Underground sleeve slotting device and using method thereof

Abstract

The invention relates to the technical field of petroleum downhole operation equipment, in particular to a downhole casing pipe slotting device and a using method thereof.The device comprises a supporting pipe used for pushing the device to move in a casing pipe, one end of the supporting pipe is connected with a propelling head, and the downhole casing pipe slotting device is characterized in that the propelling head and the supporting pipe are sequentially provided with a cutting head, a recycling groove and an injection head; the cutting head and the recovery tank are located on the same horizontal line. The spraying heads are located on the two sides of the cutting head. A screening mechanism used for filtering metal particles in water flow and a grinding mechanism used for smashing the metal particles are arranged in the recovery tank. The discharging end of the grinding mechanism communicates with the liquid inlet end of the spraying head. The device further comprises a control panel, the screening mechanism is further used for weighing real-time weight data of the metal particles and sending the real-time weight data to the control panel, and the control panel is used for adjusting the grinding precision of the grinding mechanism based on the real-time weight data and is used for improving the resource utilization rate, achieving stable cutting and guaranteeing the machining efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of downhole petroleum operation equipment, and in particular to a downhole casing cutting device and a use method thereof. Background Art

[0002] For low permeability reservoirs, by using specific technologies or tools to cut narrow and long seams in the well wall or well structure, the permeability of the well can be improved, the flow efficiency of fluids (such as oil, natural gas or water) can be increased, and the well can be transformed or repaired to extend the service life of the well.

[0003] The existing underground slit cutting technology usually uses mechanical cutting and hydraulic cutting methods. In the mechanical cutting method, the saw blade is easy to break due to the contact between the saw blade and the metal pipe, resulting in poor slit cutting effect and easy sparks. In hydraulic cutting, since high-pressure water flow is used for cutting, the spark and heat limitations in the mechanical cutting process can be overcome, reducing the safety risks underground.

[0004] However, hydraulic cutting is limited by water flow pressure, so the cutting speed is slow. Therefore, abrasive jet can be used to enhance the water flow cutting ability, but it requires a lot of water resources and electricity support, and the cost is high. Therefore, based on the determination of mechanical cutting and hydraulic cutting, the present invention provides a downhole casing slitting device with fast processing speed and stable cutting to ensure processing efficiency. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a downhole casing cutting device and a method of using the same, which are used to improve resource utilization, achieve stable cutting, and ensure processing efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a downhole casing cutting device, comprising a support pipe for pushing the device to move in the casing, one end of the support pipe is connected to a propulsion head, and a cutting head, a recovery groove and an injection head are sequentially arranged on the propulsion head and the support pipe, the cutting head and the recovery groove are on the same horizontal line, and the injection heads are located on both sides of the cutting head;

[0007] The recovery tank is provided with a screening mechanism for filtering metal particles in the water flow and a grinding mechanism for crushing the metal particles; the discharge end of the grinding mechanism is connected to the liquid inlet end of the injection head;

[0008] It also includes a control panel. The screening mechanism is also used to weigh the real-time weight data of the metal particles and send the real-time weight data to the control panel. The control panel is used to adjust the grinding accuracy of the grinding mechanism based on the real-time weight data.

[0009] The technical principle of the above scheme is as follows: the propulsion head is pushed to move in the casing through the support tube, and the metal particles generated during the cutting head processing are recycled through the screening mechanism and the grinding mechanism to improve the wear effect of the subsequent hydraulic cutting of the jet head. At the same time, the cutting head is cooled by spraying water through the jet head to improve the cutting effect.

[0010] The above scheme has the following beneficial effects:

[0011] 1. This solution controls the rotation speed of the cutting head to reduce the wear of the cutting head during contact with the hard metal pipe, thereby extending the service life of the cutting head.

[0012] 2. This solution recycles the metal particles produced during the cutting head processing process to improve resource utilization, while reducing the damage to the cutting head caused by residual metal particles, thereby ensuring the cutting effect.

[0013] 3. This solution improves processing efficiency by matching the cutting head and the jet head, while making up for the defects of mechanical cutting and hydraulic cutting.

[0014] Furthermore, return grooves are provided on both sides of the cutting head, and the return grooves are opened on the propulsion head.

[0015] Beneficial effect: The return groove is used to form a reflux, and the two sides of the cutting head are flushed by the reflux to reduce the wear of the cutting head during subsequent processing.

