Diamond compact and PDC (Polycrystalline Diamond Compact) bit

Abstract

The invention discloses a diamond compact and a PDC drill bit, and relates to the technical field of drill bits, the diamond compact comprises a drill bit body, six groups of connecting plates are arranged on the circumferential outer wall of the drill bit body, a mounting groove is formed in one side of each connecting plate, and a compact body is fixed to the inner diameter of the mounting groove; the specification of the composite sheet body is gradually reduced in the direction away from the bottom end of the drill bit body, a flow guide channel is defined by the two sets of connecting plates, a butt joint base is fixedly connected to the top of the drill bit body, the cross section of the butt joint base is in an isosceles trapezoid shape, a threaded groove is formed in the circumferential outer wall of the butt joint base, and six sets of liquid drainage holes are formed in the bottom of the drill bit body. According to the drill bit, a liquid drainage hole in the end of the drill bit body can be effectively prevented from being blocked, it is guaranteed that cooling liquid can be continuously sprayed out to cool and wash the drill bit body and the composite sheet body, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of drill bits, and in particular to a diamond composite sheet and a PDC drill bit. Background Art

[0002] Drilling engineering is an important means and link in the exploration and development of oil and natural gas. The drill bit is an indispensable drilling tool in the geological drilling industry. The reasonable selection of the drill bit has a huge impact on the quality, speed and cost of oil drilling.

[0003] After searching, the Chinese invention patent application with the publication number CN112302542A discloses a PDC drill bit, which includes a drill bit body, a plurality of blades arranged circumferentially, a first-stage blade, a second-stage blade, a gauge portion, an inner cone portion, a crown arc portion, a first outer cone arc portion, a first straight section portion, a second outer cone arc portion, a second straight section portion and cutting teeth. The above device can improve the drilling speed in the oil and gas exploration and development work of deep wells, ultra-deep wells, and large-diameter well sections, and prolong the service life of the drill bit.

[0004] Based on the existing technology, it is found that the above device still has the following shortcomings: during the drilling process of the drill bit, sludge or impurities are easily squeezed into the nozzle at the end of the drill bit. As the drill bit continues to work, a large amount of sludge is easily squeezed into the nozzle, which will cause the nozzle to be blocked, resulting in the inability to effectively spray the coolant, so that the cutting teeth (composite sheet) at the end of the drill bit are in a high-temperature working state for a long time, greatly reducing the service life of the cutting teeth and the drill bit as a whole. Therefore, a diamond composite sheet and a PDC drill bit are urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and propose a diamond composite sheet and a PDC drill bit. The advantages are: it can effectively prevent the drainage hole at the end of the drill body from being blocked, ensure that the coolant can be continuously sprayed to cool and flush the drill body and the composite sheet, and delay the service life of the drill bit.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A PDC drill bit, comprising a drill bit body, a connecting plate is arranged on the circumferential outer wall of the drill bit body, the number of the connecting plates is six, a mounting groove is provided on one side of the connecting plate, a composite sheet body is fixed to the inner diameter of the mounting groove, the specification of the composite sheet body gradually decreases in the direction away from the bottom end of the drill bit body, two groups of connecting plates surround a flow guide, a docking seat is fixedly connected to the top of the drill bit body, the cross section of the docking seat is an isosceles trapezoid, a threaded groove is arranged on the circumferential outer wall of the docking seat, a drainage hole is arranged on the bottom of the drill bit body, the number of the drainage holes is six, a liquid guide groove is arranged inside the docking seat, a liquid accumulation groove is arranged inside the drill bit body, and the liquid accumulation groove is connected to the drainage hole;

[0008] An anti-blocking component is arranged inside the drain hole;

[0009] A power component for driving the extension and retraction of the anti-blocking component is arranged inside the drill bit body.

[0010] The present invention is further configured such that the power component includes a groove opened inside the drill bit body, the groove is connected to the liquid accumulation groove and the liquid conduction groove, the circumferential inner wall of the liquid accumulation groove is rotatably connected to a first rotating rod, the circumferential outer wall of the first rotating rod is fixedly connected to blades distributed in a circle at equal distances, and the first rotating rod and the liquid conduction groove are vertically arranged.

