Double-support cone anti-jamming PDC (Polycrystalline Diamond Compact) bit

Abstract

The invention discloses a double-support cone anti-jamming PDC (polycrystalline diamond compact) drill bit, which belongs to the technical field of oil and gas drilling and production and comprises a drill bit main body, a blade main body, a double-support cone mechanism, PDC cutting teeth, first crushing teeth and second crushing teeth. During conventional drilling and complex uneven formation drilling, the double-support cone mechanism arranged between the two blades can impact, extrude and crush large rock debris blocks which are cut and crushed under the pressure action of flowback drilling fluid, so that the large rock debris blocks are crushed and flowback along with a flow channel space. The anti-jamming drill bit can effectively prevent broken large rock debris blocks from being accumulated in the flow channel to cause jamming of the drill bit, and has good anti-jamming performance.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and natural gas drilling and production, and in particular relates to a double-support cone anti-sticking PDC drill bit. Background Art

[0002] During oil drilling, due to factors such as the formation structure, the drill bit often fails to rotate normally due to the accumulation of large rock fragments in the drill bit flow channel, preventing the drill bit from drilling normally and producing footage, thereby causing drill bit pressure. Severe drill bit pressure brings huge obstacles to drilling work, increases the risk of drilling accidents, increases drilling costs, and reduces drilling efficiency. Existing anti-stuck PDC drill bits mostly use enlarged drill bit flow channels and set up a fixed mechanism to achieve the purpose of anti-stuck drill bits. However, it still cannot guarantee that the drill bit will not be stuck in complex and heterogeneous formations due to the accumulation of larger rock fragments. There are also related technologies that achieve the purpose of anti-stuck drill bits by setting up an annular mechanism and arranging rollers or cutting teeth on it to crush large rock fragments. However, due to the location of the mechanism, it cannot timely crush large rock fragments inside the flow channel. In addition, there is no crushing tooth on the side close to the flow channel, so large rock fragments may still accumulate, and there is still a high probability of drill bit sticking accidents. Summary of the Invention

[0003] The present invention aims to address the problems of the prior art by providing a dual-support cone anti-sticking PDC drill bit. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism, located between the two blades, impacts and crushes large rock fragments under the pressure of the return drilling fluid, causing them to break up and flow back through the flow channel. This effectively prevents large rock fragments from accumulating in the flow channel and causing the drill bit to stick, thus providing excellent anti-sticking performance.

[0004] The present invention is achieved through the following technical solutions: A double-support cone anti-stuck drill bit includes a drill bit body, a blade body and a double-support cone mechanism; the blade body is arranged at the upper end of the drill bit body, the upper end of the blade body is provided with PDC cutting teeth, the double-support cone mechanism is provided with a first crushing tooth and a second crushing tooth, and the double-support cone mechanism is arranged on the blade body. During conventional drilling and drilling in complex and heterogeneous formations, the double-support cone mechanism impacts and squeezes and crushes large rock cuttings blocks under the pressure of the return drilling fluid, so that the large rock cuttings blocks are broken and returned through the flow channel space on the blade body.

[0005] Preferably, the drill bit body and the blade body are integrally formed, and a male cone joint connected to an upper drill string is provided at one end of the drill bit body away from the blade body.

[0006] Preferably, the blade body includes a flow channel and a plurality of 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 body is located, and the blade is provided with PDC cutting teeth.

[0007] Preferably, the double-supported gear mechanism includes a gear, a palm, a bearing and a bearing ball, the bearing ball is injected into the closed ring groove formed by the first ball ring groove and the second ball ring groove through the ball injection hole to form a bearing pair connection, the bearing is fixedly connected to the palm through the bearing mounting shaft and the bearing seat hole on the palm, the first crushing teeth are evenly arranged circumferentially on the gear, and the second crushing teeth are installed on the palm bottom side of the palm; the double-supported gear mechanism is fixedly installed between two adjacent blades by welding the palm mounting surface of the palm.

[0008] Preferably, the blade body includes a flow channel and multiple blades, radial grooves are relatively provided on the forward and reverse sides of the 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 body is located, and PDC cutting teeth are provided on the blades.

