High-sulfur-content gas well shaft sulfur deposition removing device and removing method thereof

Abstract

The invention discloses a high-sulfur-content gas well shaft sulfur deposition clearing device and a clearing method.The clearing device comprises a power pipe section, a clearing pipe section and a detection pipe section, a rotary propelling mechanism is arranged on the power pipe section, and the upper end of the clearing pipe section is connected with the output end of the rotary propelling mechanism; scraping blades and a solvent spraying assembly are arranged on the circumferential outer wall of the cleaning pipe section, the solvent spraying assembly is located below the scraping blades, the detection pipe section and the lower end of the cleaning pipe section are coaxially fixed, a detection assembly is arranged on the detection pipe section, and the detection assembly comprises a supporting shaft, a detection rod, a fixing rod, an elastic telescopic rod, a detection module and a control system. Advanced detection can be carried out on sediments before removal through the arranged detection assembly, so that the control system can pre-judge whether the sediments attached to the shaft are within the range of safe scraping removal capacity or not, if the sediments exceed the range of safe scraping removal capacity, the combined operation of chemical softening and mechanical scraping is achieved, waste of chemical agents is reduced, and pollution is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas well exploitation, and particularly relates to a high-sulfur gas well wellbore sulfur deposition removal device and a removal method thereof. BACKGROUND

[0002] For oil and gas fields rich in hydrogen sulfide in the exploitation medium, such as the Puguang gas field in Zhongyuan oilfield, there is a serious sulfur deposition problem in the production process. Under the combined action of temperature, pressure and fluid flow state in the wellbore, elemental sulfur will continuously precipitate and adsorb on the pipe wall and the surface of downhole tools, forming a deposition in a sludge state. As the gas field development enters the middle and late stages, the drop in formation pressure exacerbates this process, causing sulfur deposition to spread from the gathering system to the deep wellbore, resulting in a continuous decrease in the effective flow diameter, and eventually causing wellbore plugging. If this problem cannot be timely and effectively addressed, it will directly lead to a sharp reduction in gas well productivity or even complete shutdown, seriously affecting the long-term stable production and economic benefits of the gas field.

[0003] Traditional management of wellbore sulfur deposition mainly relies on two technical routes of mechanical cleaning and chemical plugging removal. Mechanical cleaning refers to placing mechanical tools, such as rotary scrapers, into the wellbore to directly remove sulfur scale on the pipe wall through physical scraping. Its advantage is that it can directly remove physical plugging, but it requires high tool strength. For hard composite deposits formed by mixing with inorganic salt scale, the speed and torque of the scraper need to be adjusted according to the thickness and hardness of the deposits, otherwise there will be problems of impact overload and jamming; chemical plugging removal refers to injecting special sulfur-dissolving agents into the wellbore to chemically react with sulfur deposition to achieve dissolution and removal. Its advantage is that it can handle irregular plugging, but for deep, thick and dense sulfur plugs, the sulfur-dissolving agent is difficult to effectively penetrate and uniformly act.

[0004] In view of the respective shortcomings of the two, some advanced technologies also use a combined cleaning operation mode that combines mechanical and chemical methods. First, acid or sulfur-dissolving agent is pumped into the wellbore for soaking and dissolution, and then scraping tools are lowered to completely scrape off the dissolved and softened deposits. The combination of chemical softening can avoid the impact overload and jamming problems caused by the use of mechanical cleaning alone for hard composite deposits, and the combination of mechanical scraping operation can assist in completely removing the deposits that are difficult to penetrate and uniformly act in the chemical softening process. However, this combined cleaning operation mode still has some defects. It lacks real-time sensing capability for the hardness and thickness of the downhole deposits, making it difficult to use corresponding means for precise removal of deposits in different positions and states, but instead relies on the use of chemical agents for softening and plugging removal before performing overall scraping and cleaning operations. For some soft deposits attached in some positions, the overuse of sulfur-dissolving agents not only causes waste, but also poses the risk of contamination of the production layer due to the injection of a large amount of liquid. SUMMARY

[0005] The purpose of the present application is to provide a high-sulfur gas well wellbore sulfur deposition removal device and its removal method to solve the problem that it is difficult to remove the sulfur deposition according to the hardness and thickness of the deposition when the composite removal operation is performed.

