A drill bit with a roller cone anti-jamming mechanism in the flow channel

Abstract

This utility model discloses a drill bit with a roller cone anti-sticking mechanism in the flow channel, belonging to the field of oil and gas drilling and production technology. It includes a drill bit body, a cutter wing body, a double-support roller cone mechanism, PDC cutting teeth, a first breaking tooth, and a second breaking tooth. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism located between the two cutter wings can impact and break large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel. This utility model effectively prevents large rock cuttings from accumulating in the flow channel and causing the drill bit to stick, exhibiting excellent anti-sticking performance.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas drilling and production technology, specifically relating to a drill bit with a roller cone anti-jamming mechanism in the flow channel. Background Technology

[0002] During oil drilling, due to factors such as formation structure, large rock cuttings often accumulate in the drill bit's flow channels, preventing the drill bit from rotating normally and thus hindering drilling progress. This results in drill bit sticking, which significantly obstructs drilling operations, increases the risk of drilling accidents, raises drilling costs, and reduces drilling efficiency. Existing anti-sticking PDC drill bits often use enlarged flow channels and fixed mechanisms to prevent sticking. However, this still cannot guarantee that even larger rock cuttings won't accumulate in complex and heterogeneous formations. Other technologies use annular mechanisms with rollers or cutting teeth to break up large rock cuttings, but these mechanisms are not positioned to break up large rock cuttings effectively within the flow channels. Furthermore, the lack of breaking teeth near the flow channel allows for further accumulation of large rock cuttings, increasing the likelihood of drill bit sticking. Utility Model Content

[0003] The purpose of this invention is to solve the problems of existing technologies and provide a drill bit with a roller cone anti-sticking mechanism in the flow channel. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism located between the two blades can impact and break large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break into fragments and flow back through the flow channel. This invention effectively prevents large rock cuttings from accumulating in the flow channel and causing the drill bit to stick, exhibiting excellent anti-sticking performance.

[0004] This utility model is achieved through the following technical solution:

[0005] A drill bit with a roller cone anti-sticking mechanism in its flow channel includes a drill bit body, a cutter wing body, and a double-support roller cone mechanism. The cutter wing body is located at the upper end of the drill bit body, and the upper end of the cutter wing body is provided with PDC cutting teeth. The double-support roller cone mechanism is provided with a first breaking tooth and a second breaking tooth. The double-support roller cone mechanism is located on the cutter wing body. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism impacts and breaks large rock cuttings under the pressure of the return drilling fluid, causing the large rock cuttings to break and return through the flow channel space on the cutter wing body.

[0006] Preferably, the drill bit body and the cutter wing body are integrally formed, and the end of the drill bit body away from the cutter wing body is provided with a male cone joint that connects to the upper drill string.

[0007] Preferably, the blade body includes a flow channel and multiple blades, the diameter of the rotating body where the flow channel is located is smaller than the diameter of the rotating body where the drill bit body is located, and the blades are provided with PDC cutting teeth.

[0008] Preferably, the dual-support roller mechanism includes rollers, roller plates, bearings, and bearing balls. The bearing balls are injected through ball injection holes into a closed annular groove formed by the first and second ball annular grooves to form a bearing pair connection. The bearings are fixedly connected to the roller plates through bearing mounting shafts and bearing seat holes on the roller plates. The rollers have first breaking teeth evenly arranged circumferentially, and the roller plates have second breaking teeth installed on the bottom side of the roller plates. The dual-support roller mechanism is fixedly installed between two adjacent blades by welding through the roller plate mounting surface.

[0009] Preferably, the blade body includes a flow channel and multiple blades, the blades are provided with radial grooves facing each other in the front and back directions, the diameter of the rotating body where the flow channel is located is smaller than the diameter of the rotating body where the drill bit body is located, and the blades are provided with PDC cutting teeth.

[0010] Preferably, the dual-support roller mechanism includes rollers, a roller plate, a bearing, and bearing balls. The bearing balls are injected through a ball injection hole into a closed annular groove formed by a first ball ring groove and a second ball ring groove to form a bearing pair connection. The bearing is fixedly connected to the roller plate through a bearing mounting shaft and a bearing seat hole on the roller plate. The rollers have first breaking teeth evenly arranged circumferentially. The roller plate has second breaking teeth installed on the bottom side of the roller plate. The roller plate also includes a roller plate mounting surface. The roller plate mounting surface has a mounting part. The dual-support roller mechanism is fixedly installed between two adjacent blades through the mounting part and a radial groove.