[0016] Furthermore, a water pump is fixedly connected in the support tube, the feed end of the water pump is connected with a water pipe, and the feed end of the water pump is also connected with the discharge end of the grinding mechanism; the discharge end of the water pump is connected with the injection head;

[0017] A mounting plate is slidably fitted inside the push head, and a plurality of electric push rods for adjusting the drilling depth of the cutting head are fixedly connected to the bottom of the mounting plate, and the electric push rods are electrically connected to the control panel;

[0018] A first motor is fixedly connected to the top of the mounting plate, and an output end of the first motor is coaxially fixedly connected to the cutting head;

[0019] A rotating belt is rotatably matched on the support tube, a plurality of brackets with adjustable lengths are fixedly connected to the rotating belt, and a roller is hingedly connected to one end of the bracket away from the rotating belt; a second motor is fixedly connected inside the support tube, and an output shaft of the second motor is fixedly connected to the rotating belt;

[0020] The output shafts of the first motor and the second motor are respectively connected with a first speed sensor and a second speed sensor, the first speed sensor is used to measure first speed information corresponding to the first motor, and the second speed sensor is used to measure second speed information corresponding to the second motor, and the first speed information and the second speed information are sent to the control panel;

[0021] The control panel is used to input and store the hardness information of the current casing and the casing diameter of the current casing, and generate a processing depth instruction based on the casing diameter and send it to the electric push rod; then generate a first standard speed corresponding to the first motor and a second standard speed corresponding to the second motor based on the hardness information, and send the first standard speed and the second standard speed to the first motor and the second motor respectively; at the same time, generate a standard pressure corresponding to the water pump based on the hardness information, and send the standard pressure to the water pump.

[0022] Beneficial effects: The basic processing speed of the first motor and the standard pressure of the water pump are determined through the hardness information of the current casing to ensure stable cutting of the cutting head and the injection head; at the same time, the forward speed of the propulsion head is controlled to reduce the feed amount of the cutting head during the cutting process, further reducing the wear of the cutting head.

[0023] Furthermore, the screening mechanism includes a recovery tank connected to the return tank, the recovery tank is arranged on the support pipe, and the injection head is located in the recovery tank;

[0024] The side of the return groove away from the recovery groove is higher than the side of the return groove close to the recovery groove. A filter screen connected to the grinding mechanism is provided in the recovery groove. A pressure sensor is used at the bottom of the filter screen to measure the real-time weight data of the residual metal particles on the filter screen, and the real-time weight data is sent to the control panel.

[0025] Beneficial effect: Since the injection head is located in the recovery tank, most of the water flow will be recovered from the recovery tank. Through the setting of the filter net, the metal particles or other solid substances in the water flow can be filtered to reduce the probability of blockage of the internal pipeline and realize the reuse of the water flow.

[0026] Further, the grinding mechanism includes an inspection groove located below the return groove, one side of the inspection groove is connected to the recovery groove, and an inclined docking groove is connected between the inspection groove and the recovery groove;

[0027] A crushing roller is provided in the recovery tank, and the crushing roller is located below the filter screen. A third motor is coaxially connected to one side of the crushing roller, and the third motor is gap-matched with the support tube. An elastic layer is fixedly connected between the third motor and the support tube. A clamping block is rotatably matched with the side of the crushing roller away from the third motor, and the clamping block is located below the docking groove. A transfer cavity is opened in the support tube, and the clamping block is located in the transfer cavity.

[0028] The transfer chamber is connected to the recovery tank and the docking tank respectively. A transfer pipe is also connected between the transfer chamber and the water pump. The discharge end of the water pump is connected to the transfer pipe.

[0029] The control panel is also used to obtain the comparison value corresponding to the pressure sensor based on the hardness information of the current casing, and compare the comparison value with the real-time weight data. If the real-time weight data is greater than the comparison value, a pressure increase instruction is sent to the water pump; if the real-time weight data is less than the comparison value, a maintenance instruction is sent to the water pump.

[0030] Beneficial effect: During the cutting process of the cutting head, the water flow is used to flush the crushing roller through the transfer end of the water pump to reduce the metal residue on the crushing roller, thereby reducing the occurrence of blockage in the docking groove. At the same time, by shortening the grinding accuracy of adjacent crushing rollers, the probability of internal pipeline blockage is reduced and the consistency of the grinding particles is maintained.

