Overload protection drill bit tool with automatic mud drum cleaning function

Abstract

The invention discloses an overload protection drill bit tool with an automatic mud drum cleaning function. The overload protection drill bit tool comprises a connector pipeline, a fluid pipeline, a bearing component, a sealing device, a cleaning pressure relief device, a pressure relief pipeline and a drill bit connector. A fluid pipeline is arranged at the bottom of the connector pipeline, the pressure relief pipeline is arranged at the bottom of the fluid pipeline, and the drill bit connector is arranged at the bottom of the pressure relief pipeline. One of the two bearing parts is arranged at the bottom of the fluid pipeline, and the other bearing part is mounted at the upper end of the drill bit connector; the number of the sealing devices is two, and the two sealing devices are arranged on the opposite sides of the two bearing components. The cleaning pressure relief device is arranged between the two sealing devices, and the two bearing components are symmetrically arranged relative to the cleaning pressure relief device. The cleaning pressure relief device can be automatically opened and closed after the drill bit is blocked by a balling drum, the drill bit balling drum is cleaned, automatic rotation can be achieved, and it is guaranteed that cleaning is comprehensive and thorough.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling and geological exploration, in particular to an overload protection drill bit tool with automatic mud bag cleaning function. Background Art

[0002] In oil and gas drilling operations, the downhole environment is complex. Due to factors such as uneven geological structures, frequently changing rock layers, and formation fractures, mud balling problems frequently occur during drilling. Rock cuttings, clay and other materials in the drilling fluid continue to accumulate on the surface of the drill bit, forming mud balls, which seriously affect the drilling efficiency of the drill bit. Mud balls not only increase the rotational resistance of the drill bit, causing the torque to further increase, but also hinder the normal circulation of the drilling fluid and reduce the cooling and chip removal effects.

[0003] Existing downhole tools generally lack the functions of automatic cleaning of mud balls and overload protection. When the drill bit is covered with mud balls, the drilling fluid cannot flow out, and the pressure inside the drill bit will increase, which can easily lead to damage to the drill bit. Therefore, manual regular cleaning or additional complex measures are required, which not only increases costs, but may also affect the continuity and safety of drilling operations due to untimely cleaning. Therefore, the development of a drill bit tool that has both automatic cleaning of mud balls and torque reduction and overload protection is of vital importance to improving the efficiency of oil and gas drilling operations.

[0004] Based on this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an overload protection drill tool with automatic mud ball cleaning function to solve the above problems. To achieve the above purpose, the technical solution adopted by the present invention is: an overload protection drill tool with automatic mud ball cleaning function, comprising: a joint pipe, a fluid pipe, a bearing component, a sealing device, a cleaning pressure relief device, a pressure relief pipe and a drill joint;

[0006] A fluid pipeline is provided at the bottom of the joint pipeline, the pressure relief pipeline is provided at the bottom of the fluid pipeline, and the drill joint is provided at the bottom of the pressure relief pipeline; there are two bearing components, one of which is provided at the bottom of the fluid pipeline, and the other is installed at the upper end of the drill joint; there are two sealing devices, and the two sealing devices are provided at opposite sides of the two bearing components; the cleaning pressure relief device is provided between the two sealing devices, and the two bearing components are symmetrically provided relative to the cleaning pressure relief device;

[0007] The cleaning pressure relief device comprises a housing, a pressure relief switch, a pressure relief groove, a connection port, and a nozzle;

[0008] The upper and lower ends of the shell are fixedly connected to the two sealing devices respectively; there are a plurality of pressure relief switches, which are installed in the shell, and the plurality of pressure relief switches are respectively arranged around the pressure relief pipe at equal intervals along the circumferential direction; there are a plurality of pressure relief grooves, which are respectively located in the same chamber space as the plurality of pressure relief switches; there are a plurality of nozzles which are respectively installed on the lower surface of the shell at equal intervals along the circumferential direction, and the nozzles are connected with the pressure relief grooves through the connecting port.

[0009] Preferably, the bearing component comprises a bearing groove, a retaining frame, a ball, and a supporting rivet;

[0010] The retaining frame is installed on the bearing groove; there are a plurality of spheres, and the plurality of spheres are equidistantly arranged between the retaining frame and the bearing groove along the circumferential direction; there are a plurality of supporting rivets, and the plurality of supporting rivets are equidistantly arranged along the circumferential direction and staggered with the plurality of spheres, and the plurality of supporting rivets pass through the retaining frame respectively.

