A continuous circulation drilling tool

Abstract

The application discloses a kind of continuous circulation drilling tools, belongs to drilling tool technical field, including the drill pipe of power output end of drilling equipment installation, the drill pipe is connected with drill bit by thread in one end, and the inside of drill pipe is installed with mud generator mechanism, the outside of drill pipe is provided with reaming assembly, the shell one of reaming assembly is fixedly installed in the outside of drill pipe, the inside of shell one is installed with three electric push rods one, one end of electric push rod one is rotatably connected with soil breaking plate and penetrates shell one, one end of soil breaking plate is installed with connecting piece, three electric push rods one act on three soil breaking plates and form the expansion shape of big lower and small upper to ream hole to well wall when drilling tool is recycled;The application can make drilling tool reach multiple use states and effects by changing different inclination angles of soil breaking plate, can cope with multiple drilling work needs, improve the work adaptability of drilling tool.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and more particularly to a continuous circulation drilling tool. Background Technology

[0002] Petroleum resources are widely used in many fields as an important energy source. Petroleum resources are buried deep underground, and drilling tools are needed to explore their location to facilitate subsequent mining operations. Existing drilling methods are generally divided into vertical drilling and horizontal drilling. Horizontal drilling can better explore underground oil resources, which requires the use of rotary steering technology in the oil drilling industry, so that the drill bit can change the drilling direction as needed.

[0003] After drilling is completed, the drilling tools need to be retrieved. However, since the drilling path of rotary steerable drilling is not a straight line, the drill bit may get stuck at corners during retrieval, affecting the retrieval efficiency. Traditional drilling tools lack corresponding reaming tools to enlarge the corners during retrieval. At the same time, when the drilling tool is rotated and guided, the pressure on its side increases due to the deviation in its forward direction, causing the drill bit to shake and affecting the drilling accuracy. Summary of the Invention

[0004] The purpose of this invention is to solve the problems that existing drilling tools are prone to getting stuck at corners during retrieval, and that the drill bit shakes due to increased lateral pressure during rotational guidance. Therefore, a continuous circulation drilling tool is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A continuous circulation drilling tool includes a drill rod installed at the power output end of a drilling equipment, one end of which is connected to a drill bit via a thread, and a mud generator mechanism is installed inside the drill rod, while a hole-reaming assembly is provided outside the drill rod. The hole enlarging assembly includes a housing fixedly installed outside the drill pipe. Inside the housing, three electric push rods are installed. One end of each electric push rod passes through the housing and is rotatably connected to a soil-breaking plate. One end of the soil-breaking plate is equipped with a connector. When the drilling tool is retrieved, the three electric push rods act on the three soil-breaking plates to form an expanded shape that is smaller at the top and larger at the bottom, thus enlarging the hole in the well wall.

[0007] As a further description of the above technical solution: The outer shell has three grooves (one) and three grooves (two) on its exterior.

[0008] As a further description of the above technical solution: The drill pipe is equipped with a control component on its exterior. The control component includes a second outer shell and a first liquid storage box fixedly mounted on the drill pipe. A fixing tube is installed inside the second outer shell. The inside of the fixing tube is divided into upper and lower layers by a storage cavity with an electric push rod II installed and a liquid storage cavity with a piston I slidably mounted inside. One end of the electric push rod II is fixedly connected to the piston I. A solenoid valve is connected to the bottom of the liquid storage cavity, and an outlet pipe and an inlet pipe are installed on the solenoid valve.

[0009] As a further description of the above technical solution: The control component also includes a liquid storage box 2 installed inside the outer casing 1. The interior of the liquid storage box 2 is evenly divided into three hydraulic chambers by three arc-shaped partitions, and liquid guide pipes are provided on the arc-shaped partitions. A piston 2 is slidably arranged inside the hydraulic chamber. Two springs 1 are arranged between the top of the piston 2 and the inner top surface of the liquid storage box 2.

[0010] As a further description of the above technical solution: The connector passes through the liquid storage box 2 and the piston 2 for fixed connection, and the liquid storage box 2 is provided with three sealing gaskets. The top of the liquid storage box 1 is penetrated by one end of the liquid outlet pipe, and the outer side of the drill rod is penetrated and fixedly connected by one end of the liquid inlet pipe.

[0011] As a further description of the above technical solution: The lower outlets of the three liquid guide tubes are matched with the positions of the three hydraulic chambers, and the upper ends of the liquid guide tubes pass through the second liquid storage box and the first outer shell in sequence, connecting to the bottom of the first liquid storage box.

