Multi-functional high-efficiency roller bit

Abstract

The application provides a multifunctional high-efficiency roller bit, and belongs to the technical field of drilling equipment. The multifunctional high-efficiency roller bit comprises a bit seat, three jaws, a roller set and a plurality of first oil holes. The three jaws are slidably arranged on the bit seat, and a first cavity is arranged between each jaw and the bit seat. The roller set comprises a first roller, a second roller and a third roller, and the first roller, the second roller and the third roller are installed on corresponding jaws. The plurality of first oil holes are arranged in the bit seat and are in communication with corresponding first cavities, and the first oil holes are used for changing the volume of the first cavities by flowing hydraulic oil into the first cavities. The jaws are used for sliding the first roller, the second roller and the third roller in a direction away from the bit seat by a certain distance by increasing the volume of the first cavities. The multifunctional high-efficiency roller bit provided by the application improves the acting force between part of the rollers and the stratum, thereby improving the drilling efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling equipment, and more particularly to a multifunctional high-efficiency roller bit. BACKGROUND

[0002] The roller bit is divided into two types according to the material and structure of the roller cutting tooth, the first type is a steel tooth roller bit, and the cutting tooth on the roller is entirely milled from the roller body material, and the second type is a toothed roller bit, and the cutting tooth on the roller is entirely a hard alloy tooth embedded in the roller. The mechanical drilling speed of the steel tooth roller is high, but the cutting tooth has poor wear resistance, and the nose of the bit is the lowest part of the bit relative to the bottom of the well during drilling, and the rock annulus around the bottom of the well has not been released, so it is the most difficult to break, and the radius and area of the rock annulus at the bottom of the well are larger, and the number of cutting teeth is relatively small, and the breaking area of each cutting tooth is larger.

[0003] During drilling, various unexpected problems may occur, such as the bit contacting a rock layer with high hardness. In the prior art, multiple rollers of the bit simultaneously contact the rock layer with high hardness, although drilling can be completed, but it takes a long time, ultimately resulting in low drilling efficiency. SUMMARY

[0004] The purpose of the present application is to provide a multifunctional high-efficiency roller bit, which aims to solve the problem of small action force of multiple rollers and low drilling efficiency.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is to provide a multifunctional high-efficiency roller bit, comprising:

[0006] A bit seat;

[0007] Three jaws, the three jaws are slidingly arranged on the bit seat, and a first cavity is arranged between each jaw and the bit seat;

[0008] A roller group, the roller group comprises a first roller, a second roller and a third roller, the first roller, the second roller and the third roller are installed on the corresponding jaws;

[0009] A plurality of first oil holes are arranged in the bit seat and communicate with the corresponding first cavities, and the first oil holes are used to change the volume of the first cavities by flowing hydraulic oil into the first cavities;

[0010] The jaws are used to make the first roller, the second roller and the third roller slide a certain distance away from the bit seat by increasing the volume of the first cavities.

[0011] In a possible implementation, the first roller has a greater hardness than the second roller and the third roller; the second roller has a greater specific pressure than the first roller and the third roller; and the third roller has a greater wear resistance than the first roller and the second roller.

[0012] In a possible implementation, a limiting rod is fixed on the claw, and the limiting rod is in plug-in cooperation with the drill bit seat.

[0013] In a possible implementation, the limiting rod is integrally formed with the claw.

[0014] In a possible implementation, the drill bit seat is provided with a second cavity at the top, the limiting rod penetrates through the first cavity and extends into the second cavity; a positioning disc is sleeved at the end of the limiting rod away from the claw, the positioning disc is in sliding cooperation with the second cavity, the drill bit seat is provided with a second oil hole in communication with the second cavity, and the second oil hole is used to guide hydraulic oil into the second cavity to make the first roller, the second roller and the third roller slide a certain distance towards the drill bit seat.

[0015] In a possible implementation, the top of the drill bit seat is provided with a mounting disc, the limiting rod penetrates through the mounting disc, and the mounting disc, the limiting rod, the positioning disc and the drill bit seat surround to form the second cavity.

[0016] In a possible implementation, the mounting disc is located between the first cavity and the second cavity; and the mounting disc, the drill bit seat and the claw surround to form the first cavity.