[0031] Furthermore, a side of the docking groove close to the inspection groove is higher than a side of the docking groove far from the inspection groove.

[0032] Beneficial effect: The inclined docking trough facilitates the water flow and metal particles inside the inspection trough to fall into the recovery trough for crushing.

[0033] Furthermore, the bracket includes a first rod and a second rod that slide together, the diameter of the first rod is smaller than the diameter of the second rod, both the first rod and the second rod are provided with threaded holes, screws are connected in the threaded holes, and the first rod and the second rod are fixedly connected by the screws.

[0034] Beneficial effect: The adjustable bracket facilitates the clamping and fixing between the support tube and the sleeve, thereby improving the stability of the support tube when moving in the sleeve.

[0035] Furthermore, the inspection tank is also provided with a turbidity sensor for detecting the turbidity of the water flow in real time, and sending the turbidity of the water flow to the control panel;

[0036] The control panel is used to compare the turbidity of the water flow with a set first standard value. If the turbidity of the water flow is greater than the first standard value, a mitigation instruction is sent to the second motor; if the turbidity of the water flow is less than the first standard value, a maintenance instruction is sent to the second motor.

[0037] Beneficial effect: As the propulsion head moves forward, a relatively sealed space is formed between the propulsion head and the casing. The speed of the propulsion head is adjusted by controlling the speed of the second motor to facilitate the recovery of metal particles in the water flow, thereby reducing the probability of blockage in the internal pipeline.

[0038] Furthermore, the control panel is also used to calculate the difference between the water turbidity in the current time period and the water turbidity before the current time period when there is no parameter change in the first motor, the second motor and the water pump, and compare the difference with the set second standard value. If the difference is greater than the second standard value, a warning instruction is sent to the outside world; if the difference is less than the second standard value, a verification pass instruction is sent to the outside world.

[0039] Beneficial effect: The wear of the blade can be determined by the change of turbidity per unit time, so as to remind the staff to replace the blade in time.

[0040] Further, a method for using a downhole casing slitting device, according to the method for using the downhole casing slitting device, comprises the following steps: step 1, based on the material and properties of the casing, replacing the corresponding cutting head and adjusting the length of the bracket to form a stable support;

[0041] Step 2: Save the processing parameter information during casing processing to the control panel, where the processing parameter information includes parameter information corresponding to the first motor, the second motor and the water pump;

[0042] Step 3: The roller on the rotating belt is driven forward by the second motor, and then the cutting head is used to pre-grind the seam to form a seam to be processed, and the abrasive is recycled through the screening mechanism and the grinding mechanism; at the same time, the abrasive jet is sprayed through the injection head to enlarge the seam to be processed;

[0043] Step 4: The control panel adjusts the pressure of the water pump based on the real-time weight data, and the control panel controls the second motor or sends a warning command to the outside world based on the turbidity of the water flow from the turbidity sensor.

[0044] Beneficial effects: With the pre-processing of the cutting head, the water flow is easily dispersed inside the smooth casing. Cutting by the cutting head can not only form recycled abrasives, but also facilitate subsequent hydraulic cutting. The control panel automatically controls each component to work, so as to facilitate the processing, achieve stable cutting, and ensure processing efficiency.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is an axonometric diagram of an embodiment of a downhole casing slotting device and a method for using the same according to the present invention;

[0047] Figure 2 It is a side view of an embodiment of a downhole casing slotting device and a method for using the same according to the present invention;

[0048] Figure 3 A top view of an embodiment of a downhole casing slotting device and a method for using the same according to the present invention;

[0049] Figure 4 for Figure 3 Schematic diagram of the cross section in the AA direction;

[0050] Figure 5 for Figure 4A magnified schematic diagram of part A in the figure.