[0011] Preferably, the blade body includes a flow channel and multiple blades. The blades are provided with radial grooves facing each other in the front and back directions. The bottom surface of the radial groove is provided with a radial guide hole that penetrates into the drill bit. The diameter of the rotating body where the flow channel is located is smaller than the diameter of the rotating body where the drill bit body is located. The blades are provided with PDC cutting teeth.

[0012] Preferably, the dual-support roller cone mechanism includes roller cones, a die, bearings, and bearing balls. The bearing balls are injected through a ball injection hole into a closed annular groove formed by a first ball ring groove and a second ball ring groove to form a bearing pair connection. The bearing is fixedly connected to the die through a bearing mounting shaft and a bearing seat hole on the die. The roller cone has first breaking teeth evenly arranged circumferentially. The die has second breaking teeth installed on the bottom side of the die. The die also includes a die mounting surface. The die mounting surface has a mounting part, and a radial guide rod is also mounted on the mounting part along the radial direction of the drill bit towards the center. A first radial... The first radial spring has its two ends welded to the bottom surfaces of the mounting part and the radial groove, respectively. The radial guide rod extends completely into the drill bit and is slidably connected to the radial guide hole. The radial guide rod moves radially relative to the radial guide hole. A second radial spring is welded and installed on the side of the drill bit facing away from the center. The other side of the second radial spring is welded to the radial plug. The radial plug is integrally welded to the cutter wing. The double-support roller cone mechanism is installed between two adjacent cutter wings through the mounting part and the radial groove. The radial plug is welded to the cutter wing after the double-support roller cone mechanism is installed, and the mounting part is slidably connected to the radial groove.

[0013] Preferably, the blade body includes a flow channel and multiple blades, the blades are provided with axial grooves facing each other in the front and back directions, the diameter of the rotating body where the flow channel is located is smaller than the diameter of the rotating body where the drill bit body is located, and the blades are provided with PDC cutting teeth.

[0014] Preferably, the dual-support roller mechanism includes rollers, a roller plate, a bearing, and bearing balls. The bearing balls are injected into a closed annular groove formed by the first and second ball annular grooves through a ball injection hole to form a bearing pair connection. The bearing is fixedly connected to the roller plate through a bearing mounting shaft and a bearing seat hole on the roller plate. The rollers have first breaking teeth evenly arranged circumferentially. The roller plate has second breaking teeth installed on the bottom side of the roller plate. The roller plate also includes a roller plate mounting surface. The roller plate mounting surface has a mounting part. An axial guide rod is also mounted on the side of the mounting part facing away from the bottom of the well. An axial spring is installed on the axial guide rod, and the axial spring is restricted between the mounting part and the axial plug by an axial plug. The axial guide rod moves axially relative to the roller plate in the axial guide hole of the axial plug. The dual-support roller mechanism is installed between two adjacent cutter wings through the mounting part and the axial groove. The axial plug is welded to the cutter wing after the dual-support roller mechanism is installed, and the mounting part and the axial groove are slidably connected.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] I. This utility model provides a drill bit with a roller cone anti-sticking mechanism in the flow channel. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism located between the two blades can impact and break large rock cuttings under the pressure of the backflow drilling fluid, causing the large rock cuttings to break and flow back through the flow channel. This utility model effectively prevents large rock cuttings from accumulating in the flow channel and causing the drill bit to stick, exhibiting excellent anti-sticking performance.

[0017] II. This utility model provides a drill bit with a roller cone anti-sticking mechanism in the flow channel, a radial buffer type double-support roller cone anti-sticking PDC drill bit; because the double-support roller cone mechanism is equipped with a first radial spring, a second radial spring and a radial guide rod, after being impacted by the upward backflow of large rock cuttings, it moves in the opposite direction of the radial direction of the drill bit towards the center and compresses the second radial spring. The second radial spring is compressed and stores energy. When it is compressed to a certain extent, the roller cone contacts the well wall, and at the same time the first radial spring is stretched. Combined with the backflow impact force of the drilling fluid at the bottom of the well, at this time, a strong squeezing and crushing effect is generated on the large rock cuttings, which is more conducive to the crushing of large rock cuttings. After the large rock cuttings are crushed, the double-support roller cone mechanism repeatedly moves back and forth in the radial direction before the energy stored in the first and second radial springs is completely released, and repeatedly impacts and crushes the large rock cuttings in the radial direction. The large rock cuttings that have not entered the crushing space of the roller cone continue to be backflowed and will collide with the first crushing tooth on the roller cone and be crushed. Due to the presence of the first and second radial springs, on the one hand, the double-support roller mechanism is effectively protected from being damaged by the impact of large rock cuttings at the bottom of the well due to the rapid return speed, thus extending its service life. On the other hand, the repeated energy storage and release of the first and second radial springs repeatedly impact and crush the rock cuttings at the bottom of the well in a radial manner, enhancing the crushing ability of large rock cuttings and helping to prevent downhole accidents such as drill bit jamming caused by the accumulation of large rock cuttings.