[0017] In a possible implementation, the number of the first oil hole and the second oil hole is three, the first oil hole is in communication with a first oil pump, the second oil hole is in communication with a second oil pump, and the first oil pump and the second oil pump cooperate to position the first roller, the second roller and the third roller at a specific position of the drill bit seat.

[0018] In a possible implementation, a reversing block is rotatably arranged in the drill bit seat, the reversing block is provided with a first communication hole and a second communication hole, the first communication hole is used to communicate the first oil hole with the first oil pump, the second communication hole is used to communicate the second oil hole with the second oil pump, and the reversing block is used to block the corresponding first oil hole and second oil hole.

[0019] In a possible implementation, the reversing block is arranged at the end of the plurality of first oil holes and the plurality of oil holes, the drill bit seat is internally provided with a first hole and a second hole, the first hole and the second hole are respectively used for connecting the first oil pump with the first communication hole and connecting the second oil pump with the second communication hole; a first annular groove and a second annular groove are arranged along the circumference of the reversing block, the first annular groove is used for guiding the hydraulic oil discharged from the first hole to the first communication hole, and the second annular groove is used for guiding the hydraulic oil discharged from the second hole to the second communication hole.

[0020] The multifunctional high-efficiency roller bit has the advantages that, compared with the prior art, three claws are slidably arranged on the drill bit seat, and a first cavity is arranged between each claw and the drill bit seat; a first roller, a second roller and a third roller are arranged on each claw; and a plurality of first oil holes are arranged in the drill bit seat and communicate with the first cavity.

[0021] In actual application, the three rollers in the roller set are driven to move by the drill bit seat; when the first oil hole guides the hydraulic oil into the first cavity, the first cavity is enlarged, and the hydraulic oil has an acting force on the corresponding claw, the acting force makes the first roller, the second roller or the third roller slide away from the drill bit seat by a certain distance, and finally the acting force of the part of the rollers on the stratum is improved, thereby improving the drilling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0023] Figure 1 A structural schematic diagram of the multifunctional high-efficiency roller bit provided by the first embodiment of the present application is shown in the figure.

[0024] Figure 2 A structural schematic diagram of the multifunctional high-efficiency roller bit provided by the second embodiment of the present application is shown in the figure.

[0025] Figure 3 A structural schematic diagram of the multifunctional high-efficiency roller bit provided by the second embodiment of the present application is shown in the figure. Figure 2 A local enlarged view of position A in the figure.

[0026] Figure 4 A structural schematic diagram of the reversing block provided by the present application is shown in the figure.

[0027] In the figure: 1, drill bit seat; 2, jaw; 3, first roller; 4, second roller; 5, second communication hole; 6, reversing block; 7, first communication hole; 8, first hole; 9, second hole; 10, limiting rod; 11, second oil hole; 12, first oil hole; 13, positioning disc; 14, mounting disc; 15, second annular groove; 16, first annular groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0029] Please refer to Figures 1 to 3 , now the multifunctional high-efficiency roller bit provided by the present application will be described. The multifunctional high-efficiency roller bit comprises a drill bit seat 1, three jaws 2, a roller set and a plurality of first oil holes 12. The three jaws 2 are all slidingly arranged on the drill bit seat 1, and a first cavity is arranged between each jaw 2 and the drill bit seat 1. The roller set comprises a first roller 3, a second roller 4 and a third roller, and the first roller 3, the second roller 4 and the third roller are all mounted on the corresponding jaw 2. The plurality of first oil holes 12 are all arranged through the drill bit seat 1 and are in communication with the corresponding first cavity, and the first oil holes 12 are used to change the volume of the first cavity by flowing hydraulic oil into the first cavity. The jaws 2 are used to make the first roller 3, the second roller 4 and the third roller slide a certain distance away from the drill bit seat 1 by means of the increase of the volume of the first cavity.

[0030] The multifunctional high-efficiency roller bit provided by the present application has the beneficial effect that, compared with the prior art, the three jaws 2 in the multifunctional high-efficiency roller bit of the present application are all slidingly arranged on the drill bit seat 1, and a first cavity is arranged between each jaw 2 and the drill bit seat 1. The first roller 3, the second roller 4 and the third roller are all mounted on the three jaws 2, and a plurality of first oil holes 12 are arranged through the drill bit seat 1 and are in communication with the first cavity.