[0011] The present invention is further configured such that a first gear is fixedly connected to a circumferential outer wall of the first rotating rod, a second gear is meshed with a circumferential outer wall of the first gear, a second rotating rod is fixedly connected to a circumferential inner wall of the second gear, both ends of the second rotating rod are rotatably connected to the circumferential inner wall of the groove, a crank is fixedly connected to a circumferential outer wall of the second rotating rod, a connecting rod is rotatably connected to one end of the crank, a slider is rotatably connected to an end of the connecting rod away from the crank, a support plate is fixedly connected to a circumferential inner wall of the groove, a sliding seat is fixedly connected to one end of the support plate, and a slider is slidably connected to the inside of the sliding seat.

[0012] The present invention is further configured such that a drainage pipe is fixedly connected to the interior of the drainage hole, and the circumferential outer wall of the drainage pipe is provided with liquid separation grooves which are equidistantly distributed in a circular shape.

[0013] The present invention is further configured such that the anti-blocking component includes a shrinkage tube arranged inside the discharge pipe, the circumferential outer wall of the shrinkage tube contacts the circumferential inner wall of the discharge pipe, a diffusion groove is opened on the circumferential outer wall of the shrinkage tube, the cross-section of the diffusion groove is wavy, a narrow throat is arranged at one end of the shrinkage tube, an expansion tube is arranged at the end of the narrow throat away from the shrinkage tube, and the inner diameter of the expansion tube is larger than the inner diameter of the shrinkage tube.

[0014] The present invention is further configured such that an end of the shrink tube away from the narrow throat is fixedly connected to an arc plate, the number of the arc plates is two groups, the two groups of arc plates are cross-distributed, a tooth groove is provided on the outer wall of one side of the arc plate, and a fixing ball is fixedly connected to the intersection of the two groups of arc plates, and the center of the fixing ball is the same as the center of the shrink tube.

[0015] The present invention is further configured such that a fixed circular plate is fixedly connected to the circumferential inner wall of the drainage hole, a spring is fixedly connected to the outer wall on one side of the fixed circular plate, a movable circular plate is fixedly connected to the end of the spring away from the fixed circular plate, a movable circular plate is fixedly connected to the outer wall on one side of the movable circular plate at the end of the expansion tube, a movable rod is fixedly connected to the middle of the movable circular plate, a pressing ball is fixedly connected to the end of the movable rod away from the movable circular plate, the circumferential outer walls of the two groups of fixed circular plates are fixedly connected to fixed frames, and the fixed frames are fixedly connected to the inner wall of the liquid accumulation tank.

[0016] The present invention is further configured such that an outer plate is provided inside the liquid accumulation groove, the circumferential outer wall of the outer plate contacts the circumferential outer walls of the four groups of pressing balls, the inner plate is fixedly connected to the inside of the outer plate, the circumferential outer wall of the inner plate contacts the circumferential outer walls of the two groups of pressing balls, the top outer wall of the outer plate is fixedly connected to a cross, the bottom outer wall of the slider is fixedly connected to a vertical rod, and the bottom end of the vertical rod is fixedly connected to the cross.

[0017] A diamond composite sheet comprises an alloy base, a diamond layer is arranged on one side of the alloy base, and a positioning groove is provided at one end of the alloy base away from the diamond layer.

[0018] The present invention is further configured such that a cutting bump is provided on one side outer wall of the diamond layer, and a second arc groove and a first arc groove are provided on the top outer wall of the cutting bump and are equidistantly and circularly distributed, and the inner diameter of the second arc groove is greater than the inner diameter of the first arc groove.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention can effectively prevent the drainage hole at the end of the drill body from being blocked during the drilling process of the drill bit, ensuring that the coolant can be continuously sprayed to cool and flush the drill body and the composite sheet, thereby delaying the service life of the drill bit;

[0021] 2. In the present invention, the composite sheet body is provided with a cutting protrusion at the end of the diamond layer, which not only enables the composite sheet to be more easily penetrated into the formation, improves its rock breaking efficiency, effectively provides mechanical drilling speed and reduces drill bit mud packing, but also the first arc groove and the second arc groove provided on the outer wall of the cutting protrusion can prolong the contact time between the coolant and the diamond layer, thereby further reducing the working temperature of the composite sheet body and effectively prolonging the service life of the composite sheet body;