[0009] Preferably, the double-supported gear mechanism includes a gear, a palm, a bearing and a bearing ball, the bearing ball is injected into the closed ring groove formed by the first ball ring groove and the second ball ring groove through the ball injection hole to form a bearing pair connection, the bearing is fixedly connected to the palm through the bearing mounting shaft and the bearing seat hole on the palm, the first crushing teeth are evenly arranged circumferentially on the gear, the second crushing teeth are installed on the palm bottom side of the palm, and the palm also includes a palm mounting surface; the palm mounting surface has a mounting portion; the double-supported gear mechanism is fixedly installed between two adjacent blades through the mounting portion and the radial slot.

[0010] Preferably, the blade body includes a flow channel and a plurality of blades, radial grooves are relatively provided on the forward and reverse sides of the blades, radial guide holes are provided on the bottom surfaces of the radial grooves that penetrate into the interior of 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, and PDC cutting teeth are provided on the blades.

[0011] Preferably, the double-supported gear mechanism includes a gear, a tooth palm, a bearing and a bearing ball, the bearing ball is injected into the closed ring groove formed by the first ball ring groove and the second ball ring groove through the ball injection hole to form a bearing pair connection, the bearing is fixedly connected to the tooth palm through the bearing mounting shaft and the bearing seat hole on the tooth palm, the gear is circumferentially evenly arranged with a first crushing tooth, the second crushing tooth is installed on the side surface of the tooth palm at the bottom of the well, and the tooth palm also includes a tooth palm mounting surface; the tooth palm mounting surface has a mounting portion, and the mounting portion is also equipped with a radial guide rod along the radial direction of the drill bit to the center side, and the radial guide rod is equipped with a first radial Spring, both ends of the first radial spring are respectively welded to the mounting portion and the bottom surface of the radial slot, the radial guide rod fully extends to the inside of the drill bit and is relatively slidably connected to the radial guide hole, the radial guide rod moves radially relative to the radial guide hole, and a second radial spring is welded and installed on the side of the drill bit radially away from the center, the other side of the second radial spring is welded to the radial plug, and the radial plug is welded to the blade as a whole; the double-support gear mechanism is installed between two adjacent blades through the mounting portion and the radial slot, the radial plug is welded to the blade after the double-support gear mechanism is installed, and the mounting portion is slidably connected to the radial slot.

[0012] Preferably, the blade body includes a flow channel and multiple blades, and axial grooves are relatively provided on the forward and reverse sides of the 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 body is located, and PDC cutting teeth are provided on the blades.

[0013] The cam is secured to the first and second guide rails and is adapted to engage said guide rails, wherein the guide rails are secured to a first position and an second position relative to the first guide rail.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention provides a dual-support cone anti-sticking PDC drill bit. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism, located between the two blades, impacts and crushes large rock fragments under the pressure of the return drilling fluid, causing them to break up and flow back through the flow channel. This effectively prevents large rock fragments from accumulating in the flow channel and causing the drill bit to stick, demonstrating excellent anti-sticking performance.

[0015] The times that pitch is moved along the wellbore by the impact of large rock chips on the impact rock of PDC drill bit is very serious, and the local impact of impact is serious, and the local impact of impact is serious, and the local impact of impact is serious, and the local impact of impact is serious, and the local impact of Due to the presence of the first radial spring and the second radial spring, on the one hand, the double-supported gear 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, thereby extending its service life. On the other hand, the repeated energy storage and release of the first radial spring and the second radial spring cause the rock cuttings at the bottom of the well to be repeatedly impacted and crushed in the radial direction multiple times, thereby enhancing the crushing ability of large rock cuttings and helping to prevent downhole accidents such as drill bit sticking caused by the accumulation of large rock cuttings.