[0051] The figure marks in the drawings of the specification include: 1. support tube; 11. recovery tank; 12. bracket; 13. roller; 2. propulsion head; 21. return groove; 22. matching block; 23. inspection groove; 24. turbidity sensor; 25. docking groove; 3. first motor; 31. cutting head; 32. mounting plate; 33. electric push rod; 4. filter screen; 5. injection head; 51. water pipe; 52. water pump; 53. solenoid valve; 54. transfer pipe; 6. rotating belt; 61. second motor; 7. crushing roller; 71. locking block. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The following is further described in detail through specific implementation methods:

[0056] Embodiment 1:

[0057] As attached Figures 1 to 5As shown: a downhole casing cutting device, including a support tube 1 for pushing the device to move in the casing, one end of the support tube 1 is threadedly connected with a propulsion head 2, a control panel (not shown in the figure) is provided in the support tube 1, and a cutting head 31, a recovery groove 11 and an injection head 5 are provided on the propulsion head 2 and the support tube 1 in sequence, the cutting head 31 and the recovery groove 11 are on the same horizontal line, and the injection head 5 is located on both sides of the cutting head 31; return grooves 21 are provided on both sides of the cutting head 31, and the return grooves 21 are opened on the propulsion head 2.

[0058] A water pump 52 is bolted and fixedly connected in the support pipe 1, and a water pipe 51 is connected to the feed end of the water pump 52. A solenoid valve 53 for controlling the opening and closing of the water pipe 51 is provided in the water pipe 51. A mounting plate 32 is slidably fitted in the propulsion head 2, and a plurality of electric push rods 33 for adjusting the drilling depth of the cutting head 31 are fixedly connected to the bottom of the mounting plate 32, and the electric push rods 33 are electrically connected to the control panel.

[0059] A first motor 3 is fixedly connected to the top of the mounting plate 32, and an output end of the first motor 3 is coaxially fixedly connected to the cutting head 31; and a matching block 22 is rotatably matched with the output end of the first motor 3, and the matching block 22 is located in the return groove 21. A rotating belt 6 is rotatably matched on the support tube 1, and a plurality of adjustable-length brackets 12 are fixedly connected to the rotating belt 6. The bracket 12 includes a first rod and a second rod that are slidably matched with each other, and the diameter of the first rod is smaller than the diameter of the second rod. Threaded holes are provided on the first rod and the second rod, and screws are connected in the threaded holes. The first rod and the second rod are fixedly connected by screws, and a roller 13 is hinged at one end of the first rod away from the rotating belt 6.

[0060] A second motor 61 is fixedly connected inside the support tube 1, and the output shaft of the second motor 61 is fixedly connected to the rotating belt 6; the output shafts of the first motor 3 and the second motor 61 are respectively connected to a first speed sensor and a second speed sensor, the first speed sensor is used to measure the first speed information corresponding to the first motor 3, and the second speed sensor is used to measure the second speed information corresponding to the second motor 61, and the first speed information and the second speed information are sent to the control panel.

[0061] The control panel is used to input and store the hardness information of the current casing and the casing diameter of the current casing, and generate a processing depth instruction based on the casing diameter and send it to the electric push rod 33; then generate a first standard speed corresponding to the first motor 3 and a second standard speed corresponding to the second motor 61 based on the hardness information, and send the first standard speed and the second standard speed to the first motor 3 and the second motor 61 respectively; at the same time, generate a standard pressure corresponding to the water pump 52 based on the hardness information, and send the standard pressure to the water pump 52.

[0062] The recovery tank 11 is provided with a screening mechanism for filtering metal particles in the water flow and a grinding mechanism for crushing metal particles; the discharge end of the grinding mechanism is connected to the liquid inlet end of the injection head 5; the feed end of the water pump 52 is also connected to the discharge end of the grinding mechanism; the discharge end of the water pump 52 is connected to the injection head 5.

[0063] Among them, the screening mechanism includes a recovery groove 11 connected to the return groove 21, the recovery groove 11 is opened on the support tube 1, and the injection head 5 is located in the recovery groove 11; the side of the return groove 21 away from the recovery groove 11 is higher than the side of the return groove 21 close to the recovery groove 11, and a filter screen 4 connected to the grinding mechanism is provided in the recovery groove 11, and a pressure sensor (not shown in the figure) at the bottom of the filter screen 4 is used to measure the real-time weight data of the residual metal particles on the filter screen 4, and the real-time weight data is sent to the control panel.

[0064] For example, after the injection head 5 makes contact with the casing wall for the first time, the water flow will flow toward the cutting head 31, slowing down the impact force of the water flow, and then forming a backflow through the return groove 21, flushing both sides of the cutting head 31 through the backflow, so as to reduce the wear of the cutting head 31 during subsequent processing.