[0022] 3. In the present invention, the coolant can be sprayed faster and over a wider area, thereby increasing the flushing and cooling area of ​​the drainage hole on the end of the drill body, so that the drill body and the composite sheet can be more fully in contact with the coolant, effectively extending the service life of the drill body and the composite sheet. The liquid separation groove can also achieve a good liquid separation effect. When the shrink tube is in a state of dredging the drainage hole, one end of the shrink tube will extend from the end of the drainage tube. At this time, the other part of the coolant will not be sprayed out from the liquid separation groove, but will be quickly sprayed out from the diffusion groove, which can still achieve a good dispersion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A front view of a PDC drill bit proposed by the present invention;

[0024] Figure 2 A side view of a PDC drill bit proposed by the present invention;

[0025] Figure 3 A PDC drill bit proposed by the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 4 A schematic diagram of the disassembled structure of a liquid discharge pipe and an anti-blocking component of a PDC drill bit proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the overall cross-sectional structure of a PDC drill bit proposed by the present invention;

[0028] Figure 6 A PDC drill bit proposed by the present invention Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0029] Figure 7 A PDC drill bit proposed by the present invention Figure 5 Schematic diagram of the enlarged structure at point C in the middle.

[0030] Figure 8 This is a schematic diagram of the disassembled internal structure of a PDC drill bit body proposed by the present invention.

[0031] Fig. 9 A PDC drill bit proposed by the present invention Figure 8 Schematic diagram of the enlarged structure at D in the middle.

[0032] Fig.10 This is a schematic diagram of the overall structure of a diamond composite sheet proposed by the present invention.

[0033] Fig.11 This is a schematic diagram of the diamond composite sheet cutting bump structure proposed by the present invention.

[0034] In the figure: 1, drill body; 2, docking seat; 3, flow guide; 4, composite sheet; 4001, alloy base; 4002, positioning groove; 4003, diamond layer; 4004, cutting bump; 4005, first arc groove; 4006, second arc groove; 5, mounting groove; 6, connecting plate; 7, drainage hole; 8, liquid separation groove; 9, drainage pipe; 10, contraction pipe; 11, fixed ball; 12, arc plate; 13, diffusion groove; 14, tooth groove; 15, expansion pipe; 16, Narrow throat; 17, movable circular plate; 18, fixed circular plate; 19, spring; 20, movable rod; 21, pressing ball; 22, groove; 23, liquid accumulation groove; 24, liquid guide groove; 25, first rotating rod; 26, first gear; 27, second gear; 28, second rotating rod; 29, crank; 30, connecting rod; 31, blade; 33, outer disk; 34, inner disk; 35, fixed frame; 37, slide seat; 38, support plate; 39, slider; 40, vertical rod; 41, cross. DETAILED DESCRIPTION

[0035] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Reference Figure 1-Figure 9 The present invention provides a PDC drill bit, comprising a drill bit body 1, a connecting plate 6 is arranged on the circumferential outer wall of the drill bit body 1, the number of the connecting plates 6 is six, a mounting groove 5 is opened on one side of the connecting plate 6, a composite sheet 4 is fixed to the inner diameter of the mounting groove 5, the specification of the composite sheet 4 gradually decreases in the direction away from the bottom end of the drill bit body 1, two groups of connecting plates 6 surround a flow guide 3, a docking seat 2 is fixedly connected to the top of the drill bit body 1, the cross section of the docking seat 2 is an isosceles trapezoid, a threaded groove is opened on the circumferential outer wall of the docking seat 2, a drainage hole 7 is opened at the bottom of the drill bit body 1, the number of the drainage holes 7 is six, a liquid guide groove 24 is opened inside the docking seat 2, a liquid accumulation groove 23 is opened inside the drill bit body 1, and the liquid accumulation groove 23 is connected to the drainage hole 7;

[0038] An anti-blocking component is provided inside the drain hole 7;

[0039] The interior of the drill body 1 is provided with a power component for driving the extension and retraction of the anti-blocking component, which can effectively prevent the drainage hole 7 at the end of the drill body 1 from being blocked, ensuring that the coolant can be continuously sprayed out to cool and flush the drill body 1 and the composite sheet body 4, thereby delaying the service life of the drill bit.