[0016] The frequency converter is faster and more rapid than that of the PDC drill bit, so it can be used to generate high pressure and reduce the impact of large rock chips on the drill bit. Due to the presence of the axial spring, on the one hand, the double-supported gear 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, thereby 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 axially squeeze and impact the rock cuttings at the bottom of the well, thereby enhancing the crushing ability of large rock cuttings and helping to prevent downhole accidents such as drill bit sticking caused by the accumulation of large rock cuttings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a bottom view of the drill bit during drilling operation in the present invention; Figure 3 This is an exploded view of the double-support gear mechanism of the present invention; Figure 4 It is a half-section view of the gear and a bearing view; Figure 5 Schematic diagram of the clamping type PDC drill bit body in the present invention; Figure 6 Schematic diagram of a double-support gear mechanism with a clamping mounting portion in the present invention; Figure 7 Schematic diagram of a PDC drill bit with a double-supported cone mechanism having a radial buffer function in the present invention; Figure 8 Schematic diagram of the PDC drill bit body with a double-supported cone mechanism having a radial buffer function in the present invention; Figure 9 Schematic diagram of the double-support gear mechanism with radial buffering in the present invention; Figure 10 Schematic diagram of a PDC drill bit with a double-supported cone mechanism having an axial buffer function in the present invention; Figure 11 Schematic diagram of a PDC drill bit with a double-supported cone mechanism having an axial buffer function in the present invention; Figure 12 Schematic diagram of the double-support gear mechanism with axial buffering in the present invention; Figure 13 This is a schematic diagram of the axial plug in the present invention; Among them: 100, drill bit body; 110, male taper joint; 200, blade body; 210, flow channel; 220, blade; 221, radial slot; 2210, radial guide hole; 222, axial slot; 300, double-support gear mechanism; 310, gear; 311, bearing hole; 3111, first ball ring groove; 312, ball injection hole; 313, plug; 320, tooth palm; 321, tooth palm bottom side; 322, bearing seat hole; 323, Tooth palm mounting surface; 324, mounting part; 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 DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0019] Example 1 like Figure 1-Figure 3 As shown, this embodiment provides a dual-support cone anti-sticking PDC drill bit, comprising a drill bit body 100, a blade body 200, and a dual-support cone mechanism 300. The blade body 200 is disposed at the upper end of the drill bit body 100, and is provided with a PDC cutting tooth 400. The dual-support cone mechanism 300 is provided with a first crushing tooth 500 and a second crushing tooth 600. The dual-support cone mechanism 300 is disposed on the blade body 200. During conventional drilling and drilling in complex and heterogeneous formations, the dual-support cone mechanism 300 impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the large rock cuttings to be broken and returned through the flow channel 210 on the blade body 200. The first crushing tooth 500 and the second crushing tooth 600 can be a conical tooth, a spherical tooth, a spoon-shaped tooth, or a PDC tooth.

[0020] Example 2 like Figure 1-Figure 4As shown, this embodiment provides a dual-support cone anti-sticking PDC drill bit (welded type), comprising a drill bit body 100, a blade body 200, and a dual-support cone mechanism 300. The blade body 200 is disposed at the upper end of the drill bit body 100, and is provided with PDC cutting teeth 400. The dual-support cone mechanism 300 is provided with a first crushing tooth 500 and a second crushing tooth 600. The dual-support cone mechanism 300 is disposed on the blade body 200. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism 300 impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the broken pieces to flow back through the flow channel 210 on the blade body 200. The first crushing tooth 500 and the second crushing tooth 600 can be a conical tooth, a spherical tooth, a spoon-shaped tooth, or a PDC tooth.

[0021] The drill bit body 100 and the blade body 200 are integrally formed, and a male cone joint 110 connected to an upper drill string is provided at one end of the drill bit body 100 away from the blade body 200.

[0022] The blade body 200 includes a flow channel 210 and a plurality of 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 bit body 100 is located. The blades 220 are provided with PDC cutting teeth 400 .

[0023] The dual-supported cone mechanism 300 includes a cone 310, a toothed palm 320, a bearing 330, and bearing balls 340. The bearing balls 340 are injected through a ball injection hole 312 into the closed annular groove formed by a first ball ring groove 3111 and a second ball ring groove 332, forming a bearing pair. The bearing 330 is fixedly connected to the toothed palm 320 via a bearing mounting shaft 331 and a bearing seat hole 322 on the toothed palm 320. First crushing teeth 500 are evenly arranged circumferentially on the cone 310, and second crushing teeth 600 are mounted on the bottom side surface 321 of the toothed palm 320. The dual-supported cone mechanism 300 is fixedly mounted between two adjacent blades 220 by welding the toothed palm mounting surface 323 of the toothed palm 320. The cone 310 can rotate normally without colliding or interfering with the walls of the flow channel 210.