[0012] As a further description of the above technical solution: The inner side of the outer shell 2 is provided with three electric push rods 3, and the output end of the electric push rods 3 passes through the top of the liquid storage box 1 and is fixedly connected to a sealing plate. Under the action of the electric push rods 3, the three sealing plates control the opening and closing of the upper inlet of the three liquid guide tubes.

[0013] As a further description of the above technical solution: One end of the electric push rod is provided with a buffer assembly. The buffer assembly includes a fixed plate fixedly installed on one end of the electric push rod. A damper is fixedly installed on the fixed plate. A caster wheel is rotatably installed on one end of the damper. A spring is provided between the fixed plate and one end of the damper. The fixed plate and the groove on the outer shell are adaptively matched.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: By coordinating the reaming, control, and buffer components, the drilling tool can achieve multiple working states according to drilling needs, with different states providing different effects, thus improving its adaptability. Two electric actuators act on a sealing plate to seal the upper inlets of the corresponding two fluid guides, allowing mud to enter only one hydraulic chamber. This controls a corresponding breaking plate to apply pressure to the well wall. The reaction force from the well wall pushes the drilling tool in the opposite direction, achieving rotational guidance. During drilling, electric actuator 2 acts on piston 1 to change the mud level in the reservoir, which also changes the angle of the breaking plate. A downward movement of piston 1 causes piston 2 in one of the three hydraulic chambers to move upward, expanding the breaking plate outward and increasing the drilling diameter, thus achieving a reaming effect. Simultaneously, when the drilling tool encounters a corner during retrieval, the position of the breaking plate can be controlled via an electric push rod, causing the breaking plate to tilt to another angle. This allows it to work in conjunction with external power equipment for reverse hole reaming during retrieval, preventing the drilling tool from getting stuck. Whether the drilling tool is drilling or reaming in the reverse direction during retrieval, the casters, under the action of dampers and springs, always remain in contact with the well wall, buffering the forces on the drill bit and preventing it from swaying due to well wall pressure, which could affect drilling accuracy. Attached Figure Description

[0015] Figure 1 An overall side sectional view according to an embodiment of the present invention is shown; Figure 2 A perspective structural diagram of the outer casing 2 provided according to an embodiment of the present invention is shown; Figure 3 A cross-sectional perspective structural diagram of a liquid storage box 1 and a housing 2 provided according to an embodiment of the present invention is shown; Figure 4 A cross-sectional perspective view of the fixed tube provided according to an embodiment of the present invention is shown; Figure 5 A three-dimensional structural diagram of the liquid guide tube and the arc-shaped baffle provided according to an embodiment of the present invention is shown; Figure 6 A three-dimensional structural schematic diagram of the liquid storage box II provided according to an embodiment of the present invention is shown; Figure 7 A three-dimensional structural schematic diagram of a caster wheel provided according to an embodiment of the present invention is shown; Figure 8 A cross-sectional three-dimensional structural schematic diagram of the overall structure provided according to an embodiment of the present invention is shown; Figure 9 The diagram shows a demonstration of three soil-breaking plates provided according to an embodiment of the present invention during well drilling using a drilling tool; Figure 10 A diagram illustrating the rotational guidance of a single soil-breaking plate applying pressure to a well wall according to an embodiment of the present invention is shown. Figure 11 The diagram illustrates the use of three ground-breaking plates, provided by an embodiment of the present invention, to enlarge holes at bends during the retrieval of drilling tools. Figure 12 A front view of the overall structure provided according to an embodiment of the present invention is shown; Figure 13 A three-dimensional structural diagram of the overall structure provided according to an embodiment of the present invention is shown.

[0016] Legend: 10. Drill rod; 20. Reamer assembly; 30. Control assembly; 40. Buffer assembly; 11. Drill bit; 12. Mud generator mechanism; 13. Electric push rod one; 14. Electric push rod two; 21. Outer shell one; 22. Soil-breaking plate; 23. Connector; 24. Sealing gasket; 25. Groove one; 26. Groove two; 31. Outer shell two; 32. Liquid storage box one; 33. Fixing pipe; 34. Storage cavity; 35. Liquid storage cavity; 36. Piston one; 37. Solenoid valve; 38. Liquid outlet pipe; 39. Liquid inlet pipe; 310. Liquid storage box two; 311. Arc-shaped partition; 312. Liquid guide pipe; 313. Piston two; 314. Spring one; 315. Electric push rod three; 316. Sealing plate; 41. Fixing plate; 42. Damper; 43. Caster wheel; 44. Spring two. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 - Figure 13 As shown, the present invention provides: A continuous circulation drilling tool includes a drill pipe 10 installed at the power output end of a drilling equipment. One end of the drill pipe 10 is connected to a drill bit 11 via a thread, and a mud generator mechanism 12 is installed inside the drill pipe 10.

