. The outer side of the wedge-shaped push blocks is provided with an inclined surface, and an inclined dovetail groove is formed on the inclined surface. The inner side of the variable-diameter scraper blocks is provided with dovetail blocks adapted to the inclined dovetail groove; the scraper housing also has an opening in the middle of the housing adapted to the variable-diameter scraper blocks, so that the variable-diameter scraper blocks can extend radially out of the scraper housing housing from the opening;

[0007] When the mandrel is pressed downwards, it compresses the elastic element and causes the wedge-shaped pusher to move downwards. Simultaneously, during this downward movement, the variable-diameter scraper block moves outwards circumferentially along the scraper housing under the force of the wedge-shaped pusher's inclined surface, thus achieving a variable-diameter change in the scraper size of the rotating scraper module. Conversely, when the mandrel moves upwards under the restoring force of the elastic element, the scraper size changes from large to small.

[0008] In a preferred embodiment of this solution, the scraper housing has a drive shaft at its top for driving its rotation and an inlet for inputting working fluid, and an outlet at its bottom; the mandrel has a channel to allow the working fluid input from the inlet to flow through the channel and be discharged through the outlet; when working fluid is input through the inlet, the mandrel compresses the elastic element downward under liquid pressure. This converts the hydraulic energy of the working fluid into mechanical energy to remove sulfur deposits from the inner wall of the oil pipe.

[0009] In a preferred embodiment of this solution, the liquid inlet is located in the middle of the drive shaft.

[0010] In a preferred embodiment of this solution, the rotary scraper module further includes a diameter-changing control cylinder, which is axially positioned outside the mandrel. An annular curved groove is provided circumferentially along the outer wall of the diameter-changing control cylinder. One end of a lower pin is fitted into the annular curved groove, and the other end of the lower pin is fixed to the inner wall of the scraper housing. The annular curved groove has multiple high and low points. When the mandrel moves downward relative to the scraper housing, the lower pin moves relative to the high point of the annular curved groove, and vice versa, it moves relative to the low point of the annular curved groove. This achieves stable diameter changing.

[0011] In a preferred embodiment of this solution, the high point of the annular curved chute includes multiple first poles and second poles; the first poles and second poles have different heights and are spaced apart. The design of the first poles and second poles enables the variable diameter control cylinder to achieve two-stage variable diameter, and the amount of extension and retraction of the variable diameter scraper block can be achieved by adjusting the working fluid pressure.

[0012] In a preferred embodiment of this solution, the rotary scraper module includes multiple wedge-shaped push blocks; the wedge-shaped push blocks have a fitting hole in the middle, and the mandrel has an upper abutment platform and a lower abutment platform on its outside; the multiple wedge-shaped push blocks are sequentially fitted onto the mandrel, and are axially limited to the middle of the mandrel via the upper abutment platform and the lower abutment platform; the outer periphery of the wedge-shaped push blocks has multiple inclined surfaces, the lower part of the inclined surfaces is inclined towards the axis, and the inclined dovetail groove is inclined along the inclined surface.

[0013] In a preferred embodiment of this solution, the mandrel includes an upper scraper mandrel, a middle scraper mandrel, and a lower scraper mandrel that are detachably connected in sequence. The bottom of the upper scraper mandrel protrudes from the outer wall of the middle scraper mandrel to form an upper abutment platform, and the top of the lower scraper mandrel protrudes from the outer wall of the middle scraper mandrel to form a lower abutment platform. A base is provided inside the scraper housing, and an abutment ring is provided at the top of the upper scraper mandrel. An elastic element is fitted on the upper scraper mandrel and abuts against the abutment ring and the base.

[0014] In a preferred embodiment of this solution, the bottom of the abutment ring is provided with a thrust ball bearing A, and the elastic element is a spring, which abuts between the thrust ball bearing A and the base.

[0015] In a preferred embodiment of this solution, the mandrel further includes a descending sleeve, the bottom of which is connected to the top of the upper mandrel of the scraper; the top wall of the descending sleeve is shaped like an inverted trumpet to increase its contact surface with the working fluid, facilitating the efficient conversion of hydraulic energy into mechanical energy.

[0016] In a preferred embodiment of this solution, the variable diameter control cylinder is mounted on the lower mandrel of the scraper; the upper and lower ends of the variable diameter control cylinder are respectively provided with an upper thrust ball bearing and a lower thrust ball bearing, and the variable diameter control cylinder is rotatably connected to the lower mandrel of the scraper via the upper thrust ball bearing; the lower mandrel of the scraper is also provided with a positioning sleeve, which is located at the bottom of the lower thrust ball bearing to achieve axial positioning of the lower thrust ball bearing.

[0017] In a preferred embodiment of this solution, the hydraulic rotary desulfurization tool in the oil pipe further includes a power module; the power module includes an upper connector with an inlet channel at its top, and a guide cylinder and an upper outer shell are fixedly connected to the bottom of the upper connector, forming a flow cavity between the guide cylinder and the upper outer shell; the upper connector also has multiple side flow channels evenly distributed in a ring around its axis, for connecting the inlet channel and the flow cavity; an impeller cylinder is rotatably connected to the bottom of the guide cylinder, and multiple arc-shaped guide blades are evenly distributed on the outside of the guide cylinder, and multiple arc-shaped rotating blades are evenly distributed on the outer peripheral wall of the impeller cylinder, with the rotating blades and guide blades arranged in opposite directions; the bottom of the impeller cylinder is connected to the drive shaft.