[0040] In order to provide a power source for subsequent anti-blocking components, refer to Figure 5-Figure 6 The power assembly includes a groove 22 provided inside the drill body 1, the groove 22 is connected with the liquid accumulation groove 23 and the liquid guide groove 24, the circumferential inner wall of the liquid accumulation groove 23 is rotatably connected with a first rotating rod 25, the circumferential outer wall of the first rotating rod 25 is fixedly connected with blades 31 distributed in a circle at equal distances, the first rotating rod 25 and the liquid guide groove 24 are vertically arranged, because the liquid guide groove 24 and the first rotating rod 25 are vertically arranged, so that the coolant directly rushes to the blade 31, when the blade 31 is subjected to the impact force of the coolant, it will drive the first rotating rod 25 to rotate, so that the rotation of the first rotating rod 25 can be realized without external power supply.

[0041] In order to ensure that the slider 39 can stably perform vertical reciprocating motion, refer to Figure 5-Figure 6 The circumferential outer wall of the first rotating rod 25 is fixedly connected with a first gear 26, the circumferential outer wall of the first gear 26 is meshed with a second gear 27, the circumferential inner wall of the second gear 27 is fixedly connected with a second rotating rod 28, both ends of the second rotating rod 28 are rotatably connected to the circumferential inner wall of the groove 22, the circumferential outer wall of the second rotating rod 28 is fixedly connected with a crank 29, one end of the crank 29 is rotatably connected with a connecting rod 30, and the end of the connecting rod 30 away from the crank 29 is rotatably connected with a slider 39, the circumferential inner wall of the groove 22 is fixedly connected with a support plate 38, one end of the support plate 38 is fixedly connected There is a slide seat 37, and a slider 39 is slidably connected inside the slide seat 37. The rotation of the first rotating rod 25 can drive the first gear 26 to rotate together. At the same time, the first gear 26 and the second gear 27 are engaged with each other, which can drive the second gear 27 to rotate together. The diameter of the second gear 27 is smaller than that of the first gear 26, so that a good speed-increasing effect can be achieved. When the second gear 27 rotates, it can drive the second rotating rod 28 to rotate. The crank 29 and connecting rod 30 structure arranged on the outer wall of the circumference of the second rotating rod 28 can make the slider 39 reciprocate vertically inside the slide seat 37.

[0042] In order to increase the spraying area of ​​the coolant by the drain pipe 9, refer to Figure 3 A drainage pipe 9 is fixedly connected to the inside of the drainage hole 7, and the circumferential outer wall of the drainage pipe 9 is provided with liquid separation grooves 8 distributed in a circular shape at equal distances. The coolant will be sprayed out from the liquid separation grooves 8 at the end of the drainage pipe 9, and a good liquid separation effect can also be achieved through the liquid separation grooves 8.

[0043] In order to speed up the coolant spraying rate, refer to Figure 4-Figure 9The anti-blocking component includes a shrink tube 10 arranged inside the drain pipe 9, the circumferential outer wall of the shrink tube 10 contacts the circumferential inner wall of the drain pipe 9, the circumferential outer wall of the shrink tube 10 is provided with a diffusion groove 13, the cross-section of the diffusion groove 13 is wavy, a narrow throat 16 is arranged at one end of the shrink tube 10, an expansion tube 15 is arranged at the end of the narrow throat 16 away from the shrink tube 10, the inner diameter of the expansion tube 15 is larger than the inner diameter of the shrink tube 10, after the coolant is sprayed from the liquid accumulation groove 23 into the expansion tube 15, due to the changes in the inner diameters of the expansion tube 15, the narrow throat 16 and the shrink tube 10, the coolant can be accelerated, thereby improving the spraying rate of the coolant.

[0044] In order to expand the coolant spray area, refer to Figure 3-Figure 4 One end of the shrink tube 10 away from the narrow throat 16 is fixedly connected with an arc plate 12. There are two groups of arc plates 12. The two groups of arc plates 12 are cross-distributed. A tooth groove 14 is opened on the outer wall of one side of the arc plate 12. A fixed ball 11 is fixedly connected at the intersection of the two groups of arc plates 12. The center of the fixed ball 11 is the same as the center of the shrink tube 10. The coolant directly rushes into the fixed ball 11 and the arc plate 12, and the coolant collides with the tooth groove 14 on the outer wall of the fixed ball 11 and the arc plate 12, so that the coolant can be quickly dispersed, thereby expanding the spray area of ​​the coolant.