[0019] Specifically, before drilling, the drill pipe 10 is connected to the power output end of the existing drilling equipment to provide a power foundation for the drill pipe 10. Then, the drill bit 11 is installed at one end of the drill pipe 10 by thread. Since the drill pipe 10 is a hollow structure, the mud is transported into the interior of the drill pipe 10 under high pressure and finally ejected through the mud outlet of the drill bit 11. This can lubricate the drill bit 11 during the drilling process. Since the mud is always transported into the interior of the drill pipe 10 under high pressure during the drilling process, when the mud passes through the mud generator mechanism 12, the mud generator mechanism 12 will convert the force generated by the impact of the mud into electricity, which can provide power to the inside of the drilling tools.

[0020] like Figures 1-3 , Figure 11 As shown, in order to solve the problem of drilling tools not getting stuck at corners during subsequent retrieval, a hole-reaming assembly 20 is provided on the outside of the drill pipe 10; The reaming assembly 20 includes a housing 21 fixedly installed outside the drill pipe 10. Three electric push rods 13 are installed inside the housing 21. One end of the electric push rod 13 passes through the housing 21 and is rotatably connected to a soil-breaking plate 22. One end of the soil-breaking plate 22 is equipped with a connector 23. When the drilling tool is retrieved, the three electric push rods 13 act on the three soil-breaking plates 22 to form an expanded shape that is smaller at the top and larger at the bottom to enlarge the hole in the well wall. The outer side of the housing 21 has three grooves 25 and three grooves 26.

[0021] The connector 23 consists of a connecting frame and a guide rod. The soil-breaking plate 22 and the guide rod are rotatably connected to the connecting frame.

[0022] Specifically, when the drilling tool gets stuck at a corner during retrieval, the electric push rod 13 is activated, causing one end of the soil-breaking plate 22 to move towards the well wall. The other end of the soil-breaking plate 22 moves downward through the connecting frame in the connector 23, acting on the guide rod, until the soil-breaking plate 22 tilts to a predetermined angle and then stops. At this point, the three soil-breaking plates 22 have reached the desired position. Figure 11 As shown, the hole can be enlarged at the corner by rotating the drill rod 10, thus preventing the drilling tool from getting stuck during retrieval.

[0023] like Figures 1-6 , Figure 9 , Figure 10 As shown, in order to solve the problem of drilling tools smoothly enlarging and rotating during the drilling process, a control component 30 is provided on the outside of the drill pipe 10; The control assembly 30 includes a second housing 31 fixedly mounted on the drill pipe 10 and a first liquid storage box 32. A fixing pipe 33 is installed inside the second housing 31. The interior of the fixing pipe 33 is divided into upper and lower layers by a storage cavity 34 housing an electric push rod 14 and a liquid storage cavity 35 in which a piston 36 is slidably mounted. One end of the electric push rod 14 is fixedly connected to the piston 36. A solenoid valve 37 is connected to the bottom of the liquid storage cavity 35, and an outlet pipe 38 and an inlet pipe 39 are installed on the solenoid valve 37. The control assembly 30 also includes a second liquid storage box 310 installed inside the first housing 21. The interior of the second liquid storage box 310 is evenly divided into three hydraulic chambers by three arc-shaped partitions 311, and a guide pipe 312 is provided on the arc-shaped partitions 311. A second piston 313 is slidably mounted inside the hydraulic chambers. The top of the second piston 313 is connected to the liquid storage box 310. Two springs 314 are installed between the inner top surfaces of the reservoir 310 and piston 313. Connector 23 is fixedly connected through reservoir 310 and piston 313. Three sealing gaskets 24 are installed on reservoir 310. One end of outlet pipe 38 is inserted through the top of reservoir 32. One end of inlet pipe 39 is inserted through the outer side of drill rod 10. The lower outlet of three guide pipes 312 is matched with the position of three hydraulic chambers. The upper end of guide pipe 312 is inserted through reservoir 310 and outer shell 21 and connected to the bottom of reservoir 32. Three electric push rods 315 are installed inside outer shell 31. The output end of electric push rod 315 is fixedly connected to sealing plate 316 through the top of reservoir 32. The three sealing plates 316 control the opening and closing of the upper inlet of the three guide pipes 312 under the action of electric push rod 315.