[0018] In a preferred embodiment of this solution, the bottom of the impeller cylinder is connected to an output shaft, and the upper housing is also provided with a sealing component for sealing the bottom of the flow cavity. The bottom of the output shaft passes through the sealing component and is connected to the drive shaft. A central guide cavity is provided in the center of the drive shaft, and multiple inclined holes are provided in the middle of the output shaft. The flow cavity is connected to the central guide cavity through the inclined holes. The bottom end of the central guide cavity is connected to the inside of the scraper housing to form a liquid inlet.

[0019] In a preferred embodiment of this solution, the power module further includes an upper flow divider; the upper flow divider is screwed inside the upper housing, and the top of the upper flow divider is interference-fitted with the bottom of the upper connector; the upper flow divider has multiple vertical through holes corresponding to the side flow channel, and the side flow channel is connected to the flow cavity through the vertical through holes; the bottom of the upper flow divider is fixedly connected to the top of the guide tube.

[0020] In a preferred embodiment of this solution, the sealing component includes a lower distribution plate and a cover plate. The lower distribution plate is sleeved outside the output shaft. The lower distribution plate is a cavity with an annular top plate, and the middle part of the annular top plate is rotatably connected to the bottom of the impeller cylinder. The bottom of the cavity is connected to the cover plate and sealed by the cover plate. Whether the outer wall of the lower distribution plate is in contact with the inner wall of the upper outer shell needs to be fixed is determined by whether the cavity is connected to the central guide cavity through an inclined hole. The annular top plate also has multiple arc-shaped slots to facilitate the flow of working fluid into the annular cavity.

[0021] In a preferred embodiment of this solution, the bottom of the drive shaft is connected to the top of the scraper housing via a spline drive; the top of the drive shaft is provided with an annular step, and a cylindrical roller bearing 1 and a cylindrical roller bearing 2 are sleeved below the annular step. The top of the cylindrical roller bearing 1 is connected to the bottom of the annular step, and a positioning sleeve is rotatably connected between the cylindrical roller bearing 1 and the cylindrical roller bearing 2; a rotary sealing ring is also sleeved between the cylindrical roller bearing 2 and the scraper housing outside the drive shaft; an anti-corrosion sleeve is also sleeved outside the rotary sealing ring, and there is a gap between the anti-corrosion sleeve and the rotary sealing ring.

[0022] In a preferred embodiment of this solution, the two ends of the impeller cylinder are rotatably connected to the guide cylinder and the lower distributor plate via a deep groove ball bearing, respectively.

[0023] In a preferred embodiment of this solution, the upper connector is threaded to the top of the upper outer shell; the upper distributor plate is threaded to the top of the guide tube.

[0024] In a preferred embodiment of this solution, the output shaft and the transmission shaft, as well as the output shaft and the impeller cylinder, are respectively connected by internal and external splines.

[0025] In a preferred embodiment of this solution, the transmission shaft has an O-ring at the bottom of its inner spline to seal the gap between the inner and outer splines.

[0026] In a preferred embodiment of this solution, the lower end of the scraper housing is further provided with a plurality of polycrystalline teeth, and the circumferential surface of the scraper housing is provided with a spiral blade. The polycrystalline teeth are at a certain angle to the scraper housing to facilitate scraping and cutting the sulfur deposits in the oil pipe.

[0027] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0028] (1) This invention provides a hydraulic rotary desulfurization tool for oil pipes, which is equipped with a rotary scraper module. The rotary scraper module includes a scraper shell, a mandrel and multiple variable diameter scraper blocks. The mandrel is floatingly supported inside the scraper shell by a base, and multiple wedge-shaped push blocks are provided outside the mandrel. The outer side of the wedge-shaped push blocks is provided with an inclined surface, and an inclined dovetail groove is opened on the inclined surface. The variable diameter scraper blocks are connected to the wedge-shaped push blocks through the inclined dovetail groove, so that the variable diameter scraper blocks can slide along the inclined surface in a certain track. An opening is opened in the middle of the scraper shell, and the variable diameter scraper blocks can extend radially out of the scraper shell from the opening. When the mandrel moves downward, the variable diameter scraper blocks extend outward in the circumferential direction of the scraper shell under the action of the inclined surface of the wedge-shaped push blocks, so as to realize the variable diameter change of the scraper size of the rotary scraper module from small to large. Thus, this solution can realize the variable diameter of the scraper module.

[0029] (2) In this scheme, the top of the scraper shell is provided with a liquid inlet. The spindle can compress the elastic element downward under liquid pressure and drive the wedge push block to move downward. Thus, this scheme can realize the change of diameter of the rotating scraper module through the hydraulic pressure of the working fluid. That is, the hydraulic energy of the working fluid is converted into mechanical energy to efficiently remove the sulfur deposits on the inner wall of the tubing. While not damaging the well wall, the desulfurization efficiency of the tubing is improved, ensuring the long-term normal production operation of the gas well.