[0065] Since the injection head 5 is located in the recovery tank 11, based on the flow characteristics of the water flow ejected by the injection head 5, most of the water flow will be recovered from the recovery tank 11. Therefore, the filter screen 4 is set to filter the metal particles or other solid substances in the water flow to reduce the probability of blockage of the internal pipeline; the inclined return groove 21 is used to guide the water flow to be re-discharged into the filter screen 4 in the recovery tank 11 for filtration, so as to reduce the content of metal particles or other solid impurities in the recovered water flow, thereby realizing the reuse of the water flow.

[0066] The grinding mechanism includes an inspection groove 23 located below the return groove 21, one side of the inspection groove 23 is connected to the recovery groove 11, an inclined docking groove 25 is connected between the inspection groove 23 and the recovery groove 11, and the side of the docking groove 25 close to the inspection groove 23 is higher than the side of the docking groove 25 away from the inspection groove 23; a crushing roller 7 is provided in the recovery groove 11, and the crushing roller 7 is located below the filter screen 4, and a third motor is coaxially connected to one side of the crushing roller 7, and the third motor is gap-matched with the support tube 1, and an elastic layer is fixedly connected between the third motor and the support tube 1; the side of the crushing roller 7 away from the third motor is rotatably matched with a snap-fit ​​block 71, the snap-fit ​​block 71 is located below the docking groove 25, and a transfer chamber is opened in the support tube 1, and the snap-fit ​​block 71 is located in the transfer chamber; the transfer chamber is respectively connected to the recovery groove 11 and the docking groove 25, and a transfer pipe 54 is also connected between the transfer chamber and the water pump 52, and the discharge end of the water pump 52 is connected to the transfer pipe 54.

[0067] The control panel is also used to obtain a comparison value corresponding to the pressure sensor based on the hardness information of the current casing (when the first standard rotation speed and the second standard rotation speed are consistent), and compare the comparison value with the real-time weight data. If the real-time weight data is greater than the comparison value, a pressure increase instruction is sent to the water pump 52; if the real-time weight data is less than the comparison value, a pressure increase instruction is sent to the water pump 52.

[0068] For example, during the cutting process of the cutting head 31, the water flow is used to flush the crushing roller 7 through the transfer end of the water pump 52 to reduce the metal residue on the crushing roller 7, thereby reducing the occurrence of blockage in the docking groove 25. At the same time, when the metal particles dropped from the casing become larger, the hardness of the casing may change, resulting in a larger feed amount and coarser chips, making the weight measured by the pressure sensor heavier. By adjusting the pressure of the water pump 52 to push the crushing roller 7 to move upward, the grinding accuracy of the adjacent crushing rollers 7 is shortened to reduce the probability of blockage in the internal pipeline and maintain the consistency of the grinding particles.

[0069] Embodiment 2:

[0070] The difference from Example 1 is that the inspection tank 23 is also provided with a turbidity sensor 24 for real-time detection of water turbidity, and the water turbidity is sent to the control panel; the control panel is used to compare the water turbidity with the set first standard value. If the water turbidity is greater than the first standard value, a slowdown instruction is sent to the second motor 61; if the water turbidity is less than the first standard value, a maintenance instruction is sent to the second motor 61.

[0071] For example, as the propulsion head 2 moves forward, a relatively sealed space is formed between the propulsion head 2 and the casing. Only after the casing is completely cut or the metal particles in the water are recovered, the metal particle content in the inspection tank 23 is reduced. The speed of the propulsion head 2 is adjusted by controlling the rotation speed of the second motor 61 to facilitate the recovery of the metal particles in the water flow, thereby reducing the probability of blockage in the internal pipeline.

[0072] The control panel is also used to calculate the difference between the water turbidity in the current time period and the water turbidity before the current time period when there is no parameter change in the first motor 3, the second motor 61 and the water pump 52, and compare the difference with the set second standard value. If the difference is greater than the second standard value, a warning instruction is sent to the outside world; if the difference is less than the second standard value, a verification pass instruction is sent to the outside world.

[0073] For example, during the processing, the turbidity change per unit time can be used to determine the wear of the blade and remind the staff to replace the blade in time.

[0074] Embodiment 3:

[0075] The difference from Example 2 is that a method for using a downhole casing cutting device, according to the method for using the downhole casing cutting device, includes the following steps: Step 1, based on the material and properties of the casing, replace the corresponding cutting head 31 and adjust the length of the bracket 12 to form a stable support to provide stability during the cutting process.