[0011] Preferably, there are six balls and six supporting rivets.

[0012] Preferably, the sealing device comprises a fixing groove and a sealing bearing;

[0013] The fixing groove is fixedly connected to the end of the cleaning pressure relief device; the sealing bearing is rotatably mounted on the fixing groove, and the sealing bearing surrounds the pressure relief pipe and is in close contact with the outer wall of the pressure relief pipe.

[0014] Preferably, there are six pressure relief switches, pressure relief grooves and nozzles.

[0015] Preferably, the pressure relief switch includes an outlet slot, a spring, a rubber pad, and an iron sheet;

[0016] There are several outlet slots, which are respectively installed in the shell; the rubber pad is installed on the outlet slot; the spring is installed between the rubber pad and the outlet slot; and the iron sheet is installed on the side of the rubber pad away from the outlet slot.

[0017] Preferably, there are six outlet slots, six rubber pads, and six iron sheets;

[0018] There are twelve springs, and the six outlet slots in each pressure relief switch are connected to the rubber pad through two springs symmetrically arranged with each other.

[0019] Preferably, it further comprises a supporting washer, wherein the supporting washer is arranged between the sealing device located below and the drill bit joint.

[0020] Preferably, it also includes a drill bit; the inner wall of the drill bit joint is provided with threads, and the drill bit is threadedly connected to the drill bit joint.

[0021] Preferably, the nozzle is arranged to be inclined from top to bottom, and the end of the nozzle away from the housing corresponds to the position of the drill bit.

[0022] Beneficial effects of the present invention

[0023] 1. When the drill bit is blocked by mud bags and the water hole causes the internal pressure of the drill bit to increase, the present invention can automatically start the function of the cleaning pressure relief device, and automatically flush the drill bit by changing the flow direction of the drilling fluid. At the same time, it can relieve the internal pressure and perform overload protection. After the mud bags blocking the drill bit are cleaned, the cleaning pressure relief device is automatically closed and the water output of the drill bit is restored. This process does not affect normal drilling, and at the same time ensures the normal operation of the equipment without manual cleaning of the drill bit.

[0024] 2. In the present invention, when the drill bit is blocked and the drilling fluid pressure increases, the rubber pad can be automatically pushed open and the spring can be stretched, so that the high-pressure drilling fluid is automatically ejected to clean the drill bit. When the pressure is reduced, the rubber pad can be automatically reset by the tension of the spring, closing the passage and allowing the drilling fluid to flow out of the drill bit again. This operation does not require manual control and can be automatically controlled according to the drilling fluid pressure, which is easy to use.

[0025] 3. The inclined nozzle of the present invention can make the cleaning water flow have an inclined angle when acting on the drill bit surface, so that under the action of the pressurized water flow, the reverse thrust is used to rotate the cleaning pressure relief device, thereby comprehensively cleaning the drill bit surface; when the drill bit is cleaned and the cleaning pressure relief device is closed, the cleaning pressure relief device can automatically stop rotating, and the structure is reasonable and does not require manual control.

[0026] 4. The present invention fundamentally prevents the drill bit water hole from being blocked by mud bags, which causes the drill bit to be overloaded, thereby improving the operating efficiency and reducing the drilling cost.

[0027] In summary, the present invention can automatically change the flow direction of the drilling fluid after the drill bit is blocked by mud bags, and automatically open and close the cleaning pressure relief device according to the internal drilling fluid pressure, and use the drilling fluid to automatically clean the drill bit mud bags, and can automatically rotate the cleaning pressure relief device to ensure comprehensive and thorough cleaning, with a simple and reasonable structure and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a front view of the entire embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0031] Figure 3 Schematic diagram of the top view of the structure of an embodiment of the present invention.

[0032] Figure 4 It is a schematic diagram of the main structure of the present invention in an embodiment.

[0033] Figure 5 It is a front view of the bearing component described in an embodiment of the present invention.

[0034] Figure 6 Schematic diagram of the structure of the bearing component in an embodiment of the present invention.