[0018] III. This utility model provides a drill bit with a roller cone anti-sticking mechanism in the flow channel, an axial buffer type double support roller cone anti-sticking PDC drill bit; because the double support roller cone mechanism is equipped with an axial spring and an axial guide rod, after being impacted by the upward backflow of large rock cuttings, it moves in the axial direction away from the bottom of the well and compresses the axial spring. The axial spring stores energy during compression, and when it is compressed to a certain extent, it suddenly releases energy to generate a strong rebound force. At the same time, with the hydraulic pressure of the backflow drilling fluid, the large rock cuttings are subjected to strong forces in two opposite directions, which creates greater compression and impact on the large rock cuttings, making it more conducive to the crushing of large rock cuttings. Large rock cuttings that have not entered the roller cone crushing space continue to be backflowed and will collide with the first crushing tooth on the roller cone and be crushed. The presence of the axial spring effectively protects the double-support roller cone mechanism from being damaged by large rock cuttings at the bottom of the well due to their rapid return speed, thus extending its service life. On the other hand, the repeated energy storage and release of the axial spring, combined with the hydraulic pressure of the return drilling fluid, repeatedly compresses and impacts the rock cuttings at the bottom of the well, enhancing the ability to break up large rock cuttings and helping to prevent downhole accidents such as drill bit jamming caused by the accumulation of large rock cuttings. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a top view of the drill bit during drilling operations in this utility model;

[0021] Figure 3 This is an exploded view of the double-support roller mechanism in this utility model;

[0022] Figure 4 This is a half-sectional view of the roller and a bearing view;

[0023] Figure 5 This is a schematic diagram of the mounting PDC drill bit body in this utility model;

[0024] Figure 6 This is a schematic diagram of the double-support toothed wheel mechanism with a snap-fit ​​mounting part in this utility model;

[0025] Figure 7 This is a schematic diagram of a PDC drill bit with radial buffer function based on a double-support roller cone mechanism in this utility model;

[0026] Figure 8 This is a schematic diagram of the PDC drill bit body with radial buffer function in the double-support roller cone mechanism of this utility model;

[0027] Figure 9 This is a schematic diagram of the radial buffer double-support roller mechanism in this utility model;

[0028] Figure 10This is a schematic diagram of a PDC drill bit with axial buffer function using a double-support roller cone mechanism in this utility model;

[0029] Figure 11 This is a schematic diagram of a PDC drill bit with axial buffer function using a double-support roller cone mechanism in this utility model;

[0030] Figure 12 This is a schematic diagram of the double-supported roller mechanism for axial buffering in this utility model;

[0031] Figure 13 This is a schematic diagram of the axial plug of this utility model;

[0032] The components are as follows: 100, drill bit body; 110, male tapered connector; 200, cutter wing body; 210, flow channel; 220, cutter wing; 221, radial groove; 2210, radial guide hole; 222, axial groove; 300, double-support roller cone mechanism; 310, roller cone; 311, bearing hole; 3111, first ball ring groove; 312, ball injection hole; 313, plug head; 320, drill bit; 321, drill bit bottom side; 322, bearing seat hole; 323. 324. Mounting surface; 330. Bearing; 331. Bearing mounting shaft; 332. Second ball ring groove; 340. Bearing ball; 350. Radial guide rod; 360. First radial spring; 370. Second radial spring; 380. Axial spring; 390. Axial guide rod; 400. PDC cutting tooth; 500. First crushing tooth; 600. Second crushing tooth; 700. Radial plug; 800. Axial plug; 810. Axial guide hole. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0034] Example 1

[0035] like Figures 1-3 As shown, this embodiment provides a drill bit with a roller cone anti-sticking mechanism in the flow channel, including a drill bit body 100, a cutter wing body 200, and a double-support roller cone mechanism 300. The cutter wing body 200 is located at the upper end of the drill bit body 100, and a PDC cutting tooth 400 is provided at the upper end of the cutter wing body 200. The double-support roller cone mechanism 300 is provided with a first breaking tooth 500 and a second breaking tooth 600. The double-support roller cone mechanism 300 is located on the cutter wing body 200. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism 300 impacts and breaks large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210 space on the cutter wing body 200. The first breaking tooth 500 and the second breaking tooth 600 are conical teeth, spherical teeth, spoon-shaped teeth, or PDC teeth.