[0006] The technical scheme of the present application is: A high-sulfur gas well wellbore sulfur deposition removal device, comprising a power pipe section, a cleaning pipe section and a detection pipe section, a rotating propulsion mechanism is arranged on the power pipe section, the upper end of the cleaning pipe section is connected with the output end of the rotating propulsion mechanism, a scraping blade and a solvent spraying assembly are arranged on the circumferential outer wall of the cleaning pipe section, and the solvent spraying assembly is located below the scraping blade, the detection pipe section is coaxially fixed with the lower end of the cleaning pipe section, a detection assembly is arranged on the detection pipe section, the detection assembly comprises a support shaft, a detection rod, a fixed rod, an elastic telescopic rod, a detection module and a control system, the support shaft is vertically connected in a slot, the slot is arranged on the side wall of the detection pipe section, one end of the detection rod is rotatably connected with the support shaft, one end of the fixed rod is fixed with the support shaft, the elastic telescopic rod is connected between the fixed rod and the detection rod, the detection module is arranged on the elastic telescopic rod, and the control system is electrically connected with the detection module, the rotating propulsion mechanism and the solvent spraying assembly, when the detection rod contacts the deposition and moves, the control system detects whether the compression change amount of the elastic telescopic rod pressed by the deposition reaches a set threshold value to judge whether the hardness and thickness of the deposition exceed the scraping safety operation requirement, when the threshold value is less than the threshold value, the rotating propulsion mechanism drives the scraping blade to perform a separate physical removal operation in the cleaning process, and when the threshold value is greater than the threshold value, the solvent spraying assembly sprays a sulfur dissolving agent to perform a chemical softening operation, and then the scraping blade performs a physical removal operation.

[0007] Preferably, as a further improvement of the present application, the elastic telescopic rod comprises a cylinder, a sliding rod and a spring, the cylinder is in an arc shape and is concentrically arranged with the support shaft, one end of the cylinder is fixedly connected with the fixed rod, the sliding rod is matched with the shape of the cylinder, one end of the sliding rod is slidably connected in the cylinder, the other end of the sliding rod is fixed with the detection rod, and the spring is arranged in the cylinder and has two ends respectively connected with the fixed rod and the sliding rod.

[0008] Preferably, as a further improvement of the present application, the detection module is a magnetic switch, comprising a magnetic induction element and a magnet, the magnetic induction element is embedded on the inner wall of the cylinder, and the magnet is embedded on the inner wall of the sliding rod, when the magnet moves to the position opposite to the magnetic induction element in the compression process, the magnetic induction element senses and transmits a signal to the control system for control.

[0009] Preferably, as a further improvement of the present application, the detection assembly further comprises a rotating part, the rotating part comprises a first hydraulic cylinder and a nut seat, the first hydraulic cylinder is connected inside the detection pipe section, the nut seat is fixed with the piston rod end of the first hydraulic cylinder through a first connecting rod, the support shaft is a screw rod, and the two ends of the screw rod are rotationally connected with the upper and lower sidewalls of the slot, and the nut seat is sleeved and connected on the screw rod.

[0010] Preferably, as a further improvement of the present application, the slot is arc-shaped, the shape of the detection rod matches the slot, and the end face of the end of the detection rod away from the support shaft is a spherical surface, and the inner arc surface of the detection rod is fixed with the end of the sliding rod.

[0011] Preferably, as a further improvement of the present application, the cleaning pipe section is provided with a sealing assembly, the sealing assembly comprises two sealing sleeves, a sealing rubber sleeve, two partition plates, a gas injection pipe and a piston; the two sealing sleeves are symmetrically fixed on the outer pipe wall of the cleaning pipe section; the sealing rubber sleeve is sealingly fixed between the two sealing sleeves; the two partition plates are fixedly sleeved inside the cleaning pipe section and located on the upper and lower sides of the sealing rubber sleeve, so as to form an inflation cavity in the cleaning pipe section, a connecting hole for inflating the sealing rubber sleeve is formed in the circumferential sidewall of the cleaning pipe section, the partition plate on the lower side is provided with a pressure relief port, and the first hydraulic cylinder is fixed at the bottom of the partition plate on the lower side; one end of the gas injection pipe is connected with an external gas conveying assembly, and the other end of the gas injection pipe extends into the inflation cavity; the piston is slidingly connected in the pressure relief port, and the bottom of the piston is fixed with the piston rod of the first hydraulic cylinder through a second connecting rod.