[0031] In actual application, the three rollers in the roller set are driven to move by the drill bit seat 1, and when the first oil holes 12 introduce hydraulic oil into the first cavity, the volume of the first cavity increases and the hydraulic oil has a force on the corresponding jaw 2, which makes the first roller 3, the second roller 4 or the third roller slide a certain distance away from the drill bit seat 1, and the final result is to improve the force of part of the rollers on the formation, thereby improving the drilling efficiency.

[0032] In some embodiments of the multifunctional high-efficiency roller bit provided in the application, the hardness of the first roller 3 is greater than that of the second roller 4 and the third roller; the specific pressure of the second roller 4 is greater than that of the first roller 3 and the third roller; and the wear resistance of the third roller is greater than that of the first roller 3 and the second roller 4.

[0033] With the deepening of oil and gas field exploration and development, the formation structure encountered during drilling is becoming more and more complex, the drilling difficulty is becoming greater and greater, and the drilling cost is increasing year by year. Therefore, how to accurately determine the drilling scheme is extremely important for oil and gas field development. The roller bit is a commonly used drilling tool. The roller bit is the most widely used drilling bit. When the roller bit works, the cutting teeth alternately contact the bottom of the well, the rock breaking torque is small, the contact area between the cutting teeth and the bottom of the well is small, the specific pressure is high, and the formation is easily eaten; the total length of the working blade is large, thereby relatively reducing the wear. The roller bit can adapt to various formations from soft to hard.

[0034] The existing roller bit relies on the setting of the palm tip cladding layer to resist the wear of the well wall, so as to improve the service life of the bit gauge. However, due to the influence of the cladding material and process, the wear resistance of the bit is unstable, and the palm tip wear phenomenon is still very common in use. In addition, the palm tip is also subjected to high heat generated by friction with the well wall, which further affects the service life of the sealing rubber ring at the sealing position.

[0035] In order to make the bit suitable for different types of formations during drilling, each bit is set to be of different types in the application. Ultimately, the hardness of the first bit is relatively large, the specific pressure of the second bit is relatively large, and the wear resistance of the third bit is relatively high. Under normal circumstances, the distances of the three bits to the bit seat 1 are the same. When different rock layers are contacted, the first cavity of the corresponding jaw 2 is increased, so that the corresponding roller first contacts the rock layer, thereby performing targeted and early treatment on the rock, reducing the required time, improving the drilling effect of the roller bit in the formation, and increasing the service life.

[0036] In some embodiments of the multifunctional high-efficiency roller bit provided in the application, please refer to Figure 2 and Figure 3 The jaw 2 is fixed with a limiting rod 10, and the limiting rod 10 is inserted and matched with the bit seat 1. The traditional jaw 2 is integrally formed with the bit seat 1, mainly to ensure the connection strength between the jaw 2 and the bit seat 1. However, if the jaw 2 is integrally formed with the bit seat 1, the position of the roller relative to the bit seat 1 will remain unchanged. Ultimately, the multiple rollers on the bit seat 1 will simultaneously contact the formation, thereby reducing the acting force on the formation and reducing the drilling effect.

[0037] In the present application, the volume of the first cavity is changed by hydraulic oil, so that the roller suitable for the current formation is in contact and drilling in advance, so as to realize the targeted treatment of different formations. In order to ensure the sliding direction of the jaw 2 relative to the drill bit seat 1, that is, the reliable connection of the two, a limiting rod 10 is fixed on the jaw 2, and the limiting rod 10 is in sliding fit with the drill bit seat 1.

[0038] By matching the limiting rod 10 with the drill bit seat 1, it is ensured that the jaw 2 and the drill bit seat 1 can maintain relative stability, and more importantly, the jaw 2 will be subjected to a force directed towards the drill bit seat 1 during drilling, so that the problem of the jaw 2 slipping off the drill bit seat 1 does not occur.