[0036] Example 2

[0037] like Figures 1-4 As shown, this embodiment provides a drill bit (welded type) with a roller cone anti-sticking mechanism in the flow channel, including a drill bit body 100, a cutter wing body 200, and a double-support roller cone mechanism 300. The cutter wing body 200 is located at the upper end of the drill bit body 100, and a PDC cutting tooth 400 is provided at the upper end of the cutter wing body 200. The double-support roller cone mechanism 300 is provided with a first breaking tooth 500 and a second breaking tooth 600. The double-support roller cone mechanism 300 is located on the cutter wing body 200. During conventional drilling and drilling in complex and heterogeneous formations, the double-support roller cone mechanism 300 impacts and breaks large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210 space on the cutter wing body 200. The first breaking tooth 500 and the second breaking tooth 600 are conical teeth, spherical teeth, spoon-shaped teeth, or PDC teeth.

[0038] The drill bit body 100 and the cutter wing body 200 are integrally formed, and the drill bit body 100 is provided with a male cone joint 110 connected to the upper drill string at the end away from the cutter wing body 200.

[0039] The cutter body 200 includes a flow channel 210 and multiple cutter wings 220. The diameter of the rotating body where the flow channel 210 is located is smaller than the diameter of the rotating body where the drill bit body 100 is located. The cutter wings 220 are provided with PDC cutting teeth 400.

[0040] The dual-support roller mechanism 300 includes rollers 310, a toothed blade 320, a bearing 330, and bearing balls 340. The bearing balls 340 are injected through a ball injection hole 312 into a closed annular groove formed by a first ball annular groove 3111 and a second ball annular groove 332 to form a bearing pair connection. The bearing 330 is fixedly connected to the toothed blade 320 through a bearing mounting shaft 331 and a bearing seat hole 322 on the toothed blade 320. The rollers 310 have first breaking teeth 500 evenly arranged circumferentially, and the toothed blade 320 has second breaking teeth 600 installed on the toothed blade well bottom side 321. The dual-support roller mechanism 300 is welded and fixedly installed between two adjacent blades 220 through the toothed blade mounting surface 323 of the toothed blade 320. The rollers 310 can rotate normally without colliding or interfering with the wall of the flow channel 210.

[0041] Example 3

[0042] like Figure 6 and Figure 5As shown, this embodiment provides a drill bit (slotted type) with a roller cone anti-sticking mechanism in the flow channel, including a drill bit body 100, a cutter wing body 200, and a double-support roller cone mechanism 300. The cutter wing body 200 is located at the upper end of the drill bit body 100, and a PDC cutting tooth 400 is provided at the upper end of the cutter wing body 200. The double-support roller cone mechanism 300 is provided with a first breaking tooth 500 and a second breaking tooth 600. The double-support roller cone mechanism 300 is located on the cutter wing body 200. During conventional drilling and drilling in complex heterogeneous formations, the double-support roller cone mechanism 300 impacts and breaks large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210 space on the cutter wing body 200. The first breaking tooth 500 and the second breaking tooth 600 are conical teeth, spherical teeth, spoon-shaped teeth, or PDC teeth.

[0043] The drill bit body 100 and the cutter wing body 200 are integrally formed, and the drill bit body 100 is provided with a male cone joint 110 connected to the upper drill string at the end away from the cutter wing body 200.

[0044] The cutter body 200 includes a flow channel 210 and multiple cutter wings 220. The cutter wings 220 are provided with radial grooves 221 facing each other in the front and back directions. The diameter of the rotating body where the flow channel 210 is located is smaller than the diameter of the rotating body where the drill bit body 100 is located. The cutter wings 220 are provided with PDC cutting teeth 400.