[0012] Preferably, as a further improvement of the present application, the rotating propulsion mechanism comprises a fixed part, a second hydraulic cylinder and a hollow shaft motor; the fixed part is fixed at the upper end of the power pipe section; the cylinder body of the second hydraulic cylinder is fixed with the fixed part, and the output end of the second hydraulic cylinder is connected with a moving seat; the hollow shaft motor is fixed on the moving seat, the hollow shaft of the hollow shaft motor extends into the cleaning pipe section and is fixed with the inner wall of the cleaning pipe section, and the gas injection pipe is arranged in the hollow shaft.

[0013] Preferably, as a further improvement of the present application, the solvent spraying assembly comprises a plurality of spray heads and a conveying pipe, the plurality of spray heads are uniformly fixed on the circumferential sidewall of the cleaning pipe section and located above the sealing rubber sleeve, and the conveying pipe is arranged in the gas injection pipe, one end of the conveying pipe is connected with an external liquid conveying assembly, and the other end of the conveying pipe extends below the gas injection pipe and is connected with the plurality of spray heads through a multi-way pipe.

[0014] The present application also discloses a high-sulfur gas well wellbore sulfur deposition removal method, which is realized by using the removal device. The removal device is placed into the wellbore to be removed; The control rotation propulsion mechanism drives the cleaning pipe section and the detection pipe section to rotate downwards a certain distance, which is equal to the vertical distance between the scraping blade and the detection rod; During the downward spiraling movement of the probe section, the thickness and hardness of the sediment are detected by contact between the probe rod and the sediment. As the probe rod follows the spiraling movement of the probe section, the compression change of the elastic telescopic rod under the pressure of the sediment is detected by the detection module. When the compression change under the pressure of the sediment is less than the set compression change, the control system determines that the current sediment can be directly mechanically removed. When the compression change under the pressure of the sediment is greater than the set compression change, the control system determines that the current sediment needs to be softened before mechanical removal. After the current inspection is completed, the control rotary propulsion mechanism drives the cleaning section and the detection section to continue moving downwards by the same distance. During the movement, the cleaning section performs the corresponding cleaning process according to the results of the previous inspection by the detection rod, and the detection section performs the inspection process for the deposits attached to the next area of ​​the wellbore during the movement. Repeat the above process until the entire area of ​​the wellbore to be cleaned is cleared.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 0. The detection components can perform advance detection before cleaning, converting unknown downhole conditions into quantifiable electrical signals. This allows the control system to predict whether the hardness and thickness of the deposits attached to the wellbore exceed the safe cleaning capacity of physical and mechanical scraping operations. If it is determined that they exceed the limit, a combined cleaning operation of chemical softening followed by mechanical scraping is initiated to avoid impact overload and jamming problems caused by the scraping tool encountering hard obstacles. If it is determined that they do not exceed the limit, mechanical physical scraping is performed directly. The entire cleaning process only involves the targeted release of chemical sulfur-dissolving agents for softening when it is determined that the deposits exceed the limits of physical and mechanical scraping operations.

[0016] 1. It can achieve precise synergy between chemical and mechanical removal processes as needed. Compared with traditional composite processes that often perform a one-size-fits-all chemical treatment on the entire well section, resulting in a large waste of reagents and potential damage to the producing formation, the intelligent judgment mechanism set up in this invention ensures that expensive and potentially corrosive chemical desulfurizers are precisely delivered and used only when necessary. For large amounts of soft or thin deposits, the chemical process is bypassed and efficient mechanical removal is carried out directly. While maximizing safe scraping, the dosage of chemical reagents used is significantly reduced, reducing waste and environmental impact. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of a sulfur deposition removal device for a high-sulfur gas wellbore according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of a sulfur deposition removal device for a high-sulfur gas wellbore according to an embodiment of the present invention.

[0019] Figure 3 For the present invention Figure 2 A magnified schematic diagram of a local structure.

[0020] Figure 4 For the present invention Figure 3 A schematic diagram of the cross-sectional structure at point AA.

[0021] Figure 5 For the present invention Figure 4 Enlarged diagram of point B in the image.

[0022] Figure 6 This is a schematic diagram of the structure of a high-sulfur gas well sulfur deposition removal device according to an embodiment of the present invention, in which the probe rod retracts into the probe section.

[0023] Figure 7 This is a schematic diagram of the structure of a probe rod in a high-sulfur gas well sulfur deposition removal device according to an embodiment of the present invention, when probing the deposits attached to the inner wall of the well. Detailed Implementation

[0024] The following is combined Figures 1-7 The specific embodiments of the present invention will be described in detail below. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Example 1 like Figures 1-7 As shown, this embodiment of the invention provides a sulfur deposition removal device for high-sulfur gas wells, including a power pipe section 1, a cleaning pipe section 2, and a detection pipe section 3.