[0024] Example 3 like Figure 6 and Figure 5As shown, this embodiment provides a dual-support cone anti-sticking PDC drill bit (slot type), comprising a drill bit body 100, a blade body 200, and a dual-support cone mechanism 300. The blade body 200 is disposed at the upper end of the drill bit body 100, and is provided with PDC cutting teeth 400. The dual-support cone mechanism 300 is provided with a first crushing tooth 500 and a second crushing tooth 600. The dual-support cone mechanism 300 is disposed on the blade body 200. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism 300 impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the broken pieces to flow back through the flow channel 210 on the blade body 200. The first crushing tooth 500 and the second crushing tooth 600 can be a conical tooth, a spherical tooth, a spoon-shaped tooth, or a PDC tooth.

[0025] The drill bit body 100 and the blade body 200 are integrally formed, and a male cone joint 110 connected to an upper drill string is provided at one end of the drill bit body 100 away from the blade body 200.

[0026] Among them, the blade body 200 includes a flow channel 210 and multiple blades 220, and radial grooves 221 are relatively arranged in the forward and reverse directions of the blade wing 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, and the blade wing 220 is provided with PDC cutting teeth 400.

[0027] Among them, the double-support gear mechanism 300 includes a gear 310, a tooth palm 320, a bearing 330 and a bearing ball 340. The bearing ball 340 is 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 tooth palm 320 through the bearing mounting shaft 331 and the bearing seat hole 322 on the tooth palm 320. The first crushing teeth 500 are evenly arranged circumferentially on the gear 310, and the second crushing teeth 600 are installed on the tooth palm bottom side 321 of the tooth palm 320. The tooth palm 320 also includes a tooth palm mounting surface 323; there is a mounting portion 324 on the tooth palm mounting surface 323; the double-support gear mechanism 300 is fixedly installed between two adjacent blades 220 through the mounting portion 324 and the radial slot 221. The gear 310 can rotate normally without colliding or interfering with the wall of the flow channel 210. The mounting portion 324 and the radial slot 221 are fixedly connected by a dovetail groove or an open groove.

[0028] The present invention provides a dual-support cone anti-sticking PDC drill bit. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism 300, located between the two blades 220, impacts and crushes large rock fragments under the pressure of the return drilling fluid, causing the fragments to flow back through the flow channel 210. This effectively prevents large rock fragments from accumulating in the flow channel 210 and causing the drill bit to stick, thus providing excellent anti-sticking performance.

[0029] Example 4 like Figure 7-Figure 9 As shown, this embodiment provides a dual-support cone anti-sticking PDC drill bit (radial buffer type), comprising a drill bit body 100, a blade body 200, and a dual-support cone mechanism 300. The blade body 200 is disposed at the upper end of the drill bit body 100, and is provided with PDC cutting teeth 400. The dual-support cone mechanism 300 is provided with a first crushing tooth 500 and a second crushing tooth 600. The dual-support cone mechanism 300 is disposed on the blade body 200. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism 300 impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the broken rock cuttings to flow back through the flow channel 210 on the blade body 200. The first crushing tooth 500 and the second crushing tooth 600 can be a conical tooth, a spherical tooth, a spoon-shaped tooth, or a PDC tooth.

[0030] The drill bit body 100 and the blade body 200 are integrally formed, and a male cone joint 110 connected to an upper drill string is provided at one end of the drill bit body 100 away from the blade body 200.

[0031] Among them, the blade body 200 includes a flow channel 210 and multiple blades 220, and radial grooves 221 are relatively arranged on the forward and reverse sides of the blade wing 220. The bottom surface of the radial groove 221 is provided with a radial guide hole 2210 that penetrates into the interior of 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, and the blade wing 220 is provided with a PDC cutting tooth 400.

[0032] Among them, the double-support gear mechanism 300 includes a gear 310, a tooth palm 320, a bearing 330 and a bearing ball 340. The bearing ball 340 is 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 tooth palm 320 through the bearing mounting shaft 331 and the bearing seat hole 322 on the tooth palm 320. The first crushing teeth 500 are evenly arranged circumferentially on the gear 310, and the second crushing teeth 600 are installed on the tooth palm bottom side surface 321 of the tooth palm 320. The tooth palm 320 also includes a tooth palm mounting surface 323; a mounting portion 324 is provided on the tooth palm mounting surface 323, and a radial guide rod 350 is also equipped on the mounting portion 324 along the radial direction of the drill bit pointing to the center side. The radial guide rod 350 is installed A first radial spring 360 is provided, its ends welded to the mounting portion 324 and the bottom surface of the radial slot 221, respectively. The radial guide rod 350 extends completely into the drill bit and is slidably connected to the radial guide hole 2210, allowing radial relative movement within the radial guide hole 2210. A second radial spring 370 is welded to the radial side of the drill bit, away from the center. The other side of the second radial spring 370 is welded to a radial plug 700, which is integrally welded to the blade 220. The dual-support cone mechanism 300 is mounted between adjacent blades 220 via the mounting portion 324 and the radial slot 221. After the dual-support cone mechanism 300 is installed, the radial plug 700 is welded to the blade 220, and the mounting portion 324 is slidably connected to the radial slot 221. The cone 310 can rotate normally without colliding or interfering with the walls of the flow channel 210.

