Diamond-impregnated drill bit

Abstract

The invention provides a diamond-impregnated drill bit. The diamond-impregnated drill bit is added with the wear-resistant TSP prepared by the invention and the speed-increasing diamond-impregnated block containing the wear-resistant TSP, and compared with a diamond-impregnated drill bit which is not added with TSP and only added with diamond single crystals in the prior art, the diamond-impregnated drill bit has the advantages that the mechanical rotating speed is increased by nearly 60%, the footage is increased by 65%, and the speed-increasing diamond-impregnated block containing the wear-resistant TSP is increased by 60%. The diamond-impregnated drill bit is high in mechanical rotating speed and large in drilling footage, and oil and gas drilling and geological drilling with high drilling speed, large drilling footage, high efficiency, low drill bit loss and low cost can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas drilling and geological drilling, and particularly relates to an impregnated diamond bit. Background Art

[0002] The impregnated diamond bit is a commonly used bit in the fields of oil and gas drilling and geological drilling. It usually adds synthetic diamond single crystals and natural diamonds. The coarsest grain size for industrial application of synthetic diamond single crystals is 20 mesh, and there are few natural diamonds with coarse grain sizes and they are very expensive. The existing impregnated diamond bits have limitations in terms of mechanical drilling speed and footage, and there are problems such as low drilling efficiency, high bit wear, and high drilling costs. Tests show that the diamond grain size is positively correlated with the mechanical drilling speed of impregnated diamond blocks and impregnated diamond bits, and the influence is relatively significant. Therefore, to further increase the speed, it is necessary to increase the coarseness of the diamond grain size.

[0003] In the fields of oil and gas drilling and geological drilling, the bit is an essential downhole tool in the drilling construction process. The formation rock is broken by the bit and drilling is carried out thereby to form a wellbore. The cutting elements and wear-resistant elements of the bit are the key factors for improving the rock-breaking efficiency in complex formations, increasing the drilling speed, and reducing the drilling cost. Therefore, the quality of a bit and the length of the drilling time are closely related to the cutting elements and wear-resistant elements of the bit. Thermally stable polycrystalline diamond (TSP) is the cutting element and wear-resistant element of the diamond bit. Currently, the main components of TSP are diamond, silicon, nickel, boron, etc. The advantage is good temperature resistance, and the highest temperature resistance reaches 1200°C. The existing problem is that the wear resistance is much worse than that of PDC (polycrystalline diamond compact), and the wear ratio is generally 30,000 to 100,000, only 1 / 20 to 1 / 4 of the PDC compact. And the PDC compact is the main component of the PDC bit. The PDC bit can achieve good use effects in soft to medium-hard formations, so it has been widely used in oil and geological drilling. The main components of PDC are diamond and cobalt. The advantage is extremely high wear resistance, and the disadvantage is that the temperature resistance is worse than that of TSP. Generally, it starts to graphitize at 350°C and can withstand temperatures below 800°C for a short time. Based on the above situation, if a TSP that is both wear-resistant and high-temperature resistant can be developed, made into an impregnated diamond block, and then applied in an impregnated diamond bit, the problems existing in the existing impregnated diamond bits can be solved. Summary of the Invention

[0004] The present invention provides an impregnated diamond bit, including a bit body 1 and a speed-up impregnated diamond block 2, wherein:

[0005] The bit body includes a main body part 5 with a cutter wing 4 provided on the crown 3 and a crown surface layer 6;

[0006] The speed-up impregnated diamond block is arranged on the cutter wing and covers the generatrix of the cutter wing;

[0007] The surface layer of the crown portion includes a first wear-resistant TSP 6-1;

[0008] The speed-up impregnated diamond segments include a second wear-resistant TSP.

[0009] In the present invention, the shape of the crown portion of the drill bit body can be determined according to actual needs. For example, a B-shaped profile can be adopted and the size of the internal taper angle can be adjusted. The number of cutter wings provided on the crown portion can also be determined according to actual needs.

[0010] According to a specific embodiment of the present invention, the first wear-resistant TSP or the second wear-resistant TSP is prepared by the following method:

[0011] 1) Remove the cemented carbide layer from the polycrystalline diamond compact with a wear ratio of not less than 400,000, and retain the polycrystalline diamond layer;

[0012] 2) Cut the polycrystalline diamond layer to obtain the first wear-resistant TSP or the second wear-resistant TSP.

[0013] According to a specific embodiment of the present invention, in step 2), after cutting the polycrystalline diamond layer, perform a first decobaltization to obtain the first wear-resistant TSP or the second wear-resistant TSP; or

[0014] In step 2), after cutting the polycrystalline diamond layer, deposit a first metal coating on the surface to obtain the first wear-resistant TSP or the second wear-resistant TSP; or

[0015] In step 2), after cutting the polycrystalline diamond layer, perform a second decobaltization, and then deposit a second metal coating on the surface to obtain the first wear-resistant TSP or the second wear-resistant TSP.

[0016] According to a specific embodiment of the present invention, in step 2), the depth of the first decobaltization and the depth of the second decobaltization are independently not less than 500 μm;

[0017] Preferably, in step 2), the cutting is wire cutting.

[0018] In the present invention, in step 2), the shape of the cut polycrystalline diamond layer can be determined according to actual needs, for example, cut into a pyramid (such as a triangular pyramid), a prism (such as a cube or a cuboid), or a cylindrical shape, including but not limited to these.

[0019] According to a specific embodiment of the present invention, in step 2), the thickness of the first metal coating and the second metal coating are independently 1 to 3 μm; and / or

[0020] The first metal coating and the second metal coating are independently a titanium coating or a nickel coating.

[0021] According to a specific embodiment of the present invention, after cutting the polycrystalline diamond layer, it is immersed in a decobalt solution for the first decobalt or the second decobalt;

[0022] Preferably, the decobalt solution is a mixed solution of sulfuric acid, Lewis acid and phosphate;

[0023] Preferably, taking the mass of the decobalt solution as 100%, the decobalt solution includes 1 to 3 wt% sulfuric acid, 15 to 20 wt% Lewis acid, 2 to 5 wt% phosphate and the balance of water; and / or

[0024] The Lewis acid is ferric chloride; and / or the phosphate is sodium dihydrogen phosphate or potassium dihydrogen phosphate.

[0025] In the present invention, considering that the decobalt depth of a single decobalt is limited, in order to achieve the decobalt depth required by the present invention, the first decobalt and the second decobalt are cyclic decobalts. After each decobalt, the cumulative decobalt depth is detected until the decobalt depth required by the present invention is reached.

[0026] It should be noted that the conditions and operation steps of decobalt are prior art, so the present invention will not elaborate on the conditions and operation steps of decobalt.

[0027] According to a specific embodiment of the present invention, the first decobalt and the second decobalt are independently full decobalts.

[0028] The full decobalt referred to in the present invention means that the decobalt rate reaches 100%.

[0029] According to a specific embodiment of the present invention, the first metal coating is obtained by first vacuum plating; and / or

[0030] The second metal coating is obtained by second vacuum plating.

[0031] It should be noted that the conditions and operation steps for obtaining a titanium coating (or nickel coating) by vacuum plating are prior art, so the present invention will not elaborate on the conditions and operation steps of vacuum plating.

[0032] According to a specific embodiment of the present invention, the speed-up impregnated diamond block further includes first diamond and first matrix powder;

[0033] Preferably, the first diamond is at least one of coarse-grained diamond single crystal, fine-grained diamond single crystal, first natural diamond and second natural diamond; and / or

[0034] The first matrix powder includes tungsten carbide powder, nickel powder, cobalt powder and copper-based alloy powder.

[0035] According to a specific embodiment of the present invention, in the speed-up impregnated diamond block, the second wear-resistant TSP, the first diamond, and the first matrix powder are uniformly mixed; or

[0036] The second wear-resistant TSP is arranged in an orderly manner in the mixture of the first diamond and the first matrix powder; or

[0037] At least one of the coarse-grained diamond single crystal and the first natural diamond and the second wear-resistant TSP are arranged in an orderly manner in the mixture of at least one of the fine-grained diamond single crystal and the second natural diamond and the first matrix powder; or

[0038] At least one of the coarse-grained diamond single crystal and the first natural diamond and the second wear-resistant TSP are arranged in an orderly manner in the first matrix powder.

[0039] According to a specific embodiment of the present invention, taking the mass of the speed-up impregnated diamond block as 100%, the speed-up impregnated diamond block includes 1 to 10 wt% of the second wear-resistant TSP, 1 to 25 wt% of the first diamond, and 65 to 95 wt% of the first matrix powder; or

[0040] Taking the mass of the speed-up impregnated diamond block as 100%, the speed-up impregnated diamond block includes 0.7 to 20 wt% of the second wear-resistant TSP, 0 to 39 wt% of the coarse-grained diamond single crystal, 0 to 39 wt% of the first natural diamond, 60 to 99 wt% of the first matrix powder, 0 to 20 wt% of the fine-grained diamond single crystal, and 0 to 20 wt% of the second natural diamond;

[0041] Preferably, taking the mass of the speed-up impregnated diamond block as 100%, the speed-up impregnated diamond block includes 6.3 wt% of the second wear-resistant TSP, 10.4 wt% of the first diamond, and 83.3 wt% of the first matrix powder; or

[0042] Taking the mass of the speed-up impregnated diamond block as 100%, the speed-up impregnated diamond block includes 0.7 to 5 wt% of the second wear-resistant TSP, 0 to 11 wt% of the coarse-grained diamond single crystal, 0 to 1.6 wt% of the first natural diamond, 84 to 99 wt% of the first matrix powder, 0 to 11 wt% of the fine-grained diamond single crystal, and 0 to 11 wt% of the second natural diamond.

[0043] According to a specific embodiment of the present invention, taking the mass of the first matrix powder as 100%, the first matrix powder includes 30 to 60 wt% of the tungsten carbide powder, 5 to 20 wt% of the nickel powder, 0 to 30 wt% of the cobalt powder, and 20 to 35 wt% of the copper-based alloy powder.