[0035] Figure 7 It is a front view of the sealing device described in the embodiment of the present invention.

[0036] Figure 8 It is a structural cross-sectional view of the sealing device described in an embodiment of the present invention.

[0037] Fig. 9 It is a structural cross-sectional view of the cleaning pressure relief device described in an embodiment of the present invention.

[0038] Fig.10 It is a schematic diagram of the top view of the cleaning pressure relief device in an embodiment of the present invention.

[0039] Fig.11 This is a front view of the pressure relief switch in the embodiment of the present invention.

[0040] Fig.12 Schematic diagram of the top view of the pressure relief switch in an embodiment of the present invention.

[0041] Reference Numbers

[0042] 1: Joint pipe;

[0043] 2: Fluid pipeline;

[0044] 3: bearing components; 3-1: bearing groove; 3-2: cage; 3-3: ball; 3-4: support rivet;

[0045] 4: Sealing device; 4-1: Fixed groove; 4-2: Sealed bearing;

[0046] 5: Cleaning pressure relief device; 5-a: Shell; 5-1: Pressure relief switch; 5-1-1: Outlet slot; 5-1-2: Spring; 5-1-3: Rubber pad; 5-1-4: Iron sheet; 5-2: Pressure relief slot; 5-3: Connection port; 5-4: Nozzle;

[0047] 6: Pressure relief pipeline; 6-1: Pressure relief port;

[0048] 7: Support washer;

[0049] 8: Drill bit joint;

[0050] 9: Drill bit. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "linked to" another element, it can be directly linked to the other element or indirectly linked to the other element.

[0053] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In one embodiment, if Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the present invention provides an overload protection drill tool with automatic mud bag cleaning function, including: a joint pipe 1, a fluid pipe 2, a bearing component 3, a sealing device 4, a cleaning pressure relief device 5, a pressure relief pipe 6, a support washer 7, a drill joint 8 and a drill bit 9. The upper end of the joint pipe 1 is provided with an opening, and the side of the joint pipe 1 is provided with a thread. The joint pipe 1 is used to connect the drilling tool of the drilling equipment. Through the threaded connection, it can ensure that the joint pipe 1 and the drilling equipment are tightly connected to prevent problems such as loosening or leakage during the drilling process. The bottom of the joint pipe 1 is provided with a fluid pipe 2. The pressure relief pipe 6 is arranged at the bottom of the fluid pipe 2. The drill joint 8 is arranged at the bottom of the pressure relief pipe 6. The outer diameter of the pressure relief pipe 6 is smaller than the outer diameter of the fluid pipe 2 and the drill joint 8, and the three are coaxially arranged. The vertical cross-sectional view of the fluid pipe 2, the pressure relief pipe 6 and the drill joint 8 is a dumbbell-shaped, i.e., an I-shaped arrangement. The drill bit 9 is installed at the bottom end of the drill bit joint 8. The inner wall of the drill bit joint 8 is provided with a thread. The drill bit 9 is provided with a thread adapted to the inner wall thread of the drill bit joint 8, so that the drill bit 9 is fixedly connected to the drill bit joint 8 by a threaded connection. The fluid pipeline 2, the pressure relief pipeline 6 and the drill bit joint 8 constitute a conveying channel for drilling fluid. The outer wall of the drill bit 9 is provided with a plurality of water holes. The drilling fluid conveyed through the conveying channel for drilling fluid can flow out through the water holes of the drill bit 9. There are two bearing components 3, one of which is arranged at the bottom of the fluid pipeline 2 and the other is installed at the upper end of the drill bit joint 8. There are two sealing devices 4, and the two sealing devices 4 are arranged on opposite sides of the two bearing components 3. The cleaning pressure relief device 5 is arranged between the two sealing devices 4, and the two bearing components 3 are symmetrically arranged relative to the cleaning pressure relief device 5. The two sealing devices 4 are used to seal the internal space of the cleaning pressure relief device 5, so that the space between the cleaning pressure relief device 5 and the pressure relief pipeline 6 is relatively independent, and does not affect the rotation of the cleaning pressure relief device 5 relative to the pressure relief pipeline 6. The pressure relief pipe 6 passes through the bearing component 3, the sealing device 4 and the cleaning pressure relief device 5, and the bearing component 3, the sealing device 4, the cleaning pressure relief device 5 and the pressure relief pipe 6 are coaxially arranged. When the water hole passage of the drill bit 9 is blocked and the drilling fluid pressure in the conveying channel of the drilling fluid increases, the drilling fluid can be ejected through the cleaning pressure relief device 5, thereby cleaning the water hole of the drill bit 9 and releasing the internal pressure of the drill bit 9 and the cleaning pressure relief device 5, and playing the role of overload protection.