[0033] The present invention provides a double-support cone anti-stuck PDC drill bit, a radial buffer double-support cone 310 anti-stuck PDC drill bit; since the double-support cone mechanism 300 is provided with a first radial spring 360, a second radial spring 370 and a radial guide rod 350, after being subjected to the impact force of the upward return of a large rock debris block, it moves in the opposite direction of the radial direction pointing to the center of the drill bit and compresses the second radial spring 370. The second radial spring 370 is compressed to store energy. When it is compressed to a certain extent, the cone 310 contacts the well wall, and at the same time, the first radial spring The tension of spring 360, combined with the impact of the backflow of drilling fluid from the bottom of the well, exerts a strong squeezing and crushing effect on large rock fragments, further facilitating their crushing. Once the large rock fragments are crushed, the double-supported cone mechanism 300 repeatedly reciprocates radially before the stored energy in the first and second radial springs 360 and 370 is fully released, repeatedly impacting and crushing the large rock fragments within. Large rock fragments that have not yet entered the crushing space of cone 310 continue to flow back, colliding with the first crushing teeth 500 on the tooth palm 320 and being crushed. The presence of the first and second radial springs 360 and 370 effectively protects the double-supported cone mechanism 300 from damage caused by the rapid backflow of large rock fragments from the bottom of the well, extending its service life. Furthermore, the repeated stored and released energy of the first and second radial springs 360 and 370 provides multiple radial impact crushing effects on the rock fragments from the bottom of the well, enhancing its crushing capacity and helping to prevent downhole accidents such as drill bit sticking caused by the accumulation of large rock fragments.

[0034] Example 5 like Figure 10-13 As shown, this embodiment provides a dual-support cone anti-sticking PDC drill bit (axial buffer type), comprising a drill bit body 100, a blade body 200, and a dual-support cone mechanism 300. The blade body 200 is disposed at the upper end of the drill bit body 100, and is provided with PDC cutting teeth 400. The dual-support cone mechanism 300 is provided with a first crushing tooth 500 and a second crushing tooth 600. The dual-support cone mechanism 300 is disposed on the blade body 200. During conventional drilling and drilling in complex, heterogeneous formations, the dual-support cone mechanism 300 impacts and crushes large rock cuttings under the pressure of the return drilling fluid, causing the broken pieces to flow back through the flow channel 210 on the blade body 200. The first crushing tooth 500 and the second crushing tooth 600 can be a conical tooth, a spherical tooth, a spoon-shaped tooth, or a PDC tooth.

[0035] The drill bit body 100 and the blade body 200 are integrally formed, and a male cone joint 110 connected to an upper drill string is provided at one end of the drill bit body 100 away from the blade body 200.

[0036] Among them, the blade body 200 includes a flow channel 210 and multiple blades 220, and the blades 220 are provided with axial grooves 222 in the forward and reverse 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, and the blades 220 are provided with PDC cutting teeth 400.

[0037] The double-supported gear mechanism 300 includes a gear 310, a tooth palm 320, a bearing 330 and a bearing ball 340. The bearing ball 340 is 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 tooth palm 320 through the bearing mounting shaft 331 and the bearing seat hole 322 on the tooth palm 320. The first crushing teeth 500 are evenly arranged circumferentially on the gear 310. The second crushing teeth 600 are installed on the tooth palm bottom side surface 321 of the tooth palm 320. The tooth palm 320 also includes a tooth palm mounting surface 323; the tooth palm mounting surface 323 is fixedly connected to the tooth palm 320. The double-supported cone mechanism 300 is mounted between two adjacent blades 220 via the mounting portion 324 and the axial retaining groove 222. The axial retaining groove 222 is welded to the blade 220 after the double-supported cone mechanism 300 is installed, and the mounting portion 324 is slidably connected to the axial retaining groove 222. The cone 310 can rotate normally without colliding or interfering with the wall of the flow channel 210.