[0030] (3) In this scheme, the hydraulic rotary desulfurization tool in the tubing is also equipped with a diameter control cylinder. The diameter control cylinder is axially positioned outside the mandrel. Its outer wall is provided with an annular curved groove. The annular curved groove has multiple high points and low points set at intervals. One end of the lower pin is slidably clamped in the annular curved groove, and the other end of the lower pin is fixed on the scraper housing. When the mandrel moves downward relative to the scraper housing, the lower pin moves relative to the high point of the annular curved groove, and vice versa. Therefore, the diameter control cylinder moves up and down to realize the movement of the lower pin along a specific track and control the size of the diameter change. Thus, the hydraulic rotary desulfurization tool in the tubing can realize diameter scraping and desulfurization, which can be achieved by other downhole tools such as downhole packers.

[0031] (4) Multiple high points of the annular curved chute can be set as first poles and second poles with different heights, and the first poles and second poles are set at intervals, so that the variable diameter control cylinder can achieve two-stage variable diameter. During the operation, the size of the expansion and contraction of the variable diameter scraper block can be achieved by adjusting the working fluid pressure.

[0032] (5) The lower end of the scraper shell is equipped with polycrystalline teeth at a certain angle, which can scrape hard sulfur deposits. At the same time, the circumferential surface of the scraper shell adopts a spiral blade. When the maximum extension of the variable diameter scraper block is reached, the maximum diameter of the blade is 2-3 mm larger than the diameter of the power module shell and 2-3 mm smaller than the diameter of the inner wall of the oil pipe. This allows it to play a straightening role without scratching the inner wall of the oil pipe. Furthermore, due to the scraping method of its spiral blade, even if there is a certain axial impact and vibration, it will not cause any damage to the well wall. Attached Figure Description

[0033] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 A schematic diagram of an exemplary embodiment of an in-pipe hydraulic rotary desulfurization tool of the present invention is shown.

[0035] Figure 2 A schematic diagram of the core structure of the power module of another exemplary embodiment of the hydraulic rotary desulfurization tool in an oil pipe according to the present invention is shown.

[0036] Figure 3 A schematic diagram of a wedge-shaped pusher structure is shown as an exemplary embodiment of a hydraulic rotary desulfurization tool for oil pipes according to the present invention.

[0037] Figure 4 A schematic diagram of a variable-diameter scraper block structure is shown in an exemplary embodiment of a hydraulic rotary desulfurization tool for oil pipes according to the present invention.

[0038] Figure 5 A schematic diagram of the variable diameter control cylinder structure is shown as an exemplary embodiment of an in-pipe hydraulic rotary desulfurization tool according to the present invention.

[0039] Key reference numerals: 1. Upper connector; 2. Upper outer casing; 3. Upper distributor plate; 4. Guide tube; 5. Impeller tube; 6. Deep groove ball bearing; 7. Lower distributor plate; 8. Cover plate; 9. Output shaft; 10. Drive shaft; 11. O-ring seal; 13. Positioning sleeve; 14. Corrosion-resistant sleeve; 15. Rotary seal; 16. Downward sleeve; 17. Thrust ball bearing A; 18. Elastic element; 19. Scraper upper mandrel; 20. Base; 21. Upper pin; 22. Wedge-shaped push block; 23. Variable diameter scraper 24. Scraper central spindle; 25. Scraper lower spindle; 27. Variable diameter control cylinder; 28. Lower pin; 29. ​​Positioning sleeve B; 30. Scraper outer shell; 301. Arc-shaped groove; 401. Guide vane; 501. Rotating vane; 1201. Cylindrical roller bearing one; 1202. Cylindrical roller bearing two; 2601. Upper thrust ball bearing; 2602. Lower thrust ball bearing; a. Side flow channel; b. Flow cavity; c. Central guide cavity; e. Channel; 3001. Polycrystalline tooth. Detailed Implementation

[0040] In the following description, an in-pipe hydraulic rotary desulfurization tool of the present invention will be explained in detail with reference to exemplary embodiments.

[0041] It should be noted that terms such as "first" and "second" are merely for ease of description and distinction, and should not be interpreted as indicating or implying relative importance. Terms such as "up," "down," "front," "back," "left," "right," "inner," and "outer" are merely for ease of description and to establish relative orientations or positional relationships, and do not indicate or imply that the component referred to must have that specific orientation or position.