[0045] In order to prevent the drain pipe 9 and the drain hole 7 from being blocked, refer to Figure 4-Figure 9 The circumferential inner wall of the discharge hole 7 is fixedly connected with a fixed circular plate 18, and a spring 19 is fixedly connected with an outer wall of one side of the fixed circular plate 18. The end of the spring 19 away from the fixed circular plate 18 is fixedly connected with a movable circular plate 17. The outer wall of one side of the movable circular plate 17 is fixedly connected to the end of the expansion tube 15. The middle part of the movable circular plate 17 is fixedly connected with a movable rod 20, and the end of the movable rod 20 away from the movable circular plate 17 is fixedly connected with a pressing ball 21. The circumferential outer walls of the two groups of fixed circular plates 18 are fixedly connected with a fixing frame 35, and the fixing frame 35 is fixedly connected to the inner wall of the liquid accumulation groove 23. An outer disk 33 is arranged inside the liquid accumulation groove 23. The circumferential outer wall of the outer disk 33 contacts the circumferential outer wall of the four groups of pressing balls 21. The outer disk The inner plate 33 is fixedly connected to the inside thereof, and the circumferential outer wall of the inner plate 34 contacts the circumferential outer wall of the two groups of pressing balls 21; the top outer wall of the outer plate 33 is fixedly connected to a cross 41; the bottom outer wall of the slider 39 is fixedly connected to a vertical rod 40; the bottom end of the vertical rod 40 is fixedly connected to the cross 41; the vertical movement of the outer plate 33 and the inner plate 34 can apply pressure to the six groups of pressing balls 21; when the pressing balls 21 are subjected to pressure, the movable circular plate 17 and the expansion tube 15 are driven to descend as a whole, so that the expansion tube 15, the narrow throat tube 16 and the contraction tube 10 make reciprocating motion inside the drain pipe 9, which has a good silt removal effect and prevents the inside of the drain pipe 9 from being blocked by sludge and impurities, affecting the normal spraying of the coolant.

[0046] Reference Figure 10-11 The present invention provides a diamond composite sheet, including an alloy base 4001, a diamond layer 4003 is arranged on one side of the alloy base 4001, and a positioning groove 4002 is opened at one end of the alloy base 4001 away from the diamond layer 4003, which effectively improves the strength of the entire composite sheet body 4, so that it combines the high hardness, high wear resistance and thermal conductivity of diamond, and the strength and impact toughness of cemented carbide.

[0047] A cutting bump 4004 is provided on one side outer wall of the diamond layer 4003, and a second arc groove 4006 and a first arc groove 4005 are provided on the top outer wall of the cutting bump 4004, which are equidistantly distributed in a circle, and the inner diameter of the second arc groove 4006 is larger than the inner diameter of the first arc groove 4005. By arranging the cutting bump 4004 at the end of the diamond layer 4003, the composite sheet 4 can not only make it easier for the composite sheet to penetrate into the formation and improve its rock breaking efficiency, effectively provide mechanical drilling speed and reduce drill bit mud packing, but also the first arc groove 4005 and the second arc groove 4006 arranged on the outer wall of the cutting bump 4004 can prolong the contact time between the coolant and the diamond layer 4003, thereby further reducing the working temperature of the composite sheet 4 and effectively prolonging the service life of the composite sheet 4.