[0038] The present invention provides a double-supported cone anti-stuck drill bit, an axially buffered double-supported cone 310 anti-stuck drill bit; since the double-supported cone mechanism 300 is provided with an axial spring 380 and an axial guide rod 390, after being subjected to the impact force of the upward return of large rock cuttings, it moves in the axial direction back to the bottom of the well and compresses the axial spring 380. The axial spring 380 is compressed to store energy, and when it is compressed to a certain extent, it suddenly releases the energy to generate a strong rebound force. At the same time, coupled with the liquid pressure of the return drilling fluid, the large rock cuttings are subjected to strong forces in two opposite directions, resulting in greater extrusion and impact crushing of the large rock cuttings, which is more conducive to the crushing of the large rock cuttings. The large rock cuttings that have not entered the crushing space of the cone 310 continue to flow back and will collide with the first crushing tooth 500 on the tooth palm 320 and be crushed. Due to the presence of the axial spring 380, on the one hand, the double-support gear mechanism 300 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, thereby extending its service life. On the other hand, the repeated energy storage and release of the axial spring 380, combined with the liquid pressure of the return drilling fluid, repeatedly axially squeezes and impacts the rock cuttings at the bottom of the well for multiple times, thereby enhancing the crushing ability of large rock cuttings and helping to prevent downhole accidents such as drill bit sticking caused by the accumulation of large rock cuttings.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A double-support cone anti-sticking PDC drill bit, characterized by: The drill bit comprises a drill body (100), a blade body (200) and a double-supported gear mechanism (300); the blade body (200) is arranged at the upper end of the drill bit body (100); a PDC cutting tooth (400) is arranged at the upper end of the blade body (200); a first crushing tooth (500) and a second crushing tooth (600) are arranged on the double-supported gear mechanism (300); the double-supported gear mechanism (300) is arranged on the blade body (200); during conventional drilling and drilling in complex and heterogeneous formations, the double-supported gear mechanism (300) impacts and squeezes and crushes large rock cuttings under the pressure of the return drilling fluid, so that the large rock cuttings are broken and returned through the flow channel (210) space on the blade body (200).

2. The double-support cone anti-sticking PDC drill bit according to claim 1, characterized in that: The drill bit body (100) and the blade body (200) are integrally formed, and a male cone joint (110) connected to an upper drill string is provided at one end of the drill bit body (100) away from the blade body (200).

3. The double-support cone anti-sticking PDC drill bit according to claim 2, characterized in that: The blade body (200) comprises a flow channel (210) and a plurality of 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 bit body (100) is located; and the blades (220) are provided with PDC cutting teeth (400).

4. The double-support cone anti-sticking PDC drill bit according to claim 3, characterized in that: The double-supported gear mechanism (300) comprises a gear (310), a tooth palm (320), a bearing (330) and a bearing ball (340). The bearing ball (340) is injected into a closed ring groove formed by a first ball ring groove (3111) and a second ball ring groove (332) through a ball injection hole (312) to form a bearing pair connection. The bearing (330) is fixedly connected to the tooth palm (320) through a bearing mounting shaft (331) and a bearing seat hole (322) on the tooth palm (320). First crushing teeth (500) are evenly arranged circumferentially on the gear (310), and second crushing teeth (600) are installed on the tooth palm bottom side surface (321) of the tooth palm (320). The double-supported gear mechanism (300) is fixedly installed between two adjacent blades (220) by welding the tooth palm mounting surface (323) of the tooth palm (320).

5. The double-support cone anti-sticking PDC drill bit according to claim 2, characterized in that: The blade body (200) comprises a flow channel (210) and a plurality of blades (220); radial slots (221) are provided on the forward and rearward sides of the 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 bit body (100) is located; and PDC cutting teeth (400) are provided on the blades (220).

