Anti-collision mixed drill bit

Abstract

The utility model discloses an anti-collision mixed drill bit, and relates to the technical field of petroleum, natural gas and geological drilling tools, the anti-collision mixed drill bit comprises a drill bit body, the drill bit body comprises a drill bit handle and a plurality of cutting blades, one ends of the cutting blades are mutually gathered, the other ends of the cutting blades extend outwards, and the cutting blades are located at the top end of the drill bit handle. Each cutting blade sequentially forms an inner cone part, a nose shoulder part and a gauge protection part from inside to outside, an angle is formed between every two adjacent cutting blades, and a cone assembly is arranged between every two adjacent cutting blades; the cutting assembly comprises first cutting teeth distributed on the outer surface of the inner cone part and the outer surface of the nose shoulder part, and double rows of retroverted supporting teeth distributed on the outer surface of the nose shoulder part and the outer surface of the gauge protection part; the double-row retroverted supporting teeth comprise the front-row supporting teeth located on the front face of the nose shoulder part and the front face of the gauge protection part, and the rear-row supporting teeth located on the side face of the nose shoulder part and the side face of the gauge protection part.

Description

Technical Field

[0001] The utility model relates to the technical field of oil, natural gas and geological drilling tools, and particularly relates to an anti-collision hybrid bit. Background Art

[0002] With the increasing maturity of cluster drilling and infill well technologies, especially the small well spacing dense cluster directional well technology, the problems of shallow and deep anti-collision of directional wells on cluster platforms caused by a large number of wells and small well spacing are becoming more and more prominent. At present, roller cone bits are mainly used for drilling in the anti-collision section. However, due to the low mechanical drilling speed and limited service life of roller cone bits, generally after drilling the anti-collision section, the drill string is pulled out and the bit is replaced with a PDC (Polycrystalline Diamond Compact) bit. After drilling the plug, drilling continues. This not only increases the complexity of drilling operations and reduces drilling efficiency, but also may damage the diamond composite inserts of the PDC bit during plug drilling. At the same time, the PDC bit uses fixed diamond composite inserts, and when rotating at high speed, the cutting edges of the composite inserts are very sharp. For directional wells on cluster platforms with small well spacing, the PDC bit is very likely to cut the casing between adjacent wells, causing casing damage and leaving hidden dangers for subsequent construction. Summary of the Utility Model

[0003] The present application provides an anti-collision hybrid bit, which can solve the technical problems existing in the prior art that different types of bits need to be replaced according to the drilling progress during drilling, resulting in cumbersome drilling procedures and low drilling efficiency. At the same time, for directional wells on cluster platforms with small well spacing, it is very likely to cut the casing between adjacent wells, causing hidden dangers.

[0004] An embodiment of the present application provides an anti-collision hybrid bit, including:

[0005] A bit body, the bit body includes a bit shank and a plurality of cutting wings with one end converging with each other and the other end extending outwards, and the cutting wings are located at the top of the bit shank. The cutting wings are sequentially formed with an inner cone part, a nose shoulder part and a gauge part from inside to outside. Adjacent two cutting wings form an angle with each other, and a roller cone assembly is provided between every two adjacent cutting wings;

[0006] A cutting assembly, the cutting assembly includes first cutting teeth distributed on the outer surface of the inner cone part and the outer surface of the nose shoulder part, and double-row rearward-inclined support teeth distributed on the outer surface of the nose shoulder part and the outer surface of the gauge part;

[0007] Among them, the double-row rear-inclined support teeth include front-row support teeth located on the front of the nose shoulder part and the front of the gauge protection part, and rear-row support teeth located on the back of the nose shoulder part and the back of the gauge protection part. The outer ends of the double-row rear-inclined support teeth are cylindrical, conical, spherical or arc-shaped, and the rear-inclination angle of the front-row support teeth is smaller than that of the rear-row support teeth.

[0008] In one embodiment, a threaded connection end for connecting with an external power end is provided at the bottom of the drill bit shank.

[0009] In one embodiment, a plurality of drilling fluid nozzles are provided at the top end of the drill bit shank. The drilling fluid nozzles are inclined, and the injection angle of the drilling fluid nozzles forms an angle of 5° to 50° with the central axis of the drill bit shank.

[0010] In one embodiment, the convergence points of multiple cutting blade wings are located at the center point of the top end of the drill bit shank, and the angle between any two adjacent cutting blade wings is equal.