[0042] Exemplary Example 1

[0043] refer to Figure 1 , Figure 3 , Figure 4 As shown, a hydraulic rotary desulfurization tool for oil pipes includes a rotary scraper module. The rotary scraper module includes a scraper housing 30 and multiple variable-diameter scraper blocks 23. Inside the scraper housing 30, a mandrel is floatingly supported by a base 20 and an elastic element 18. Multiple wedge-shaped push blocks 22 are provided outside the mandrel. The outer side of the wedge-shaped push blocks 22 has an inclined surface with a dovetail groove. The wedge-shaped push blocks 22 are connected to the variable-diameter scraper blocks 23 through the dovetail groove, allowing the variable-diameter scraper blocks 23 to slide within a certain track. The angle of each variable-diameter scraper block 23 is 90°. An opening is provided in the middle of the scraper housing 30, allowing the variable-diameter scraper blocks 23 to extend radially out of the scraper housing 30 from the opening. When the mandrel moves downward, the variable-diameter scraper blocks 23 extend circumferentially out of the scraper housing 30 under the force of the inclined surface of the wedge-shaped push blocks 22, realizing the variable-diameter change of the scraper size of the rotary scraper module from small to large.

[0044] At the same time, refer to Figure 1 As shown in this exemplary embodiment, the top of the scraper housing 30 is provided with a drive shaft 10 for driving its rotation and an inlet for inputting working fluid. The bottom of the scraper housing 30 is provided with an outlet, and a channel e is opened in the middle of the spindle so that the working fluid input from the inlet can be guided through the channel e and discharged from the outlet. When working fluid is input into the inlet, the spindle compresses the elastic element 18 downward under liquid pressure, and drives the wedge-shaped pusher 22 to move downward. Thus, this solution can realize the diameter change of the rotating scraper module through the hydraulic pressure of the working fluid.

[0045] To achieve stable diameter variation of the rotary scraper module, further reference is made. Figure 1 , Figure 5 As shown in this exemplary embodiment, the rotary scraper module is further provided with a diameter-changing control cylinder 27 axially positioned outside the mandrel. The outer wall of the diameter-changing control cylinder 27 is provided with an annular curved groove. One end of the lower pin 28 is locked in the annular curved groove, and the other end of the lower pin 28 is fixed on the inner wall of the scraper housing 30. The annular curved groove has multiple high points and low points. When the mandrel moves downward relative to the scraper housing 30, the lower pin 28 moves relative to the high point of the annular curved groove, and vice versa. The design of the high and low points can limit the relative movement of the mandrel. Combined with the design of the annular curved groove, it is beneficial to ensure the stable diameter change of the rotary scraper module. Therefore, the diameter-changing control cylinder 27 moves up and down to realize the movement of the lower pin 28 along a specific track and control the size of the diameter change.

[0046] refer to Figure 5 As shown in this exemplary embodiment, optionally, the high point of the annular curved chute includes a plurality of first poles and second poles spaced apart, so that the variable diameter control cylinder 27 can achieve two-stage variable diameter, that is, the amount of extension and retraction of the variable diameter scraper block 23 is achieved by adjusting the magnitude of the working fluid pressure.

[0047] In this exemplary embodiment, the scraper housing 30 is provided with a plurality of lower pins 28. During the process of the spindle moving up or down relative to the scraper housing 30, the plurality of lower pins 28 move up and down synchronously in the annular curved groove to ensure stable diameter change.

[0048] More preferably, in this exemplary embodiment, 7 groups of 14 wedge-shaped pushers 22 are coaxially arranged on the mandrel; Reference Figure 1 , Figure 3 As shown, the wedge-shaped pusher 22 has a fitting hole in the middle, and the mandrel has an upper abutment platform and a lower abutment platform on the outside; multiple wedge-shaped pushers 22 are sequentially fitted onto the mandrel and are axially limited to the middle of the mandrel by the upper abutment platform and the lower abutment platform; the outer periphery of the wedge-shaped pusher 22 is evenly provided with three inclined surfaces, the lower part of the inclined surface is inclined towards the axis, and the inclined dovetail groove is inclined along the inclined surface.

[0049] Further, refer to Figure 1 As shown, in this scheme, the mandrel includes a downward sleeve 16, an upper scraper mandrel 19, a middle scraper mandrel 24, and a lower scraper mandrel 25, and the downward sleeve 16, the upper scraper mandrel 19, the middle scraper mandrel 24, and the lower scraper mandrel 25 are detachably connected in sequence. The bottom of the upper scraper mandrel 19 protrudes from the outer wall of the middle scraper mandrel 24 to form an upper abutment platform, and the top of the lower scraper mandrel 25 protrudes from the outer wall of the middle scraper mandrel 24 to form a lower abutment platform. The upper scraper mandrel 19 is threadedly connected to the downward sleeve 16, and in order to ensure that the mandrel can move effectively downward under the action of hydraulic energy, the top wall of the downward sleeve 16 is designed in an inverted trumpet shape, which effectively increases its contact surface with the working fluid and increases the force-bearing area of ​​the mandrel.

[0050] In this exemplary embodiment, the top of the upper spindle 19 of the scraper is provided with an abutment ring, the base 20 is inserted with an upper pin 21 to achieve complete positioning, and the elastic element is fitted on the upper spindle 19 of the scraper and abuts between the abutment ring and the base 20.

[0051] refer to Figure 1 As shown in this exemplary embodiment, the elastic element 18 is a spring, and a thrust ball bearing A17 is provided at the bottom of the abutment ring. The spring abuts between the bottom of the thrust ball bearing A17 and the top of the base 20.