[0048] Working principle: When in use, the staff introduces coolant into the drill body 1. Since the liquid guide groove 24 and the first rotating rod 25 are vertically arranged, the coolant directly rushes to the blade 31. When the blade 31 is impacted by the coolant, the first rotating rod 25 is driven to rotate. The rotation of the first rotating rod 25 can drive the first gear 26 to rotate together. At the same time, the first gear 26 and the second gear 27 are meshed with each other, which can drive the second gear 27 to rotate together. The diameter of the second gear 27 is smaller than that of the first gear 26, so that a good speed-increasing effect can be achieved. When the second gear 27 rotates, the second rotating rod 28 can be driven to rotate. The crank 29 and connecting rod 30 structure arranged on the outer wall of the circumference of the second rotating rod 28 can make the slider 39 reciprocate vertically inside the sliding seat 37. At the same time, the outer disk 33 is fixedly connected to the slider 39 through the vertical rod 40, and the inner disk 34 is fixedly connected inside the outer disk 33. Therefore, when the slider 39 reciprocates in the vertical direction, the outer disk 33 and the inner disk 34 are also driven to reciprocate in the vertical direction. The vertical movement of the outer disk 33 and the inner disk 34 can apply pressure to the six groups of pressing balls 21. When the pressing balls 21 are subjected to pressure, the movable circular plate 17 and the expansion tube 15 are driven to descend as a whole, so that the expansion tube 15, the narrow throat tube 16 and The shrink tube 10 reciprocates inside the drain pipe 9, achieving a good desilting effect, preventing the drain pipe 9 from being blocked by sludge and impurities and affecting the normal spraying of the coolant. At the same time, the arc plate 12 and the fixed ball 11 fixed at the end of the shrink tube 10 can increase the contact area with the sludge, thereby improving the desilting effect of the shrink tube 10 on the drain pipe 9. After the coolant is sprayed from the liquid accumulation tank 23 into the expansion tube 15, the change in the inner diameters of the expansion tube 15, the narrow throat 16 and the shrink tube 10 can accelerate the coolant, thereby improving the spraying rate of the coolant. At the same time, if the end of the shrink tube 10 does not extend from one end of the drain pipe 9 , a part of the coolant directly hits the fixed ball 11 and the arc plate 12, and the coolant collides with the tooth grooves 14 on the outer walls of the fixed ball 11 and the arc plate 12, so that the coolant can be quickly dispersed, thereby expanding the spray area of ​​the coolant. At the same time, another part of the coolant will be sprayed out from the liquid separation groove 8 at the end of the drain pipe 9, and the liquid separation groove 8 can also achieve a good liquid separation effect. When the shrink tube 10 is in a state of silting the drain hole 7, one end of the shrink tube 10 will extend from the end of the drain pipe 9. At this time, the other part of the coolant will not be sprayed out from the liquid separation groove 8, but will be quickly sprayed out from the diffusion groove 13, which can still achieve a good dispersion effect.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PDC drill bit, comprising a drill bit body (1), characterized in that: The circumferential outer wall of the drill body (1) is provided with a connecting plate (6), the number of the connecting plates (6) is six, a mounting groove (5) is provided on one side of the connecting plate (6), the composite sheet (4) is fixed to the inner diameter of the mounting groove (5), the specification of the composite sheet (4) gradually decreases in the direction away from the bottom end of the drill body (1), two groups of the connecting plates (6) surround a flow guide (3), the top of the drill body (1) is fixedly connected with a docking seat (2), the cross section of the docking seat (2) is an isosceles trapezoid, the circumferential outer wall of the docking seat (2) is provided with a threaded groove, the bottom of the drill body (1) is provided with a drainage hole (7), the number of the drainage holes (7) is six, the interior of the docking seat (2) is provided with a liquid guide groove (24), the interior of the drill body (1) is provided with a liquid accumulation groove (23), and the liquid accumulation groove (23) is connected to the drainage hole (7); An anti-blocking component is arranged inside the drainage hole (7); The drill bit body (1) is provided inside with a power component for driving the anti-blocking component to extend and retract.

2. A PDC drill bit according to claim 1, characterized in that: The power assembly comprises a groove (22) provided inside the drill bit body (1), the groove (22) being connected to the liquid collection groove (23) and the liquid conducting groove (24), the circumferential inner wall of the liquid collection groove (23) being rotatably connected to a first rotating rod (25), the circumferential outer wall of the first rotating rod (25) being fixedly connected to blades (31) distributed in a circular shape at equal distances, and the first rotating rod (25) and the liquid conducting groove (24) being arranged vertically.

