Drill bit balling drum removal cleaning control device, drill bit balling drum removal cleaning device and drill bit

Abstract

The invention discloses a drill bit mud drum removal cleaning control device, a drill bit mud drum removal cleaning device and a drill bit, and relates to the technical field of drilling tools. The piston is movably connected to the liquid storage tank, the circumferential side wall of the piston makes circumferential contact with the inner wall of the liquid storage tank and divides the interior of the liquid storage tank into a first cavity and a second cavity, one end of the piston is fixedly connected with a probe, and the central axis of the liquid storage tank, the central axis of the probe and the central axis of the piston are collinear with the axis of the drill bit body. The piston can slide in the direction parallel to the central axis of the liquid storage tank and enables the probe to stretch out of the liquid storage tank and the drill bit body from the second cavity, a liquid outlet is formed in the first cavity and communicates with a liquid flow meter, the liquid flow meter is in communication connection with a controller, and the controller is used for controlling the cleaning device; the cleaning device comprises a water distribution pipeline and a cleaning control device; the drill bit comprises a drill bit body and a cleaning device. The drilling efficiency of the drill bit is improved by improving the judgment accuracy of the drilling rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling tools, in particular to a drill bit mud cake cleaning control device, a drill bit mud cake cleaning device and a drill bit. BACKGROUND

[0002] In the process of drilling for oil and gas or natural gas, the drill bit will be wrapped in mud (referred to as mud cake) when drilling or tripping, and the presence of mud cake will reduce the footage efficiency without damaging the drill bit. In order to solve this problem, the existing drill bit adopts the way of increasing the plugging mechanism and the mud removal eye, the mud removal eye is aligned with the wing that is easy to produce mud cake, the plugging mechanism blocks the mud removal eye when the wing is not cleaned, and the plugging mechanism opens the mud removal eye when the wing needs to be cleaned. However, this way needs manual intervention on the ground to determine whether mud cake needs to be removed and to operate to remove mud cake. If the manual intervention is not timely, it will affect the drilling efficiency to some extent. SUMMARY

[0003] The purpose of the present application is to provide a drill bit mud cake cleaning control device, a drill bit mud cake cleaning device and a drill bit to solve the problems existing in the prior art and improve the accuracy of drilling rate judgment and the drilling efficiency of the drill bit.

[0004] To achieve the above purpose, the present application provides the following scheme: The present application provides a drill bit mud cake cleaning control device, which comprises a probe, a piston, a liquid storage tank, a liquid flow meter and a controller. The liquid storage tank is fixedly arranged in the drill bit body. The piston is movably connected in the liquid storage tank, and the circumferential side wall of the piston is in circumferential contact with the inner wall of the liquid storage tank and separates the inside of the liquid storage tank into a first cavity and a second cavity. One end of the piston is fixedly connected with the probe, and the central axis of the liquid storage tank, the central axis of the probe and the central axis of the piston are all collinear with the axis of the drill bit body. The piston can slide along the direction parallel to the central axis of the liquid storage tank and make the probe extend out of the liquid storage tank and the drill bit body from the second cavity. The first cavity is provided with a liquid outlet, the liquid outlet is communicated with the liquid flow meter, the liquid flow meter is in communication connection with the controller, and the controller is used for controlling the cleaning device.

[0005] In one embodiment, it further comprises a liquid supply bin, a first connecting pipe and a second connecting pipe. The liquid supply bin is fixedly arranged inside the drill bit body. The first connecting pipe is communicated between the liquid outlet and the liquid supply bin. The liquid flow meter is arranged on the first connecting pipe. The second connecting pipe is communicated between the second cavity and the liquid supply bin.

[0006] In one embodiment, further comprising a pumping device arranged on the first connecting pipe and capable of pumping liquid from the liquid supply bin to the liquid storage tank, the pumping device being signal connected with the controller.

[0007] In one embodiment, further comprising a turbine generator and a battery, the turbine generator having a housing fixedly arranged in a cavity formed in the interior of the drill bit body, the turbine generator having a turbine arranged in the drilling fluid channel of the drill bit body and a generator connected with the battery and capable of providing electric energy to the battery, the pumping device and the controller being electrically connected with the battery.

[0008] In one embodiment, further comprising a gland arranged at one end of the cavity away from the drill bit body and capable of tightly fixing the housing of the turbine generator in the cavity, the gland having a channel formed therein and capable of allowing drilling fluid to pass through and enter the cavity to contact the turbine and rotate the turbine.