[0044] According to a specific embodiment of the present invention, the particle size of the coarse-grained diamond single crystal is 0.5 to 1 mm; and / or

[0045] the particle size of the fine-grained diamond single crystal is 0.05 to 0.5 mm; and / or

[0046] the particle sizes of the first natural diamond and the second natural diamond are independently 0.3 to 3 mm; and / or

[0047] the average particle size of the first matrix powder is 10 to 150 μm;

[0048] Preferably, in the first matrix powder, the average particle size of the tungsten carbide powder is 38 to 150 μm; and / or the average particle size of the nickel powder is 38 to 150 μm; and / or the average particle size of the cobalt powder is 10 to 25 μm; and / or the average particle size of the copper-based alloy powder is 38 to 75 μm.

[0049] According to a specific embodiment of the present invention, the speed-up impregnated diamond block is prepared by the following method:

[0050] Sinter the raw material layer composed of the second wear-resistant TSP, the first diamond, and the first matrix powder to obtain the speed-up impregnated diamond block;

[0051] Preferably, the first diamond is at least one of the coarse-grained diamond single crystal, the fine-grained diamond single crystal, the first natural diamond, and the second natural diamond.

[0052] According to a specific embodiment of the present invention, the raw material layer is prepared by the following steps:

[0053] Mix the second wear-resistant TSP, the first diamond, and the first matrix powder, and spread the powder to obtain the raw material layer.

[0054] According to a specific embodiment of the present invention, the raw material layer is prepared by the following steps:

[0055] (1) Mix the first diamond and the first matrix powder to obtain a first mixed powder;

[0056] (2) Spread the first mixed powder;

[0057] (3) Arrange the second wear-resistant TSP in an orderly manner on the first mixed powder to form a first particle layer;

[0058] (4) Repeat steps (2) and (3), and finally spread the first mixed powder on the first particle layer to obtain the raw material layer;

[0059] Preferably, in step (4), the second wear-resistant TSPs arranged in an orderly manner in the raw material layer form a three-dimensional cross-covering arrangement.

[0060] According to a specific embodiment of the present invention, the raw material layer is prepared through the following steps:

[0061] A Mix at least one of the fine-grained diamond single crystals and the second natural diamond with the first matrix powder to obtain a second mixed powder;

[0062] B Spread the second mixed powder;

[0063] C Arrange at least one of the coarse-grained diamond single crystals and the first natural diamond and the second wear-resistant TSP in an orderly manner on the second mixed powder to form a second particle layer;

[0064] D Repeat steps B and C, and finally spread the second mixed powder on the second particle layer to obtain the raw material layer;

[0065] Preferably, in step D, at least one of the coarse-grained diamond single crystals and the first natural diamond and the second wear-resistant TSP arranged in an orderly manner in the raw material layer form a three-dimensional cross-covering arrangement.

[0066] According to a specific embodiment of the present invention, the raw material layer is prepared through the following steps:

[0067] (a) Spread the first matrix powder;

[0068] (b) Arrange at least one of the coarse-grained diamond single crystals and the first natural diamond and the second wear-resistant TSP in an orderly manner on the first matrix powder to form a third particle layer;

[0069] (c) Repeat steps (a) and (b), and finally spread the first matrix powder on the third particle layer to obtain the raw material layer;

[0070] Preferably, in step (c), at least one of the coarse-grained diamond single crystals and the first natural diamond and the second wear-resistant TSP arranged in an orderly manner in the raw material layer form a three-dimensional cross-covering arrangement.

[0071] In the present invention, the orderly arrangement means that the orderly particles (referring to the second wear-resistant TSP or the coarse-grained diamond single crystal or the first natural diamond) are arranged in a two-dimensional plane in the manner of "particle, gap, particle".

[0072] Furthermore, in the present invention, the three-dimensional cross-coverage arrangement means that: the ordered particles are arranged in an orderly manner in a two-dimensional plane parallel to the powder distribution plane in the pattern of "particle, void, particle", and are also arranged in an orderly manner in a two-dimensional plane perpendicular to the powder distribution plane in the pattern of "particle, void, particle", and the orthographic projections of all the ordered particles cover the powder distribution plane; specifically:

[0073] Between any two adjacent layers of the first mixed powder, a layer of second wear-resistant TSP is laid to form the first particle layer, and there is a uniform void between any two adjacent second wear-resistant TSPs, and the void is filled with the two adjacent layers of the first mixed powder due to gravity, and the orthographic projections of all the second wear-resistant TSPs cover the powder distribution plane of the first mixed powder; or

[0074] Between any two adjacent layers of the second mixed powder, a layer of second wear-resistant TSP or a layer of coarse-grained diamond single crystal is laid to form the second particle layer; among them, there is a uniform void between any two adjacent second wear-resistant TSPs or between any two adjacent coarse-grained diamond single crystals, and the void is filled with the two adjacent layers of the second mixed powder due to gravity, and the orthographic projections of all the second wear-resistant TSPs and coarse-grained diamond single crystals cover the powder distribution plane of the second mixed powder; or

[0075] Between any two adjacent layers of the second mixed powder, a layer of second wear-resistant TSP or a layer of first natural diamond is laid to form the second particle layer, where there is a uniform void between any two adjacent second wear-resistant TSPs or between any two adjacent first natural diamonds, and the void is filled with the two adjacent layers of the second mixed powder due to gravity, and the orthographic projections of all the second wear-resistant TSPs and first natural diamonds cover the powder distribution plane of the second mixed powder; or

[0076] Between any two adjacent layers of the second mixed powder, a layer of second wear-resistant TSP or a layer of coarse-grained diamond single crystal or a layer of first natural diamond is laid to form the second particle layer, where there is a uniform void between any two adjacent second wear-resistant TSPs or between any two adjacent coarse-grained diamond single crystals or between any two adjacent first natural diamonds, and the void is filled with the two adjacent layers of the second mixed powder due to gravity, and the orthographic projections of all the second wear-resistant TSPs, coarse-grained diamond single crystals, and first natural diamonds cover the powder distribution plane of the second mixed powder; or

[0077] Between any two adjacent layers of the first matrix powder, a layer of second wear-resistant TSP or a layer of coarse-grained diamond single crystals is laid to form the third particle layer. Among them, there are uniform gaps between any two adjacent second wear-resistant TSPs or any two adjacent coarse-grained diamond single crystals, and the gaps are filled by the two adjacent layers of the first matrix powder due to gravity. The orthographic projections of all the second wear-resistant TSPs and coarse-grained diamond single crystals cover the powder distribution plane of the first matrix powder; or

[0078] Between any two adjacent layers of the first matrix powder, a layer of second wear-resistant TSP or a layer of first natural diamond is laid to form the third particle layer. Among them, there are uniform gaps between any two adjacent second wear-resistant TSPs or any two adjacent first natural diamonds, and the gaps are filled by the two adjacent layers of the first matrix powder due to gravity. The orthographic projections of all the second wear-resistant TSPs and first natural diamonds cover the powder distribution plane of the first matrix powder; or

[0079] Between any two adjacent layers of the first matrix powder, a layer of second wear-resistant TSP or a layer of coarse-grained diamond single crystals or a layer of first natural diamond is laid to form the third particle layer. Among them, there are uniform gaps between any two adjacent second wear-resistant TSPs or any two adjacent coarse-grained diamond single crystals or any two adjacent first natural diamonds, and the gaps are filled by the two adjacent layers of the first matrix powder due to gravity. The orthographic projections of all the second wear-resistant TSPs, coarse-grained diamond single crystals, and first natural diamonds cover the powder distribution plane of the first mixed powder.

[0080] According to a specific embodiment of the present invention, the orderly arrangement is realized by a device with holes (such as a sieve).

[0081] According to a specific embodiment of the present invention, the thickness of the first mixed powder distribution in step (2) and the thickness of the first mixed powder distribution in step (4) are independently 1 to 3 mm; and / or

[0082] In step (4), the number of cycles of steps (2) and (3) is 1 to 10.

[0083] According to a specific embodiment of the present invention, the thickness of the second mixed powder distribution in step B and the thickness of the second mixed powder distribution in step D are independently 1 to 3 mm; and / or

[0084] In step D, the number of cycles of steps B and C is 1 to 10.

[0085] According to a specific embodiment of the present invention, the thickness of the matrix powder distribution in step (a) and the thickness of the matrix powder distribution in step (c) are independently 1 to 3 mm; and / or

[0086] In step (c), the number of cycles of steps (a) and (b) is from 1 to 10.

[0087] According to a specific embodiment of the present invention, the thickness of the raw material layer is 1 to 20 mm; and / or

[0088] The sintering conditions are a temperature of 670 to 940 °C, a pressure of 200 kN, and a time of 10 min.

[0089] In the present invention, the size of the speed-up impregnated diamond block is usually at the centimeter level (for example, 1 cm and 1.3 cm); the shape of the speed-up impregnated diamond block can be determined according to actual needs, including but not limited to shapes such as cylinders, rhombuses, cubes, cuboids, etc., or combinations of different shapes.

[0090] According to a specific embodiment of the present invention, the main body part is obtained by sintering the second matrix powder and a steel core; and / or

[0091] The crown surface layer further includes a third matrix powder 6-2.

[0092] According to a specific embodiment of the present invention, the crown surface layer further includes a second diamond 6-3.

[0093] According to a specific embodiment of the present invention, a mixture of the first wear-resistant TSP and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer; or

[0094] The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed in the crown surface layer; or

[0095] The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is randomly distributed at the drilling front of the crown surface layer; or

[0096] The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed at the drilling front of the crown surface layer;

[0097] Preferably, the longitudinal spacing between any two adjacent first wear-resistant TSPs is not less than 0.5 mm, and the transverse spacing is not less than 0.5 mm.