[0076] Step 2: Save the processing parameter information during casing processing to the control panel, including the parameter information corresponding to the first motor 3, the second motor 61 and the water pump 52. The basic processing speed of the first motor 3 and the standard pressure of the water pump 52 are determined by the hardness information of the current casing to ensure the stable cutting of the cutting head 31 and the injection head 5; at the same time, the forward speed of the propulsion head 2 is controlled to reduce the feed amount of the cutting head 31 during the cutting process, and further reduce the wear of the cutting head 31.

[0077] Step three, the roller 13 on the rotating belt 6 is driven forward by the second motor 61, and then the cutting head 31 is used to pre-grind the seam to form a seam to be processed, and the abrasive is recycled through the processing of the screening mechanism and the grinding mechanism; at the same time, the abrasive jet is sprayed through the injection head 5 to expand the seam to be processed; by using the pre-processing of the cutting head 31, the water flow is easy to disperse inside the smooth casing, and the cutting by the cutting head 31 can not only form recycled abrasive, but also facilitate subsequent hydraulic cutting.

[0078] Step 4: The control panel adjusts the pressure of the water pump 52 based on the real-time weight data, and controls the second motor 61 or issues a warning command to the outside world based on the water turbidity of the turbidity sensor 24. The coordinated cutting head 31 and the spray head 5 can improve the processing efficiency and make up for the defects of mechanical cutting and hydraulic cutting.

[0079] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A downhole casing cutting device, comprising a support tube (1) for pushing the device to move in the casing, one end of the support tube (1) being connected to a pushing head (2), characterized in that: A cutting head (31), a recovery tank (11) and an injection head (5) are sequentially arranged on the propulsion head (2) and the support tube (1); the cutting head (31) and the recovery tank (11) are located on the same horizontal line, and the injection head (5) is located on both sides of the cutting head (31); The recovery tank (11) is provided with a screening mechanism for filtering metal particles in the water flow and a grinding mechanism for crushing the metal particles; the discharge end of the grinding mechanism is connected to the liquid inlet end of the injection head (5); It also includes a control panel. The screening mechanism is also used to weigh the real-time weight data of the metal particles and send the real-time weight data to the control panel. The control panel is used to adjust the grinding accuracy of the grinding mechanism based on the real-time weight data.

2. The downhole casing cutting device according to claim 1, characterized in that: The cutting head (31) is provided with return grooves (21) on both sides, and the return grooves (21) are formed on the pushing head (2).

3. The downhole casing cutting device according to claim 2, characterized in that: A water pump (52) is fixedly connected inside the support tube (1); the feed end of the water pump (52) is connected to the water pipe (51); the feed end of the water pump (52) is also connected to the discharge end of the grinding mechanism; the discharge end of the water pump (52) is connected to the injection head (5); A mounting plate (32) is slidably fitted inside the propulsion head (2), a plurality of electric push rods (33) for adjusting the drilling depth of the cutting head (31) are fixedly connected to the bottom of the mounting plate (32), and the electric push rods (33) are electrically connected to the control panel; A first motor (3) is fixedly connected to the top of the mounting plate (32), and an output end of the first motor (3) is coaxially fixedly connected to the cutting head (31); A rotating belt (6) is rotatably matched on the support tube (1), a plurality of brackets (12) of adjustable length are fixedly connected to the rotating belt (6), and a roller (13) is hingedly connected to one end of the bracket (12) away from the rotating belt (6); a second motor (61) is fixedly connected inside the support tube (1), and an output shaft of the second motor (61) is fixedly connected to the rotating belt (6); A first speed sensor and a second speed sensor are connected to the output shafts of the first motor (3) and the second motor (61), respectively, the first speed sensor is used to measure first speed information corresponding to the first motor (3), and the second speed sensor is used to measure second speed information corresponding to the second motor (61), and the first speed information and the second speed information are sent to the control panel; The control panel is used to input and store the hardness information of the current casing and the casing diameter of the current casing, generate a processing depth instruction based on the casing diameter and send it to the electric push rod (33); then generate a first standard speed corresponding to the first motor (3) and a second standard speed corresponding to the second motor (61) based on the hardness information, and send the first standard speed and the second standard speed to the first motor (3) and the second motor (61) respectively; and at the same time generate a standard pressure corresponding to the water pump (52) based on the hardness information, and send the standard pressure to the water pump (52).