[0024] Specifically, when the wellbore needs to be enlarged during drilling, in the initial state, the electric push rod 14 is activated to move the piston 36 downward. Since the reservoir 35, reservoir box 32, and the corresponding spaces inside the three hydraulic chambers are all filled with mud in the initial state, the downward movement of the piston 36 will cause the mud level inside the reservoir 35 to drop. This allows the liquid inside the reservoir 35 to enter the reservoir box 32 through the outlet pipe 38. The mud inside the reservoir box 32 will then enter the three hydraulic chambers through the guide pipe 312, causing the mud level inside the three hydraulic chambers to rise. This rise in mud level in the hydraulic chambers acts on the piston 313, causing the corresponding guide rod to move upward synchronously. The guide rod, through the connecting frame, acts on one end of the ground-breaking plate 22, causing it to tilt outward toward the wellbore until the ground-breaking plate 22 tilts to the predetermined position and stops. At this point, the three ground-breaking plates 22 reach the desired position. Figure 9 In the indicated state, the well wall can be rotated to enlarge the hole. Conversely, when the electric push rod 14 acts on the piston 36 to move upward, the mud inside the hydraulic chamber will move downward again under the action of suction and spring 314, and finally the soil breaking plate 22 will return to the initial state.

[0025] Furthermore, when the drilling tools need to be rotated and guided during the drilling process, in the initial state, two of the electric push rods 315 are activated. The sealing plate 316, under the action of the electric push rods 315, seals the upper inlet of the corresponding fluid guide pipe 312, preventing mud from entering the two hydraulic chambers from the sealed fluid guide pipes 312. Then, the electric push rod 14 is activated, causing the piston 36 to move downwards, while the mud level in the corresponding other hydraulic chamber rises. The piston 313, along with the guide rod, moves upwards synchronously. The guide rod, through the connecting frame, acts on one of the soil-breaking plates 22, pressing it against the well wall. At this point, all three soil-breaking plates 22 reach the desired position. Figure 10 As shown, the soil-breaking plate 22 applies pressure to the well wall, and the well wall applies a reverse force to the soil-breaking plate 22. The reverse force is used to change the drilling direction of the drilling tool, which can eventually enable the drilling tool to perform rotational guidance work.

[0026] In the above-mentioned operation of enlarging the hole at the corner after the drilling tool is retrieved, before the guide rod moves down, the electric push rod 214 needs to be activated to move the piston 36 up. Under the action of suction and spring 314, the mud level in the three hydraulic chambers moves down, providing space for the subsequent downward movement of the guide rod. The sealing gasket 24 can clean the debris on the guide rod and improve the sealing performance.

[0027] The arrangement of three arc-shaped baffles 311 makes the interior of the liquid storage box 310 evenly divided into three hydraulic chambers. By cooperating with the liquid guide pipe 312, the electric push rod 315, and the sealing plate 316, the mud liquid level in the three hydraulic chambers can be kept at the same level as needed, so that the three soil breaking plates 22 can work synchronously. Alternatively, two of the hydraulic chambers can be kept inactive, and only one soil breaking plate 22 can be controlled by the other hydraulic chamber.

[0028] like Figure 4 , Figure 5 , Figure 8 As shown, in order to solve the problem of the drill bit 11 shaking during drilling and retrieval, a buffer assembly 40 is provided at one end of the electric push rod 13; The buffer assembly 40 includes a fixed plate 41 fixedly installed on one end of the electric push rod 13. A damper 42 is fixedly installed on the fixed plate 41. A caster wheel 43 is rotatably installed on one end of the damper 42. A spring 44 is provided between the fixed plate 41 and one end of the damper 42. The fixed plate 41 and the groove 26 on the outer shell 21 are adaptively matched.

[0029] Specifically, in the initial state, under the action of damper 42 and spring 44, the universal wheel 43 protrudes significantly from the drill bit 11. This allows the universal wheel 43 to remain in close contact with the well wall when the drill bit 11 is drilling or rotating. The damper 42 and spring 44 will buffer the force on the side of the drill bit 11 to ensure the accuracy of the drill bit 11. When the drilling tool is drilling or rotating, the working area of ​​the universal wheel 43 is significantly ahead of the working area of ​​the ground-breaking plate 22. Even when the drilling tool needs to enlarge the hole, the well wall expanded by the ground-breaking plate 22 will not affect the operation of the universal wheel 43.