[0098] According to a specific embodiment of the present invention, a mixture of the first wear-resistant TSP, the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer; or

[0099] The mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed in the crown surface layer; or

[0100] The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are orderly distributed in the crown surface layer; or

[0101] The mixture of the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are randomly distributed at the drilling front of the crown surface layer; or

[0102] The mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed at the drilling front of the crown surface layer; or

[0103] The mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is randomly distributed at the drilling front of the crown surface layer; or

[0104] The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are orderly distributed at the drilling front of the crown surface layer;

[0105] Preferably, the longitudinal spacing between any two adjacent first wear-resistant TSPs and / or second diamonds is not less than 0.5 mm, and the transverse spacing is not less than 0.5 mm.

[0106] In the present invention, the orderly distribution of the first wear-resistant TSP means that the longitudinal spacing between any two adjacent first wear-resistant TSPs is not less than 0.5 mm, and the transverse spacing is not less than 0.5 mm. The transverse spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs can be adjusted within the above range according to actual needs. The transverse spacing and the longitudinal spacing can be equal or unequal, but the upper limit of the transverse spacing and the longitudinal spacing generally does not exceed the particle size of the first wear-resistant TSP.

[0107] In the present invention, the orderly distribution of the first wear-resistant TSPs and the second diamonds means that the lateral spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs, any two adjacent second diamonds, and any two adjacent first wear-resistant TSPs and second diamonds are not less than 0.5 mm. The lateral spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs, any two adjacent second diamonds, and any two adjacent first wear-resistant TSPs and second diamonds can be adjusted within the above range according to actual needs. The lateral spacing and the longitudinal spacing can be equal or unequal, but generally, the upper limit of the lateral spacing and the longitudinal spacing does not exceed the particle size of the first wear-resistant TSPs and the second diamonds.

[0108] In the present invention, the drilling front of the crown surface layer refers to the area that first contacts the rock when the impregnated diamond bit drills the rock. When the first wear-resistant TSPs (or the first wear-resistant TSPs and the second diamonds) are distributed in the crown surface layer, it is understood that the first wear-resistant TSPs (or the first wear-resistant TSPs and the second diamonds) are distributed in the entire thickness direction of the crown surface layer. When the first wear-resistant TSPs (or the first wear-resistant TSPs and the second diamonds) are orderly distributed (or randomly distributed) at the drilling front of the crown surface layer, it is understood that in the thickness direction of the crown surface layer, the distribution of the first wear-resistant TSPs (or the first wear-resistant TSPs and the second diamonds) is more biased towards the side of the drilling front, and there is no distribution of the first wear-resistant TSPs (or the first wear-resistant TSPs and the second diamonds) on the side away from the drilling front in the thickness direction of the crown surface layer.

[0109] According to a specific embodiment of the present invention, the thickness of the crown surface layer is 6 to 30 mm.

[0110] According to a specific embodiment of the present invention, the wear ratio of the first wear-resistant TSPs and the second wear-resistant TSPs is independently not less than 400,000; and / or

[0111] The equal-volume equivalent spherical diameter of the first wear-resistant TSPs and the second wear-resistant TSPs is independently 0.5 to 5 mm; and / or

[0112] The particle size of the second diamonds is 0.5 to 3 mm.

[0113] According to a specific embodiment of the present invention, the second diamonds include first diamond single crystals and / or third natural diamonds.

[0114] According to a specific embodiment of the present invention, the impregnated diamond bit further includes a sub 7 and a core hole 8; and / or

[0115] The bit body further includes a gauge body 9, a flow channel 10, and a nozzle 11;

[0116] Preferably, the gauge body is sintered from a fourth matrix powder; and / or

[0117] The gauge body is inlaid with TSP 9-1, third diamond 9-2 and gauge impregnated diamond block 9-3;

[0118] Preferably, the particle size of the TSP 9-1 is 1 to 20 mm; and / or the particle size of the third diamond is 0.5 to 3 mm; and / or

[0119] The size of the gauge impregnated diamond block is at the centimeter level (for example, 1 cm and 1.3 cm).

[0120] Preferably, the third diamond is a second single crystal diamond.

[0121] According to a specific embodiment of the present invention, a PDC composite sheet is further arranged at the center of the crown of the drill bit body;

[0122] Preferably, the size of the PDC composite sheet is not less than 8 mm (for example, 8 to 19 mm).

[0123] Advantages of the present invention:

[0124] Aimed at the problems of low drilling speed and small footage in the existing impregnated diamond bits, the present invention provides an impregnated diamond bit. The most prominent improvement of the impregnated diamond bit provided by the present invention compared with the existing impregnated diamond bits lies in that: the impregnated diamond bit provided by the present invention is added with the wear-resistant TSP prepared by the present invention and the speed-up impregnated diamond blocks containing the wear-resistant TSP. The wear-resistant TSP has good wear resistance and acceptable high-temperature resistance at the same time. Its wear ratio can reach more than 400,000, and the graphitization temperature can reach more than 800 °C. Combining the design of ratio regulation and raw material assembly method, the speed-up impregnated diamond blocks have excellent wear resistance, and the highest wear ratio can reach 900, and also have good wear resistance, laying a foundation for the improvement of the rotation speed and the increase of the footage of the impregnated diamond bit. During the drilling process of the impregnated diamond bit, due to the second wear-resistant TSP in the speed-up impregnated diamond blocks arranged on the cutter wings of the impregnated diamond bit, its particle size is much larger than that of diamond single crystals and natural diamonds, so it has a higher exposure height in the speed-up impregnated diamond blocks. Combining with high wear resistance, the second wear-resistant TSP forms cutting rock breaking during the drilling process of the impregnated diamond bit, cutting deeper grooves in the formation. On the one hand, it releases the formation stress, so that the strength of the protruding formation rock drops significantly due to the reduction of the formation stress, enhancing the drillability of the formation; on the other hand, the coarser-grained second wear-resistant TSP generates cracks and micro-cracks in the formation during the process of cutting the formation, which will further enhance the drillability of the formation. At this time, the first diamond with a particle size smaller than that of the second wear-resistant TSP in the speed-up impregnated diamond blocks arranged on the cutter wings breaks the rock in the form of plowing, scratching and grinding on the rock with enhanced drillability after being cut by the second wear-resistant TSP. Since the drillability of the rock has been enhanced after being cut by the second wear-resistant TSP, the rotation speed of the impregnated diamond bit will be greatly increased when the cutting rock breaking of the second wear-resistant TSP is combined with the plowing, scratching and grinding of the first diamond; at the same time, these finer-grained first diamonds themselves are also protected due to the improvement of the drillability of the rock by the second wear-resistant TSP, which is beneficial to increasing the footage of the impregnated diamond bit. Secondly, the crown surface of the bit body is preferably added with the second diamond while adding the first wear-resistant TSP. During the drilling process, when the crown surface contacts the formation, similar to the speed-up impregnated diamond blocks arranged on the cutter wings, the larger-grained first wear-resistant TSP first cuts the formation, releases the formation stress and generates cracks and micro-cracks in the formation, enhancing the drillability of the formation. The lower-grained second diamond breaks the rock with enhanced drillability in the formation in the form of plowing, scratching and grinding, combining cutting and plowing, scratching and grinding again, further increasing the drilling speed on the basis of the speed-up impregnated diamond blocks arranged on the cutter wings, protecting the second diamond and increasing the footage.Furthermore, the present invention preferably arranges the second wear-resistant TSP, the first natural diamond and the coarse-grained diamond single crystal in the speed-up impregnated diamond blocks in an orderly manner, and preferably distributes the first wear-resistant TSP and the second diamond in the crown surface layer, which is beneficial to ensuring the steady increase of the drilling speed and footage of the impregnated diamond bit during the drilling process, and is also beneficial to improving the stability of the entire drilling process of the formation. The impregnated diamond bit provided by the present invention is also preferably provided with a PDC composite sheet at one end of the cutter wing close to the center of the bit to avoid the phenomenon of core-pulling during the drilling process. The present invention also preferably sets the crown of the impregnated diamond bit to a stable B-type profile and sets a smaller inner cone angle, which, together with the gauge body inlaid with the third diamond, TSP (preferably the wear-resistant TSP prepared by the present invention) and gauge impregnated diamond blocks at intervals at the end of the cutter wing extending laterally, jointly enhances the stability of the entire impregnated diamond bit during the drilling process. Based on the above design, compared with the impregnated diamond bit in the prior art that does not add TSP and only adds diamond single crystals, the mechanical rotation speed of the impregnated diamond bit provided by the present invention is increased by nearly 60%, and the footage is increased by 65%. It is an impregnated diamond bit with a high mechanical rotation speed and a large footage, and can achieve high drilling speed, large footage, high efficiency, low bit loss and low cost in oil and gas drilling and geological exploration. BRIEF DESCRIPTION OF THE DRAWINGS

[0125] Figure 1 is a schematic structural diagram of a polycrystalline diamond composite sheet, where a represents the polycrystalline diamond layer and b represents the cemented carbide layer;

[0126] Figure 2 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 1, where c represents the non-cobalt removal area;

[0127] Figure 3 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 2, where c represents the non-cobalt removal area and d represents the cobalt removal area;

[0128] Figure 4 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 3, where d represents the cobalt removal area;

[0129] Figure 5 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 4, where c represents the non-cobalt removal area and e represents the nickel plating layer;

[0130] Figure 6 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 5, where c represents the non-cobalt removal area, d represents the cobalt removal area, and f represents the titanium plating layer;

[0131] Figure 7 is a schematic internal structure diagram of the wear-resistant TSP prepared in Example 6, where d represents the cobalt removal area and f represents the titanium plating layer;

[0132] Figure 8 Scanning electron microscope image of the wear-resistant TSP prepared in Example 2;

[0133] Figure 9 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in any one of Examples 14, 17, and 20, where i is the first mixed powder, j is the triangular pyramid-shaped wear-resistant TSP, and the dotted lines are all powder spreading planes;

[0134] Figure 10 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 15 or 18, where i is the first mixed powder, k is the cube-shaped wear-resistant TSP, and the dotted lines are all powder spreading planes;

[0135] Figure 11 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 16 or 19, where i is the first mixed powder, m is the cylinder-shaped wear-resistant TSP, and the dotted lines are all powder spreading planes;