[0045] The dual-support roller mechanism 300 includes rollers 310, a toothed blade 320, a bearing 330, and bearing balls 340. The bearing balls 340 are injected into a closed annular groove formed by a first ball annular groove 3111 and a second ball annular groove 332 through a ball injection hole 312 to form a bearing pair connection. The bearing 330 is fixedly connected to the toothed blade 320 through a bearing mounting shaft 331 and a bearing seat hole 322 on the toothed blade 320. The rollers 310 have first breaking teeth 500 evenly arranged circumferentially. The toothed blade 320 has second breaking teeth 600 installed on the toothed blade well bottom side 321. The toothed blade 320 also includes a toothed blade mounting surface 323. The toothed blade mounting surface 323 has a mounting part 324. The dual-support roller mechanism 300 is fixedly installed between two adjacent blades 220 through the mounting part 324 and the radial groove 221. The toothed wheel 310 can rotate normally without colliding or interfering with the wall of the flow channel 210. The mounting part 324 and the radial groove 221 are fixedly connected by a dovetail groove or an open groove, etc.

[0046] This invention provides a drill bit with a roller cone anti-sticking mechanism in the flow channel. During conventional drilling and drilling in complex, heterogeneous formations, the double-support roller cone mechanism 300, located between the two blades 220, can impact and break large rock cuttings under the pressure of the backflow drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210. This invention effectively prevents large, broken rock cuttings from accumulating in the flow channel 210 and causing the drill bit to stick, exhibiting excellent anti-sticking performance.

[0047] Example 4

[0048] like Figures 7-9 As shown, this embodiment provides a drill bit (radial buffer type) with a roller cone anti-sticking mechanism in the flow channel, including a drill bit body 100, a cutter wing body 200, and a double-support roller cone mechanism 300. The cutter wing body 200 is located at the upper end of the drill bit body 100, and a PDC cutting tooth 400 is provided at the upper end of the cutter wing body 200. The double-support roller cone mechanism 300 is provided with a first breaking tooth 500 and a second breaking tooth 600. The double-support roller cone mechanism 300 is located on the cutter wing body 200. During conventional drilling and drilling in complex heterogeneous formations, the double-support roller cone mechanism 300 impacts and breaks large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210 space on the cutter wing body 200. The first breaking tooth 500 and the second breaking tooth 600 are conical teeth, spherical teeth, spoon-shaped teeth, or PDC teeth.

[0049] The drill bit body 100 and the cutter wing body 200 are integrally formed, and the drill bit body 100 is provided with a male cone joint 110 connected to the upper drill string at the end away from the cutter wing body 200.

[0050] The cutter body 200 includes a flow channel 210 and multiple cutter wings 220. The cutter wings 220 are provided with radial grooves 221 facing each other in the front and back directions. The bottom surface of the radial grooves 221 is provided with radial guide holes 2210 that penetrate into the drill bit. The diameter of the rotating body where the flow channel 210 is located is smaller than the diameter of the rotating body where the drill bit body 100 is located. The cutter wings 220 are provided with PDC cutting teeth 400.

[0051] The dual-support roller cone mechanism 300 includes a roller cone 310, a toothed plate 320, a bearing 330, and bearing balls 340. The bearing balls 340 are injected through a ball injection hole 312 into a closed annular groove formed by a first ball annular groove 3111 and a second ball annular groove 332 to form a bearing pair connection. The bearing 330 is fixedly connected to the toothed plate 320 through a bearing mounting shaft 331 and a bearing seat hole 322 on the toothed plate 320. The roller cone 310 has first breaking teeth 500 evenly arranged circumferentially. The toothed plate 320 has second breaking teeth 600 installed on the toothed plate bottom side 321. The toothed plate 320 also includes a toothed plate mounting surface 323. The toothed plate mounting surface 323 has a mounting part 324. The mounting part 324 is also equipped with a radial guide rod 350 on the radially center side of the drill bit. The radial guide rod 350 is mounted with... A first radial spring 360 is provided, with its two ends welded to the bottom surfaces of the mounting portion 324 and the radial groove 221, respectively. A radial guide rod 350 extends completely into the drill bit and is slidably connected to the radial guide hole 2210. The radial guide rod 350 moves radially relative to the radial guide hole 2210. A second radial spring 370 is welded to the side of the drill bit facing away from the center, and the other side of the second radial spring 370 is welded to a radial plug 700. The radial plug 700 is integrally welded to the cutter wing 220. A double-support roller cone mechanism 300 is installed between two adjacent cutter wings 220 via the mounting portion 324 and the radial groove 221. The radial plug 700 is welded to the cutter wing 220 after the double-support roller cone mechanism 300 is installed, and the mounting portion 324 is slidably connected to the radial groove 221. The roller cone 310 can rotate normally without colliding or interfering with the wall of the flow channel 210.

