Annular beam PDC drill bit

Abstract

The invention discloses an annular beam PDC (Polycrystalline Diamond Compact) drill bit, which relates to the field of drilling equipment and comprises a drill bit body and a plurality of blades extending from the drill bit body or fixed on the drill bit body, a plurality of cutting teeth are arranged on the blades, chip grooves are arranged between adjacent blades, water holes are arranged on the chip grooves, and an annular beam is arranged between at least two blades on the drill bit body. The two cutter wings are connected through the annular beam, the strength of the cutter wings is improved, the chip removal space of the drill bit is effectively increased, the surface of the upper end of the annular beam is an annular beam tooth distribution face, the face, close to the core area of the drill bit, of the annular beam is an annular beam inwards-concave face, and annular beam inwards-concave face water holes are formed in the annular beam inwards-concave face. The strength of the blades is improved through connection of the blades, meanwhile, the jet flow capacity of the core area of the drill bit is improved to achieve the effects of enhancing cooling of the cutting teeth and migration of rock debris, the phenomena of blade breakage and thermal abrasion of the cutting teeth are prevented, the service life of the drill bit is prolonged, and the drill bit has the capacity of drilling in different stratums.

Description

Technical Field

[0001] The invention belongs to the drilling technology fields of petroleum and natural gas, mining engineering, high temperature wells, building foundation engineering construction, geology, hydrology and the like, and particularly relates to an annular beam PDC drill bit. Background Art

[0002] The drill bit is a rock-breaking tool used to break rocks and form wellbores in drilling projects. At present, with the increasing number of oil and gas exploitation, its difficulty is also increasing. More and more wells are being developed in deep wells and ultra-deep wells. In addition to the cutting structure, the hydraulic structure on the drill bit also plays an important role in the rock-breaking efficiency and service life of the drill bit, that is, cooling the cutting teeth, cleaning the bottom of the well, transporting rock cuttings, and assisting in rock breaking. At present, the design of the hydraulic structure on the drill bit is to arrange nozzles or water holes at different positions on the drill bit body, and the drilling fluid or cooling medium in the inner flow channel is sprayed out through the nozzles or water holes to achieve the purpose of cleaning and cooling the cutting elements.

[0003] In modern fast drilling technology, the drill bit needs to have an excellent rock-breaking cutting structure, and also needs to have good hydraulic performance such as cleaning the bottom of the well, moving rock cuttings, cooling and cleaning the cutting teeth. At the same time, the blades need to have sufficient strength to maintain the blade breakage caused by vibrations caused by the formation's jamming and jumping during drilling. Conventional drill bits, whether cutting structure design or hydraulic structure design, can only be designed for specific formations. First, the corresponding drill bit is designed for soft formations to prevent the drill bit from mud packing due to excessive rock cuttings when drilling in soft formations; second, the corresponding drill bit is designed for hard formations, abrasive formations, and complex and difficult-to-drill formations such as gravel and flint formations. The main purpose is to increase the strength of the drill blades by increasing the material and blade thickness, and to prevent the cutting teeth from generating too much heat due to excessive friction during drilling, resulting in thermal wear due to failure to be cooled in time and other adverse effects.

[0004] With the continuous development of drilling, in actual drilling, not only soft or hard formations will be encountered, but also soft and hard alternating formations and complex and difficult-to-drill formations such as gravel and flint formations. Conventional drill bits cannot simultaneously meet the requirements of preventing mud packing in soft formations and preventing blade breakage and thermal wear of cutting teeth due to severe jamming and jumping in complex and difficult-to-drill formations.

[0005] For example, the Chinese patent document, authorization announcement number CN116025290B, authorization announcement date July 4, 2023, the invention name is a pressure-adaptive PDC drill bit that can solve the problem of mud packing in the drill bit and mud packing in the chip groove during operation, but there are still blade breakage and thermal wear of cutting teeth due to severe jamming and jumping in complex and difficult-to-drill formations. In order to solve the defects of the above-mentioned prior art, a ring beam PDC drill bit is proposed, which increases the blade strength by connecting the blades, and at the same time increases the jet capacity of the core area of ​​the drill bit to achieve the effect of enhancing the cooling of the cutting teeth and the movement of cuttings, so that it has the ability to drill in different formations. Summary of the invention

[0006] The present invention provides an annular beam PDC drill bit. Aiming at the current application of oil drilling drill bits in difficult-to-drill formations, the blade strength is increased by connecting the blades, and the jet capacity of the core area of ​​the drill bit is increased to achieve the effect of enhancing the cooling of the cutting teeth and the movement of rock chips, so that the drill bit has the ability to drill in different formations.