[0056] like Figure 5 and Figure 6As shown, the bearing component 3 includes a bearing groove 3-1, a retainer 3-2, a ball 3-3, and a support rivet 3-4. The bearing groove 3-1 is connected to the fluid pipeline 2 or the drill joint 8. The retainer 3-2 is installed on the bearing groove 3-1. There are six balls 3-3, and the six balls 3-3 are equidistantly arranged between the retainer 3-2 and the bearing groove 3-1 along the circumferential direction. The support of the balls 3-3 is used to prevent the retainer 3-2 from contacting the bearing groove 3-1. Among them, an annular blind groove is provided on the side corresponding to the bearing groove 3-1 and the ball 3-3. The six balls 3-3 are installed in the blind groove to ensure that the balls 3-3 can roll circumferentially in the blind groove, and the balls 3-3 are limited to prevent the balls 3-3 from leaving the circumferential rolling track. The retainer 3-2 is provided with six arc-shaped arms. After the retainer 3-2 is installed, the six arc-shaped arms are engaged with the six spheres 3-3, thereby realizing the connection between the spheres 3-3, the bearing slots 3-1 and the retainer 3-2. At the same time, since the spheres 3-3 are evenly distributed in the circumferential direction, the force of the retainer 3-2 can be guaranteed to be stable. In addition, the contact surface between the arc-shaped arms and the spheres 3-3 is polished and smooth, ensuring that when the retainer 3-2 and the bearing slots 3-1 rotate relative to each other, the spheres 3-3 can roll smoothly. Then, the fixation of the spheres 3-3 is realized by limiting the position of the retainer 3-2. There are six support rivets 3-4, which are equidistantly arranged in the circumferential direction and staggered with the six spheres 3-3 to avoid interference. The six support rivets 3-4 pass through the retainer 3-2 respectively to fix the retainer 3-2 on the surface of the cleaning pressure relief device 5.

[0057] It can be understood that, in this embodiment, of the two bearing components 3, the upper bearing component 3 is installed at the bottom of the fluid pipeline 2, and the supporting rivets 3-4 therein are fixed to the upper surface of the cleaning pressure relief device 5. The lower bearing component 3 is installed at the upper end of the drill bit joint 8, and the supporting rivets 3-4 therein are fixed to the lower surface of the sealing bearing 4-2 in the sealing device 4 located below. This ensures that the cleaning pressure relief device 5 can rotate independently relative to the fluid pipeline 2, the pressure relief pipeline 6 and the drill bit joint 8 to form a transportation channel for drilling fluid. Since there is a gap between the cleaning pressure relief device 5 and the pressure relief pipeline 6, when the cleaning pressure relief device 5 is working and rotating, it has instability in the horizontal direction, and the bearing component 3 can provide a limit to ensure the stability of the cleaning pressure relief device 5 in the horizontal direction. At the same time, the bearing component 3 can also assist the cleaning pressure relief device 5 in rotating.

[0058] like Figure 7 , Figure 8As shown, the sealing device 4 includes a fixed groove 4-1 and a sealing bearing 4-2. The fixed groove 4-1 is fixedly connected to the end of the cleaning pressure relief device 5, and the sealing bearing 4-2 is rotatably mounted on the fixed groove 4-1, which can ensure that the cleaning pressure relief device 5 rotates along the track of the sealing bearing 4-2. The sealing bearing 4-2 surrounds the outer wall of the pressure relief pipe 6 and is in close contact with the outer wall of the pressure relief pipe 6, thereby playing a sealing role.