3. A PDC drill bit according to claim 2, characterized in that: The circumferential outer wall of the first rotating rod (25) is fixedly connected with a first gear (26), the circumferential outer wall of the first gear (26) is meshed with a second gear (27), the circumferential inner wall of the second gear (27) is fixedly connected with a second rotating rod (28), both ends of the second rotating rod (28) are rotatably connected to the circumferential inner wall of the groove (22), the circumferential outer wall of the second rotating rod (28) is fixedly connected with a crank (29), one end of the crank (29) is rotatably connected with a connecting rod (30), the end of the connecting rod (30) away from the crank (29) is rotatably connected with a slider (39), the circumferential inner wall of the groove (22) is fixedly connected with a support plate (38), one end of the support plate (38) is fixedly connected with a slide seat (37), and the inside of the slide seat (37) is slidably connected with a slider (39).

4. A PDC drill bit according to claim 3, characterized in that: A liquid discharge pipe (9) is fixedly connected to the inside of the liquid discharge hole (7), and liquid separation grooves (8) are arranged at equal distances and in a circular shape on the circumferential outer wall of the liquid discharge pipe (9).

5. A PDC drill bit according to claim 4, characterized in that: The anti-blocking component comprises a shrinkable tube (10) arranged inside the drainage pipe (9), the circumferential outer wall of the shrinkable tube (10) contacts the circumferential inner wall of the drainage pipe (9), a diffusion groove (13) is provided on the circumferential outer wall of the shrinkable tube (10), the cross section of the diffusion groove (13) is wavy, a narrow throat (16) is provided at one end of the shrinkable tube (10), an expansion tube (15) is provided at one end of the narrow throat (16) away from the shrinkable tube (10), and the inner diameter of the expansion tube (15) is larger than the inner diameter of the shrinkable tube (10).

6. A PDC drill bit according to claim 5, characterized in that: An end of the shrinkable tube (10) away from the narrow throat tube (16) is fixedly connected to an arc plate (12), the number of the arc plates (12) is two groups, the two groups of arc plates (12) are cross-distributed, one side of the outer wall of the arc plate (12) is provided with a tooth groove (14), and a fixing ball (11) is fixedly connected to the intersection of the two groups of arc plates (12), and the center of the fixing ball (11) is the same as the center of the shrinkable tube (10).

7. A PDC drill bit according to claim 6, characterized in that: The circumferential inner wall of the drainage hole (7) is fixedly connected to a fixed circular plate (18), the outer wall of one side of the fixed circular plate (18) is fixedly connected to a spring (19), the end of the spring (19) away from the fixed circular plate (18) is fixedly connected to a movable circular plate (17), the outer wall of one side of the movable circular plate (17) is fixedly connected to the end of the expansion tube (15), the middle of the movable circular plate (17) is fixedly connected to a movable rod (20), the end of the movable rod (20) away from the movable circular plate (17) is fixedly connected to a pressing ball (21), the circumferential outer walls of the two groups of fixed circular plates (18) are fixedly connected to fixed frames (35), and the fixed frames (35) are fixedly connected to the inner wall of the liquid accumulation groove (23).

8. A PDC drill bit according to claim 7, characterized in that: An outer plate (33) is arranged inside the liquid accumulation groove (23), and the circumferential outer wall of the outer plate (33) contacts the circumferential outer walls of the four groups of pressing balls (21). An inner plate (34) is fixedly connected inside the outer plate (33), and the circumferential outer wall of the inner plate (34) contacts the circumferential outer walls of the two groups of pressing balls (21). A cross (41) is fixedly connected to the top outer wall of the outer plate (33), and a vertical rod (40) is fixedly connected to the bottom outer wall of the slider (39), and the bottom end of the vertical rod (40) is fixedly connected to the cross (41).

9. A diamond composite sheet, using a PDC drill bit according to any one of claims 1 to 8, comprising an alloy base (4001), characterized in that: A diamond layer (4003) is disposed on one side of the alloy base (4001), and a positioning groove (4002) is provided on one end of the alloy base (4001) away from the diamond layer (4003).

10. The diamond composite sheet according to claim 9, characterized in that: A cutting bump (4004) is provided on one side outer wall of the diamond layer (4003), and a second arc-shaped groove (4006) and a first arc-shaped groove (4005) are provided on the top outer wall of the cutting bump (4004) and are equidistantly distributed in a circular shape, and the inner diameter of the second arc-shaped groove (4006) is greater than the inner diameter of the first arc-shaped groove (4005).

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