[0027] The power pipe section 1 is used as the driving source of the cleaning device, mainly drives the cleaning pipe section 2 and the detection pipe section 3 to move downward while rotating, realizes the cleaning and detection process, the inside of the power pipe section 1 is provided with a rotating propulsion mechanism, the rotating propulsion mechanism comprises a fixed part 61 fixed to the top of the power pipe section 1, a second hydraulic cylinder 62 and a hollow shaft motor 64, the cylinder body of the second hydraulic cylinder 62 is fixed with the fixed part 61, the piston rod of the second hydraulic cylinder 62 is connected with a moving seat 63 downward, the hollow shaft motor 64 is installed on the moving seat 63, the hollow shaft 65 extends downward into the cleaning pipe section 2 and is fixed with the inner wall of the cleaning pipe section 2, through the driving of the second hydraulic cylinder 62, the downward movement process of the whole lower pipe string can be realized, through the driving of the hollow shaft motor 64, the lower pipe string can be driven to rotate, the two are matched to realize the downward movement of the rotary drilling, the setting of the hollow shaft motor 64 can form a central pipeline installation space by using the hollow shaft 65, avoids affecting the connection process of the pipeline when the hollow shaft 65 drives the lower pipe string to rotate, in specific application, the top of the fixed part 61 is installed with an ear plate 81, the ear plate 81 is connected with the steel wire rope of the ground hoisting equipment, the hollow shaft motor 64 is put into the wellbore and lowered to the area to be cleaned by using the rope transportation mode, at the same time, in order to fix the power pipe section 1 in the wellbore, so that the rotating propulsion mechanism operates, a centering support structure is arranged on the side wall of the fixed part 61, the centering support structure adopts a plurality of telescopic support arms 82, is evenly distributed and surrounded on the side wall of the fixed part 61, through synchronous control of the extension and retraction of the plurality of telescopic support arms 82, the power pipe section 1 is supported and fixed at the center of the wellbore, so as to facilitate the cleaning and detection process.

[0028] The cleaning pipe section 2 is used as the cleaning structure for removing the deposits attached to the inner wall of the wellbore, the pipe wall is provided with scraping blades 21 and a solvent spraying assembly 22 in the circumferential direction, and the solvent spraying assembly 22 is located below the scraping blades 21, the cleaning pipe section 2 can drive the scraping blades 21 and the solvent spraying assembly 22 to move synchronously under the driving of the rotating propulsion mechanism, through the scraping blades 21, the physical cleaning and scraping process of the deposits can be realized, through the sulfur solvent sprayed by the solvent spraying assembly 22, the chemical softening effect on the hard deposits can be realized, and the solvent spraying assembly 22 located below the scraping blades 21 can ensure the effect of softening first and then removing.

[0029] The detection pipe section 3 is coaxially fixed with the lower end of the cleaning pipe section 2 and is provided with a detection assembly on the upper end. The detection assembly comprises a support shaft 31, a detection rod 32, a fixed rod 33, an elastic telescopic rod 34, a detection module and a control system. The support shaft 31 is vertically connected in a slot 30 which is opened on the side wall of the detection pipe section 3. One end of the detection rod 32 is rotatably connected with the support shaft 31. One end of the fixed rod 33 is fixed with the support shaft 31. The elastic telescopic rod 34 is connected between the fixed rod 33 and the detection rod 32. The detection module is arranged on the elastic telescopic rod 34. The control system can be integrally arranged on the power pipe section 1 and is electrically connected with the detection module, the rotary propulsion mechanism and the solvent spraying assembly 22. The detection rod 32 is in contact with the surface of the deposit under the elastic support of the elastic telescopic rod 34. During the detection process, the detection rod 32 is driven by the rotary propulsion mechanism to slide on the surface of the deposit while rotating and moving downward. When the deposit has a certain thickness and hardness, the elastic telescopic rod 34 is compressed by the reverse transmission pressure of the detection rod 32. The detection module can detect whether the compression variation of the elastic telescopic rod 34 under the extrusion of the deposit reaches a preset detection threshold value, so as to determine whether the hardness and thickness of the deposit exceed the safe operation of the scraping. When the compression variation exceeds the preset detection threshold value, it indicates that the hardness and thickness of the deposit exceed the safe removal range of the scraping blade 21. Therefore, during the cleaning operation, the solvent spraying assembly 22 is controlled to spray the sulfur solvent for chemical softening operation, and then the scraping blade 21 is controlled to perform physical and mechanical removal operation, so as to avoid the problems of tool overload and blockage. When the compression variation is less than the preset detection threshold value, it indicates that the hardness and thickness of the deposit are within the safe removal range of the scraping blade 21. Therefore, during the removal operation, the rotary propulsion mechanism is controlled to drive the scraping blade 21 to perform mechanical scraping, so as to ensure that the expensive and potentially corrosive chemical sulfur solvent is accurately delivered and used only when necessary. For soft or thin layer deposits, the chemical link is bypassed and the mechanical removal is directly performed, which maximizes the safe scraping and significantly reduces the use of chemical agents, waste and environmental impact. The detection threshold value can be obtained by applying pressure to the detection assembly by using calibration materials to simulate deposits with different hardness in the simulation experiment during the experiment. The critical state when the scraping blade can stably and efficiently remove the deposit and the load begins to increase or the risk of blockage occurs is recorded. The compression amount of the elastic telescopic rod 34 at this time is measured, and the influence factors such as spring stiffness and friction coefficient are combined with the actual underground environment (temperature and pressure) to debug and correct the ground calibrated compression amount threshold value of the elastic telescopic rod 34. The theoretical basis is converted into identifiable and specific mechanical position signals.