[0059] It can be understood that in this embodiment, since there is a gap between the clean pressure relief device 5 and the pressure relief pipe 6, the sealing bearing 4-2 in the two sealing devices 4 is tightly connected to the pressure relief pipe 6, and the formed sealing barrier prevents the drilling fluid from overflowing. At the same time, there is a gap between the clean pressure relief device 5 and the pressure relief pipe 6, and the two are not in direct contact to prevent the friction resistance between the clean pressure relief device 5 and the pressure relief pipe 6 when the clean pressure relief device 5 rotates. Secondly, the outer wall of the pressure relief pipe 6 is provided with a plurality of pressure relief ports 6-1, and when the pressure of the pressure relief pipe 6 increases, the drilling fluid can enter the clean pressure relief device 5 through the pressure relief port 6-1.

[0060] like Fig. 9 , Fig.10 , Fig.11 As shown, the cleaning pressure relief device 5 includes a shell 5-a, a pressure relief switch 5-1, a pressure relief groove 5-2, a connection port 5-3, and a nozzle 5-4. The shell 5-a is the main support structure of the cleaning pressure relief device 5, which is a cylindrical hollow structure for connecting with the sealing device 4, specifically, the upper and lower ends of the shell 5-a are respectively fixedly connected with the fixing grooves 4-1 in the two sealing devices 4. There are six pressure relief switches 5-1, and the six pressure relief switches 5-1 are installed in the shell 5-a, and the six pressure relief switches 5-1 are respectively arranged around the pressure relief pipe 6 at equal distances along the circumferential direction; the inner cavity of the pressure relief groove 5-2 is a cubic space, and there are six of them. The six pressure relief grooves 5-2 are respectively located in the same chamber space with the six pressure relief switches 5-1, and the positions correspond to each other. The nozzle 5-4 is arranged at the bottom of the cleaning pressure relief device 5. There are six nozzles 5-4, which are respectively installed on the lower surface of the shell 5-a at equal distances along the circumferential direction, and the nozzle 5-4 is connected with the pressure relief groove 5-2 through the connection port 5-3. The end of the nozzle 5-4 away from the housing 5-a corresponds to the position of the drill bit 9, and the nozzle 5-4 is tilted from top to bottom. Fig.10 , one end of each nozzle 5-4 away from the housing 5-a is inclined in the clockwise direction.

[0061] It can be understood that when the internal pressure of the cleaning pressure relief device 5 reaches a set threshold, the pressure relief switch 5-1 is turned on, the drilling fluid enters the pressure relief groove 5-2 in the cubic space, and then is sprayed out through the nozzle 5-4.

[0062] like Fig.11 As shown ( Fig.11: The front view of the pressure relief switch 5-1), the pressure relief switch 5-1 includes an outlet slot 5-1-1, a spring 5-1-2, a rubber pad 5-1-3, and an iron sheet 5-1-4. There are six outlet slots 5-1-1, which are installed in the housing 5-a. One end of the outlet slot 5-1-1 corresponds to the pressure relief pipe 6, and the other end corresponds to the inner cavity of the pressure relief slot 5-2. The rubber pad 5-1-3 is installed at the end of the outlet slot 5-1-1 away from the pressure relief pipe 6. When the rubber pad 5-1-3 contacts the outlet slot 5-1-1, the passage can be closed. The spring 5-1-2 is installed between the rubber pad 5-1-3 and the outlet slot 5-1-1. In this embodiment, each pressure relief switch 5-1 includes twelve springs 5-1-2, and the six outlet slots 5-1-1 in each pressure relief switch 5-1 are connected to the corresponding rubber pads 5-1-3 through two symmetrically arranged springs 5-1-2, and one end of the two springs 5-1-2 is fixedly connected to the two sides of the outer wall of the outlet slot 5-1-1, and the other ends of the two springs 5-1-2 are connected to the two ends of the rubber pads 5-1-3, which can ensure that the outlet slot 5-1-1 and the rubber pads 5-1-3 can be stably connected to each other, and the springs 5-1-2 will not block the passage outlet of the outlet slot 5-1-1. The iron sheet 5-1-4 is installed on the side of the rubber pad 5-1-3 away from the outlet slot 5-1-1.