[0052] This utility model provides a drill bit with a roller cone anti-sticking mechanism in the flow channel, a radial buffer type double-support roller cone 310 anti-sticking PDC drill bit; because the double-support roller cone mechanism 300 is equipped with a first radial spring 360, a second radial spring 370 and a radial guide rod 350, after being impacted by a large rock cuttings being ejected upwards, it moves in the opposite direction to the radial center of the drill bit and compresses the second radial spring 370. The second radial spring 370 is compressed and stores energy. When it is compressed to a certain extent, the roller cone 310 contacts the well wall, and at the same time, the first radial spring... When spring 360 is stretched, combined with the impact force of the drilling fluid flowing back from the bottom of the well, a strong squeezing and crushing effect is generated on the large rock cuttings, which is more conducive to the crushing of the large rock cuttings. After the large rock cuttings are crushed, the double-support roller cone mechanism 300 repeatedly moves back and forth radially before the energy stored in the first radial spring 360 and the second radial spring 370 is completely released, repeatedly impacting and crushing the large rock cuttings in the radial direction. The large rock cuttings that have not entered the crushing space of the roller cone 310 continue to flow back and will collide with and be crushed by the first crushing tooth 500 on the tooth 320. Due to the presence of the first radial spring 360 and the second radial spring 370, on the one hand, the double-support roller cone mechanism 300 is effectively protected from being damaged by the impact of the large rock cuttings at the bottom of the well due to the rapid flow back speed, thus extending its service life. On the other hand, the repeated energy storage and release of the first radial spring 360 and the second radial spring 370, which repeatedly impact and crush the rock cuttings at the bottom of the well in the radial direction, enhances the crushing ability of the large rock cuttings and helps to prevent downhole accidents such as drill bit jamming caused by the accumulation of large rock cuttings.

[0053] Example 5

[0054] like Figures 10-13 As shown, this embodiment provides a drill bit (axial buffer type) with a roller cone anti-sticking mechanism in the flow channel, including a drill bit body 100, a cutter wing body 200, and a double-support roller cone mechanism 300. The cutter wing body 200 is located at the upper end of the drill bit body 100, and a PDC cutting tooth 400 is provided at the upper end of the cutter wing body 200. The double-support roller cone mechanism 300 is provided with a first breaking tooth 500 and a second breaking tooth 600. The double-support roller cone mechanism 300 is located on the cutter wing body 200. During conventional drilling and drilling in complex heterogeneous formations, the double-support roller cone mechanism 300 impacts and breaks large rock cuttings under the pressure of the flowback drilling fluid, causing the large rock cuttings to break and flow back through the flow channel 210 space on the cutter wing body 200. The first breaking tooth 500 and the second breaking tooth 600 are conical teeth, spherical teeth, spoon-shaped teeth, or PDC teeth.

[0055] The drill bit body 100 and the cutter wing body 200 are integrally formed, and the drill bit body 100 is provided with a male cone joint 110 connected to the upper drill string at the end away from the cutter wing body 200.

[0056] The cutter body 200 includes a flow channel 210 and multiple cutter wings 220. The cutter wings 220 are provided with axial grooves 222 facing each other in the front and back directions. The diameter of the rotating body where the flow channel 210 is located is smaller than the diameter of the rotating body where the drill bit body 100 is located. The cutter wings 220 are provided with PDC cutting teeth 400.

[0057] The dual-support roller mechanism 300 includes a roller 310, a toothed plate 320, a bearing 330, and bearing balls 340. The bearing balls 340 are injected through a ball injection hole 312 into a closed annular groove formed by a first ball ring groove 3111 and a second ball ring groove 332 to form a bearing pair connection. The bearing 330 is fixedly connected to the toothed plate 320 through a bearing mounting shaft 331 and a bearing seat hole 322 on the toothed plate 320. The roller 310 has first breaking teeth 500 evenly arranged circumferentially. The toothed plate 320 has second breaking teeth 600 installed on the toothed plate well bottom side 321. The toothed plate 320 also includes a toothed plate mounting surface 323. The device includes an installation part 324, on the side of the installation part 324 facing away from the bottom of the well, an axial guide rod 390. An axial spring 380 is mounted on the axial guide rod 390, and the axial spring 380 is restricted between the installation part 324 and the axial plug 800 by an axial plug. The axial guide rod 390 moves axially relative to the axial guide hole 810 on the axial plug 800. The double-support roller cone mechanism 300 is installed between two adjacent cutter wings 220 via the installation part 324 and the axial groove 222. The axial plug 800 is welded to the cutter wings 220 after the double-support roller cone mechanism 300 is installed, and the installation part 324 is slidably connected to the axial groove 222. The roller cone 310 can rotate normally without colliding or interfering with the wall of the flow channel 210.