[0030] Specifically, as an optional embodiment of the elastic telescopic rod 34, the elastic telescopic rod 34 in the embodiment includes a barrel 341, a sliding rod 342 and a spring 343, the barrel 341 is in the shape of an arc and is arranged concentrically with the support shaft 31, one end of the barrel 341 is fixedly connected with the fixed rod 33, the sliding rod 342 is in a shape matching that of the barrel 341, one end of the sliding rod 342 is slidingly connected in the barrel 341, the other end of the sliding rod 342 is fixed with the detection rod 32, the spring 343 is arranged in the barrel 341, and the two ends of the spring 343 are connected with the fixed rod 33 and the sliding rod 342 respectively, through the above arrangement, when the detection rod 32 is pressed, the sliding rod 342 can be contracted into the barrel 341 with the support shaft 31 as the rotation center and the spring 343 is compressed, compared with a straight elastic telescopic rod, the elastic telescopic rod 34 in the embodiment adopts an arc-shaped guiding design, and cooperates with the restoring force provided by the spring 343 along the tangent direction of the arc at all times, so that the detection rod 32 is stressed more reliably.

[0031] Specifically, as an optional embodiment of the detection module, the detection module in the embodiment is a magnetic switch and includes a magnetic induction element 351 and a magnet 352, the magnetic induction element 351 can be a Hall sensor, the magnetic induction element 351 is embedded on the inner wall of the barrel 341, and the magnet 352 is embedded on the inner wall of the sliding rod 342, when the magnet 352 moves to a position opposite to the magnetic induction element 351 in the compression process following the sliding rod 342, the magnetic induction element 351 senses and transmits a signal to the control system for control.

[0032] In the embodiment, the magnetic induction element 351 is arranged at a position of the sliding rod 342 relative to a calibration position of the critical thickness and hardness deposit, the position is set based on historical core experiment data and cleanout operation experience, a critical value of hardness or compression strength of a deposit distinguishing between being directly mechanically scraped and being chemically softened first is determined, a threshold region of the position of the detection rod 32 contacting the hard deposit and the deposit of a certain thickness and compressing the spring 343 is set, when the magnet 352 moves to the position opposite to the magnetic induction element 351 in the compression process following the sliding rod 342, it is indicated that the hardness and thickness of the deposit detected exceed the operation strength of cleaning by the scraping blade 21 alone, so that a signal is sent to the control system, and a complex operation of chemical pre-softening and physical removal is performed.

[0033] In another embodiment of the application, the detection assembly further includes a rotating part, the rotating part includes a first hydraulic cylinder 41 and a nut seat 42, the first hydraulic cylinder 41 is connected in the inside of the detection pipe segment 3, the nut seat 42 is fixed with the piston rod end of the first hydraulic cylinder 41 through a first connecting rod 43, the support shaft 31 is a lead screw, and the two ends of the lead screw are correspondingly rotatably connected with the upper and lower two side wall surfaces of the slot 30 through bearings, and the nut seat 42 is sleeved and connected on the lead screw.