[0009] The present application provides a drill bit mud cake cleaning device, which comprises a cleaning device and the drill bit mud cake cleaning control device described above, the cleaning device comprising a plurality of water distribution pipes and a plurality of blocking devices, the inlet of each water distribution pipe being in communication with the drilling fluid channel, the outlet of each water distribution pipe being capable of being in communication with the outside of the drill bit body, each water distribution pipe being provided with a blocking device corresponding thereto, each blocking device having a first state and a second state, the controller being signal connected with each blocking device and capable of switching the blocking device between the first state and the second state, the blocking device in the first state being capable of opening the water distribution pipe to allow drilling fluid to flow to the outside of the drill bit body and flush the cutting teeth, the blocking device in the second state being capable of blocking the water distribution pipe to cut off the path of drilling fluid flowing to the outside of the drill bit body.

[0010] In one embodiment, the blocking device comprises a driving device and a plug, each plug being slidingly arranged in a sliding groove, each sliding groove being provided with a communication port, each communication port being in communication with one water distribution pipe, the outlet of each sliding groove being used to communicate with the outside of the drill bit body, the driving device being signal connected with the controller, the driving device driving the plug to move to open or block the communication port.

[0011] In one embodiment, the driving device comprises a motor, a first gear, a ring gear, a bearing, a plurality of second gears and a plurality of screws, the motor is electrically connected with the battery, the motor is fixedly arranged in the drill bit body, the output shaft of the motor is drivingly connected with the first gear, the ring gear has a first gear ring and a second gear ring at two ends respectively, the first gear is engaged with the first gear ring, the second gear ring is engaged with a plurality of the second gears, the ring gear is rotatably connected in the drill bit body through the bearing around the central axis of the drill bit body, each second gear is rotatably connected in a first limiting groove of the drill bit body, each second gear is coaxially and threadedly connected with a screw, each screw is slidingly connected in a second limiting groove of the drill bit body along the axis of the drill bit body, the bottom end of each screw is fixedly connected with a plug, and the motor is signal connected with the controller.

[0012] The present application provides a drill bit, comprising a drill bit body and the drill bit mud cake cleaning device, the inside of the drill bit body is provided with a drilling fluid channel, and the drilling fluid channel is used for passing drilling fluid to the outside close to the central axis of the drill bit body.

[0013] In one embodiment, a protective shell is further included, which is used for detachably sleeving the control nipple of the drill bit body.

[0014] The present application has the following technical effects compared with the prior art: The present application provides a drill bit mud cake cleaning control device, the probe is collinear with the central axis of the liquid storage tank and stably slides with the piston, can be accurately inserted into the soft rock and soil layer along the central axis direction of the drill bit body, can ensure that the probe is always inserted into the soft rock and soil layer and does not change the position with the drilling of the drill bit body; the circumferential side wall of the piston is in circumferential contact with the inner wall of the liquid storage tank, which can avoid liquid leakage, when not drilling, the liquid is introduced into the first cavity, the introduced liquid pushes down the probe through the piston, so that the probe is inserted into the soft rock and soil layer, in the drilling state, the liquid storage tank moves downward with the drilling of the drill bit body, so that the position of the probe relative to the liquid storage tank moves upward, and the liquid is discharged from the first cavity; in the drilling state, when the liquid storage tank moves downward to discharge the liquid, the liquid flow meter can measure the liquid discharge rate in real time, which can indirectly reflect the drilling rate, when the drilling speed is fast, the moving speed of the piston in the liquid storage tank is fast, which leads to the fast flow rate of the discharged liquid, the liquid flow rate measured by the liquid flow meter is fast, and the controller does not need to be used to open the cleaning device to clean the drill bit body; when the drill bit body is wrapped by the mud cake, the drilling speed of the drill bit body is slow, which leads to the slow moving speed of the piston in the liquid storage tank, resulting in the slow flow rate of the discharged liquid, the liquid flow rate measured by the liquid flow meter is slow, and the controller needs to be used to open the cleaning device to clean the drill bit body. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0016] Figure 1 It is an external structure diagram of the drill bit of the present application. Figure 2 It is Figure 1 It is an A-A sectional view of the drill bit. Figure 3 It is a structure diagram of the driving device of the drill bit mud cake cleaning device in the embodiment 2 of the present application. In the figure: 1, probe; 2, piston; 3, liquid storage tank; 4, controller; 5, liquid supply bin; 6, first connecting pipe; 7, second connecting pipe; 8, pumping device; 9, turbine generator; 10, battery; 11, gland; 12, water distribution pipeline; 13, plug; 14, motor; 15, first gear; 16, ring gear; 17, bearing; 18, second gear; 19, screw; 20, drilling fluid channel; 21, protective shell; 22, anti-drop pin bolt. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0018] The purpose of the present application is to provide a drill bit mud cake cleaning control device, a drill bit mud cake cleaning device and a drill bit, so as to solve the problems in the prior art, and to improve the drilling efficiency of the drill bit by improving the accuracy of the drilling rate judgment.