[0030] Furthermore, when the aforementioned drilling tool is retrieved, the soil-breaking plate 22 moves towards the well wall under the action of the electric push rod 13, and the fixing plate 41 moves synchronously until the soil-breaking plate 22 tilts to a predetermined angle and then stops. At this time, the caster wheel 43 and the soil-breaking plate 22 reach the desired position. Figure 11 As shown, the caster wheel 43 is close to the well wall and protrudes significantly, preventing the drill bit 11 from directly contacting the well wall. The caster wheel 43 makes the retrieval of drilling tools smoother.

[0031] Working principle: The initial state of each component inside the drilling tool can be referenced. Figure 1 , Figure 3 , Figure 4 In the initial state, piston 36 is located in a predetermined position inside the liquid storage chamber 35, and the space between the bottom surface of piston 36 and the inner bottom surface of the liquid storage chamber 35 is filled with mud. The inside of the liquid storage box 32 is also filled with mud. The three pistons 313 are located on the same horizontal line, and the space between the bottom surface of piston 313 and the bottom surface of the hydraulic chamber is also filled with mud. The solenoid valve 37 operates on the outlet pipe 38. In the initial state, the mud inside the liquid storage chamber 35 and the liquid storage box 32 is transported through the outlet pipe 38, and the sealing plate 316 does not seal the upper inlet of the guide pipe 312.

[0032] In addition, the solenoid valve 37 can control the operation of the inlet pipe 39, and under the action of the electric push rod 14 and the piston 36, discharge the mud inside the storage chamber 35 to the inner wall of the drill pipe 10. Conversely, it can also draw the mud inside the drill pipe 10 into the storage chamber 35 for replacement.

[0033] When the drilling tool needs to be rotated and guided: In the initial state, two of the electric push rods 315 are activated. The sealing plate 316, under the action of the electric push rods 315, seals the upper inlet of the corresponding fluid guide pipe 312, preventing mud from entering the two hydraulic chambers from the sealed fluid guide pipes 312. Then, the electric push rod 14 is activated, causing piston 36 to move downwards, while the mud level in the corresponding other hydraulic chamber rises. Piston 313 moves upwards synchronously with the guide rod. The guide rod, through the connecting frame, acts on one of the soil-breaking plates 22, pressing it against the well wall. At this time, all three soil-breaking plates 22 reach the desired position. Figure 10 As shown, the soil-breaking plate 22 applies pressure to the well wall, and the well wall applies a reverse force to the soil-breaking plate 22. The reverse force is used to change the drilling direction of the drilling tool, which can eventually enable the drilling tool to perform rotational guidance work.

[0034] When drilling tools need to enlarge the wellbore during drilling: In the initial state, the electric push rod 14 is activated, causing piston 36 to move downwards. Since the reservoir 35, reservoir box 32, and the corresponding spaces inside the three hydraulic chambers are all filled with mud in the initial state, the downward movement of piston 36 will lower the mud level inside reservoir 35. This allows the liquid inside reservoir 35 to enter reservoir box 32 through outlet pipe 38. The mud inside reservoir box 32 will then enter the three hydraulic chambers through guide pipe 312, causing the mud level inside the three hydraulic chambers to rise. This rise in mud level inside the hydraulic chambers acts on piston 313, causing the corresponding guide rod to move upwards synchronously. The guide rod, through the connecting frame, acts on one end of the ground-breaking plate 22, causing it to tilt outwards towards the wellbore until the ground-breaking plate 22 tilts to the predetermined position and stops. At this point, the three ground-breaking plates 22 have reached the desired position. Figure 9 In the indicated state, the well wall can be rotated to enlarge the hole. Conversely, when the electric push rod 14 acts on the piston 36 to move upward, the mud inside the hydraulic chamber will move downward again under the action of suction and spring 314, and finally the soil breaking plate 22 will return to the initial state.

[0035] When the drilling tool encounters a corner requiring enlargement during retrieval: The electric push rod 14 is activated, causing piston 36 to move upwards. Under the action of suction and spring 314, the mud level in the three hydraulic chambers drops, providing space for the subsequent downward movement of the guide rod. The electric push rod 13 is then activated, moving one end of the soil-breaking plate 22 towards the well wall. The other end of the soil-breaking plate 22 moves downwards via the connecting frame, acting on the guide rod, until the soil-breaking plate 22 tilts to a predetermined angle and stops. At this point, the three soil-breaking plates 22 have reached the desired position. Figure 11 As shown, the hole can be enlarged at the corner by rotating the drill rod 10, thus preventing the drilling tool from getting stuck during retrieval.