4. The downhole casing cutting device according to claim 3, characterized in that: The screening mechanism comprises a recovery groove (11) connected to the return groove (21), the recovery groove (11) is arranged on the support pipe (1), and the injection head (5) is located in the recovery groove (11); A side of the return groove (21) away from the recovery groove (11) is higher than a side of the return groove (21) close to the recovery groove (11); a filter screen (4) connected to the grinding mechanism is arranged in the recovery groove (11); a pressure sensor is provided at the bottom of the filter screen (4) for measuring real-time weight data of residual metal particles on the filter screen (4), and the real-time weight data is sent to a control panel.

5. The downhole casing cutting device according to claim 4, characterized in that: The grinding mechanism comprises a testing groove (23) located below the return groove (21), one side of the testing groove (23) is connected to the recovery groove (11), and an inclined docking groove (25) is connected between the testing groove (23) and the recovery groove (11); A crushing roller (7) is provided in the recovery tank (11), the crushing roller (7) is located below the filter screen (4), a third motor is coaxially connected to one side of the crushing roller (7), the third motor and the support tube (1) are clearance-matched, and an elastic layer is fixedly connected between the third motor and the support tube (1); a snap-fit ​​block (71) is rotatably matched on the side of the crushing roller (7) away from the third motor, the snap-fit ​​block (71) is located below the docking tank (25), and a transfer chamber is opened in the support tube (1), and the snap-fit ​​block (71) is located in the transfer chamber; The transfer chamber is respectively connected to the recovery tank (11) and the docking tank (25), and a transfer pipe (54) is also connected between the transfer chamber and the water pump (52), and the discharge end of the water pump (52) is connected to the transfer pipe (54); The control panel is also used to obtain a comparison value corresponding to the pressure sensor based on the hardness information of the current casing, compare the comparison value with the real-time weight data, and if the real-time weight data is greater than the comparison value, send a pressure increase instruction to the water pump (52); if the real-time weight data is less than the comparison value, send a maintenance instruction to the water pump (52).

6. The downhole casing cutting device according to claim 5, characterized in that: The side of the docking groove (25) close to the inspection groove (23) is higher than the side of the docking groove (25) away from the inspection groove (23).

7. The downhole casing cutting device according to claim 6, characterized in that: The bracket (12) comprises a first rod and a second rod which are slidably matched with each other, the diameter of the first rod is smaller than the diameter of the second rod, threaded holes are formed on the first rod and the second rod, screws are connected in the threaded holes, and the first rod and the second rod are fixedly connected by the screws.

8. The downhole casing cutting device according to claim 7, characterized in that: The inspection tank (23) is also provided with a turbidity sensor (24) for real-time detection of water turbidity, and the water turbidity is sent to the control panel; The control panel is used to compare the turbidity of the water flow with a set first standard value, and if the turbidity of the water flow is greater than the first standard value, a mitigation instruction is sent to the second motor (61); if the turbidity of the water flow is less than the first standard value, a maintenance instruction is sent to the second motor (61).

9. The downhole casing cutting device according to claim 8, characterized in that: The control panel is also used to calculate the difference between the water turbidity in the current time period and the water turbidity before the current time period when no parameter changes occur in the first motor (3), the second motor (61) and the water pump (52), compare the difference with a set second standard value, and if the difference is greater than the second standard value, send a warning instruction to the outside world; if the difference is less than the second standard value, send a verification pass instruction to the outside world.

10. A method for using a downhole casing cutting device, characterized in that: The method for using the downhole casing cutting device according to any one of claims 1 to 9 comprises the following steps: step 1, based on the material and properties of the casing, replacing the corresponding cutting head (31) and adjusting the length of the bracket (12) to form a stable support; Step 2: saving processing parameter information during casing processing to a control panel, wherein the processing parameter information includes parameter information corresponding to the first motor (3), the second motor (61) and the water pump (52); Step 3: The roller (13) on the rotating belt (6) is driven forward by the second motor (61), and then the cutting head (31) pre-grinds the groove to form a groove to be processed, and the abrasive is recycled through the screening mechanism and the grinding mechanism; at the same time, the abrasive jet is ejected through the ejector head (5) to enlarge the groove to be processed; Step 4: The control panel adjusts the pressure of the water pump (52) based on the real-time weight data, and the control panel controls the second motor (61) or issues a warning command to the outside world based on the turbidity of the water flow measured by the turbidity sensor (24).

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