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.

[0020] Embodiment 1 As Figures 1-2As shown, the embodiment discloses a drill bit mud cake cleaning control device, which comprises a probe 1, a piston 2, a liquid storage tank 3, a liquid flow meter and a controller 4. The liquid storage tank 3 is fixedly arranged in the drill bit body. The piston 2 is movably connected in the liquid storage tank 3. The circumferential side wall of the piston 2 is in circumferential contact with the inner wall of the liquid storage tank 3 and separates the liquid storage tank 3 into a first cavity and a second cavity. One end of the piston 2 is fixedly connected with the probe 1. The central axis of the liquid storage tank 3, the central axis of the probe 1 and the central axis of the piston 2 are all collinear with the axis of the drill bit body. The piston 2 can slide along the direction parallel to the central axis of the liquid storage tank 3 and make the probe 1 extend out of the liquid storage tank 3 and the drill bit body from the second cavity. The first cavity is provided with a liquid outlet. The liquid outlet is communicated with the liquid flow meter. The liquid flow meter is in communication connection with the controller 4. The controller 4 is used for controlling the cleaning device.

[0021] The probe 1 is collinear with the central axis of the liquid storage tank 3 and stably slides with the piston 2. The probe 1 can be accurately inserted into the soft rock and soil layer along the central axis direction of the drill bit body. The position of the probe 1 can be kept in the soft rock and soil layer and does not change with the drilling of the drill bit body. The circumferential side wall of the piston 2 is in circumferential contact with the inner wall of the liquid storage tank 3, which can avoid liquid leakage. When not drilling, the liquid is introduced into the first cavity. The introduced liquid pushes the probe 1 downward through the piston 2, so that the probe 1 is inserted into the soft rock and soil layer. In the drilling state, the liquid storage tank 3 moves downward with the drilling of the drill bit body, which causes the position of the probe 1 to move upward relative to the liquid storage tank 3. The liquid is discharged from the first cavity. In the drilling state, when the liquid storage tank 3 moves downward to discharge the liquid, the liquid flow meter can measure the liquid discharge rate in real time, which can indirectly reflect the drilling rate. When the drilling speed is fast, the moving speed of the piston 2 in the liquid storage tank 3 is fast, which causes the flow rate of the discharged liquid to be fast. The liquid flow rate measured by the liquid flow meter is fast, so the controller 4 does not need to open the cleaning device to clean the drill bit body. When the drill bit body is wrapped by the mud cake, the drilling speed of the drill bit body is slow, which causes the moving speed of the piston 2 in the liquid storage tank 3 to be slow, resulting in the slow flow rate of the discharged liquid. The liquid flow rate measured by the liquid flow meter is slow, so the controller 4 needs to open the cleaning device to clean the drill bit body.

[0022] In one embodiment, the device further comprises a liquid supply bin 5, a first connecting pipe 6 and a second connecting pipe 7. The liquid supply bin 5 is fixedly arranged in the drill bit body. The first connecting pipe 6 is communicated with the liquid outlet and the liquid supply bin 5. The liquid flow meter is arranged on the first connecting pipe 6. The second connecting pipe 7 is communicated with the second cavity and the liquid supply bin 5.

[0023] The first connecting pipe 6 connects the liquid outlet and the liquid supply bin 5. In the initial state, the liquid in the liquid supply bin 5 can be supplied into the liquid storage tank 3. In the drilling state, the liquid in the liquid storage tank 3 can be returned to the liquid supply bin 5, and the liquid flow meter can measure the return rate of the liquid. The second connecting pipe 7 connects the second cavity and the liquid supply bin 5. In the drilling state, the liquid in the liquid supply bin 5 can be supplied into the liquid storage tank 3, so as to maintain the dynamic stability of the total amount of liquid in the liquid storage tank 3 and avoid the flow rate measurement error caused by the fluctuation of the liquid amount.