[0011] In one embodiment, the cone assembly includes a cone palm part. The bottom of the cone palm part is integrally formed with the top end of the drill bit shank, and a cutting cone is rotatably arranged at the top of the cone palm part.

[0012] In one embodiment, second cutting teeth are arranged on the cutting cone, and the second cutting teeth are arranged along the circumference of the cone surface of the cutting cone.

[0013] In one embodiment, the rock-breaking depth of the second cutting teeth is greater than that of the first cutting teeth located on the nose shoulder part.

[0014] In one embodiment, a gauge protection assembly is provided on the outer surface of the drill bit body, and the gauge protection assembly is located below the double-row rear-inclined support teeth.

[0015] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include:

[0016] 1. For the anti-collision hybrid drill bit in the present application, by arranging a plurality of cone assemblies and the first cutting teeth arranged on the outer surface of the inner cone part and the outer surface of the nose shoulder part, two rock-breaking methods can be combined simultaneously. During drilling, there is no need to replace the drill bit again, reducing the drilling process. At the same time, in cooperation with the double-row rear-inclined support teeth, the impact force of the overall structure on the rock can be increased, not only improving the rock-breaking efficiency, but also protecting the cutting assembly and prolonging the service life of the cutting assembly;

[0017] 2. For the anti-collision hybrid drill bit in the present application, through the double-row rear-inclined support teeth on the outer surface of the nose shoulder part and the outer surface of the gauge protection part, the cutting force of the outer row of the drill bit can be weakened, reducing the damage to the casing between adjacent wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of an anti-collision hybrid bit provided by an embodiment of the present application;

[0020] Figure 2 Schematic structural diagram of the cutting blade and double-row rear-inclined support teeth in an anti-collision hybrid bit provided by an embodiment of the present application;

[0021] Figure 3 Top view of an anti-collision hybrid bit provided by an embodiment of the present application;

[0022] Figure 4 Schematic exploded view of the cutting blade structure in an anti-collision hybrid bit provided by an embodiment of the present application. In the figure: 1. Bit shank; 101. Threaded connection end; 102. Drilling fluid nozzle; 2. Roller cone assembly; 201. Roller cone section; 202. Cutting roller cone; 203. Second cutting tooth; 3. Cutting blade; 4. Inner cone section; 5. Nose shoulder; 6. Gauge section; 7. First cutting tooth; 8. Double-row rear-inclined support teeth; 801. Front row support teeth; 802. Rear row support teeth; 9. Gauge assembly. Detailed implementation manners

[0023] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0024] The embodiment of the present application provides an anti-collision hybrid bit, which can solve the technical problems in the prior art that when drilling a directional well on a cluster platform, different bits need to be replaced according to the drilling depth, resulting in cumbersome drilling work and low drilling efficiency. Moreover, for small-spacing dense cluster directional wells, there are many wells and small well spacing, and ordinary PDC bits are prone to damage the casing between adjacent wells.

[0025] The anti-collision hybrid bit provided by the present application includes a bit body and a cutting assembly. The cutting assembly is arranged on the bit body. The bit body is connected to an external rotary mechanism and a pressurizing mechanism, and drives the cutting assembly to apply a rotary torque and an axial pressure, so that the cutting assembly breaks rocks during rotation to complete the drilling work.

[0026] Specifically, Figure 1 FIG. is a schematic structural diagram of an anti-collision hybrid drill bit provided by an embodiment of the present application, Figure 2 FIG. is a schematic structural diagram of a cutting blade 3 and a double-row rear-tilt support tooth 8 in an anti-collision hybrid drill bit provided by an embodiment of the present application, as shown in Figure 1 、 Figure 2 As shown, the drill bit body includes a drill bit shank 1 and a plurality of cutting blades 3 that converge at one end and extend outward at the other end, and the cutting blades 3 are located at the top of the drill bit shank 1. Figure 4 FIG. is an exploded schematic structural diagram of a cutting blade in an anti-collision hybrid drill bit provided by an embodiment of the present application. As shown in Figure 4 As shown, the cutting blade 3 successively forms an inner cone portion 4, a nose shoulder portion 5, and a gauge portion 6 from the inside to the outside. Adjacent cutting blades 3 are angled with respect to each other, and a roller assembly 2 is provided between every two adjacent cutting blades 3; the cutting assembly includes first cutting teeth 7 distributed on the outer surface of the inner cone portion 4 and the outer surface of the nose shoulder portion 5, and double-row rear-tilt support teeth 8 distributed on the outer surface of the nose shoulder portion 5 and the outer surface of the gauge portion 6.