[0136] Figure 12 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 21, where j is the triangular pyramid-shaped wear-resistant TSP, n is the matrix powder, p is the coarse-grained diamond single crystal, and the dotted lines are all powder spreading planes;

[0137] Figure 13 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 22, where k is the cube-shaped wear-resistant TSP, n is the matrix powder, r is the first natural diamond, and the dotted lines are all powder spreading planes;

[0138] Figure 14 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 23, where m is the cylinder-shaped wear-resistant TSP, n is the matrix powder, p is the coarse-grained diamond single crystal, r is the first natural diamond, and the dotted lines are all powder spreading planes;

[0139] Figure 15 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 24, where j is the triangular prism-shaped wear-resistant TSP, p is the coarse-grained diamond single crystal, u is the second mixed powder, and the dotted lines are all powder spreading planes;

[0140] Figure 16 Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 25, where k is the cube-shaped wear-resistant TSP, u is the second mixed powder, r is the first natural diamond, and the dotted lines are all powder spreading planes;

[0141] Figure 17Schematic diagram of the internal structure of the speed-up impregnated diamond block prepared in Example 26, where m is a cylindrical wear-resistant TSP, p is a coarse-grained diamond single crystal, r is the first natural diamond, u is the second mixed powder, and the dotted lines are all powder distribution planes;

[0142] Figure 18 Schematic diagram of the structure of the impregnated diamond bit provided by the present invention, where 1-bit body, 2-speed-up impregnated diamond block, 3-crown, 4-blade, 5-main body part, 6-crown surface layer, 6-1-first wear-resistant TSP, 7-joint, 8-core hole, 9-gauge body, 9-1-TSP, 9-2-third diamond, 9-3-gauge impregnated diamond block, 10-flow channel, 11-nozzle;

[0143] Figures 19 to 22 Schematic diagrams of the crown surface layer 6 of the impregnated diamond bits provided in Examples 27 to 30 in sequence, where 6-1-first wear-resistant TSP, 6-2-third matrix powder;

[0144] Figures 23 to 29 Schematic diagrams of the crown surface layer 6 of the impregnated diamond bits provided in Examples 31 to 37 in sequence, where 6-1-first wear-resistant TSP, 6-2-third matrix powder, 6-3-second diamond.

[0145] It should be noted that Figures 1 to 7 , 9 to 29 are all schematic diagrams and are not drawn according to the actual size and ratio. Detailed implementation mode

[0146] The present invention will be further described below in conjunction with examples, but the examples of the present invention are only exemplary descriptions, and this implementation mode does not constitute a limitation to the present invention under any circumstances.

[0147] Preparation of wear-resistant TSP

[0148] In the following examples, the structure of the polycrystalline diamond compact used to prepare the wear-resistant TSP is as Figure 1 shown. Specifically, its specifications are: polycrystalline diamond 1613, its diameter is 13 mm high, and the abrasion ratio is 1 million.

[0149] In the following examples, the formula of the cobalt stripping solution used to prepare the wear-resistant TSP is as follows:

[0150] Cobalt stripping solution 1: Taking the mass of cobalt stripping solution 1 as 100%, cobalt stripping solution 1 includes 1 wt% sulfuric acid, 15 wt% ferric chloride, 2 wt% sodium dihydrogen phosphate, and the balance of water;

[0151] Decobalt solution 2: Taking the mass of decobalt solution 2 as 100%, decobalt solution 2 comprises 2 wt% sulfuric acid, 18 wt% ferric chloride, 3.5 wt% potassium dihydrogen phosphate and the balance water;

[0152] Decobalt solution 3: Taking the mass of decobalt solution 3 as 100%, decobalt solution 3 comprises 3 wt% sulfuric acid, 20 wt% ferric chloride, 5 wt% sodium dihydrogen phosphate and the balance water.

[0153] Example 1

[0154] 1) Cut off the cemented carbide layer in the polycrystalline diamond composite sheet, and retain the polycrystalline diamond layer;

[0155] 2) By wire cutting, cut the polycrystalline diamond layer retained in step 1) into a triangular pyramid to obtain a triangular pyramid-shaped wear-resistant TSP, whose equivalent spherical diameter by volume is 3 mm, and the internal structure schematic diagram is Figure 2 .

[0156] Example 2

[0157] 1) Cut off the cemented carbide layer in the polycrystalline diamond composite sheet, and retain the polycrystalline diamond layer;

[0158] 2) By wire cutting, cut the polycrystalline diamond layer retained in step 1) into a cube, then place it in a sealed container, add sufficient decobalt solution 1 to submerge the polycrystalline diamond, and perform cyclic decobalt. After each decobalt, observe the decobalt depth under a scanning electron microscope until the decobalt depth reaches 600 μm and the decobalt rate is 98% to obtain a cube-shaped wear-resistant TSP, whose equivalent spherical diameter by volume is 3 mm, and the internal structure schematic diagram is Figure 3 .

[0159] Example 3

[0160] 1) Cut off the cemented carbide layer in the polycrystalline diamond composite sheet, and retain the polycrystalline diamond layer;

[0161] 2) By wire cutting, cut the polycrystalline diamond layer retained in step 1) into a cylinder, then place it in a sealed container, add sufficient decobalt solution 2 to submerge the polycrystalline diamond, and perform cyclic decobalt. After each decobalt, observe the decobalt depth under a scanning electron microscope until the decobalt depth reaches 1000 μm and the decobalt rate is 100% to obtain a cylinder-shaped wear-resistant TSP, whose equivalent spherical diameter by volume is 3 mm, and the internal structure schematic diagram is Figure 4 .

[0162] Example 4

[0163] 1) Cut off the cemented carbide layer in the polycrystalline diamond composite sheet, and retain the polycrystalline diamond layer;

[0164] 2) By wire cutting, the polycrystalline diamond layer retained in step 1) is cut into a triangular pyramid, and then a nickel coating is deposited on its surface by vacuum plating to obtain a triangular pyramid-shaped wear-resistant TSP with a nickel coating on its surface. Its equivalent spherical diameter by volume is 3 mm, the thickness of the nickel coating is 3 μm, and the internal structure schematic diagram is Figure 5 .

[0165] Example 5

[0166] 1) Remove the cemented carbide layer in the polycrystalline diamond composite sheet and retain the polycrystalline diamond layer;

[0167] 2) By wire cutting, the polycrystalline diamond layer retained in step 1) is cut into a cube, and then placed in a sealed container. Sufficient decobalt solution 3 is added to submerge the polycrystalline diamond, and cyclic decobalt is carried out. After each decobalt, the decobalt depth is observed under a scanning electron microscope until the decobalt depth reaches 800 μm and the decobalt rate is 99%, obtaining partially decobaltized polycrystalline diamond;

[0168] 3) By vacuum plating, a titanium coating is deposited on the surface of the partially decobaltized polycrystalline diamond obtained in step 2) to obtain a cube-shaped wear-resistant TSP with a titanium coating on its surface. Its equivalent spherical diameter by volume is 3 mm, the thickness of the titanium coating is 3 μm, and the internal structure schematic diagram is Figure 6 .

[0169] Example 6

[0170] 1) Remove the cemented carbide layer in the polycrystalline diamond composite sheet and retain the polycrystalline diamond layer;

[0171] 2) By wire cutting, the polycrystalline diamond layer retained in step 1) is cut into a cylinder, and then placed in a sealed container. Sufficient decobalt solution 2 is added to submerge the polycrystalline diamond, and cyclic decobalt is carried out. After each decobalt, the decobalt depth is observed under a scanning electron microscope until the decobalt depth reaches 1000 μm and the decobalt rate is 100%, obtaining fully decobaltized polycrystalline diamond;

[0172] 3) By vacuum plating, a titanium coating is deposited on the surface of the fully decobaltized polycrystalline diamond obtained in step 2) to obtain a cylinder-shaped wear-resistant TSP with a titanium coating on its surface. Its equivalent spherical diameter by volume is 3 mm, the thickness of the titanium coating is 3 μm, and the internal structure schematic diagram is Figure 7 .

[0173] Comparative Example 1

[0174] A generally commercially available TSP, with specifications of (i.e., diameter 3 mm, height 6 mm).

[0175] Comparative Example 2

[0176] A generally commercially available PDC, with the specification of (i.e., with a diameter of 16 mm and a height of 13 mm);

[0177] It should be noted that this generally commercially available PDC used in this comparative example only has the same size as the PDCs used in Examples 1 to 6, and there are differences in wear ratios. For specific wear ratio information, see the wear-resistant TSP evaluation section.

[0178] Wear-resistant TSP evaluation

[0179] 1. Wear-resistant TSP cobalt removal inspection

[0180] In the process of preparing wear-resistant TSP in Examples 1 and 4, the cobalt removal step is not involved. Therefore, the wear-resistant TSPs prepared in Examples 2, 3, 5, and 6 are taken, and the cobalt removal conditions of these 4 kinds of wear-resistant TSPs are observed by using a scanning electron microscope. Here, the wear-resistant TSP prepared in Example 2 is taken as an example for detailed description.

[0181] Figure 8 Figure is the scanning electron microscope image of the wear-resistant TSP prepared in Example 2. It is measured that the cobalt removal depth of the triangular pyramid-shaped wear-resistant TSP prepared in Example 2 reaches 600 μm, and partial cobalt removal is completed in some areas of the TSP, which is partial cobalt removal.

[0182] Similarly, the wear-resistant TSPs prepared in Examples 3, 5, and 6 are observed by using a scanning electron microscope. It can be observed that cobalt removal is completed in the entire TSP area of the wear-resistant TSP prepared in Example 3, partial cobalt removal is completed in some TSP areas of the wear-resistant TSP prepared in Example 5, and cobalt removal is completed in the entire TSP area of the wear-resistant TSP prepared in Example 6. It is measured that the cobalt removal depths of the wear-resistant TSPs prepared in Examples 3, 5, and 6 reach 1000 μm, 800 μm, and 1000 μm in sequence.