[0063] It should be understood that when the pressure between the pressure relief pipe 6 and the cleaning pressure relief device 5 reaches a threshold value, the spring 5-1-2 will begin to stretch under the action of the pressure, and the rubber pad 5-1-3 will not fit tightly against the outlet groove 5-1-1, and the drilling fluid will enter the pressure relief groove 5-2 through the outlet groove 5-1-1, so that the drilling fluid will be ejected from the nozzle 5-4 through the connecting port 5-3, and the ejected drilling fluid has a strong impact, thereby cleaning the mud bag on the water eye of the drill bit 9. At the same time, since the nozzle 5-4 is tilted, the backflow will be ejected at the same angle as the tilt direction of the nozzle 5-4, and the drilling fluid will impact the surface of the drill bit 9 to generate a lateral component force. According to Newton's third law, a reaction force opposite to the impact direction will be generated. With the help of this reaction force, the cleaning pressure relief device 5 can be rotated as a whole, thereby ensuring that the drilling fluid can fully flush the drill bit 9. When the internal pressure drops to within the threshold, the spring 5-1-2 will shrink under its own tension, so that the rubber pad 5-1-3 continues to fit the outlet groove 5-1-1. At this time, the pressure relief switch 5-1 is closed and the cleaning pressure relief device 5 stops rotating.

[0064] The specific use steps of this embodiment are as follows: During normal operation, the cleaning pressure relief switch is set to the closed state, the nozzle 5-4 will not spray fluid, and the cleaning pressure relief device 5 is in a static state. When the water hole of the drill bit 9 is blocked by mud bags, the drilling fluid applied from the ground cannot flow out normally from the water hole position, resulting in an increase in the accumulation pressure of the drilling fluid. At this time, the drilling fluid will flow back from the drill bit 9 to the pressure relief pipeline 6 and enter the cleaning pressure relief device 5 through the pressure relief port 6-1. When the pressure increases to the threshold, the pressure relief switch 5-1 will be turned on, and the drilling fluid will enter the pressure relief groove 5-2. While the pressure continues to increase, the drilling fluid will enter the nozzle 5-4 through the connecting port 5-3, thereby spraying out the drilling fluid. The sprayed drilling fluid has impact under the action of high pressure. On the one hand, it can clean the mud bags of the water hole of the drill bit 9, and on the other hand, it can also remove the internal pressure of the drill bit 9 and the cleaning pressure relief device 5. In this process, the shell 5-a and the nozzle 5-4 are in a rotating state as a whole, which can evenly clean the drill bit 9. When the mud pack of the water hole of the drill bit 9 is cleaned by the drilling fluid, the drilling fluid can flow out of the water hole normally, and the pressure inside the drill bit 9 and the cleaning pressure relief device 5 will also decrease. When it decreases to a set threshold, the cleaning pressure relief switch will be closed, and the drill bit 9 will start to work normally. The present invention realizes the intelligent design of the automatic cleaning and pressure relief mechanism, and provides effective protection and continuity for the drilling operation.

[0065] In addition, the drill bit tool with automatic mud bag cleaning function and overload protection also includes a support washer 7, which is arranged between the sealing device 4 and the drill bit joint 8 located below. Figure 1 , Figure 2 , Figure 4 As shown, the upper and lower ends of the support washer 7 are connected to the bottom of the sealed bearing 4-2 and the top of the drill joint 8 respectively. It should be understood that the support washer 7 is fixed to the upper end of the drill joint 8 to support the sealed bearing 4-2 and keep it stable in the vertical direction. Avoid the shaking of the sealed bearing 4-2 affecting the normal operation of the cleaning pressure relief device 5. At the same time, the support washer 7 can also support the cleaning pressure relief device 5.