[0007] The technical solution of the present invention is as follows: A ring-beam PDC drill bit comprises a drill bit body, a plurality of blades extending from the drill bit body or fixed on the drill bit body, a plurality of cutting teeth are arranged on the blades, a chip groove is arranged between adjacent blades, a water hole in the chip groove is arranged on the chip groove, a ring-beam for improving the blade strength is arranged between at least two blades on the drill bit body, and the two blades are connected by the ring-beam, the upper end surface of the ring-beam is a ring-beam tooth surface, the side of the ring-beam close to the core area of ​​the drill bit is an inner concave surface of the ring-beam, and the inner concave surface of the ring-beam is provided with an inner concave surface water hole.

[0008] Furthermore, the annular beam cloth tooth surface is provided with annular beam cloth tooth surface cutting teeth and annular beam cloth tooth surface water holes.

[0009] Furthermore, the annular beam tooth surface is provided with annular beam tooth surface cutting teeth. The annular beam tooth surface is completely provided with annular beam tooth surface cutting teeth, which greatly improves the tooth density of the drill bit and the diamond content of the drill bit. When drilling in highly abrasive formations, the service life of the cutting teeth can be increased, thereby increasing the working life of the drill bit.

[0010] Furthermore, the annular beam tooth surface is provided with annular beam tooth surface water holes. The annular beam tooth surface water holes are all provided on the annular beam tooth surface, which increases the cooling and cleaning area of ​​the drilling fluid at the bottom of the well, greatly improves the efficiency of the bottom of the well cleaning and cuttings transportation, and effectively inhibits the occurrence of drill bit mud packing caused by cuttings accumulation. At the same time, the drilling fluid flowing out of the annular beam preferentially cools the bottom of the well rock, reduces the bottom of the well rock strength, improves the rock breaking efficiency of the cutting teeth, and can increase the rapid cooling effect of the cutting teeth when the bottom of the well temperature is high.

[0011] Furthermore, the annular beam is arranged on the shoulder of the drill bit body, and a plurality of annular beam tooth surface cutting teeth and a plurality of annular beam tooth surface water holes are arranged on the annular beam tooth surface. The cutting teeth on the shoulder of the drill bit have a large linear speed and a large cutting amount, and are the part of the drill bit most prone to wear. The annular beam is arranged on the shoulder of the drill bit body, which can greatly increase the tooth density of the shoulder cutting teeth, increase the diamond content in this area, and greatly improve the working life of the cutting teeth in this area.

[0012] Furthermore, the annular beam is arranged in the core area of ​​the drill bit body, and a number of annular beam tooth surface cutting teeth and a number of annular beam tooth surface water holes are arranged on the annular beam tooth surface. The tooth density in the core of the drill bit is sparse, and the core cutting teeth are prone to failure when drilling in complex and difficult-to-drill formations, causing the drill bit to have core hollowing. The annular beam is arranged in the core area of ​​the drill bit, which increases the tooth density of the cutting teeth in the core area, increases the diamond content in the core area, increases the service life of the cutting teeth in the core area, inhibits the occurrence of core hollowing failure and other phenomena, and greatly improves drilling efficiency.

[0013] Furthermore, the annular beam is arranged at the shoulder and the core of the drill body. A plurality of annular beam tooth surface cutting teeth and a plurality of annular beam tooth surface water holes are arranged on the annular beam tooth surface. The annular beam is arranged at the shoulder and the core of the drill body to strengthen the shoulder area with a large cutting amount (also the area with a large wear amount) and the weak core area at the same time, effectively preventing the failure of the shoulder and the core of the drill bit, and greatly improving the working life of the drill bit.

[0014] Furthermore, the tooth surface of the annular beam is lower than the tooth surface of the blade wing. After the cutting teeth on the blade wing fail, the cutting teeth on the annular beam can continue to crush rocks. At the same time, the water holes on the annular beam continuously cool the cutting teeth, which greatly reduces the occurrence of thermal wear of the cutting teeth, increases the service life of the cutting teeth, and greatly increases the working life of the drill bit.