[0052] refer to Figure 1 As shown in this exemplary embodiment, the variable diameter control cylinder 27 is mounted on the lower mandrel 25 of the scraper; and the upper and lower ends of the variable diameter control cylinder 27 are respectively provided with an upper thrust ball bearing 2601 and a lower thrust ball bearing 2602. The upper part of the upper thrust ball bearing 2601 is connected to the lower mandrel 25 of the scraper, and the lower part is connected to the top of the variable diameter control cylinder 27, so that the variable diameter control cylinder 27 can be rotatably connected to the lower mandrel 25 of the scraper via the upper thrust ball bearing 2601; the bottom of the lower thrust ball bearing 2602 is axially positioned by a positioning sleeve 29, and the positioning sleeve 29 and the lower mandrel 25 of the scraper are interference-fitted.

[0053] Optionally, in this exemplary embodiment, the lower end of the scraper housing 30 is further provided with a plurality of polycrystalline teeth 3001. The polycrystalline teeth 3001 are at a certain angle to the scraper housing 30. The polycrystalline teeth can scrape and cut harder sulfur deposits. At the same time, the circumferential surface of the scraper housing adopts a spiral blade. When the variable diameter scraper block extends to its maximum extent, the maximum diameter of the blade is 2-3 mm larger than the diameter of the power module housing and 2-3 mm smaller than the diameter of the inner wall of the oil pipe. This allows it to play a straightening role without scratching the inner wall of the oil pipe.

[0054] Exemplary Example 2

[0055] This exemplary embodiment is based on exemplary embodiment 1, with the addition of a power module to drive the rotation of the rotary scraper module.

[0056] For details, please refer to Figure 1 , Figure 2 As shown, the power module includes an upper connector 1, a guide tube 4, and an upper outer shell 2. The upper connector 1 is provided with a liquid inlet channel at the top. The guide tube 4 and the upper outer shell 2 are located below the upper connector 1, and a flow cavity b is formed between the guide tube 4 and the upper outer shell 2. The upper connector 1 is also provided with multiple side flow channels a that are evenly distributed in a ring around its axis. The liquid inlet channel can be connected to the flow cavity b through the multiple side flow channels a.

[0057] Meanwhile, an impeller cylinder 5 is rotatably connected to the bottom of the guide cylinder 4. The guide cylinder 4 is uniformly welded with 14 guide blades 401 of a certain arc shape in the circumferential direction, and the impeller cylinder 5 is welded with 14 rotating blades 501 of opposite arc shape in the circumferential direction. During operation, after the working fluid enters the flow chamber b, it can be diverted through multiple side flow channels a. After being diverted, the working fluid is guided by the guide blades 401 and impacts the rotating blades 501, thereby driving the impeller cylinder 5 to rotate. The impeller cylinder 5 drives the drive shaft 10 to rotate, which in turn drives the rotating scraper module connected to the drive shaft 10 to rotate.

[0058] Further, refer to Figure 1 , Figure 2 As shown in this exemplary embodiment, the arcs of the guide vanes 401 on the guide tube 4 and the rotating vanes 501 on the impeller tube 5 are specially designed to accelerate the flow rate of the working fluid, increase the rotation speed of the rotating vanes 501, and achieve efficient energy conversion.

[0059] While the working fluid drives the power module to generate torque, this exemplary embodiment also utilizes the hydraulic pressure of the working fluid to adjust the diameter of the rotary diameter-changing module. That is, this exemplary embodiment further refines the transmission connection structure between the power module and the rotary diameter-changing module, so that the working fluid driving the impeller cylinder 5 to rotate is further introduced into the scraper housing 30 to adjust the diameter of the rotary diameter-changing module.

[0060] For details, please refer to Figure 1 As shown in this exemplary embodiment, the bottom of the impeller cylinder 5 is connected to an output shaft 9. The upper housing 2 is provided with a sealing member for sealing the bottom of the flow chamber b. The bottom of the output shaft 9 passes through the sealing member and is connected to the drive shaft 10. The output shaft 9 and the drive shaft 10 are connected by internal and external splines, respectively. The drive shaft 10 has a central guide cavity c, and the output shaft 9 has multiple inclined holes in the middle. The flow chamber b is connected to the central guide cavity c through the inclined holes. The bottom end of the central guide cavity c is connected to the inside of the scraper housing 30 to form a liquid inlet, so that the working fluid can be input into the scraper housing from the liquid inlet. Then, the spindle can move downward under the liquid pressure of the working fluid, driving the diameter change of the rotating scraper module.

[0061] In one specific embodiment, since the production gas well tubing is equipped with tools such as separators and downhole alarms, the diameter of the tools lowered into the tubing is further restricted. When the hydraulic rotary desulfurization tool is lowered into the tubing and passes through the downhole alarm and separator, no working fluid is injected at this time, and the diameter-changing scraper module is in a "contracted" state. After passing through, working fluid is injected, and the diameter-changing scraper is in an "extended" state, realizing diameter change. At the same time, by adjusting the pump pressure, the rotation speed of the rotary scraper can be adjusted to adjust the scraping force. When the pump pressure is greater than 5MPa, the lower pin 28 moves along the diameter-changing control cylinder 27 to the first extreme point, realizing the first stage of diameter change. After the diameter change, the tool diameter increases by 6-8mm. When the pump pressure is greater than 8MPa, the lower pin 28 moves along the diameter-changing control cylinder 27 to the second extreme point, realizing the second stage of diameter change. After the diameter change, the tool diameter increases by 12-14mm.