[0034] In the embodiment, the rotating part can drive the support shaft 31 to rotate, thereby driving the elastic telescopic rod 34 and the detection rod 32 to rotate and adjust the positions thereof, so as to realize the function of extending or retracting the detection rod 32 from the slot 30, so that the detection rod 32 can be retracted to avoid being affected when the hard deposits are softened by spraying the solvent agent by the solvent spraying assembly 22. When the rotating part drives the support shaft 31 to rotate, the piston rod of the first hydraulic cylinder 41 is controlled to extend and retract, and the nut seat 42 is driven to move downward by the first connecting rod 43. Since the support shaft 31 is a screw rod, the screw rod is pressed when the nut seat 42 moves downward along the screw rod. Since the two ends of the screw rod are rotatably connected to the slot 30 by bearings, the linear motion can be converted into rotary motion to drive the screw rod to rotate.

[0035] The slot 30 is arc-shaped, and the shape of the detection rod 32 matches the slot 30. In this way, the detection rod 32 can be completely retracted into the slot 30 when being driven to rotate by the rotating part, and the elastic telescopic rod 34 is retracted into the detection tube segment 3. The end face of the end of the detection rod 32 away from the support shaft 31 is a spherical surface, and the inner arc surface of the detection rod 32 is fixed to the end of the slide rod 342. Through the above arrangement, the detection rod 32 can smoothly contact the deposits.

[0036] In order to block the softened cleaning area and reduce the loss of the solvent agent during the chemical softening and cleaning of the hard deposits by spraying the solvent agent by the solvent spraying assembly 22, the sealing assembly is arranged on the cleaning tube segment 2. The sealing assembly comprises two sealing sleeves 51, a sealing rubber sleeve 52, two partition plates 53, a gas injection pipe 54 and a piston 55. The two sealing sleeves 51 are symmetrically fixed on the outer pipe wall of the cleaning tube segment 2. The sealing rubber sleeve 52 is sealingly fixed between the two sealing sleeves 51. The two partition plates 53 are fixedly sleeved inside the cleaning tube segment 2 and located on the upper and lower sides of the sealing rubber sleeve 52, so as to form an air chamber in the cleaning tube segment 2. The circumferential side wall of the cleaning tube segment 2 is provided with a connecting hole for injecting gas into the sealing rubber sleeve 52. The partition plate 53 on the lower side is provided with a pressure relief port 531, and the first hydraulic cylinder 41 is fixed on the bottom of the partition plate 53 on the lower side. One end of the gas injection pipe 54 is connected to an external gas conveying assembly, and the other end of the gas injection pipe 54 extends into the air chamber. The piston 55 is slidingly connected in the pressure relief port 531, and the bottom of the piston 55 is fixed to the piston rod of the first hydraulic cylinder 41 by the second connecting rod 56.

[0037] In this embodiment, during chemical cleaning, the piston rod of the first hydraulic cylinder 41 is first extended. During the extension of the piston rod, the piston 55 moves downward through the second connecting rod 56, thereby sealing the pressure relief port 531 to form an inflation chamber. At the same time, the nut seat 42 moves downward through the first connecting rod 43 to compress the support shaft 31, causing the support shaft 31 to rotate and retract the elastic telescopic rod 34 and the probe rod 32 into the probe tube section 3. Then, gas is delivered to the gas injection pipe 54 through the external gas delivery assembly and injected into the inflation chamber. Since the pressure relief port 531 is blocked, as the gas is continuously injected, it will enter the sealing rubber tube 52 through the connecting hole and cause the sealing rubber tube 52 to expand radially. This expands the sealing rubber tube 52 and forms a set seal with the inner wall of the wellbore, forming a temporary closed reaction chamber. The area between the solvent spraying assembly 22 and the probe rod 32 is separated. At this time, the external gas supply assembly stops injecting gas and remains in a charged state. This allows the sealing tube 52 to receive the sulfur-dissolving agent sprayed from above during the chemical softening and cleaning of hard deposits by the sulfur-dissolving agent sprayed by the solvent spraying assembly 22, so that the sulfur-dissolving agent can fully combine with the deposits. After the reaction is completed, the piston rod of the first hydraulic cylinder 41 is controlled to retract. In the opposite direction of the above movement, the piston 55 moves upward to open the pressure relief port 531. At this time, the gas in the sealing tube 52 will be discharged through the pressure relief port 531 and through the slot 30, thereby releasing the setting state. The support shaft 31 rotates in the opposite direction to extend the elastic telescopic rod 34 and the probe rod 32 from the slot 30 for detection.