[0015] Furthermore, the tooth surface of the annular beam and the tooth surface of the blade are at the same height, so that the diamond content of the drill bit during rotary scraping is increased, the diamond content per unit area is increased, thereby increasing the degree of rock crushing and improving the working life of the cutting teeth.

[0016] Furthermore, the PDC drill bit is a composite rotary head, including a tooth palm, a roller and roller cutting teeth. The roller cutting teeth crush rocks in an alternating manner, which is beneficial to the cooling of the cutting teeth. At the same time, the cutting teeth and water holes on the annular beam increase the cooling of the core area of ​​the composite drill bit and increase the tooth density of the drill bit cutting teeth, thereby improving the working life of the cutting teeth. The rolling of the roller drill bit reduces the torque of the drill bit, especially in directional wells, the torque reduction effect is better.

[0017] Furthermore, the composite drill bit blade tooth surface is provided with special-shaped cutting teeth and buffer teeth. The special-shaped cutting teeth are arranged behind the end cutting teeth from top to bottom along the blade tooth surface, and the buffer teeth are arranged beside the cutting teeth. The special-shaped teeth can improve the tooth bit's ability to bite into hard formations and improve the drill bit's rock breaking efficiency. The buffer teeth have a torque reduction and vibration reduction effect during the drilling process and can increase the drill bit's service life.

[0018] Furthermore, a replaceable nozzle is provided between the blade and the tooth palm of the composite drill bit. Large and small nozzles can be replaced according to the drilling parameter requirements, and the size of the water hole can be adjusted, thereby changing the hydraulic energy ejected by the nozzle, adjusting the bottom hole hydraulic injection capacity, and improving the drilling efficiency.

[0019] The beneficial effects of the present invention are as follows: 1. The drill bit structure of the present invention has blades connected by an annular beam, which greatly improves the strength of the blades. When drilling in complex and difficult-to-drill formations such as high-hardness, highly abrasive formations, soft and hard interlaced formations, gravel and flint layers, etc., it can effectively prevent the blades from breaking due to drill bit jamming and jumping caused by complex downhole working conditions, greatly improving the service life of the drill bit. Compared with the method of increasing blade thickness to improve blade strength, it can effectively increase the chip removal space of the drill bit, improve the efficiency of cuttings transportation, and avoid the accumulation of cuttings caused by too small chip removal space and untimely cuttings transportation.

[0020] 2. Water holes are set on the inner concave surface of the annular beam to strengthen the cooling of the cutting teeth in the core area, reduce the thermal wear of the cutting teeth, and at the same time improve the rapid and efficient cleaning and transportation of the cuttings in the core area, effectively inhibiting the occurrence of mud packing of the drill bit. The drilling fluid flowing out of the inner concave water holes gives priority to cooling the bottom hole rock, reducing the strength of the bottom hole rock, improving the rock breaking efficiency of the cutting teeth, and greatly improving the working life of the drill bit and drilling efficiency.