6. The double-support cone anti-sticking PDC drill bit according to claim 5, characterized in that: The double-supported gear mechanism (300) comprises a gear (310), a tooth palm (320), a bearing (330) and a bearing ball (340). The bearing ball (340) is injected into a closed ring groove formed by a first ball ring groove (3111) and a second ball ring groove (332) through a ball injection hole (312) to form a bearing pair connection. The bearing (330) is fixed to the tooth palm (320) through a bearing mounting shaft (331) and a bearing seat hole (322) on the tooth palm (320). The first crushing teeth (500) are evenly arranged circumferentially on the cone (310), and the second crushing teeth (600) are installed on the bottom side (321) of the cone (320). The cone (320) further includes a cone mounting surface (323); a mounting portion (324) is provided on the cone mounting surface (323); and the double-support cone mechanism (300) is fixedly installed between two adjacent blades (220) via the mounting portion (324) and the radial slot (221).

7. The double-support cone anti-sticking PDC drill bit according to claim 2, characterized in that: The blade body (200) comprises a flow channel (210) and a plurality of blades (220); radial slots (221) are provided opposite to each other in the forward and reverse directions of the blades (220); radial guide holes (2210) are provided on the bottom surfaces of the radial slots (221) and penetrate into the interior of 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; and PDC cutting teeth (400) are provided on the blades (220).

8. The double-support cone anti-sticking PDC drill bit according to claim 7, characterized in that: The double-supported gear mechanism (300) comprises a gear (310), a tooth palm (320), a bearing (330) and a bearing ball (340). The bearing ball (340) is injected into a closed ring groove formed by a first ball ring groove (3111) and a second ball ring groove (332) through a ball injection hole (312) to form a bearing pair connection. The bearing (330) is connected to the tooth palm (320) through a bearing mounting shaft (331) and a bearing seat hole (322) on the tooth palm (320). ) is fixedly connected, the first crushing teeth (500) are evenly arranged circumferentially on the cone (310), and the second crushing teeth (600) are installed on the bottom side (321) of the cone (320). The cone (320) further includes a cone mounting surface (323); a mounting portion (324) is provided on the cone mounting surface (323), and a radial guide rod (350) is also installed on the mounting portion (324) along the radial direction of the drill bit pointing to the center. A first radial spring (360) is installed on the radial guide rod (350), and the two ends of the first radial spring (360) are respectively welded to the mounting portion (324) and the bottom surface of the radial groove (221). The radial guide rod (350) completely extends into the interior of the drill bit and is relatively slidably connected to the radial guide hole (2210). The radial guide rod (350) moves radially relative to the radial guide hole (2210), and a second radial spring (370) is welded and installed on the side of the drill bit facing away from the center. The other side of the spring (370) is welded to the radial plug (700), and the radial plug (700) is integrally welded to the blade (220); the double-supported toothed wheel mechanism (300) is installed between two adjacent blades (220) through the mounting portion (324) and the radial retaining groove (221); the radial plug (700) is welded to the blade (220) after the double-supported toothed wheel mechanism (300) is installed, and the mounting portion (324) is slidably connected to the radial retaining groove (221).

9. The double-support cone anti-sticking PDC drill bit according to claim 2, characterized in that: The blade body (200) comprises a flow channel (210) and a plurality of blades (220); axial slots (222) are provided on the forward and rearward sides of the 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 bit body (100) is located; and PDC cutting teeth (400) are provided on the blades (220).

10. The double-support cone anti-sticking PDC drill bit according to claim 9, characterized in that: The double-supported gear mechanism (300) includes a gear (310), a tooth palm (320), a bearing (330) and a bearing ball (340). The bearing ball (340) is injected into a closed ring groove formed by a first ball ring groove (3111) and a second ball ring groove (332) through a ball injection hole (312) to form a bearing pair connection. The bearing (330) is fixedly connected to the tooth palm (320) through a bearing mounting shaft (331) and a bearing seat hole (322) on the tooth palm (320). First crushing teeth (500) are evenly arranged circumferentially on the gear (310). Second crushing teeth (600) are installed on the tooth palm bottom side surface (321) of the tooth palm (320). The tooth palm (320) also includes a tooth palm mounting surface (323); the tooth palm mounting surface (323) is fixedly connected to the tooth palm (320). A mounting portion (324) is provided, and an axial guide rod (390) is further provided on the side of the mounting portion (324) facing away from the well bottom. An axial spring (380) is installed on the axial guide rod (390), and the axial spring (380) is restricted between the mounting portion (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-supported gear mechanism (300) is installed between two adjacent blades (220) through the mounting portion (324) and the axial clamping groove (222). The axial plug (800) is welded to the blade (220) after the double-supported gear mechanism (300) is installed, and the mounting portion (324) is slidably connected to the axial clamping groove (222).

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