[0024] In an embodiment, the pumping device 8 is arranged on the first connecting pipe 6 and can transport the liquid from the liquid supply bin 5 to the liquid storage tank 3. The pumping device 8 is signal connected with the controller 4.

[0025] When the drilling state is not reached, the controller 4 needs to send a signal to open the pumping device 8, so that the pumping device 8 supplies the liquid in the liquid supply bin 5 into the liquid storage tank 3. The liquid in the liquid storage tank 3 pushes the probe 1 to the end of the liquid storage tank 3 and moves out of the drill body, and the pumping device 8 is closed.

[0026] Further, the pumping device 8 can be a pumping pump. The inlet of the pumping pump is connected with the liquid supply bin 5, and the outlet of the pumping pump is connected with the first connecting pipe 6. When the liquid in the liquid storage tank 3 needs to be transported, that is, when the drill body is in the non-drilling state, the controller 4 only needs to send a signal to the pumping pump to open the pumping pump to transport the liquid in the liquid supply bin 5 into the liquid storage tank 3 through the first connecting pipe 6.

[0027] In an embodiment, the turbine generator 9 and the battery 10 are further included. The shell of the turbine generator 9 is fixedly arranged in the cavity formed in the interior of the drill body. The turbine generator 9 has a turbine and a generator. The turbine is arranged in the drilling fluid channel 20 of the drill body. The generator is connected with the battery 10 and can provide electric energy for the battery 10. The pumping device 8 and the controller 4 are electrically connected with the battery 10.

[0028] The turbine generator 9 can convert the kinetic energy of the drilling fluid into mechanical energy. The drilling fluid passes through the turbine. The center of the turbine and the center of the generator are collinear with the central axis of the drill body, which can better utilize the drilling fluid and improve the efficiency of power generation. The turbine converts the kinetic energy of the drilling fluid into mechanical energy, and then the generator converts the mechanical energy into electric energy and stores the electric energy in the battery 10. The battery 10 is electrically connected with the pumping device 8 and the controller 4 to provide electric energy support for them, which can directly provide electric energy and save energy.

[0029] In one embodiment, a pressure cap 11 is also included. The pressure cap 11 is fixedly disposed in the cavity at one end away from the drill bit body and can press and fix the housing of the turbine generator 9 in the cavity. The pressure cap 11 has a channel that allows drilling fluid to pass through. The drilling fluid can enter the cavity through the channel to contact the turbine and make the turbine rotate.

[0030] The pressure cap 11 is fixedly connected to the housing of the turbine generator 9 and also to the drill bit body to prevent the turbine generator 9 from coming off and to ensure the stability of the turbine generator 9.

[0031] Example 2 This embodiment provides a drill bit desliming and cleaning device, such as... Figure 3 As shown, the device includes a cleaning apparatus and a drill bit desliming bag cleaning control device according to Embodiment 1. The cleaning apparatus includes several water distribution pipes 12 and several sealing devices. The inlet of each water distribution pipe 12 is connected to the drilling fluid channel 20, and the outlet of each water distribution pipe 12 is connected to the outside of the drill bit body. Each water distribution pipe 12 is respectively provided with a sealing device. Each sealing device has a first state and a second state. The controller 4 is signal-connected to each sealing device and can switch the sealing device between the first state and the second state. The sealing device in the first state can open the water distribution pipe 12 to allow the drilling fluid to flow to the outside of the drill bit body and flush the cutting teeth. The sealing device in the second state can block the water distribution pipe 12 to cut off the path of the drilling fluid to the outside of the drill bit body.

[0032] This embodiment discloses a cleaning device in which a plurality of water distribution pipes 12 are connected to a drilling fluid channel 20. When it is necessary to remove mud from the drill bit body, the controller 4 is used to send a signal to the sealing device to put the sealing device in a first state to open the water distribution pipes 12, so that the drilling fluid can flow out through the water distribution pipes 12 and flush the drill bit body. When it is not necessary to remove mud from the drill bit body, the controller 4 is used to send a signal to the sealing device to put the sealing device in a second state to block the water distribution pipes 12, so that the drilling fluid cannot pass through.