[0021] 3. Cutting teeth and water holes are set on the annular beam to improve the drill bit tooth density, increase the diamond content of the broken rock, and at the same time strengthen the shoulder with large cutting volume and weak core area. The water holes on the annular beam continuously cool the cutting teeth, greatly reducing the occurrence of thermal wear of the cutting teeth, increasing the service life of the cutting teeth, and improving the working life and drilling efficiency of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a drill bit structure provided by an embodiment of the present invention Figure 2 for Figure 1 Top view of the drill bit Figure 3 Schematic diagram of setting water holes for the inner concave surface of the ring beam Figure 4 Schematic diagram of the drill bit structure with water holes set on the tooth surface of the annular beam Figure 5 for Figure 4 Top view of the drill bit Figure 6 Schematic diagram of the drill bit structure with the tooth surfaces of the annular beam arranged as cutting teeth Figure 7 for Figure 6 Top view of the drill bit Figure 8 The inner concave surface of the ring beam is provided with water holes, and the tooth surface is provided with cutting teeth and water holes. Fig. 9 This is a schematic diagram of the structure in which the annular beam is arranged in the core area of ​​the drill bit; Fig.10 for Fig. 9 Top view of the drill bit Fig.11 Schematic diagram of the structure of the annular beam set in the shoulder area and the core area of ​​the drill bit Fig.12 Schematic diagram of drill bit structure with the tooth surface of the ring beam and the tooth surface of the blade wing at the same height Fig.13 It is a schematic diagram of the drill bit structure in which the tooth surface of the annular beam is lower than the tooth surface of the blade wing; Fig.14 Schematic diagram of the ring beam applied to the composite drill bit structure Figure markings: 1-drill bit body, 2-blade, 20-blade tooth surface, 21-cutting tooth, 22-special-shaped cutting tooth, 23-buffer tooth, 3-chip groove, 31-water hole in chip groove, 32-replaceable nozzle, 4-annular beam, 41-inner concave surface of annular beam, 411-water hole in the inner concave surface of annular beam, 42-tooth surface of annular beam, 421-tooth surface cutting tooth of annular beam, 422-tooth surface water hole of annular beam, 51-tooth palm, 52-wheel, 521-wheel cutting tooth. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the embodiments. Embodiment 1: like Figure 1-3As shown, an annular beam PDC drill bit comprises a drill bit body 1, a plurality of blades 2 extending from the drill bit body 1 or fixed on the drill bit body 1, a plurality of cutting teeth 21 are arranged on the blades 2, a chip groove 3 is arranged between adjacent blades 2, a water hole 31 in the chip groove is arranged on the chip groove 3, an annular beam 4 for improving the strength of the blade 2 is arranged between at least two blades 2 on the drill bit body 1, and the two blades 2 are connected by the annular beam 4 to prevent the blade 2 from breaking due to complex downhole working conditions when the drill bit encounters complex formations. Compared with the method of increasing the thickness of the blade 2 to improve the strength of the blade 2, the blade 2 strength is improved and the chip removal space of the drill bit is effectively increased, and the rock cuttings migration channel is improved. The upper end surface of the annular beam 4 is an annular beam tooth surface 42, and the side of the annular beam 4 close to the core area of ​​the drill bit is an annular beam inner concave surface 41. The annular beam inner concave surface water hole 411 is arranged on the annular beam inner concave surface 41, which strengthens the cooling of the cutting teeth 21 in the core area of ​​the drill bit, reduces the thermal wear of the cutting teeth 21, and can quickly clean and migrate the rock cuttings in the core area. Improve the working life of the drill bit and the drilling efficiency.

[0024] Embodiment 2: Based on the structure of Example 1, Figure 8 As shown, the annular beam tooth surface 42 is provided with annular beam tooth surface cutting teeth 421 and annular beam tooth surface water holes 422.

[0025] Embodiment 3: Based on the structure of Example 1, Figure 4-5 As shown, the annular beam tooth surface 42 is fully provided with annular beam tooth surface water holes 422. The cuttings crushed by the cutting tooth 21 eventually enter the annulus through the chip discharge groove. If the cuttings in the chip discharge groove 3 cannot be discharged smoothly, the cuttings will be blocked in the flow channel groove, and then mud bags will be generated. Especially in the process of drilling in soft formations, more cuttings will be generated, which will increase the probability of mud bags. The annular beam tooth surface 42 is fully provided with annular beam tooth surface water holes 422, which increases the cooling and cleaning area of ​​the drilling fluid at the bottom of the well, greatly improves the efficiency of bottom hole cleaning and cuttings transportation, and effectively inhibits the occurrence of drill bit mud bags caused by cuttings accumulation. At the same time, the drilling fluid flowing out of the annular beam 4 preferentially cools the bottom hole rock, reduces the bottom hole rock strength, improves the rock breaking efficiency of the cutting tooth 21, and can increase the rapid cooling effect of the cutting tooth 21 when the bottom hole temperature is high.

[0026] Embodiment 4: Based on the structure of Example 1, Figure 6-7 As shown, the annular beam tooth surface 42 is completely provided with annular beam tooth surface cutting teeth 421, which increases the tooth density of the drill bit, increases the diamond content of the drill bit, and can increase the service life of the cutting teeth when drilling in highly abrasive formations, thereby increasing the working life of the drill bit.

[0027] Embodiment 5: Based on the structure of Example 2, the annular beam 4 is arranged on the shoulder of the drill body 1, and the annular beam tooth surface 42 is provided with annular beam tooth surface cutting teeth 421 and annular beam tooth surface water holes 422. The cutting teeth on the shoulder of the drill bit have a large linear speed and a large cutting amount, and are the part of the drill bit that is most prone to wear. The annular beam 4 is arranged on the shoulder to greatly increase the tooth density of the shoulder, increase the diamond content in this area, and greatly improve the working life of the cutting teeth 21 in this area.