[0027] The drill bit shank 1 is cylindrical. The material of the drill bit shank 1 needs to consider its wear resistance, heat resistance and other properties, and can be made of other metal materials such as commonly used tungsten steel, high-speed steel, high-speed steel in the prior art. There is no specific material limitation in this application.

[0028] In this application, the top end of the drill bit shank 1 refers to the end of the drill bit body that first contacts the soil layer. A plurality of roller assemblies 2 and a plurality of cutting blades 3 are provided on the drill bit shank 1, and a roller assembly 2 is provided between every two adjacent cutting blades 3. In an embodiment of this application, there are three roller assemblies 2 and three cutting blades 3 on the drill bit shank 1. Among them, one end of the plurality of cutting blades 3 is connected to the top end of the drill bit shank 1 and converges at the center point of the top end of the drill bit shank 1, and the other end extends along the radial direction of the drill bit shank 1 in an arc-shaped trajectory and finally forms an integral body with the outer side wall of the drill bit shank 1, and the angle between any two adjacent cutting blades 3 is equal.

[0029] The part of the cutting blade 3 connected to the top end of the drill bit shank 1 is the inner cone portion 4, the highest raised part of the cutting blade 3 is the nose shoulder portion 5, and the part where the raised height of the cutting blade 3 begins to fall and is connected to the outer side wall of the drill bit shank 1 is the gauge portion 6.

[0030] There are multiple first cutting teeth 7 in this application, and the multiple first cutting teeth 7 are arranged side by side on the front surface of the inner cone part 4 and the front surface of the nose shoulder part 5 of the cutting blade 3. It should be noted that the front surface here refers to the side of the cutting blade 3 that conforms to the rotation direction of the drill bit body. When the drill bit body rotates, the front surface of the cutting blade 3 and the cutting surface of the first cutting teeth 7 directly come into contact with the soil layer. During the drilling operation, the drill bit shank 1 drives the cutting blade 3 to rotate. The cutting surface of the first cutting teeth 7 has a certain inclination angle, which is also called the cutting angle. The first cutting teeth 7 generate a cutting force on the soil layer and rock, forming a way of plowing rock breaking in the inner row of the drill bit. Among them, the cutting angle of the first cutting teeth 7 is determined according to the actual use scenario and requirements of the type. In this application, there is no specific limitation.

[0031] As an optional embodiment, the material of the first cutting teeth 7 is a diamond composite sheet and is directly inlaid on the cutting blade 3. The setting method of the first cutting teeth 7 on the cutting blade 3 is the same as that of the commonly used PDC drill bit, and will not be elaborated here too much.

[0032] The double-row rear-tilt support teeth 8 are distributed on the outer surface of the nose shoulder part 5 and the outer surface of the gauge protection part 6. During the actual use process, compared with the traditional PDC drill bit, the double-row rear-tilt support teeth 8 in this application replace some of the first cutting teeth 7, reducing the number of the first cutting teeth 7 and weakening the cutting ability of the outer row of the drill bit. However, at the same time, the double-row rear-tilt support teeth 8 can cooperate with the roller cone assembly 2 to enhance the impact force of the outer row of the drill bit and make up for the cutting force loss due to the reduction in the number of the first cutting teeth 7 to ensure the overall rock-breaking strength of the drill bit.

[0033] During the actual use process, the setting quantity and coverage area of the double-row rear-tilt support teeth 8 can be flexibly adjusted according to the drilling spacing. That is, when the spacing between adjacent directional wells in a cluster platform is relatively close, the distance between the casings of adjacent wells is small, and the drilling accuracy requirement is relatively high. At this time, the quantity of the double-row rear-tilt support teeth 8 can be increased, and the coverage area of the double-row rear-tilt support teeth 8 on the nose shoulder part 5 can be expanded, that is, the double-row rear-tilt support teeth 8 cover the entire section of the gauge protection part 6 and most of the area of the nose shoulder part 5, further reducing the cutting force of the first cutting teeth 7. On the contrary, when the drilling accuracy requirement is relatively low, the coverage area of the double-row rear-tilt support teeth 8 on the nose shoulder part 5 can be reduced, that is, the double-row rear-tilt support teeth 8 cover the entire surface of the gauge protection part 6 and a small part of the area of the nose shoulder part 5.