[0033] In one embodiment, the sealing device includes a drive device and plugs 13. Each plug 13 is slidably disposed in a groove. Each groove is provided with a connecting port, and each connecting port is connected to a water distribution pipe 12. The outlet of each groove is used to connect to the outside of the drill bit body. The drive device is signal-connected to the controller 4. The drive device drives the plugs 13 to move, which can open or seal the connecting ports.

[0034] When the drilling tool is not in use and the controller 4 does not send a signal to clean the drill bit body, the plug 13 is driven by the driving device to slide towards the end close to the rock-soil layer to block the water distribution pipe 12, so that the plug 13 blocks the water distribution pipe 12, and the drilling fluid flows out through the drilling fluid channel 20 but not through the chute; when the drilling tool is in use and the controller 4 sends a signal to clean the drill bit body, the plug 13 is driven by the driving device to slide towards the end away from the rock-soil layer to open the water distribution pipe 12, so that the drilling fluid can flow out through the chute and wash the drill bit body.

[0035] In one embodiment, the driving device includes a motor 14, a first gear 15, an annular gear 16, a bearing 17, a plurality of second gears 18, and a plurality of screws 19. The motor 14 is electrically connected to the battery 10 and is fixedly arranged inside the drill bit body. The output shaft of the motor 14 is transmissionally connected with the first gear 15. The annular gear 16 has a first gear ring and a second gear ring at two ends thereof. The first gear 15 is engaged with the first gear ring. The second gear ring is engaged with the plurality of second gears 18. The annular gear 16 is rotationally connected inside the drill bit body around the central axis of the drill bit body through the bearing 17. Each second gear 18 is rotationally connected in a first limiting slot of the drill bit body. Each second gear 18 is coaxially and threadedly connected with a screw 19. Each screw 19 is slidingly connected in a second limiting slot of the drill bit body along the axis of the drill bit body. The bottom end of each screw 19 is fixedly connected with a plug 13. The motor 14 is signal-connected with the controller 4.

[0036] The arrangement of only one motor 14 can reduce the power source and reduce the use and maintenance costs. The motor 14 drives the first gear 15 to rotate, and the annular gear 16 engaged with the first gear 15 also rotates. The second gear ring of the annular gear 16 drives the plurality of second gears 18 engaged therewith to rotate. The screw 19 engaged with the second gear 18 rises, thereby driving the plug 13 to rise and opening the water distribution pipe 12. Conversely, the screw 19 is driven to descend, thereby driving the plug 13 to descend and blocking the water distribution pipe 12.

[0037] Further, the bearing 17 is selected to have a two-piece structure for easy installation. The annular gear 16 also has a two-piece structure for easy installation. The lower end of the annular gear 16 is provided with a limiting block to prevent the annular gear 16 from being pulled out upward during rotation.

[0038] Embodiment 3 The present embodiment provides a drill bit, as shown in the accompanying drawings, which comprises a drill bit body and the cleaning device of embodiment 2. The inside of the drill bit body is provided with a drilling fluid channel 20 for passing drilling fluid to the outside close to the central axis of the drill bit body. Figures 1-2 The present embodiment provides a drill bit, as shown in the accompanying drawings, which comprises a drill bit body and the cleaning device of embodiment 2. The inside of the drill bit body is provided with a drilling fluid channel 20 for passing drilling fluid to the outside close to the central axis of the drill bit body.

[0039] The embodiment discloses a drill bit, the drill bit is drilled, drilling fluid flows to the outside of the drill bit body through the drilling fluid channel 20, and the drilling fluid flows out of the drill bit body to assist in completing the drilling work.

[0040] In one embodiment, a protective shell 21 is further included, and the protective shell 21 is used to detachably cover the control nipple outside the drill bit body.

[0041] The protective shell 21 arranged outside the drill bit body can physically protect the control nipple, reduce direct friction and collision between the drill bit body and the well wall, rock and the like during drilling, and prevent the surface of the drill bit body from being damaged.

[0042] Further, the protective shell 21 is connected with the drill bit body through the anti-coming-off pin bolt 22, the bottom end of the protective shell 21 is in a sawtooth structure, and relative sliding between the protective shell 21 and the drill bit body is prevented.