[0028] Embodiment 6: Based on the structure of Example 2, Figure 8-10 As shown, the annular beam 4 is arranged in the core area of ​​the drill bit body 1, and a plurality of annular beam tooth surface cutting teeth 421 and a plurality of annular beam tooth surface water holes 422 are arranged on the annular beam tooth surface 42. The core tooth density of the drill bit is sparse, and the core cutting teeth are prone to failure when drilling in complex and difficult formations, causing the drill bit to have a core hollowing. The annular beam 4 is arranged in the core area of ​​the drill bit to increase the tooth density of the core area cutting teeth 21, increase the diamond content in the core area, increase the service life of the core area cutting teeth 21, inhibit the occurrence of hollowing failure and other phenomena, and greatly improve the drilling efficiency.

[0029] Embodiment 7: Based on the structure of Example 2, Figure 8 , Fig.11 As shown, the annular beam 4 is arranged at the shoulder and the core area of ​​the drill bit body 1, and a plurality of annular beam tooth surface cutting teeth 421 and a plurality of annular beam tooth surface water holes 422 are arranged on the annular beam tooth surface 42. The annular beam 4 is arranged at the shoulder and the core area of ​​the drill bit body, and the shoulder area with a large cutting amount (also the area with a large wear amount) and the weak core area are strengthened at the same time, which effectively prevents the failure of the shoulder and the core of the drill bit, and greatly improves the working life of the drill bit.

[0030] Embodiment 8: Based on the structure of Example 5, 6 or 7, Figure 8 , Fig.12 As shown, the annular beam tooth surface 42 and the blade tooth surface 20 are at the same height, and a plurality of annular beam tooth surface cutting teeth 421 and a plurality of annular beam tooth surface water holes 422 are provided on the annular beam tooth surface 42. The annular beam tooth surface 42 and the blade tooth surface 20 are arranged at the same height, so that the diamond content of the drill bit is increased when it rotates and scrapes, and the diamond content per unit area is increased, thereby increasing the degree of rock crushing, and the working life of the cutting teeth 21 and the annular beam tooth surface cutting teeth 421 is improved.

[0031] Embodiment 9: Based on the structure of Example 5, 6 or 7, Figure 8 , Fig.13As shown, the annular beam tooth surface 42 is lower than the blade wing tooth surface 20, and the annular beam tooth surface cutting teeth 421 and the annular beam tooth surface water holes 422 are provided on the annular beam tooth surface 42. After the cutting teeth 21 on the blade wing 2 fail, the annular beam tooth surface cutting teeth 421 on the annular beam can continue to crush rocks. At the same time, the annular beam tooth surface water holes 422 on the annular beam continuously cool the cutting teeth 21 and the annular beam tooth surface cutting teeth 421, which greatly reduces the occurrence of thermal wear of the cutting teeth 21 and the annular beam tooth surface cutting teeth 421, improves the service life of the cutting teeth 21 and the annular beam tooth surface cutting teeth 421, and greatly improves the working life of the drill bit.

[0032] Embodiment 10: Based on the structure of Example 8, Fig.14 As shown, the PDC drill bit is a composite rotary head, including a tooth palm 51, a cone 52 and a cone cutting tooth 521. The cone cutting teeth 521 break rocks in an alternating manner, which is beneficial to the cooling of the cutting teeth. At the same time, the ring beam tooth surface cutting teeth 421 and the ring beam tooth surface water holes 422 on the ring beam 4 increase the cooling of the core area of ​​the composite drill bit and increase the drill bit tooth density, thereby improving the working life of the drill bit. The rolling of the cone 52 drill bit reduces the torque of the drill bit, especially in directional wells, the torque reduction effect is better.

[0033] The composite drill bit blade tooth surface 20 is provided with special-shaped cutting teeth 22 and buffer teeth 23. The special-shaped cutting teeth 22 are arranged behind the cutting teeth 21 at the end from top to bottom along the blade tooth surface 20, and the buffer teeth 23 are arranged beside the cutting teeth 21. The special-shaped cutting teeth 22 can improve the tooth penetration ability of hard formations and improve the rock breaking efficiency of the drill bit. The buffer teeth 23 have torque reduction and vibration reduction effects during the drilling process, which can increase the service life of the drill bit.