[0058] This utility model provides a drill bit with a roller cone anti-sticking mechanism in the flow channel, namely an axial buffer type double support roller cone 310 anti-sticking PDC drill bit; because the double support roller cone mechanism 300 is equipped with an axial spring 380 and an axial guide rod 390, after being impacted by the upward backflow of large rock cuttings, it moves in the axial direction away from the bottom of the well and compresses the axial spring 380. The axial spring 380 stores energy during compression, and when it is compressed to a certain extent, it suddenly releases energy to generate a strong rebound force. At the same time, with the hydraulic pressure of the backflow drilling fluid, the large rock cuttings are subjected to strong forces in two opposite directions, which creates greater compression and impact on the large rock cuttings, which is more conducive to the crushing of large rock cuttings. Large rock cuttings that have not entered the crushing space of the roller cone 310 continue to be backflowed and will collide with the first crushing tooth 500 on the tooth 320 and be crushed. The presence of the axial spring 380 effectively protects the double-support roller mechanism 300 from being damaged by the impact of large rock cuttings at the bottom of the well due to the rapid return speed, thus extending its service life. On the other hand, the repeated energy storage and release of the axial spring 380, combined with the hydraulic pressure of the return drilling fluid, repeatedly compresses and impacts the rock cuttings at the bottom of the well, enhancing the ability to break large rock cuttings and helping to prevent downhole accidents such as drill bit jamming caused by the accumulation of large rock cuttings.

[0059] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A drill bit having a flow passage with roller anti-jamming mechanism, characterized in that: The system includes a drill bit body (100), a cutter wing body (200), and a double-support roller cone mechanism (300). The cutter wing body (200) is located at the upper end of the drill bit body (100). The upper end of the cutter wing body (200) is provided with PDC cutting teeth (400). The double-support roller cone mechanism (300) is provided with a first breaking tooth (500) and a second breaking tooth (600). The double-support roller cone mechanism (300) is located on the cutter wing body (200). During conventional drilling and drilling in complex heterogeneous formations, the double-support roller cone mechanism (300) impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the large rock cuttings to break and return through the flow channel (210) on the cutter wing body (200). ​ 2. The drill bit of claim 1, wherein: The drill bit body (100) and the cutter wing body (200) are integrally formed. The drill bit body (100) is provided with a male cone joint (110) connected to the upper drill string at the end away from the cutter wing body (200).

3. The drill bit of claim 2, wherein: The blade body (200) includes a flow channel (210) and multiple blades (220). The diameter of the rotating body where the flow channel (210) is located is smaller than the diameter of the rotating body where the drill body (100) is located. PDC cutting teeth (400) are provided on the blades (220).

4. The drill bit of claim 3, wherein: The dual-support roller mechanism (300) includes rollers (310), rollers (320), bearings (330), and bearing balls (340). The bearing balls (340) are injected into the closed ring groove formed by the first ball ring groove (3111) and the second ball ring groove (332) through the ball injection hole (312) to form a bearing pair connection. The bearing (330) is fixedly connected to the rollers (320) through the bearing mounting shaft (331) and the bearing seat hole (322) on the rollers (320). The rollers (310) are evenly arranged with first breaking teeth (500) in the circumferential direction. The rollers (320) are equipped with second breaking teeth (600) on the roller bottom side (321) of the rollers (320). The dual-support roller mechanism (300) is fixedly installed between two adjacent blades (220) by welding the roller mounting surface (323) of the rollers (320).

5. The drill bit of claim 2, wherein: The blade body (200) includes a flow channel (210) and multiple blades (220). The blades (220) are provided with radial grooves (221) facing each other in the front and back directions. The diameter of the rotating body where the flow channel (210) is located is smaller than the diameter of the rotating body where the drill body (100) is located. The blades (220) are provided with PDC cutting teeth (400).

6. The drill bit of claim 5, wherein: The double-support roller mechanism (300) includes a roller (310), a toothed roller (320), a bearing (330), and bearing balls (340). The bearing balls (340) are injected through the ball injection hole (312) into the closed annular groove formed by the first ball annular groove (3111) and the second ball annular groove (332) to form a bearing pair connection. The bearing (330) is fixed to the toothed roller (320) through the bearing mounting shaft (331) and the bearing seat hole (322) on the toothed roller (320). The toothed wheel (310) is circumferentially evenly arranged with first breaking teeth (500), and the toothed wheel (320) has a second breaking tooth (600) installed on the toothed wheel bottom side (321). The toothed wheel (320) also includes a toothed wheel mounting surface (323). The toothed wheel mounting surface (323) has a mounting part (324). The double-support toothed wheel mechanism (300) is fixedly installed between two adjacent blades (220) through the mounting part (324) and the radial groove (221).