[0062] The hydraulic rotary desulfurization tool is lowered down into the well via coiled tubing. Since the precipitation of sulfur deposits decreases from the bottom of the well to the wellhead, the sulfur deposits near the wellhead are relatively soft and can be removed by impact at a certain lowering speed. As the well depth increases, the sulfur deposits become harder, at which point working fluid is pumped in to perform rotary scraping to remove the sulfur.

[0063] Furthermore, in this plan, reference is made to... Figure 1 , Figure 2 As shown, the sealing component includes a lower diverter plate 7 and a cover plate 8. The lower diverter plate 7 is a cavity with an annular top plate and is sleeved outside the output shaft 9. The middle part of the annular top plate of the lower diverter plate 7 is rotatably connected to the bottom of the impeller cylinder 5, and the annular top plate has three arc-shaped slots 301, so that the working fluid can flow into the cavity from the arc-shaped slots 301. The bottom of the cavity of the lower diverter plate 7 is connected to the cover plate 8 and sealed by the cover plate 8. The outer wall of the lower diverter plate 7 is in contact with the inner wall of the upper outer shell 2, and the interior of the cavity of the lower diverter plate 7 is connected to the central guide cavity c through an inclined hole.

[0064] In this exemplary embodiment, the bottom of the drive shaft 10 is connected to the top of the scraper housing 30 via a spline drive; the top of the drive shaft 10 is also provided with an annular step, and cylindrical roller bearing 1201 and cylindrical roller bearing 1202 are sleeved below the annular step to facilitate the rotation of the drive shaft 10 and bear a certain axial load. The top of cylindrical roller bearing 1201 is connected to the bottom of the annular step, and the cylindrical roller bearing 1201 and cylindrical roller bearing 1202 are fixed in position by a positioning sleeve 13.

[0065] In this exemplary embodiment, there is a certain gap between the upper outer shell 2 and the rotating scraper module to keep the outer shell stationary. A rotating sealing ring 15 is provided between the bottom of the cylindrical roller bearing 1202 and the top of the scraper outer shell 30. An anti-corrosion sleeve 14 is fitted outside the rotating sealing ring 15. The rotating sealing ring 15 and the drive shaft 10 are interference-fitted. The anti-corrosion sleeve 14 is coaxial with the rotating sealing ring 15 and there is a certain gap between them.

[0066] In this exemplary embodiment, the rotary seal 15 is a dynamic seal, which always rotates synchronously with the drive shaft 10 and is in close contact with the drive shaft 10 during rotation to prevent the entry of external working fluid.

[0067] Furthermore, in this solution, the power module also includes an upper distribution plate 3; the upper connector 1 is threadedly connected to the top of the upper outer shell 2, the upper distribution plate 3 is sealed to the upper outer shell 2, the bottom of the upper distribution plate 3 is threadedly connected to the top of the guide tube 4, and the top of the upper distribution plate 3 is interference-fitted with the bottom of the upper connector 1; the upper distribution plate 3 has multiple vertical through holes corresponding to the side flow channel a, and the side flow channel a is connected to the flow cavity b through the vertical through holes.

[0068] In this exemplary embodiment, the two ends of the impeller cylinder 5 are rotatably connected to the guide cylinder 4 and the lower distributor plate 7 via a deep groove ball bearing 6, respectively.

[0069] In this exemplary embodiment, the drive shaft 10 has an O-ring 11 at the bottom of its inner spline to seal the gap between the inner and outer splines, protect the bearing, and prevent the working fluid from flowing out of the gap.

[0070] In a preferred embodiment, the in-tubular hydraulic rotary desulfurization tool, in conjunction with a high-precision wellbore sulfur deposition influencing factor visualization testing device and method (application number: CN201810814594.8) and other related patented technologies and methods, can calculate the critical suspension velocity of sulfur and the minimum sulfur-carrying gas production under different conditions based on specific well conditions, and accurately lower it to perform rotary scraping to remove sulfur, resulting in higher removal efficiency.

[0071] The working principle of a hydraulic rotary desulfurization tool in an oil pipe: During operation, the working fluid is pumped into the hydraulic rotary desulfurization tool in the oil pipe, flows in through the upper connector 1, passes through the side flow channel a of the upper connector 1 and then through the upper distribution plate 3. Subsequently, it is guided by the guide vanes 401 of the guide cylinder 4. The working fluid accelerates and impacts the rotating vanes 501 on the impeller cylinder 5, enabling the impeller cylinder 5 to achieve a high rotational speed. The torque is transferred to the output shaft 9 and the drive shaft 10 through the output shaft 9, causing the rotary scraper module to rotate, and the working fluid enters the rotary... After the scraper module is rotated, the downward sleeve 16 moves downward. Due to the cooperation between the downward sleeve 16, the upper scraper spindle 19, the middle scraper spindle 24, and the lower scraper spindle 25, the downward sleeve 16, the upper scraper spindle 19, the middle scraper spindle 24, and the lower scraper spindle 25 move downward synchronously. At the same time, under the action of the inclined force of the wedge-shaped push block 22, the variable diameter scraper block 23 extends outward in the circumference, and the lower pin 28 moves along the trajectory of the variable diameter control cylinder 27 to achieve stable variable diameter, thus realizing the variable diameter hydraulic rotation desulfurization operation.