[0034] A replaceable nozzle 32 is provided between the blade 2 and the tooth palm 51. The large and small nozzles can be replaced according to the drilling parameter requirements to adjust the size of the water hole, thereby changing the hydraulic energy ejected by the nozzle, adjusting the bottom hole hydraulic injection capacity, and improving the drilling efficiency.

[0035] Embodiment 11: Based on the structure of embodiment 9, Fig.14 As shown, the PDC drill bit is a composite rotary head, including a tooth palm 51, a cone 52 and a cone cutting tooth 521. The cone cutting teeth 521 break rocks in an alternating manner, which is beneficial to the cooling of the cutting teeth. At the same time, the ring beam tooth surface cutting teeth 421 and the ring beam tooth surface water holes 422 on the ring beam 4 increase the cooling of the core area of ​​the composite drill bit and increase the drill bit tooth density, thereby improving the working life of the drill bit. The rolling of the cone 52 drill bit reduces the torque of the drill bit, especially in directional wells, the torque reduction effect is better.

[0036] The composite drill bit blade tooth surface 20 is provided with special-shaped cutting teeth 22 and buffer teeth 23. The special-shaped cutting teeth 22 are arranged behind the cutting teeth 21 at the end from top to bottom along the blade tooth surface 20, and the buffer teeth 23 are arranged beside the cutting teeth 21. The special-shaped cutting teeth 22 can improve the tooth penetration ability of hard formations and improve the rock breaking efficiency of the drill bit. The buffer teeth 23 have torque reduction and vibration reduction effects during the drilling process, which can increase the service life of the drill bit.

[0037] A replaceable nozzle 32 is provided between the blade 2 and the tooth palm 51. The large and small nozzles can be replaced according to the drilling parameter requirements to adjust the size of the water hole, thereby changing the hydraulic energy ejected by the nozzle, adjusting the bottom hole hydraulic injection capacity, and improving the drilling efficiency.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ring beam PDC drill bit, characterized in that: The drill bit comprises a drill body (1), a plurality of blades (2) extending from the drill body (1) or fixed on the drill body (1), the blades (2) being provided with a plurality of cutting teeth (21), a chip removal groove (3) being provided between adjacent blades (2), a chip removal groove water hole (31) being provided on the chip removal groove, an annular beam (4) for improving the strength of the blades (2) being provided between at least two blades (2) on the drill bit body (1), and the two blades (2) being connected by the annular beam (4), the upper end surface of the annular beam (4) being an annular beam tooth surface (42), a side of the annular beam (4) close to the drill bit core region being an annular beam inner concave surface (41), and an annular beam inner concave surface water hole (411) being provided on the annular beam inner concave surface (41).

2. The annular beam PDC drill bit according to claim 1, characterized in that: The annular beam cloth tooth surface (42) is provided with annular beam cloth tooth surface cutting teeth (421) and annular beam cloth tooth surface water holes (422).

3. The annular beam PDC drill bit according to claim 1, characterized in that: The annular beam cloth tooth surface (42) is provided with annular beam cloth tooth surface cutting teeth (421).

4. The annular beam PDC drill bit according to claim 1, characterized in that: The annular beam cloth tooth surface (42) is provided with an annular beam cloth tooth surface water hole (422).

5. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The annular beam (4) is arranged on the shoulder of the drill bit body (1).

6. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The annular beam (4) is arranged in the central region of the drill bit body (1).

7. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The annular beam (4) is arranged at the shoulder of the drill bit body (1) and the center area of ​​the drill bit body (1).

8. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The annular beam tooth surface (42) is lower than the blade wing tooth surface (20).

9. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The annular beam tooth surface (42) and the blade tooth surface (20) are at the same height.

10. The annular beam PDC drill bit according to any one of claims 1 to 4, characterized in that: The PDC drill bit is a composite drill bit, comprising a tooth palm (51), a roller cone (52) and a roller cone cutting tooth (521); a blade wing tooth surface (20) of the composite drill bit is provided with a special-shaped cutting tooth (22) and a buffer tooth (23); the special-shaped cutting tooth (22) is arranged behind the end cutting tooth (21) from top to bottom along the blade wing tooth surface; the buffer tooth (23) is arranged beside the cutting tooth (21); and a replaceable nozzle (32) is arranged between the blade wing (2) and the tooth palm (51).

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