[0034] Furthermore, see Figure 2 , the double-row rear-tilt support teeth 8 include the front row support teeth 801 located on the front surface of the nose shoulder part 5 and the front surface of the gauge protection part 6 and the rear row support teeth 802 located on the side surface of the nose shoulder part 5 and the side surface of the gauge protection part 6.

[0035] The front here refers to the side where the cutting blade 3 conforms to the rotation direction of the drill bit body. The side refers to the side where the cutting blade 3 extends away from the center point of the drill bit shank 1. The number of the front row support teeth 801 and the rear row support teeth 802 is multiple and they are all arranged longitudinally. When the drill bit body rotates, the front row support teeth 801 and the first cutting teeth 7 collide with the soil layer simultaneously first to generate an impact force on the outer row of the drill bit, and the rear row support teeth 802 can generate an impact force secondly to share part of the impact load, reduce the impact pressure on the front row support teeth 801, and extend the overall service life of the double-row rear-tilt support teeth 8.

[0036] Further, see Figure 1 , a threaded connection end 101 for connecting with an external power end is provided at the bottom of the drill bit shank 1. The external power end includes a drill pipe, a drill rig or other equipment. During the drilling process, the external power end mainly applies a rotational force to make the entire drill bit body start to rotate, and the cutting component and the roller cone assembly 2 start to break rocks. At the same time, the drill rig or other equipment will also apply an impact force towards the drill bit body to increase the rock-breaking speed. The drill pipe and the drill rig are common existing components and will not be listed one by one here.

[0037] Figure 3 This is a top view of an anti-collision hybrid drill bit provided by an embodiment of the present application. As Figure 3 shown, during the drilling construction process, as the drill bit body and the cutting component continuously penetrate into the well, due to high-speed friction, the drill bit body and the cutting component will continuously be in an ultra-high temperature working environment, and it is easy to cause thermal damage to the drill bit and accelerate the wear of the drill bit. At the same time, as the drill bit body continuously advances downward, the cuttings, mud, etc. of the drilled formation will also wrap around the cutting component, reducing the cutting force of the cutting component and affecting the drilling efficiency. Therefore, a plurality of drilling fluid nozzles 102 are provided at the top end of the drill bit shank 1 in the present application. The drilling fluid nozzles 102 are inclined, and the injection direction of the drilling fluid nozzles 102 forms an angle of 5° to 50° with the central axis of the drill bit shank 1.

[0038] Specifically, a plurality of channels are opened at appropriate positions in the inner cavity of the drill bit body, and the inflow end of the channels is communicated with an external drilling fluid pressurizing device. The drilling fluid nozzles 102 are arranged at the outflow end of the channels, forming a passage for the drilling fluid to enter the bottom of the well from inside the drill pipe. The drilling fluid nozzles 102 can continuously eject drilling fluid during the drilling process to wash the bottom of the hole and the cutting component, help remove the cuttings at the bottom of the well and carry them out, reduce wear, improve the cooling effect, ensure the stable operation of the drill bit, and improve the drilling speed and quality.

[0039] The drilling fluid nozzle 102 in this application is inclined, and the inclination angle is 5° to 50°. Here, the inclination angle is based on the central axis of the drill bit body, that is, the angle coinciding with the central axis of the drill bit body is 0°. The inclination direction of the drilling fluid nozzle 102 has no specific limitation in this application and can be flexibly adjusted according to actual usage requirements to maximize the spraying area of the drilling fluid nozzle 102 to cover the cutting blade 3 and the surface of the cone assembly 2. In one implementation of this application, the number of drilling fluid nozzles 102 is multiple, and an equal number of drilling fluid nozzles 102 are provided between every two adjacent cone assemblies 2.

[0040] Further, see Figure 2 、 Figure 3 The cone assembly 2 includes a cone shank portion 201. The bottom of the cone shank portion 201 is integrally formed with the top end of the drill bit shank 1. A cutting cone 202 is rotatably provided at the top of the cone shank portion 201. The bottom of the cone shank portion 201 is integrally formed with the drill bit shank 1, and the top end of the cone shank portion 201 extends away from the center of the drill bit shank 1. A rotating shaft assembly is provided at the top end of the cone shank portion 201. The rotating shaft assembly connects the cone shank portion 201 and the cutting cone 202, enabling the cutting cone 202 to rotate around the rotating shaft assembly as the center point. At the same time, the disk surface of the cutting cone 202 fits against the inner side wall of the top end of the cone shank portion 201, making the cutting cone 202 also in a diffused shape, increasing the rock-breaking area.