[0039] In some embodiments of the multifunctional high-efficiency roller bit provided in the present application, please refer to Figure 2 and Figure 3 The limiting rod 10 is integrally formed with the jaw 2. By integrally forming the jaw 2 with the limiting rod 10, the connection strength of the limiting rod 10 and the drill bit seat 1 can be greatly improved, so as to avoid the problem of cracks or even breakage between the jaw 2 and the limiting rod 10, and improve the service life. However, due to the surrounding first cavity, the overall strength between the jaw 2 and the drill bit seat 1 is relatively low compared to the integral forming, in order to solve this problem, it is necessary to improve the integration level, that is, to correspondingly reduce the size of the first cavity. In order to solve this problem, the limiting rod 10 penetrates the first cavity in the present application, and the above setting will not affect the movement of the roller relative to the drill bit seat 1.

[0040] In some embodiments of the multifunctional high-efficiency roller bit provided in the present application, please refer to Figure 2 and Figure 3 The drill bit seat 1 is provided with a second cavity at the top, the limiting rod 10 penetrates the first cavity and extends into the second cavity; a positioning disc 13 is sleeved on the end of the limiting rod 10 away from the jaw 2, the positioning disc 13 is in sliding fit with the second cavity, and the drill bit seat 1 is provided with a second oil hole 11 in communication with the second cavity, the second oil hole 11 is used for guiding the hydraulic oil into the second cavity for sliding the first roller 3, the second roller 4 and the third roller a certain distance close to the drill bit seat 1.

[0041] By injecting hydraulic oil into the first cavity, the distance between the roller and the drill bit seat 1 can be changed during drilling, so that different rollers are used for different scenes to improve efficiency and prolong the service life of the entire drill bit.

[0042] The roller bit in the application will be subjected to the force of the front formation during drilling. The roller bit will not slide off the bit seat 1 due to the force. However, if only the first cavity is arranged and without drilling, the external force will cause the jaw 2 to slide off the bit seat 1. Once the force of the formation on the roller bit becomes small or even disappears, the position of the roller bit and the bit seat 1 cannot be effectively ensured.

[0043] To solve the problem, the second cavity is arranged in the bit seat 1. The second oil hole 11 can guide the hydraulic oil into the second cavity. In the second cavity, the position of the bit seat 1 remains unchanged and only the positioning disc 13 is slidingly matched in the second cavity. As the hydraulic oil in the second cavity increases, the positioning disc 13 is driven to slide, and the sliding of the positioning disc 13 finally drives the limiting rod 10 and the jaw 2 to move towards the bit seat 1. Finally, under the joint action of the hydraulic oil in the first cavity and the second cavity, the position of the corresponding roller bit is ensured to be stable.

[0044] In some embodiments of the multifunctional and high-efficiency roller bit provided in the application, please refer to Figure 2 and Figure 3 The top of the bit seat 1 is provided with the mounting disc 14. The limiting rod 10 penetrates through the mounting disc 14. The mounting disc 14, the limiting rod 10, the positioning disc 13 and the bit seat 1 surround to form the second cavity.

[0045] To make a more detailed description, the mounting disc 14 is fixed on the bit seat 1 after the positioning disc 13 is arranged and seals the second cavity. Before installation, the top of the second cavity is open. Then the positioning disc 13 is sleeved on the limiting rod 10 and arranged in the second cavity. The positioning disc 13 and the bottom of the second cavity can be filled with a certain expansion body to avoid that the movement of the positioning disc 13 is finally limited due to the negative pressure between the bottom of the second cavity and the positioning disc 13 because of the sliding of the positioning disc 13.

[0046] After the positioning disc 13 is installed, the mounting disc 14 is fixed on the bit seat 1 to make the second cavity in a relatively closed state. After the hydraulic oil is injected into the second cavity through the second oil hole 11, the distance between the mounting disc 14 and the positioning disc 13 becomes large. Under the action of the positioning disc 13, the corresponding jaw 2 and the roller bit are driven to move towards the bit seat 1.

[0047] In some embodiments of the multifunctional and high-efficiency roller bit provided in the application, please refer to Figure 2 and Figure 3 The mounting disc 14 is located between the first cavity and the second cavity. The mounting disc 14, the bit seat 1 and the jaw 2 surround to form the first cavity.

[0048] In order to improve the integration level, the top surface of the mounting disc 14, the drill bit seat 1 and the jaw 2 are surrounded to form a first cavity. Since the position of the mounting disc 14 is unchanged relative to the drill bit seat 1, when the hydraulic oil is injected into the first cavity through the first oil hole 12, the jaw 2 is pushed to move, so that the distance between the jaw 2 and the mounting disc 14 is increased, thereby completing the adjustment of the position of the cone.