7. A drill bit with a roller cone anti-jamming mechanism in the flow channel according to claim 2, characterized in that: The blade body (200) includes a flow channel (210) and multiple blades (220). The blades (220) are provided with radial grooves (221) facing each other in the front and back directions. The bottom surface of the radial grooves (221) is provided with radial guide holes (2210) that penetrate into the drill bit. The diameter of the rotating body where the flow channel (210) is located is smaller than the diameter of the rotating body where the drill bit body (100) is located. The blades (220) are provided with PDC cutting teeth (400).

8. A drill bit with a roller cone anti-jamming mechanism in the flow channel according to claim 7, characterized in that: The double-support roller mechanism (300) includes a roller (310), a toothed wheel (320), a bearing (330), and bearing balls (340). The bearing balls (340) are injected through the ball injection hole (312) into the closed annular groove formed by the first ball annular groove (3111) and the second ball annular groove (332) to form a bearing pair connection. The bearing (330) is connected to the toothed wheel (320) through the bearing mounting shaft (331) and the bearing seat hole (322) on the toothed wheel (320). The toothed cone (310) is fixedly connected, and the first breaking teeth (500) are evenly arranged circumferentially on the toothed cone bottom side (321) of the toothed cone (320). The toothed cone (320) also includes a toothed cone mounting surface (323). The toothed cone mounting surface (323) has a mounting part (324). The mounting part (324) is also equipped with a radial guide rod (350) on the side of the drill bit pointing radially toward the center. The radial guide rod (350) is equipped with a first radial spring (360). The two ends of the first radial spring (360) are respectively welded to the bottom surface of the mounting part (324) and the radial groove (221). The radial guide rod (350) extends completely into the drill bit and slides relative to the radial guide hole (2210). The radial guide rod (350) moves radially relative to the radial guide hole (2210). A second radial spring (370) is welded and installed on the side of the drill bit facing away from the center. The radial plug (700) is welded to the other side of the spring (370), and the radial plug (700) is welded to the blade (220) as a whole; the double support gear mechanism (300) is installed between two adjacent blades (220) through the mounting part (324) and the radial groove (221). The radial plug (700) is welded to the blade (220) after the double support gear mechanism (300) is installed, and the mounting part (324) is slidably connected to the radial groove (221).

9. A drill bit with a roller cone anti-jamming mechanism in the flow channel according to claim 2, characterized in that: The blade body (200) includes a flow channel (210) and multiple blades (220). The blades (220) are provided with axial grooves (222) facing each other in the front and back directions. The diameter of the rotating body where the flow channel (210) is located is smaller than the diameter of the rotating body where the drill bit body (100) is located. The blades (220) are provided with PDC cutting teeth (400).

10. A drill bit with a roller cone anti-jamming mechanism in the flow channel according to claim 9, characterized in that: The dual-support roller mechanism (300) includes a roller (310), a toothed plate (320), a bearing (330), and bearing balls (340). The bearing balls (340) are injected through a ball injection hole (312) into a closed annular groove formed by the first ball annular groove (3111) and the second ball annular groove (332) to form a bearing pair connection. The bearing (330) is fixedly connected to the toothed plate (320) through a bearing mounting shaft (331) and a bearing seat hole (322) on the toothed plate (320). The roller (310) has first breaking teeth (500) evenly arranged circumferentially. The toothed plate (320) has second breaking teeth (600) installed on the toothed plate well bottom side (321). The toothed plate (320) also includes a toothed plate mounting surface (323). The device has an installation part (324), and an axial guide rod (390) is also mounted on the side of the installation part (324) facing away from the bottom of the well. An axial spring (380) is installed on the axial guide rod (390), and the axial spring (380) is restricted between the installation part (324) and the axial plug (800) by an axial plug (800). The axial guide rod (390) moves axially relative to the axial guide hole (810) on the axial plug (800). The double support roller mechanism (300) is installed between two adjacent cutter wings (220) through the installation part (324) and the axial groove (222). The axial plug (800) is welded to the cutter wing (220) after the double support roller mechanism (300) is installed, and the installation part (324) and the axial groove (222) are slidably connected.

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