[0066] Finally, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0067] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A drill bit tool with automatic mud bag cleaning function and anti-overload protection, characterized in that: include: A joint pipe (1), a fluid pipe (2), a bearing component (3), a sealing device (4), a cleaning pressure relief device (5), a pressure relief pipe (6) and a drill bit joint (8); A fluid pipeline (2) is provided at the bottom of the joint pipeline (1), the pressure relief pipeline (6) is provided at the bottom of the fluid pipeline (2), and the drill joint (8) is provided at the bottom of the pressure relief pipeline (6); there are two bearing components (3), one of which is provided at the bottom of the fluid pipeline (2), and the other is installed at the upper end of the drill joint (8); there are two sealing devices (4), and the two sealing devices (4) are provided at opposite sides of the two bearing components (3); the cleaning pressure relief device (5) is provided between the two sealing devices (4), and the two bearing components (3) are symmetrically provided relative to the cleaning pressure relief device (5); The cleaning pressure relief device (5) comprises a housing (5-a), a pressure relief switch (5-1), a pressure relief groove (5-2), a connecting port (5-3), and a nozzle (5-4); The upper and lower ends of the shell (5-a) are respectively fixedly connected to the two sealing devices (4); there are a plurality of pressure relief switches (5-1), which are installed in the shell (5-a), and the plurality of pressure relief switches (5-1) are respectively arranged around the pressure relief pipe (6) at equal intervals along the circumferential direction; there are a plurality of pressure relief grooves (5-2), which are respectively located in the same chamber space as the plurality of pressure relief switches (5-1); there are a plurality of nozzles (5-4) which are respectively installed on the lower surface of the shell (5-a) at equal intervals along the circumferential direction, and the nozzles (5-4) are connected to the pressure relief grooves (5-2) through the connecting port (5-3).

2. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to claim 1 is characterized in that: The bearing component (3) comprises a bearing groove (3-1), a retaining frame (3-2), a ball (3-3), and a supporting rivet (3-4); The retaining frame (3-2) is installed on the bearing groove (3-1); there are a plurality of spheres (3-3), and the plurality of spheres (3-3) are equidistantly arranged between the retaining frame (3-2) and the bearing groove (3-1) along the circumferential direction; there are a plurality of supporting rivets (3-4), and the plurality of supporting rivets (3-4) are equidistantly arranged along the circumferential direction and are staggered with the plurality of spheres (3-3), and the plurality of supporting rivets (3-4) respectively pass through the retaining frame (3-2).

3. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to claim 2 is characterized in that: There are six spheres (3-3) and six supporting rivets (3-4).

4. The drill bit tool with automatic mud ball cleaning function and overload protection according to claim 3 is characterized in that: The sealing device (4) comprises a fixing groove (4-1) and a sealing bearing (4-2); The fixed groove (4-1) is fixedly connected to the end of the cleaning pressure relief device (5); the sealing bearing (4-2) is rotatably mounted on the fixed groove (4-1), and the sealing bearing (4-2) surrounds the pressure relief pipe (6) and is in close contact with the outer wall of the pressure relief pipe (6).

5. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to any one of claims 1 to 4, characterized in that: There are six pressure relief switches (5-1), six pressure relief grooves (5-2) and six nozzles (5-4).

6. The drill bit tool with automatic mud ball cleaning function and overload protection according to claim 5, characterized in that: The pressure relief switch (5-1) comprises an outlet groove (5-1-1), a spring (5-1-2), a rubber pad (5-1-3), and an iron sheet (5-1-4); There are a plurality of outlet grooves (5-1-1), and the plurality of outlet grooves (5-1-1) are respectively installed in the housing (5-a); a rubber pad (5-1-3) is installed on the outlet groove (5-1-1); a spring (5-1-2) is installed between the rubber pad (5-1-3) and the outlet groove (5-1-1); and the iron sheet (5-1-4) is installed on a side of the rubber pad (5-1-3) away from the outlet groove (5-1-1).

7. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to claim 6, characterized in that: There are six outlet slots (5-1-1), six rubber pads (5-1-3) and six iron sheets (5-1-4); There are twelve springs (5-1-2), and the six outlet slots (5-1-1) in each pressure relief switch (5-1) are respectively connected to the rubber pad (5-1-3) via two springs (5-1-2) symmetrically arranged with each other.

8. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to claim 7, characterized in that: It also comprises a supporting washer (7), wherein the supporting washer (7) is arranged between the sealing device (4) located below and the drill bit joint (8).

9. The drill bit tool with automatic mud ball cleaning function and anti-overload protection according to claim 8, characterized in that: It also includes a drill bit (9); the inner wall of the drill bit joint (8) is provided with threads, and the drill bit (9) is threadedly connected to the drill bit joint (8).

10. The drill bit tool with automatic mud ball cleaning function and overload protection according to claim 9, characterized in that: The nozzle (5-4) is arranged to be inclined from top to bottom, and the end of the nozzle (5-4) away from the housing (5-a) corresponds to the position of the drill bit (9).

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