[0183] 2. Wear-resistant TSP performance evaluation

[0184] ⅰ Wear resistance evaluation

[0185] The wear resistance of the wear-resistant TSPs with different shapes prepared in Examples 1 to 6, the TSP provided in Comparative Example 1, and the PDC provided in Comparative Example 2 is measured. The specific measurement method refers to the regulations in JB3235-83 "Determination Method for Wear Ratio of Sintered Body of Synthetic Diamond". The evaluation results are shown in Table 1.

[0186] ⅱ Temperature resistance evaluation

[0187] The temperature resistance of the wear-resistant TSPs prepared in Examples 1 to 6, the TSP provided in Comparative Example 1, and the PDC provided in Comparative Example 2 is measured. The specific measurement method refers to the regulations in Q / DHMR001-2016 "Diamond / Cemented Carbide Composite Sheet". The evaluation results are shown in Table 1.

[0188] Table 1. Wear resistance and temperature resistance of wear-resistant TSP

[0189] Serial number Wear ratio Graphitization temperature Example 1 1 million 820℃ Example 2 1.5 million 850℃ Example 3 1.2 million 830℃ Example 4 1.5 million 850℃ Example 5 1.3 million 890℃ Example 6 1.5 million 890℃ Comparative example 1 0.08 million 1200℃ Comparative example 2 0.8 million 750℃

[0190] The wear ratio data in Table 1 show that the wear ratios of the wear-resistant TSPs prepared in Examples 1 to 6 are 1 million to 1.5 million, which are 12.5 to 18.8 times that of Comparative Example 1 and 1.3 to 1.9 times that of Comparative Example 2. The wear resistance is slightly higher than that of the PDC provided in Comparative Example 2 and much higher than that of the TSP provided in Comparative Example 1, proving that the wear-resistant TSP prepared by the process provided by the present invention has good wear resistance. The graphitization temperature data in Table 1 show that the graphitization temperatures of the wear-resistant TSPs prepared in Examples 1 to 6 are 820 °C to 890 °C. Although the temperature resistance is lower than that of the TSP provided in Comparative Example 1, it is much higher than that of the PDC provided in Comparative Example 2, proving that the wear-resistant TSP prepared by the process provided by the present invention has acceptable temperature resistance.

[0191] The above evaluation results show that: the wear-resistant TSP prepared by the preparation process provided by the present invention overcomes the problem that traditional TSP or PDC in the prior art cannot simultaneously have good temperature resistance and wear resistance. While maintaining acceptable temperature resistance, good wear resistance is achieved, and it can be used as the cutting element material and wear-resistant element material of diamond bits.

[0192] Preparation of speed-up impregnated diamond blocks

[0193] The molds used in Examples 7 to 26 for preparing speed-up impregnated diamond blocks and their assembly belong to the prior art known to those skilled in the art and will not be elaborated here. The wear ratios of the speed-up impregnated diamond blocks prepared in Examples 7 to 26 were measured in accordance with the regulations in JB3235-83 "Determination Method for Wear Ratio of Synthetic Diamond Sintered Bodies".

[0194] The first matrix powder used in Examples 7 to 26: Taking the mass of the first matrix powder as 100%, the first matrix powder includes 60 wt% tungsten carbide powder (average particle size of 100 μm), 10 wt% nickel powder (average particle size of 100 μm), 5 wt% cobalt powder (average particle size of 20 μm), and 25 wt% copper-based alloy powder (average particle size of 45 μm).

[0195] Example 7

[0196] Weigh 3 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 1), 5 g of coarse-grained diamond single crystals with an average particle size of 550 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm. Assemble the mold and hot press sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 102, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0197] Example 8

[0198] Weigh 3 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 2), 5 g of fine-grained diamond single crystals with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm. Assemble the mold and hot press sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 480, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0199] Example 9

[0200] Weigh 3 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 3), 3 g of coarse-grained diamond single crystals with an average particle size of 550 μm, 2 g of second natural diamonds with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm. Assemble the mold and hot press sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 260, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0201] Example 10

[0202] Weigh 3 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 4), 3 g of fine-grained diamond single crystals with an average particle size of 300 μm, 2 g of second natural diamonds with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm. Assemble the mold and hot press sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 500, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0203] Example 11

[0204] Weigh 3 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 5), 3 g of coarse diamond single crystals with an average particle size of 550 μm, 2 g of fine diamond single crystals with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm; Assemble the mold and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 340, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. for use as needed.

[0205] Example 12

[0206] Weigh 3 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 6), 5 g of second natural diamonds with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm; Assemble the mold and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 450, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. for use as needed.

[0207] Example 13

[0208] Weigh 3 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 1), 3 g of coarse diamond single crystals with an average particle size of 550 μm, 1 g of fine diamond single crystals with an average particle size of 300 μm, 1 g of second natural diamonds with an average particle size of 300 μm, and 40 g of the first matrix powder. Mix them evenly, then spread the powder in a mold and press to obtain a raw material layer with a thickness of 20 mm; Assemble the mold and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block with a wear ratio of 150, which can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. for use as needed.

[0209] Example 14

[0210] (1) Weigh 5 g of coarse diamond single crystals with an average particle size of 550 μm and 40 g of the first matrix powder, mix them evenly to obtain the first mixed powder;

[0211] (2) Use 45 g of the first mixed powder to spread the powder in a mold, and the powder spreading thickness is 3 mm;

[0212] (3) Arrange 1 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 1) in an orderly manner on the first mixed powder after powder spreading in the pattern of "particle, void, particle", with a uniform void between any two adjacent triangular pyramid-shaped wear-resistant TSPs, forming a first particle layer;

[0213] (4) Repeat steps (2) and (3) three times. Finally, spread 37.5 g of the first mixed powder on the first particle layer, with a powder spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent triangular pyramid-shaped wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged triangular pyramid-shaped wear-resistant TSPs form a three-dimensional cross-covering arrangement;

[0214] (5) Assemble the mold, and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block, the internal structure schematic diagram of which is Figure 9 , and its wear ratio is 520. It can be cut into various shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0215] Example 15

[0216] (1) Weigh 5 g of fine-grained diamond single crystals with an average particle size of 300 μm and 40 g of the first matrix powder, and mix them evenly to obtain the first mixed powder;

[0217] (2) Spread 45 g of the first mixed powder in the mold, with a powder spreading thickness of 3 mm;

[0218] (3) Then arrange 1 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 2) in an orderly manner on the first mixed powder after powder spreading in the pattern of "particle, void, particle", with a uniform void between any two adjacent cube-shaped wear-resistant TSPs, forming a first particle layer;

[0219] (4) Repeat steps (2) and (3) three times. Finally, spread 37.5 g of the first mixed powder on the first particle layer, with a powder spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cube-shaped wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged cube-shaped wear-resistant TSPs form a three-dimensional cross-covering arrangement;

[0220] (5) Assemble the mold, and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block, the internal structure schematic diagram of which is Figure 10, with a wear ratio of 600, can be cut into shapes or combinations of shapes as needed, including but not limited to cylinders, rhombuses, cubes, cuboids, etc.

[0221] Example 16

[0222] (1) Weigh 3 g of coarse-grained diamond single crystals with an average particle size of 550 μm, 2 g of fine-grained diamond single crystals with an average particle size of 300 μm, and 40 g of the first matrix powder, and mix them evenly to obtain the first mixed powder.

[0223] (2) Use 45 g of the first mixed powder to powder the mold, and the powdering thickness is 3 mm.

[0224] (3) Then arrange 1 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 3) in an orderly manner on the first mixed powder after powdering according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent cylindrical wear-resistant TSPs to form the first particle layer.

[0225] (4) Repeat steps (2) and (3) three times. Finally, powder the first particle layer with 37.5 g of the first mixed powder, and the powdering thickness is 2.5 mm. Press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cylindrical wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged cylindrical wear-resistant TSPs are arranged in a three-dimensional cross-covering layout.

[0226] (5) Assemble the mold, and hot-press and sinter at 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, and its internal structure schematic diagram is Figure 11 , with a wear ratio of 560, can be cut into shapes or combinations of shapes as needed, including but not limited to cylinders, rhombuses, cubes, cuboids, etc.

[0227] Example 17

[0228] (1) Weigh 5 g of the second natural diamond with an average particle size of 300 μm and 40 g of the first matrix powder, and mix them evenly to obtain the first mixed powder.

[0229] (2) Use 45 g of the first mixed powder to powder the mold, and the powdering thickness is 3 mm.

[0230] (3) Arrange 3 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 4) in an orderly manner on the first mixed powder after powdering according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent triangular pyramid-shaped wear-resistant TSPs to form the first particle layer.