[0038] Specifically, the solvent spraying assembly 22 includes multiple nozzles 221 and a delivery pipe 222. The multiple nozzles 221 are evenly distributed and fixed around the circumferential sidewall of the cleaning pipe section 2 and are located above the sealing tube 52. The delivery pipe 222 passes through the air injection pipe 54. One end of the delivery pipe 222 is connected to the external liquid delivery assembly, and the other end of the delivery pipe 222 extends to the bottom of the air injection pipe 54 and is connected to the multiple nozzles 221 respectively through the multi-port pipe 223.

[0039] Example 2 Based on Example 1, this embodiment discloses a method for removing sulfur deposits from the wellbore of a high-sulfur gas well, which is implemented using the aforementioned removal device and includes the following steps: S1. Place the cleaning device into the well shaft to be cleaned.

[0040] The specific process is as follows: using ground lifting equipment, steel wire ropes are lowered through the fixed part 61 to... The power pipe section 1, the cleaning pipe section 2, and the detection pipe section 3 are placed inside the wellbore. The height of the cleaning device is adjusted by adjusting the release length of the wire rope. When it moves to the area to be cleaned, the power pipe section 1 is fixed to the center of the inner wall of the wellbore by multiple sets of telescopic arms 82.

[0041] S2, control the rotary propulsion mechanism to drive the cleaning pipe section 2 and the detection pipe section 3 to rotate down by a distance equal to the vertical distance between the scraping blade 21 and the detection rod 32.

[0042] The specific process is that the first hydraulic cylinder 41 is controlled to act, the detection rod 32 is rotated and unfolded to the detection state, the control system instructs the rotary propulsion mechanism to start, and the driving device moves down by a preset step length L in the rotary drilling mode, the step length L is equal to the vertical distance between the scraping blade 21 and the detection rod 32.

[0043] S3, the detection pipe section 3 rotates down and moves, and the thickness and hardness of the deposit are detected by the detection rod 32 in contact with the deposit, when the detection rod 32 rotates with the detection pipe section 3, the compression change amount of the elastic expansion rod 34 extruded by the deposit is detected by the detection module, when the compression change amount extruded by the deposit is less than the set compression change amount, the control system judges that the current deposit can be directly mechanically removed, and when the compression change amount extruded by the deposit is greater than the set compression change amount, the control system judges that the current deposit needs to be softened before being mechanically removed.

[0044] S4, after the current detection ends, the rotary propulsion mechanism is controlled to drive the cleaning pipe section 2 and the detection pipe section 3 to continue to move down by the same distance, the cleaning pipe section 2 executes the corresponding removal process according to the last detection result of the detection rod 32 in the moving process, and the detection pipe section 3 executes the detection process of the deposit attached to the next area of the wellbore in the moving process.

[0045] S5, the above process is repeated until the cleaning of the entire attached area of the wellbore to be cleaned is completed.

[0046] The above disclosure is only the preferred several specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.

Claims

1. A high-sulfur gas well bore sulfur deposit cleaning device, comprising a power pipe section and a cleaning pipe section, a rotating propulsion mechanism is arranged on the power pipe section, an upper end of the cleaning pipe section is connected with an output end of the rotating propulsion mechanism, a scraping blade and a solvent spraying assembly are arranged on a circumferential outer wall of the cleaning pipe section, and the solvent spraying assembly is located below the scraping blade, characterized in that, The probe pipe section coaxially fixed with the lower end of the cleaning pipe section is further provided with a probe assembly, and the probe assembly comprises: A support shaft is connected in a notch horizontally provided on the side wall of the probe pipe section; A probe rod is rotatably connected to one end of the support shaft; A fixed rod is fixed to one end of the support shaft; An elastic telescopic rod is connected between the fixed rod and the probe rod; A detection module is arranged on the elastic telescopic rod; A control system is electrically connected with the detection module, the rotary propulsion mechanism and the solvent spraying assembly, respectively. When the probe rod contacts the deposit and moves, the control system detects whether the compression change amount of the elastic telescopic rod pressed by the deposit reaches a set threshold value to determine whether the hardness and thickness of the deposit exceed the scraping safety operation requirement. When the threshold value is less than the set threshold value, the rotary propulsion mechanism drives the scraping blade to perform a separate physical cleaning operation during the cleaning process. When the threshold value is greater than the set threshold value, the solvent spraying assembly sprays a sulfur solvent for chemical softening operation, and then the scraping blade performs a physical cleaning operation.

2. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 1, wherein, The elastic telescopic rod comprises a cylinder, a sliding rod and a spring. The cylinder is in the shape of an arc and is concentrically arranged with the support shaft. One end of the cylinder is fixedly connected with the fixed rod. The sliding rod is in the shape matching that of the cylinder. One end of the sliding rod is slidably connected in the cylinder, and the other end of the sliding rod is fixed with the probe rod. The spring is arranged in the cylinder, and the two ends of the spring are respectively connected with the fixed rod and the sliding rod.

3. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 2, wherein, The detection module is a magnetic switch comprising a magnetic induction element and a magnet. The magnetic induction element is embedded on the inner wall of the cylinder, and the magnet is embedded on the inner wall of the sliding rod. When the magnet moves to a position opposite to the magnetic induction element during the compression process, the magnetic induction element senses and transmits a signal to the control system for control.

4. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 2, wherein, The probe assembly further comprises a rotating part comprising a first hydraulic cylinder and a nut seat. The first hydraulic cylinder is connected inside the probe pipe section, and the nut seat is fixed with the piston rod end of the first hydraulic cylinder through a first connecting rod. The support shaft is a screw rod, and the two ends of the screw rod are rotatably connected with the upper and lower side walls of the notch. The nut seat is sleeved and connected on the screw rod.

5. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 4, wherein The notch is in the shape of an arc, and the shape of the probe rod matches that of the notch. The end face of the end of the probe rod away from the support shaft is a spherical surface, and the inner arc surface of the probe rod is fixed with the end of the sliding rod.

6. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 4, wherein, The cleaning pipe section is provided with a sealing assembly comprising: Two sealing sleeves are symmetrically fixed on the outer pipe wall of the cleaning pipe section; A sealing rubber tube is sealingly fixed between the two sealing sleeves; Two partition plates are fixedly sleeved inside the cleaning pipe section and located on the upper and lower sides of the sealing rubber tube, forming an air-filled cavity. A connecting hole for injecting air into the sealing rubber tube is provided on the circumferential side wall of the cleaning pipe section. The partition plate on the lower side is provided with a pressure relief port. The first hydraulic cylinder is fixed on the bottom of the partition plate on the lower side. An air injection pipe is connected with an external air supply assembly at one end and extends into the air-filled cavity at the other end. A piston is slidingly connected in the pressure relief port, and the bottom of the piston is fixed with the piston rod of the first hydraulic cylinder through a second connecting rod.

7. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 6, wherein, The rotating propulsion mechanism comprises: A fixed part is fixed on the upper end of the power pipe section; A second hydraulic cylinder is fixed on the fixed part, and a moving seat is connected to the output end of the second hydraulic cylinder; A hollow shaft motor is fixed on the moving seat, and the hollow shaft of the hollow shaft motor extends into the cleaning pipe section and is fixed with the inner wall of the cleaning pipe section, and the gas injection pipe is arranged in the hollow shaft.

8. The high-sour gas well bore sulfur deposition cleanup apparatus of claim 7, wherein, The solvent injection assembly comprises a plurality of spray heads and a delivery pipe, the plurality of spray heads are uniformly arranged on the circumferential side wall of the cleaning pipe section and above the sealing rubber sleeve, and the delivery pipe is arranged in the gas injection pipe, one end of the delivery pipe is connected with an external infusion assembly, and the other end of the delivery pipe extends below the gas injection pipe and is connected with the plurality of spray heads through a multi-way pipe.

9. A method for removing sulfur deposits from a wellbore of a high-sulfur gas well using the removal device according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Placing the cleaning device into the wellbore to be cleaned; Controlling the rotating propulsion mechanism to drive the cleaning pipe section and the detection pipe section to rotate downward by a distance equal to the vertical distance between the scraping blade and the detection rod; During the downward rotation of the detection pipe section, the detection rod is used to contact the deposit to detect the thickness and hardness of the deposit, and when the detection rod rotates with the detection pipe section, the detection module detects the compression change amount of the elastic expansion rod under the extrusion of the deposit, and when the compression change amount is less than a set compression change amount, the control system determines that the current deposit can be directly mechanically cleaned, and when the compression change amount is greater than the set compression change amount, the control system determines that the current deposit needs to be softened before being mechanically cleaned; After the current detection is completed, the rotating propulsion mechanism is controlled to drive the cleaning pipe section and the detection pipe section to continue to move downward by the same distance, and the cleaning pipe section performs a corresponding cleaning process according to the last detection result of the detection rod during the movement, and the detection pipe section performs a detection process on the deposit attached to the next area of the wellbore during the movement; The above process is repeated until the cleaning of the entire attached area of the wellbore to be cleaned is completed.

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