[0036] Furthermore, the fixed plate 41 will move synchronously with one end of the electric push rod 13 until the soil-breaking plate 22 tilts to a predetermined angle and then stops. At this time, the caster wheel 43 and the soil-breaking plate 22 reach the desired position. Figure 11 As shown, the caster wheel 43 is close to the well wall and protrudes significantly, preventing the drill bit 11 from directly contacting the well wall. The caster wheel 43 makes the retrieval of drilling tools smoother.

[0037] In the above, the power supply for electric push rod 13, electric push rod 2 14, electric push rod 3 315 and solenoid valve 37 is supplied by the power generated by the mud slurry in conjunction with the mud generator mechanism 12.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A continuous circulation drilling tool, comprising a drill rod (10) installed at the power output end of a drilling equipment, one end of the drill rod (10) being threadedly connected to a drill bit (11), and a mud generator mechanism (12) being installed inside the drill rod (10), characterized in that: The drill rod (10) is provided with a hole-reaming assembly (20) on its exterior. The hole enlargement assembly (20) includes a housing (21) fixedly installed outside the drill rod (10). Three electric push rods (13) are installed inside the housing (21). One end of the electric push rod (13) passes through the housing (21) and is rotatably connected to a soil-breaking plate (22). One end of the soil-breaking plate (22) is equipped with a connector (23). The three electric push rods (13) act on the three soil-breaking plates (22) to form an expanded shape with a smaller top and a larger bottom when the drilling tool is retrieved, thus enlarging the hole in the well wall. The drill rod (10) is provided with a control component (30). The control component (30) includes a second outer shell (31) and a first liquid storage box (32) fixedly installed on the drill rod (10). A fixed tube (33) is installed on the inner side of the second outer shell (31). The inside of the fixed tube (33) is divided into two layers: a storage cavity (34) with an electric push rod (14) installed and a liquid storage cavity (35) with a piston (36) slidably installed inside. One end of the electric push rod (14) is fixedly connected to the piston (36). A solenoid valve (37) is connected to the bottom of the liquid storage cavity (35). An outlet pipe (38) and an inlet pipe (39) are installed on the solenoid valve (37). The control component (30) also includes a liquid storage box (310) installed inside the outer casing (21). The interior of the liquid storage box (310) is evenly divided into three hydraulic chambers by three arc-shaped partitions (311), and a liquid guide pipe (312) is provided on the arc-shaped partitions (311). A piston (313) is slidably arranged inside the hydraulic chamber. Two springs (314) are provided between the top of the piston (313) and the inner top surface of the liquid storage box (310). The connector (23) is fixedly connected through the second liquid storage box (310) and the second piston (313), and three sealing gaskets (24) are provided on the second liquid storage box (310). The top of the first liquid storage box (32) is penetrated by one end of the liquid outlet pipe (38), and the outer side of the drill rod (10) is fixedly connected by one end of the liquid inlet pipe (39). The inner side of the outer shell 2 (31) is provided with three electric push rods 3 (315), and the output end of the electric push rods 3 (315) passes through the top of the liquid storage box 1 (32) and is fixedly connected to a sealing plate (316). Under the action of the electric push rods 3 (315), the three sealing plates (316) control the opening and closing of the upper inlet of the three liquid guide tubes (312). One end of the electric push rod (13) is provided with a buffer assembly (40). The buffer assembly (40) includes a fixed plate (41) fixedly installed on one end of the electric push rod (13). A damper (42) is fixedly installed on the fixed plate (41). A caster wheel (43) is rotatably installed on one end of the damper (42). A spring (44) is provided between the fixed plate (41) and one end of the damper (42). The fixed plate (41) and the groove (26) on the outer shell (21) are adaptively matched.

2. The continuous circulation drilling tool according to claim 1, characterized in that, The outer shell 1 (21) has three grooves 1 (25) and three grooves 2 (26) on its exterior.

3. A continuous circulation drilling tool according to claim 2, characterized in that, The lower outlets of the three liquid guide tubes (312) are matched with the positions of the three hydraulic chambers. The upper ends of the liquid guide tubes (312) pass through the second liquid storage box (310) and the first outer shell (21) in sequence and are connected to the bottom of the first liquid storage box (32).

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