[0231] (4) Repeat steps (2) and (3) three times. Spread 37.5 g of the first mixed powder on the first particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent triangular pyramid-shaped wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged triangular pyramid-shaped wear-resistant TSPs form a three-dimensional cross-covering layout;

[0232] (5) Assemble the mold, hot press and sinter at 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block. The schematic diagram of its internal structure is Figure 9 , and its abrasion ratio is 630. It can be cut into various shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0233] Example 18

[0234] (1) Weigh 3 g of coarse diamond single crystals with an average particle size of 550 μm, 2 g of second natural diamonds with an average particle size of 300 μm, and 40 g of the first matrix powder, and mix them evenly to obtain the first mixed powder;

[0235] (2) Spread 45 g of the first mixed powder in the mold with a spreading thickness of 3 mm;

[0236] (3) Arrange 1 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 5) in an orderly manner on the first mixed powder after spreading according to the pattern of "particle, gap, particle". There is a uniform gap between any two adjacent cube-shaped wear-resistant TSPs to form the first particle layer;

[0237] (4) Repeat steps (2) and (3) three times. Finally, spread 37.5 g of the first mixed powder on the first particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent cube-shaped wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged cube-shaped wear-resistant TSPs form a three-dimensional cross-covering layout;

[0238] (5) Assemble the mold, hot press and sinter at 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block. The schematic diagram of its internal structure is Figure 10 , and its abrasion ratio is 590. It can be cut into various shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0239] Example 19

[0240] (1) Weigh 3 g of fine-grained diamond single crystals with an average particle size of 300 μm, 2 g of second natural diamonds with an average particle size of 300 μm, and 40 g of first matrix powder, and mix them evenly to obtain the first mixed powder;

[0241] (2) Use 45 g of the first mixed powder to powder in a mold, and the powder thickness is 3 mm;

[0242] (3) Arrange 1 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 6) in an orderly manner on the first mixed powder after powdering according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent cylindrical wear-resistant TSPs to form the first particle layer;

[0243] (4) Repeat steps (2) and (3) three times, and finally powder 37.5 g of the first mixed powder on the first particle layer, and the powder thickness is 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cylindrical wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged cylindrical wear-resistant TSPs are arranged in a three-dimensional cross-covering layout;

[0244] (5) Assemble the mold, and hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, and its internal structure schematic diagram is Figure 11 , and its wear ratio is 650, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0245] Example 20

[0246] (1) Weigh 1.5 g of fine-grained diamond single crystals with an average particle size of 300 μm, 2 g of coarse-grained diamond single crystals with an average particle size of 550 μm, 1.5 g of second natural diamonds with an average particle size of 300 μm, and 40 g of first matrix powder, and mix them evenly to obtain the first mixed powder;

[0247] (2) Use 45 g of the first mixed powder to powder in a mold, and the powder thickness is 3 mm;

[0248] (3) Arrange 1 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 1) in an orderly manner on the first mixed powder after powdering according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent triangular pyramid-shaped wear-resistant TSPs to form the first particle layer;

[0249] (4) Repeat steps (2) and (3) three times. Finally, spread 37.5 g of the first mixed powder on the first particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent triangular pyramid-shaped wear-resistant TSPs are filled with the first mixed powder, and the orderly arranged triangular pyramid-shaped wear-resistant TSPs form a three-dimensional cross-overlay arrangement;

[0250] (5) Assemble the mold, and hot press and sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block. The schematic diagram of its internal structure is Figure 9 , and its abrasion ratio is 545. It can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. for use as needed.

[0251] Example 21

[0252] (a) Weigh 40 g of the first matrix powder, spread it in the mold with a spreading thickness of 3 mm;

[0253] (b) Arrange 1 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 1) on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, gap, particle", and there is a uniform gap between any two adjacent triangular pyramid-shaped wear-resistant TSPs;

[0254] Weigh 40 g of the first matrix powder and spread it with a spreading thickness of 3 mm; Arrange 1.5 g of coarse-grained diamond single crystals with an average particle size of 550 μm on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, gap, particle", and there is a uniform gap between any two adjacent coarse-grained diamond single crystals to obtain the third particle layer;

[0255] (c) Repeat steps (a) and (b) three times. Finally, spread 33.3 g of the first matrix powder on the third particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent triangular pyramid-shaped wear-resistant TSPs and the gaps between any two adjacent coarse-grained diamond single crystals are filled with the first matrix powder, and the orderly arranged triangular pyramid-shaped wear-resistant TSPs and coarse-grained diamond single crystals form a three-dimensional cross-overlay arrangement;

[0256] (d) Assemble the mold, and hot press and sinter at 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block. The schematic diagram of its internal structure is Figure 12 , and its abrasion ratio is 755. It can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. for use as needed.

[0257] Example 22

[0258] (a) Weigh 40 g of the first matrix powder and spread it in a mold with a spreading thickness of 3 mm;

[0259] (b) Arrange 1 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 2) on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent cube-shaped wear-resistant TSPs;

[0260] Weigh 40 g of the first matrix powder and spread it with a spreading thickness of 3 mm; Arrange 1.5 g of the first natural diamond with an average particle size of 550 μm on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent first natural diamonds to obtain the third particle layer;

[0261] (c) Repeat steps (a) and (b) three times, and finally spread 33.3 g of the first matrix powder on the third particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cube-shaped TSPs and the voids between any two adjacent first natural diamonds are filled with the first matrix powder, and the orderly arranged cube-shaped wear-resistant TSPs and first natural diamonds are arranged in a three-dimensional cross-covering layout;

[0262] (d) Assemble the mold, hot press and sinter at a temperature of 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, the internal structure schematic diagram of which is Figure 13 , and its wear ratio is 900, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0263] Example 23

[0264] (a) Weigh 40 g of the first matrix powder and spread it in a mold with a spreading thickness of 3 mm;

[0265] (b) Then arrange 1 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 3) on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent cylindrical wear-resistant TSPs;

[0266] Weigh 40 g of the first matrix powder and spread it with a spreading thickness of 3 mm; Arrange 1 g of coarse-grained diamond single crystals with an average particle size of 550 μm on the first matrix powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent coarse-grained diamond single crystals;

[0267] Weigh 40 g of the first matrix powder for powder spreading, and the powder spreading thickness is 3 mm; Arrange 0.5 g of the first natural diamond with an average particle size of 550 μm in an orderly manner on the first matrix powder after powder spreading according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent first natural diamonds, obtaining the third particle layer;

[0268] (c) Repeat steps (a) and (b) three times. Finally, powder spread 33.3 g of the first matrix powder on the third particle layer, and the powder spreading thickness is 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cylindrical wear-resistant TSPs, the voids between any two adjacent coarse-grained diamond single crystals, and the voids between any two adjacent first natural diamonds are filled with the first matrix powder, and the orderly arranged cylindrical wear-resistant TSPs, coarse-grained diamond single crystals, and first natural diamonds are arranged in a three-dimensional cross-covering layout;

[0269] (d) Assemble the mold, and perform hot pressing and sintering at a temperature of 880 °C and a pressure of 200 kN for 10 min, then clean and trim to obtain a speed-up impregnated diamond block, and its internal structure schematic diagram is Figure 14 , and its wear ratio is 800, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0270] Example 24

[0271] A Weigh 2 g of fine-grained diamond single crystals with an average particle size of 300 μm and 40 g of the first matrix powder, and mix them evenly to obtain a second mixed powder;

[0272] B Powder spread 42 g of the second mixed powder in the mold, and the powder spreading thickness is 3 mm;

[0273] C Arrange 1 g of the second wear-resistant TSP (i.e., the triangular pyramid-shaped wear-resistant TSP prepared in Example 4) in an orderly manner on the second mixed powder after powder spreading according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent triangular pyramid-shaped wear-resistant TSPs;

[0274] Powder spread 42 g of the first mixed powder, and the powder spreading thickness is 3 mm; Arrange 1 g of coarse-grained diamond single crystals with an average particle size of 550 μm in an orderly manner on the first matrix powder after powder spreading according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent coarse-grained diamond single crystals, obtaining the second particle layer;

[0275] Repeat steps B and C three times, and finally spread 35 g of the second mixed powder on the second particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent triangular pyramid-shaped wear-resistant TSPs and the gaps between any two adjacent coarse-grained diamond single crystals are filled with the second mixed powder, and the orderly arranged triangular pyramid-shaped wear-resistant TSPs and coarse-grained diamond single crystals form a three-dimensional cross-covering layout;

[0276] E Assemble the mold, hot press and sinter at 880 °C and 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, the internal structure schematic diagram of which is Figure 15 , and its wear ratio is 680, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. as needed.

[0277] Example 25

[0278] A Weigh 2 g of the second natural diamond with an average particle size of 300 μm and 40 g of the first matrix powder, mix evenly to obtain the second mixed powder;

[0279] B Spread 42 g of the second mixed powder in the mold with a spreading thickness of 3 mm;

[0280] C Arrange 1 g of the second wear-resistant TSP (i.e., the cube-shaped wear-resistant TSP prepared in Example 5) on the second mixed powder after spreading in an orderly manner according to the pattern of "particle, gap, particle", and there is a uniform gap between any two adjacent cube-shaped wear-resistant TSPs;

[0281] Spread 42 g of the second mixed powder in the mold with a spreading thickness of 3 mm; Arrange 1 g of the first natural diamond with an average particle size of 550 μm on the second mixed powder after spreading in an orderly manner according to the pattern of "particle, gap, particle", and there is a uniform gap between any two adjacent first natural diamonds to obtain the second particle layer;

[0282] D Repeat steps B and C three times, and finally spread 35 g of the second mixed powder on the second particle layer with a spreading thickness of 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the gaps between any two adjacent cube-shaped wear-resistant TSPs and the gaps between any two adjacent first natural diamonds are filled with the second mixed powder, and the orderly arranged cube-shaped wear-resistant TSPs and first natural diamonds form a three-dimensional cross-covering layout;

[0283] E Assemble the mold, hot press and sinter at 880 °C and 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, the internal structure schematic diagram of which is Figure 16, its wear ratio is 700, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0284] Example 26

[0285] A Weigh 1 g of fine-grained diamond single crystals with an average particle size of 300 μm, 1 g of second natural diamonds with an average particle size of 300 μm, and 40 g of first matrix powder, mix them evenly to obtain a second mixed powder.

[0286] B Spread 42 g of the second mixed powder in a mold, and the spreading thickness is 3 mm.

[0287] C Arrange 1 g of the second wear-resistant TSP (i.e., the cylindrical wear-resistant TSP prepared in Example 6) on the second mixed powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent cylindrical wear-resistant TSPs.

[0288] Spread 42 g of the second mixed powder, and the spreading thickness is 3 mm; arrange 0.5 g of coarse-grained diamond single crystals with an average particle size of 550 μm on the second mixed powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent coarse-grained diamond single crystals.

[0289] Spread 42 g of the second mixed powder in a mold, and the spreading thickness is 3 mm; arrange 0.5 g of first natural diamonds with an average particle size of 550 μm on the second mixed powder after spreading in an orderly manner according to the pattern of "particle, void, particle", and there is a uniform void between any two adjacent first natural diamonds to obtain a second particle layer.