[0072] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A hydraulic rotary desulfurization tool for oil pipes, characterized in that, Includes a rotary scraper module; The rotary scraper module includes a scraper housing (30) and multiple variable diameter scraper blocks (23); The scraper housing (30) has a core shaft floatingly supported by an elastic element (18) inside. One or more wedge-shaped push blocks (22) are provided outside the core shaft. The wedge-shaped push blocks (22) have an inclined surface on the outside. An inclined dovetail groove is opened on the inclined surface. The variable diameter scraper block (23) has a dovetail block inside that is adapted to the inclined dovetail groove. The scraper housing (30) also has an opening in the middle of the housing that is compatible with the variable diameter scraper block (23), so that the variable diameter scraper block (23) can extend radially out of the scraper housing (30) from the opening; When the mandrel is pressed downward, it compresses the elastic element (18) downward and drives the wedge-shaped push block (22) to move downward. At the same time, during the downward movement of the wedge-shaped push block (22), the variable diameter scraper block (23) moves outward along the circumference of the scraper shell (30) under the action of the inclined force of the wedge-shaped push block (22), thereby realizing the variable diameter change of the scraper size of the rotating scraper module from small to large.

2. The hydraulic rotary desulfurization tool for oil pipes according to claim 1, characterized in that, The scraper housing (30) has a drive shaft (10) at its top for driving its rotation and an inlet for inputting working fluid, and an outlet at its bottom; The mandrel has a channel (e) so that the working fluid input from the inlet can be guided through the channel (e) to the outlet for discharge; When working fluid is introduced into the inlet, the spindle compresses the elastic element (18) downward under the liquid pressure.

3. The hydraulic rotary desulfurization tool for oil pipes according to claim 2, characterized in that, The liquid inlet is located in the middle of the drive shaft (10).

4. The hydraulic rotary desulfurization tool for oil pipes according to claim 2, characterized in that, The rotary scraper module also includes a variable diameter control cylinder (27), which is axially positioned outside the mandrel; On the variable diameter control cylinder (27), an annular curved groove is provided along its outer wall circumferentially. One end of the lower pin (28) is locked in the annular curved groove, and the other end of the lower pin (28) is fixed on the inner wall of the scraper housing (30). The annular curved groove has multiple high and low points. When the mandrel moves downward relative to the scraper housing (30), the lower pin (28) moves relative to the high point of the annular curved groove, and vice versa.

5. The hydraulic rotary desulfurization tool for oil pipes according to claim 4, characterized in that, The high points of the annular curved groove include multiple first poles and second poles; The first pole and the second pole have different heights and are set at intervals.

6. The hydraulic rotary desulfurization tool for oil pipes according to claim 4, characterized in that, The rotary scraper module includes multiple wedge-shaped push blocks (22); The wedge-shaped pusher (22) has a fitting hole in the middle, and the mandrel has an upper abutment platform and a lower abutment platform on the outside; Multiple wedge-shaped push blocks (22) are sequentially mounted on the mandrel and axially limited to the middle of the mandrel via the upper and lower abutment platforms; The wedge-shaped pusher (22) has multiple inclined surfaces on its outer periphery, with the lower part of the inclined surface tilted towards the axis, and the inclined dovetail groove is inclined along the inclined surface.

7. The hydraulic rotary desulfurization tool for oil pipes according to claim 6, characterized in that, The mandrel includes an upper scraper mandrel (19), a middle scraper mandrel (24), and a lower scraper mandrel (25) that are detachably connected in sequence. The bottom of the upper scraper mandrel (19) protrudes from the outer wall of the middle scraper mandrel (24) to form an upper abutment platform, and the top of the lower scraper mandrel (25) protrudes from the outer wall of the middle scraper mandrel (24) to form a lower abutment platform. The scraper housing (30) has a base inside, and the top of the scraper upper spindle (19) has an abutment ring. The elastic element (18) is fitted on the scraper upper spindle (19) and abuts between the abutment ring and the base (20).

8. The hydraulic rotary desulfurization tool for oil pipes according to claim 7, characterized in that, The bottom of the abutment ring is provided with a thrust ball bearing A (17), and the elastic element (18) is a spring, which abuts between the thrust ball bearing A (17) and the base (20).

9. The hydraulic rotary desulfurization tool for oil pipes according to claim 7, characterized in that, The mandrel also includes a descending sleeve (16), the bottom of which is connected to the top of the upper mandrel (19) of the scraper; The top wall of the downsleeve (16) is shaped like an inverted trumpet to increase its contact surface with the working fluid.