[0041] Further, second cutting teeth 203 are provided on the cutting cone 202, and the second cutting teeth 203 are arranged along the circumference of the cutting cone 202. The number of the second cutting teeth 203 is multiple, and the multiple second cutting teeth 203 are distributed around the wheel surface of the cutting cone 202 for one week. During the drilling process, the drill bit body rotates. While the cutting cone 202 makes a revolution following the drill bit body, the cutting cone 202 itself also rotates. The second cutting teeth 203 on the cutting cone 202 directly generate impact force, rolling force, and shear force on the soil layer and rock, and push the rock debris backward, facilitating the removal of mud and slag.

[0042] In the actual use process, the material of the second cutting teeth 203 is often made of cemented carbide. For the convenience of description, the second cutting teeth 203 arranged around the cutting cone 202 for one week are referred to as a group. As an optional embodiment, the second cutting teeth 203 in this application are multiple groups, and the multiple groups of second cutting teeth 203 are arranged at intervals along the thickness direction of the wheel surface of the cutting cone 202.

[0043] Furthermore, the rock-breaking depth of the second cutting tooth 203 is greater than that of the first cutting tooth 7 located at the nose shoulder 5. The cutting blade 3 in this application is arc-shaped, and the nose shoulder 5 is the highest point of the cutting blade 3, where the rock-breaking depth is the deepest. The deepest point of the rock-breaking depth of the cone bit assembly 2 is located at the highest point of the tooth surface of the cutting cone 202. During the actual drilling rock-breaking process, the second cutting teeth 203 on the cone bit assembly 2 alternately contact the bottom of the well. The rock-breaking torque is small, the contact area between the second cutting teeth 203 and the bottom of the well is small, the specific pressure is high, and the crushing ability is strong. Compared with the second cutting teeth 203, the impact resistance of the first cutting teeth 7 is slightly worse, and the first cutting teeth 7 are prone to chipping and wear for hard formations. Therefore, in this application, during drilling, the second cutting teeth 203 will first contact the bottom of the well for preliminary rock-breaking to protect the first cutting teeth 7.

[0044] Furthermore, the outer ends of the double-row rearward-inclined support teeth 8 are cylindrical, conical, spherical or arc-shaped, and the rearward-inclined angle of the front-row support teeth 801 is smaller than that of the rear-row support teeth 802. The double-row rearward-inclined support teeth 8 are mainly used to reduce the outer-row cutting force of the anti-collision hybrid bit in this application. Therefore, the outer ends of the double-row rearward-inclined support teeth 8, that is, the ends of the double-row rearward-inclined support teeth 8 far from the bit shank 1, do not generate cutting force. In this application, the outer ends of the double-row rearward-inclined support teeth 8 can be flat or arc-shaped, depending on the actual use requirements.

[0045] During the drilling process, the double-row rearward-inclined support teeth 8 mainly generate impact force on the soil layer rock. Therefore, the inclined double-row rearward-inclined support teeth 8 can reduce the impact reaction force borne by themselves and extend the service life. The smaller the rearward-inclined angle, the greater the impact force generated on the soil layer rock. During the rotation of the bit body, the front-row support teeth 801 generate the main impact force on the soil layer rock, and the rear-row support teeth 802 generate the auxiliary impact force on the soil layer rock. Therefore, in this application, the rearward-inclined angle of the front-row support teeth 801 is smaller than that of the rear-row support teeth 802.

[0046] As an optional embodiment, in this application, the rearward-inclined angle of the front-row support teeth 801 is between 10° and 60°, and the rearward-inclined angle of the rear-row support teeth 802 is between 20° and 90°. It should be noted that the "rearward inclination" here refers to the inclination in the direction opposite to the rotation direction of the bit body. The rearward-inclined angle of the front-row support teeth 801 takes the horizontal line connecting the central axis of the bit body and the center point of the front-row support teeth 801 as the zero-degree line. Similarly, the rearward-inclined angle of the rear-row support teeth 802 takes the horizontal line connecting the central axis of the bit body and the center point of the rear-row support teeth 802 as the zero-degree line.