[0290] D Repeat steps B and C three times, and finally spread 35 g of the second mixed powder on the second particle layer, and the spreading thickness is 2.5 mm, and press to obtain a raw material layer with a thickness of 20 mm. Among them, due to gravity, the voids between any two adjacent cylindrical wear-resistant TSPs, the voids between any two adjacent coarse-grained diamond single crystals, and the voids between any two adjacent first natural diamonds are filled with the second mixed powder, and the orderly arranged cylindrical wear-resistant TSPs, coarse-grained diamond single crystals, and first natural diamonds form a three-dimensional cross-overlay arrangement.

[0291] E Assemble the mold, hot press and sinter at 880 °C and a pressure of 200 kN for 10 min, clean and trim to obtain a speed-up impregnated diamond block, and its internal structure schematic diagram is Figure 17 , its wear ratio is 751, and it can be cut into shapes or combinations of shapes including but not limited to cylinders, rhombuses, cubes, cuboids, etc. according to needs.

[0292] The abrasion ratios of the speed-up impregnated diamond compacts prepared in Examples 7 to 26 are 100 to 900, which proves that the speed-up impregnated diamond compacts provided by the present invention have excellent wear resistance and are beneficial to improving the mechanical drilling speed of diamond bits.

[0293] Impregnated diamond bit

[0294] Example 27

[0295] Figure 18 shows the structure of an impregnated diamond bit according to the present invention. As Figure 18 shown, the impregnated diamond bit includes a bit body 1 and a speed-up impregnated diamond compact 2. Among them, the bit body 1 includes a main body portion 5 with cutting blades 4 provided on the crown portion 3 and the crown surface layer 6; the speed-up impregnated diamond compacts 2 are arranged on the cutting blades 4, covering the generatrix of the cutting blades 4. That is to say, the speed-up impregnated diamond compacts 2 are arranged in sequence along the generatrix of the cutting blades 4. According to the present invention, the crown surface layer 6 includes a first wear-resistant TSP 6-1; the speed-up impregnated diamond compact includes a second wear-resistant TSP.

[0296] In the embodiment of the present invention, the main body portion 5 is obtained by sintering a second matrix powder and a steel core. The components of the second matrix powder can be the same as or different from the first matrix powder used in the preparation process of the speed-up impregnated diamond compact 2 used in this embodiment. The components of the second matrix powder can be adjusted according to actual needs, and the corresponding sintering temperature can also be determined according to the components of the second matrix powder and the type of steel core, which is not specifically limited here.

[0297] According to the present invention, the shape of the crown portion 3 can be determined according to actual needs.

[0298] In the embodiment of the present invention, preferably, to improve the stability of the crown portion 3, a B-shaped profile is adopted, and the inner cone angle is 140°.

[0299] According to the present invention, the crown surface layer 6 covers the outer layer of the crown portion 3 to enhance the overall strength and wear resistance of the crown portion 3.

[0300] In the embodiment of the present invention, the crown surface layer 6 further includes a third matrix powder 6-2. The components of the third matrix powder can be the same as or different from the first matrix powder used in the preparation process of the impregnated diamond used in this embodiment. The components of the third matrix powder can be adjusted according to actual needs, and the corresponding sintering temperature can also be determined according to the components of the third matrix powder and the type of steel core, which is not specifically limited here.

[0301] In the embodiment of the present invention, preferably, the structure of the crown surface layer is as Figure 19 shown, wherein, the first wear-resistant TSP 6-1 and the third matrix powder 6-2 are uniformly mixed and then arranged on the outer layer of the crown portion 3 to obtain the crown surface layer 6.

[0302] In an embodiment of the present invention, preferably, the thickness of the crown surface layer 6 is 6 to 30 mm.

[0303] In an embodiment of the present invention, the abrasion ratios of the first wear-resistant TSP 6-1 and the second wear-resistant TSP are independently not less than 400,000.

[0304] In an embodiment of the present invention, the equal-volume equivalent ball diameters of the first wear-resistant TSP 6-1 and the second wear-resistant TSP are independently 0.5 to 5 mm.

[0305] In an embodiment of the present invention, preferably, the first wear-resistant TSP 6-1 and the second wear-resistant TSP are independently selected from at least one of the wear-resistant TSPs prepared in Examples 1 to 6.

[0306] In an embodiment of the present invention, preferably, the speed-up impregnated diamond block 2 is selected from at least one of the speed-up impregnated diamond blocks prepared in Examples 7 to 26.

[0307] In an embodiment of the present invention, preferably, the size of the speed-up impregnated diamond block 2 is generally at the centimeter level (such as 1 cm and 1.3 cm), and its shape can be determined according to actual needs, including but not limited to shapes such as cylinders, rhombuses, cubes, cuboids, or combinations of shapes.

[0308] In an embodiment of the present invention, preferably, a PDC composite sheet (not shown in Figure 18 ) is provided at one end of the cutter blade 4 close to the bit core to prevent the "core-pulling" phenomenon from occurring during the operation of the impregnated diamond bit.

[0309] In an embodiment of the present invention, preferably, the size of the PDC composite sheet is not less than 8 mm (such as 8 to 19 mm), and its shape can be determined according to actual needs, including but not limited to shapes such as cylinders, rhombuses, cubes, cuboids, or combinations of shapes.

[0310] In an embodiment of the present invention, a plurality of cutter blades 4 are circumferentially spaced and arranged on the crown 3, and each cutter blade 4 extends from the axial end of the crown 3 to the side, but has not extended to the lower end of the bit body 1.

[0311] According to the present invention, the number of cutter blades 4 provided on the crown 3 can be determined according to actual needs.

[0312] In an embodiment of the present invention, preferably, the number of cutter blades 4 is not less than 4.

[0313] In an embodiment of the present invention, preferably, gauge protectors 9 are spaced and provided at the end of each cutter blade 4 extending to the side.

[0314] In an embodiment of the present invention, preferably, the gauge body 9 is obtained by sintering a fourth matrix powder. The components of the fourth matrix powder may be the same as or different from those of the first matrix powder used in the preparation of the speed-up impregnated diamond block 2 used in this embodiment. The components of the fourth matrix powder can be adjusted according to actual needs, and the corresponding sintering temperature can also be determined according to the components of the fourth matrix powder and the type of steel core, which is not specifically limited herein.

[0315] In an embodiment of the present invention, preferably, the gauge body 9 is surface-mounted with TSP 9-1, the third diamond 9-2, and the gauge impregnated diamond block 9-3. The equal-volume equivalent sphere diameter of TSP 9-1 is 1 to 20 mm, the particle size of the third diamond 9-2 is 0.5 to 3 mm, and the size of the gauge impregnated diamond block 9-3 is at the centimeter level (for example, 1 cm and 1.3 cm), and its shape can be determined according to actual needs, including but not limited to shapes such as cylinders, rhombuses, cubes, cuboids, or combinations of shapes.

[0316] In an embodiment of the present invention, preferably, TSP 9-1 is the wear-resistant TSP prepared in any one of Embodiments 1 to 6 of the present invention.

[0317] In an embodiment of the present invention, the third diamond is the second single crystal diamond.

[0318] In an embodiment of the present invention, a flow channel 10 is provided between any two adjacent cutter wings 4.

[0319] In an embodiment of the present invention, the impregnated diamond bit further includes a sub 7 and a core hole 8. The nozzle 11 disposed in the bit body 1 connects the flow channel 10 and the core hole 8, and the central axis of the nozzle 11 is inclined relative to the central axis of the bit body 1.

[0320] In an embodiment of the present invention, preferably, the arrangement of the nozzles 11 covers the bottom hole bus, that is: there is an overlapping part between the central axis of the nozzle 11 and the central axis of the bit body 1.

[0321] Example 28

[0322] Based on Example 27, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer 6 as Figure 20 shown, and the others are the same as those in Example 27.

[0323] Figure 20The structure of the coronal surface layer 6 is shown: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSPs 6-1 are orderly distributed in the crown surface layer 6. The orderly distribution of the first wear-resistant TSPs 6-1 means that the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than 0.5 mm, and the transverse spacing is not less than 0.5 mm. In the entire thickness direction of the crown surface layer 6, the first wear-resistant TSPs 6-1 are also orderly distributed. The transverse spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 can be adjusted within the above range according to actual needs. The transverse spacing and the longitudinal spacing can be equal or unequal, but the upper limit of the transverse spacing and the longitudinal spacing generally does not exceed the particle size of the first wear-resistant TSPs 6-1 themselves, so as to ensure the strength and wear resistance of the impregnated diamond bit.

[0324] Example 29

[0325] On the basis of Example 27, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer 6 as Figure 21 shown, and the others are the same as in Example 27.

[0326] Figure 21 The structure of the coronal surface layer 6 is shown: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSPs 6-1 are randomly distributed at the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 to the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSPs 6-1 is more biased towards the drilling front side, and there is no distribution of the first wear-resistant TSPs 6-1 on the side away from the drilling front in the thickness direction of the crown surface layer 6.

[0327] Example 30

[0328] On the basis of Example 27, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer 6 as Figure 22 shown, and the others are the same as in Example 27.

[0329] Figure 22The structure of the crown surface layer 6 is shown: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSP 6-1 is orderly distributed at the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 to the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSP 6-1 is more biased towards the drilling front side, and there is no distribution of the first wear-resistant TSP 6-1 on the side away from the drilling front in the thickness direction of the crown surface layer 6. The lateral spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than 0.5 mm, and the longitudinal spacing is not less than 0.5 mm. The lateral spacing and the longitudinal spacing can be equal or unequal. To avoid the distribution of the first wear-resistant TSPs 6-1 in the crown surface layer 6 being too sparse, which will affect the strength and wear resistance of the crown surface layer, the upper limit of the lateral spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than the particle size of the first wear-resistant TSP 6-1 itself.

[0330] Example 31

[0331] On the basis of Example 27, the crown surface layer of the impregnated diamond bit provided by the embodiment of the present invention further includes a second diamond 6-3, and the structure of the crown surface layer 6 is adjusted as follows: As Figure 23 shown, the third matrix powder 6-2, the first wear-resistant TSP 6-1 and the second diamond 6-3 are uniformly mixed and then arranged on the outer layer of the crown 3 to obtain the crown surface layer 6.