10. The hydraulic rotary desulfurization tool for oil pipes according to claim 7, characterized in that, The variable diameter control cylinder (27) is fitted onto the scraper lower spindle (25); The upper and lower ends of the variable diameter control cylinder (27) are respectively provided with an upper thrust ball bearing (2601) and a lower thrust ball bearing (2602). The variable diameter control cylinder (27) is rotatably connected to the scraper lower spindle (25) via the upper thrust ball bearing (2601). The scraper lower spindle (25) is also provided with a positioning sleeve (29), which is located at the bottom of the lower thrust ball bearing (2602) to achieve axial positioning of the lower thrust ball bearing (2602).

11. A hydraulic rotary desulfurization tool for oil pipes according to any one of claims 1 to 10, characterized in that, The hydraulic rotary desulfurization tool inside the oil pipe also includes a power module; The power module includes an upper connector (1) with a liquid inlet channel on its top. The upper connector (1) is fixedly connected to a guide tube (4) and an upper outer shell (2) at the bottom. A flow passage cavity (b) is formed between the guide tube (4) and the upper outer shell (2). The upper connector (1) is also provided with multiple side flow channels (a) evenly distributed in a ring around its axis, for connecting the liquid inlet channel and the flow chamber (b); The bottom of the guide tube (4) is rotatably connected to the impeller tube (5). Multiple arc-shaped guide blades (401) are uniformly arranged on the outside of the guide tube (4). Multiple arc-shaped rotating blades (501) are uniformly arranged on the outer peripheral wall of the impeller tube (5). The rotating blades (501) and the guide blades (401) are arranged in opposite directions. The bottom of the impeller cylinder (5) is connected to the drive shaft (10) for transmission.

12. The hydraulic rotary desulfurization tool for oil pipes according to claim 11, characterized in that, The bottom of the impeller cylinder (5) is connected to the output shaft (9), and the upper outer shell (2) is also provided with a sealing component for sealing the bottom of the flow cavity (b). The bottom of the output shaft (9) passes through the sealing component downward and is connected to the drive shaft (10). The drive shaft (10) has a central guide cavity (c) at its center, and the output shaft (9) has multiple inclined holes in its middle. The flow passage (b) is connected to the central guide cavity (c) through the inclined holes. The bottom end of the central guide cavity (c) is connected to the inside of the scraper housing (30) to form a liquid inlet.

13. The hydraulic rotary desulfurization tool for oil pipes according to claim 11, characterized in that, The power module also includes an upper distribution plate (3); The upper distributor plate (3) is screwed inside the upper outer shell (2), and the top of the upper distributor plate (3) is interference-fitted with the bottom of the upper connector (1); The upper flow distribution plate (3) has multiple vertical through holes corresponding to the side flow channel (a), and the side flow channel (a) is connected to the flow cavity (b) through the vertical through holes; The bottom of the upper distribution plate (3) is fixedly connected to the top of the guide tube (4).

14. The hydraulic rotary desulfurization tool for oil pipes according to claim 13, characterized in that, The sealing component includes a lower flow divider (7) and a cover plate (8), with the lower flow divider (7) sleeved outside the output shaft (9); The lower diverter plate (7) is a cavity with an annular top plate, and the middle part of its annular top plate is rotatably connected to the bottom of the impeller cylinder (5). The bottom of its cavity is connected to the cover plate (8) and sealed by the cover plate (8). The outer wall of the lower distribution plate (7) is in contact with the inner wall of the upper outer shell (2), and its cavity is connected to the central guide cavity (c) through an inclined hole; The annular top plate is also provided with multiple arc-shaped slots (301).

15. The hydraulic rotary desulfurization tool for oil pipes according to claim 13, characterized in that, The bottom of the drive shaft (10) is connected to the top of the scraper housing (30) via a spline drive; The top of the drive shaft (10) is provided with an annular step, and cylindrical roller bearing 1 (1201) and cylindrical roller bearing 2 (1202) are sleeved below the annular step. The top of cylindrical roller bearing 1 (1201) is connected to the bottom of the annular step, and a positioning sleeve (13) is rotatably connected between cylindrical roller bearing 1 (1201) and cylindrical roller bearing 2 (1202). A rotary seal ring (15) is also fitted between the cylindrical roller bearing 2 (1202) and the scraper housing (30) outside the drive shaft (10); The rotating sealing ring (15) is also fitted with an anti-corrosion sleeve (14), and there is a gap between the anti-corrosion sleeve (14) and the rotating sealing ring (15).

16. The hydraulic rotary desulfurization tool for oil pipes according to claim 13, characterized in that, The output shaft (9) is connected to the transmission shaft (10) and the impeller cylinder (5) via internal and external splines respectively.

17. The hydraulic rotary desulfurization tool for oil pipes according to claim 13, characterized in that, The drive shaft (10) has an O-ring at the bottom of its inner spline to seal the gap between the inner and outer splines.

18. The hydraulic rotary desulfurization tool for oil pipes according to claim 13, characterized in that, The lower end of the scraper housing (30) is also provided with a plurality of polycrystalline teeth (3001), and the circumferential surface of the scraper housing is provided with a spiral blade.

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