[0049] In some embodiments of the multifunctional high-efficiency cone drill provided in the application, please refer to Figure 2 and Figure 3 The number of the first oil hole 12 and the second oil hole 11 is three, the first oil hole 12 is communicated with the first oil pump, the second oil hole 11 is communicated with the second oil pump, and the first oil pump and the second oil pump are used in cooperation to position the first cone 3, the second cone 4 and the third cone at a specific position of the drill bit seat 1.

[0050] In the application, the number of the jaw 2 is three, and the first cone 3, the second cone 4 and the third cone are respectively installed on the three jaws 2. In order to realize that the first cone 3, the second cone 4 and the third cone can independently move relative to the drill bit seat 1, the number of the corresponding first oil hole 12 and the second oil hole 11 is three, the first oil pump is used to inject hydraulic oil into the corresponding first oil hole 12, and the second oil pump is used to inject hydraulic oil into the corresponding second oil hole 11.

[0051] The plurality of first oil holes 12 and the plurality of second oil holes 11 are one-to-one corresponding. When the corresponding volume of hydraulic oil is injected into the first cavity and the second cavity, in order to maintain the stability of the position of the cone, the first oil hole 12 and the second oil hole 11 are in a closed state at this time, and the hydraulic oil cannot flow at this time. And when the drill bit is taken out from the underground, the amount of hydraulic oil in the second cavity is greater than the amount of hydraulic oil in the first cavity, so that the jaw 2 moves to the drill bit seat 1 under the action of the hydraulic oil, thereby avoiding the sliding of the jaw 2.

[0052] In some embodiments of the multifunctional high-efficiency cone drill provided in the application, please refer to Figure 2 、 Figure 3 and Figure 2 The drill bit seat 1 is rotatably provided with a reversing block 6, the reversing block 6 is provided with a first communication hole 7 and a second communication hole 5, the first communication hole 7 is used to communicate the first oil hole 12 with the first oil pump, the second communication hole 5 is used to communicate the second oil hole 11 with the second oil pump, and the reversing block 6 is used to block the corresponding first oil hole 12 and the second oil hole 11.

[0053] In order to reduce the volume, the first oil pump and the second oil pump are both one, but in order to make the hydraulic oil in the first oil pump and the second oil pump pump into the corresponding first cavity and second cavity, the reversing block 6 is arranged on the drill bit seat 1, the first communication hole 7 in the reversing block 6 is communicated with the first oil pump at one end and communicated with the corresponding first oil hole 12 at the other end. The second communication hole 5 in the reversing block 6 is communicated with the second oil pump at one end and communicated with the corresponding second oil hole 11 at the other end. And the angle of the rotation of the reversing block 6 is certain, that is, by controlling, the first communication hole 7 can be communicated with the first oil hole 12 at the same time, and the second communication hole 5 can be communicated with the corresponding second oil hole 11, and the remaining first oil hole 12 and second oil hole 11 are in a blocked state.

[0054] Through the above arrangement, after the reversing block 6 rotates by a certain angle, the hydraulic oil in the first oil pump and the second oil pump can be injected into the corresponding first cavity and second cavity, and finally the corresponding first roller 3, second roller 4 and third roller are moved.

[0055] In some embodiments of the multifunctional high-efficiency roller bit provided in the present application, please refer to Figure 3 and Figure 4 Figure 2 Figure 4 , the reversing block 6 is arranged at the end of the plurality of first oil holes 12 and the plurality of oil holes, the first hole 8 and the second hole 9 are arranged in the drill bit seat 1, the first hole 8 and the second hole 9 are respectively used for communicating the first oil pump with the first communication hole 7 and communicating the second oil pump with the second communication hole 5; the first annular groove 16 and the second annular groove 15 are arranged along the circumference of the reversing block 6, the first annular groove 16 is used for draining the hydraulic oil discharged from the first hole 8 to the first communication hole 7, and the second annular groove 15 is used for draining the hydraulic oil discharged from the second hole 9 to the second communication hole 5.