[0047] Further, a diameter protection component 9 is provided on the outer surface of the drill bit body, and the diameter protection component 9 is located below the double-row rear-tilt support teeth 8. Specifically, the diameter protection component 9 includes a plurality of diameter protection teeth distributed on the outer surface of the drill bit body. The diameter protection teeth can not only maintain the drilling specification and size, but also reduce the working burden of the drill bit and the frictional loss of the drill bit. The diameter protection teeth are common components in the drilling technology field and will not be elaborated here.

[0048] The working principle of the anti-collision hybrid drill bit in this application is as follows. During the drilling and rock-breaking process, the second cutting teeth 203 in the cone assembly 2, the first cutting teeth 7 on the nose shoulder 5, and the first cutting teeth 7 on the inner cone part 4 successively contact the soil layer. The first cutting teeth 7 on the nose shoulder 5 and the first cutting teeth 7 on the inner cone part 4 form a plowing rock-breaking method. After entering the well, the double-row rear-tilt support teeth 8 contact the inner wall of the wellbore, weakening the outer row cutting force and effectively reducing the damage to adjacent casings. However, at the same time, the double-row rear-tilt support teeth 8 can cooperate with the cone assembly 2 to increase the impact force of the outer row of the anti-collision hybrid drill bit in this application to fill the weakened outer row cutting force and ensure the rock-breaking efficiency of the drill bit.

[0049] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0050] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0051] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A collision-proof hybrid drill bit, characterized in that: include: A drill body, the drill body comprising a drill shank (1) and a plurality of cutting blades (3) with one end converging together and the other end extending outward, wherein the cutting blades (3) are located at the top of the drill shank (1), the cutting blades (3) sequentially form an inner cone portion (4), a nose shoulder portion (5) and a gauge portion (6) from the inside to the outside, two adjacent cutting blades (3) form an angle with each other, and a cone assembly (2) is provided between each two adjacent cutting blades (3); A cutting assembly, the cutting assembly comprising first cutting teeth (7) distributed on the outer surface of the inner cone (4) and the outer surface of the nose shoulder (5), and double rows of backward-inclined supporting teeth (8) distributed on the outer surface of the nose shoulder (5) and the outer surface of the gauge portion (6); The double-row rearward-inclined support teeth (8) include a front-row support tooth (801) located on the front of the nose shoulder (5) and the front of the gauge protection portion (6), and a rear-row support tooth (802) located on the side of the nose shoulder (5) and the side of the gauge protection portion (6); the outer ends of the double-row rearward-inclined support teeth (8) are cylindrical, conical, ball-headed or arc-shaped, and the rearward-inclined angle of the front-row support teeth (801) is smaller than the rearward-inclined angle of the rear-row support teeth (802).

2. The anti-collision mixing drill bit according to claim 1, characterized in that: The bottom of the drill handle (1) is provided with a threaded connection end (101) for connecting to an external power end.

3. The anti-collision mixing drill bit according to claim 2, characterized in that: A plurality of drilling fluid nozzles (102) are provided at the top of the drill bit shank (1). The drilling fluid nozzles (102) are arranged at an angle, and the included angle between the spraying angle of the drilling fluid nozzles (102) and the central axis of the drill bit shank (1) is 5° to 50°.

4. The anti-collision mixing drill bit according to claim 1, characterized in that: The convergence point of the plurality of cutting blades (3) is located at the center point of the top end of the drill shank (1), and the angles between any two adjacent cutting blades (3) are equal.

5. The anti-collision mixing drill bit according to claim 1, characterized in that: The cone assembly (2) comprises a cone palm portion (201), the bottom of the cone palm portion (201) is integrally formed with the top of the drill shank (1), and a cutting cone (202) is rotatably provided on the top of the cone palm portion (201).

6. The anti-collision mixing drill bit according to claim 5, characterized in that: The cutting tooth wheel (202) is provided with second cutting teeth (203), and the second cutting teeth (203) are arranged along a circle of the wheel surface of the cutting tooth wheel (202).

7. The anti-collision mixing drill bit according to claim 6, characterized in that: The rock breaking depth of the second cutting tooth (203) is greater than the rock breaking depth of the first cutting tooth (7) located on the nose shoulder (5).

8. The anti-collision mixing drill bit according to claim 1, characterized in that: A diameter protection component (9) is provided on the outer surface of the drill body, and the diameter protection component (9) is located below the double-row backward-inclined supporting teeth (8).

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