[0043] The principle and implementation mode of the present application are described by applying specific examples in the present application, and the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A drill bit mud removal and cleaning control device, characterized in that: The device includes a probe, a piston, a reservoir, a flow meter, and a controller. The reservoir is fixedly installed within the drill bit body. The piston is movably connected within the reservoir, and its circumferential sidewall contacts the inner wall of the reservoir, dividing the reservoir into a first chamber and a second chamber. One end of the piston is fixedly connected to the probe. The central axes of the reservoir, the probe, and the piston are all collinear with the axis of the drill bit body. The piston can slide parallel to the central axis of the reservoir, allowing the probe to extend from the second chamber into the reservoir and the drill bit body. The first chamber has an outlet connected to the flow meter, which is communicatively connected to the controller. The controller controls the cleaning device.

2. The drill bit desliming and cleaning control device according to claim 1, characterized in that: It also includes a liquid supply chamber, a first connecting pipe and a second connecting pipe. The liquid supply chamber is fixedly installed inside the drill bit body. The first connecting pipe connects the liquid outlet and the liquid supply chamber. The liquid flow meter is installed on the first connecting pipe. The second connecting pipe connects the second cavity and the liquid supply chamber.

3. The drill bit desliming and cleaning control device according to claim 2, characterized in that: It also includes a pumping device, which is disposed on the first connecting pipe and is capable of transporting liquid from the liquid supply chamber to the liquid storage tank. The pumping device is signal-connected to the controller.

4. The drill bit desliming and cleaning control device according to claim 3, characterized in that: It also includes a turbine generator and a battery. The casing of the turbine generator is fixedly disposed in a cavity opened inside the drill bit body. The turbine generator has a turbine and a generator. The turbine is placed in the drilling fluid channel of the drill bit body. The generator is connected to the battery and can provide power to the battery. The pumping device and the controller are both electrically connected to the battery.

5. The drill bit desliming and cleaning control device according to claim 4, characterized in that: It also includes a pressure cap, which is fixedly installed in the cavity at one end away from the drill bit body and can press and fix the housing of the turbine generator in the cavity. The pressure cap has a channel that allows drilling fluid to pass through, and the drilling fluid can enter the cavity through the channel to contact the turbine and make the turbine rotate.

6. A drill bit mud removal and cleaning device, characterized in that: The invention includes a cleaning device and a drill bit desliming bag cleaning control device as described in any one of claims 1-5. The cleaning device includes a plurality of water distribution pipes and a plurality of sealing devices. The inlet of each water distribution pipe is connected to the drilling fluid channel, and the outlet of each water distribution pipe is connected to the outside of the drill bit body. Each water distribution pipe is respectively provided with a sealing device. Each sealing device has a first state and a second state. The controller is signal-connected to each sealing device and can switch the sealing device between the first state and the second state. The sealing device in the first state can open the water distribution pipe to allow drilling fluid to flow to the outside of the drill bit body and flush the cutting teeth. The sealing device in the second state can block the water distribution pipe to cut off the path of drilling fluid to the outside of the drill bit body.

7. The drill bit desliming and cleaning device according to claim 6, characterized in that: The sealing device includes a driving device and a plug. Each plug is slidably disposed in a groove. Each groove is provided with a connecting port, and each connecting port is connected to a water distribution pipe. The outlet of each groove is used to connect to the outside of the drill bit body. The driving device is signal-connected to the controller. The driving device drives the plug to move, which can open or block the connecting port.

8. The drill bit desliming and cleaning device according to claim 7, characterized in that: The driving device includes a motor, a first gear, a ring gear, a bearing, several second gears, and several screws. The motor is electrically connected to the battery and is fixedly installed inside the drill bit body. The output shaft of the motor is drivenly connected to the first gear. The ring gear has a first gear ring and a second gear ring at its two ends, respectively. The first gear meshes with the first gear ring, and the second gear ring meshes with several second gears. The ring gear is rotatably connected to the inside of the drill bit body around the central axis of the drill bit body through the bearing. Each second gear is rotatably connected to a first limiting groove opened in the drill bit body. Each second gear is coaxially threaded to a screw. Each screw is slidably connected to a second limiting groove opened in the drill bit body along an axis parallel to the drill bit body. A plug is fixedly connected to the bottom end of each screw. The motor is signal-connected to the controller.

9. A drill bit, characterized in that: The drill bit body includes a drilling fluid channel inside the drill bit body, which is used to allow drilling fluid to pass through to the outside of the drill bit body near the central axis. And the drill bit desliming and cleaning device according to any one of claims 6-8.

10. The drill bit according to claim 9, characterized in that: It also includes a protective housing, which is detachably fitted onto the control section of the drill bit body.

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