[0056] Since the rotation of the reversing block 6 by a certain angle needs to make the hydraulic oil in the first oil pump and the second oil pump flow into the corresponding first oil hole 12 and second oil hole 11, the first communication hole 7 and the second communication hole 5 in the reversing block 6 need to be always communicated with the corresponding first oil pump and second oil pump, in order to achieve the above technical effect, the first annular groove 16 and the second annular groove 15 are arranged at the corresponding position of the reversing block 6, at this time, during the rotation of the reversing block 6, the first annular groove 16 is always communicated with the first hole 8, and the second annular groove 15 is always communicated with the second hole 9.

[0057] And after the reversing block 6 rotates by a certain angle, the hydraulic oil flows from the first annular groove 16 into the first communication hole 7, and then flows from the first communication hole 7 into the first oil hole 12 until it flows into the first cavity, when the reversing block 6 rotates by a certain angle again, since the positions of the first communication hole 7 and the second communication hole 5 change, the backflow of the injected hydraulic oil is prevented, since the hydraulic oil itself has a certain hydraulic pressure and cannot flow out of the first cavity and the second cavity, the position of the dog 2 is relatively fixed.

[0058] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-functional high-efficiency roller cone drill bit, characterized by, The drill bit comprises: a drill bit seat; three claws, each of which is slidingly arranged on the drill bit seat, and a first cavity is arranged between each of the claws and the drill bit seat; a roller set comprising a first roller, a second roller and a third roller, each of which is mounted on a corresponding claw; a plurality of first oil holes, each of which is arranged in the drill bit seat and communicates with a corresponding first cavity, and the first oil holes are used for changing the volume of the first cavity by flowing hydraulic oil into the first cavity; the claws are used for sliding the first roller, the second roller and the third roller away from the drill bit seat by increasing the volume of the first cavity; a limiting rod is fixed on the claw, and the limiting rod is inserted into the drill bit seat; a second cavity is arranged on the top of the drill bit seat, the limiting rod extends into the second cavity, a positioning disc is arranged on the end of the limiting rod away from the claw, the positioning disc slidingly cooperates with the second cavity, a second oil hole is arranged on the drill bit seat and communicates with the second cavity, and the second oil hole is used for flowing hydraulic oil into the second cavity to slide the first roller, the second roller and the third roller towards the drill bit seat by a certain distance; an installation disc is arranged on the top of the drill bit seat, the limiting rod extends through the installation disc, and the installation disc, the limiting rod, the positioning disc and the drill bit seat surround the second cavity; the number of the first oil holes and the second oil holes is three, a first oil pump communicates with the first oil holes, a second oil pump communicates with the second oil holes, and the first oil pump and the second oil pump are used for positioning the first roller, the second roller and the third roller at a specific position of the drill bit seat; a reversing block is rotatably arranged in the drill bit seat, a first communication hole and a second communication hole are arranged in the reversing block, the first communication hole is used for communicating the first oil hole with the first oil pump, the second communication hole is used for communicating the second oil hole with the second oil pump, and the reversing block is used for plugging the corresponding first oil hole and second oil hole.

2. The multi-functional high-efficiency roller cone drill bit of claim 1, wherein, The hardness of the first roller is greater than that of the second roller and the third roller, the specific pressure of the second roller is greater than that of the first roller and the third roller, and the wear resistance of the third roller is greater than that of the first roller and the second roller.

3. The multi-functional high-efficiency roller cone drill bit of claim 1, wherein, The limiting rod is integrally formed with the claw.

4. The multi-functional high-efficiency roller cone drill bit of claim 1, wherein, The installation disc is located between the first cavity and the second cavity, and the installation disc, the drill bit seat and the claw surround the first cavity.

5. The multi-functional high efficiency roller cone drill bit of claim 1 wherein, The reversing block is arranged at the end of the plurality of first oil holes and the plurality of oil holes, the drill bit seat is internally provided with a first hole and a second hole, the first hole and the second hole are respectively used for communicating the first oil pump with the first communication hole and the second oil pump with the second communication hole; a first annular groove and a second annular groove are arranged along the circumference of the reversing block, the first annular groove is used for draining the hydraulic oil discharged from the first hole to the first communication hole, and the second annular groove is used for draining the hydraulic oil discharged from the second hole to the second communication hole.

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