[0332] In the embodiment of the present invention, the second diamond 6-3 includes a first diamond single crystal and / or a third natural diamond.

[0333] In the embodiment of the present invention, preferably, the particle size of the second diamond 6-3 is 0.5 to 3 mm.

[0334] Example 32

[0335] On the basis of Example 31, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer to be as Figure 24 shown.

[0336] Figure 24The structure of the crown surface layer 6 is shown: The second diamond 6-3 and the third matrix powder 6-2 are evenly mixed and arranged on the outer layer of the crown 3 to obtain the crown surface layer 6. The first wear-resistant TSP 6-1 is orderly distributed in the crown surface layer 6. The orderly distribution of the first wear-resistant TSP 6-1 means that the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than 0.5 mm, and the transverse spacing is not less than 0.5 mm. In the entire thickness direction of the crown surface layer 6, the first wear-resistant TSP 6-1 is also orderly distributed. The transverse spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 can be adjusted within the above range according to actual needs. The transverse spacing and the longitudinal spacing can be equal or unequal, but the upper limit of the transverse spacing and the longitudinal spacing generally does not exceed the particle size of the first wear-resistant TSP 6-1 itself, so as to ensure the strength and wear resistance of the impregnated diamond bit.

[0337] Example 33

[0338] On the basis of Example 31, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer as shown in Figure 25 shown.

[0339] Figure 25 The structure of the crown surface layer 6 is shown: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6. The first wear-resistant TSP 6-1 and the second diamond 6-3 are orderly distributed in the crown surface layer. Specifically, the first wear-resistant TSP 6-1 and the second diamond 6-3 are respectively arranged to form a first wear-resistant TSP layer and a second diamond layer, and the first wear-resistant TSP layer and the second diamond layer are alternately stacked in the entire thickness direction of the crown surface layer 6. The transverse spacing between any two adjacent first wear-resistant TSPs 6-1, between any two adjacent second diamonds 6-3, and between any two adjacent first wear-resistant TSP 6-1 and second diamond 6-3 is not less than 0.5 mm, and the longitudinal spacing is not less than 0.5 mm. The transverse spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1, between any two adjacent second diamonds 6-3, and between any two adjacent first wear-resistant TSP 6-1 and second diamond 6-3 can be adjusted within the above range according to actual needs. The transverse spacing and the longitudinal spacing can be equal or unequal, but the upper limit of the transverse spacing and the longitudinal spacing generally does not exceed the particle sizes of the first wear-resistant TSP 6-1 and the second diamond 6-3.

[0340] Example 34

[0341] On the basis of Example 31, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer as shown in Figure 26 shown.

[0342] Figure 26 It shows the structure of the crown surface layer 6: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSP 6-1 and the second diamond 6-3 are randomly distributed at the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 to the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSP 6-1 and the second diamond 6-3 is more biased towards the drilling front side, and there is no distribution of the first wear-resistant TSP 6-1 and the second diamond 6-3 on the side away from the drilling front in the thickness direction of the crown surface layer 6.

[0343] Example 35

[0344] Based on Example 31, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer 6 as Figure 27 shown.

[0345] Figure 27 It shows the structure of the crown surface layer 6: After the third matrix powder 6-2 and the second diamond 6-3 are evenly mixed, they are arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSP 6-1 is orderly distributed at the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 to the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSP 6-1 is more biased towards the drilling front side, and there is no distribution of the first wear-resistant TSP 6-1 on the side away from the drilling front in the thickness direction of the crown surface layer 6. The lateral spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than 0.5 mm, and the longitudinal spacing is not less than 0.5 mm. The lateral spacing and the longitudinal spacing can be equal or unequal. To avoid that the too sparse distribution of the first wear-resistant TSPs 6-1 in the crown surface layer 6 will affect the strength and wear resistance of the crown surface layer, the upper limit of the lateral spacing and the longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than the particle size of the first wear-resistant TSP 6-1 itself.

[0346] Example 36

[0347] Based on Example 31, the impregnated diamond bit provided by the embodiment of the present invention adjusts the structure of the crown surface layer 6 as Figure 28 shown.

[0348] Figure 28 The structure of the crown surface layer 6 is shown: after uniformly mixing the third matrix powder 6-2 and the second diamond 6-3, they are arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSP 6-1 is randomly distributed at the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 on the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSP 6-1 is more biased towards the drilling front side, and there is no distribution of the first wear-resistant TSP 6-1 on the side away from the drilling front in the thickness direction of the crown surface layer 6.

[0349] Example 37

[0350] Based on Example 33, the structure of the crown surface layer 6 of the impregnated diamond bit provided in the embodiment of the present invention is adjusted as Figure 29 shown.

[0351] Figure 29Shows the structure of the crown surface layer 6: The third matrix powder 6-2 is arranged on the outer layer of the crown 3 to obtain the crown surface layer 6, and the first wear-resistant TSP 6-1 and the second diamond 6-3 are orderly distributed on the drilling front of the crown surface layer 6. According to the present invention, the drilling front refers to the area where the crown surface layer 6 first contacts the rock when the impregnated diamond bit drills the rock. However, in order to enhance the improvement degree of the strength and wear resistance of the crown surface layer 6 to the crown 3, the drilling front area of the crown surface layer 6 is expanded to the outer surface outside the crown surface layer 6, and more preferably the outer surface of the entire crown surface layer 6. In the thickness direction of the crown surface layer 6, the distribution of the first wear-resistant TSP 6-1 and the second diamond 6-3 is more biased towards the drilling front side, while there is no distribution of the first wear-resistant TSP 6-1 and the second diamond 6-3 on the side away from the drilling front in the thickness direction of the crown surface layer 6. Specifically, the first wear-resistant TSP 6-1 and the second diamond 6-3 are respectively arranged to form a first wear-resistant TSP layer and a second diamond layer, and the first wear-resistant TSP layer and the second diamond layer are alternately stacked on the side of the crown surface layer 6 biased towards the outer surface in the thickness direction of the crown surface layer 6. The lateral spacing between any two adjacent first wear-resistant TSPs 6-1, between any two adjacent second diamonds 6-3, and between any two adjacent first wear-resistant TSPs 6-1 and second diamonds 6-3 is not less than 0.5 mm, and the longitudinal spacing is not less than 0.5 mm. The lateral spacing and longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1, between any two adjacent second diamonds 6-3, and between any two adjacent first wear-resistant TSPs 6-1 and second diamonds 6-3 can be adjusted within the above range according to actual needs. The lateral spacing and longitudinal spacing can be equal or unequal. However, in order to avoid the distribution of the first wear-resistant TSP 6-1 in the crown surface layer 6 being too sparse, which will affect the strength and wear resistance of the crown surface layer, the upper limit of the lateral spacing and longitudinal spacing between any two adjacent first wear-resistant TSPs 6-1 is not less than the particle size of the first wear-resistant TSP 6-1 itself.

[0352] In an embodiment of the present invention, a first wear-resistant TSP layer and a second diamond layer are arranged on the drilling front of the crown surface layer 6.

[0353] In an embodiment of the present invention, preferably, in the thickness direction of the crown surface layer, a first wear-resistant TSP layer is first arranged on the side biased towards the outer surface of the crown surface layer 6, and then a second diamond layer is stacked.

[0354] The impregnated diamond bit provided by the present invention has the following advantages: At least one wear-resistant TSP prepared in Examples 1 to 6 of the present invention and a speed-up impregnated diamond block containing the wear-resistant TSP prepared in Examples 7 to 26 are added to the impregnated diamond bits provided by the present invention. The wear-resistant TSP has good wear resistance and acceptable high-temperature resistance while its wear ratio can reach more than 400,000 and its graphitization temperature can reach more than 800 °C. Combining the design of ratio regulation and raw material assembly method, the speed-up impregnated diamond block containing it has excellent wear resistance with the highest wear ratio reaching 900, and also has good wear resistance, laying a foundation for the increase of the rotation speed and the penetration rate of the impregnated diamond bit. In the speed-up impregnated diamond block 2 arranged on the cutter blade 4, since the particle size of the second wear-resistant TSP is much larger than that of the first diamond (i.e., at least one of coarse-grained diamond single crystal, fine-grained diamond single crystal, first natural diamond, and second natural diamond), the speed-up impregnated diamond block 2 has a relatively high exposure height. Combining its high wear resistance, the second wear-resistant TSP forms cutting rock breaking during the drilling process of the impregnated diamond bit, and first cuts out deeper grooves in the formation. On the one hand, it releases the formation stress, so that the strength of the protruding formation rock decreases significantly due to the reduction of the formation stress, enhancing the drillability of the formation; on the other hand, the coarser-grained second wear-resistant TSP generates cracks and micro-cracks in the formation during the cutting process, further enhancing the drillability of the formation. At this time, the first diamond with a particle size smaller than that of the second wear-resistant TSP in the speed-up impregnated diamond block 2 arranged on the cutter blade 4 breaks the rock in a way of plowing, scratching, and grinding on the rock with enhanced drillability after being cut by the second wear-resistant TSP. Due to the enhanced drillability of the rock, the rotation speed of the impregnated diamond bit will be greatly increased when the cutting rock breaking of the second wear-resistant TSP is combined with the plowing, scratching, and grinding of the first diamond; at the same time, these finer-grained first diamonds themselves are also protected due to the improvement of the drillability of the rock, which is beneficial to increasing the penetration rate of the impregnated diamond bit. Secondly, while the crown surface 6 of the bit body 1 is added with the first wear-resistant TSP 6-1, it is also preferably added with the second diamond 6-3. During the drilling process, when the crown surface 6 contacts the formation, similar to the speed-up impregnated diamond block 2 arranged on the cutter blade 4, the larger-grained first wear-resistant TSP first cuts the formation, releases the formation stress and generates cracks and micro-cracks in the formation, enhancing the drillability of the formation. The lower-grained second diamond breaks the rock with enhanced drillability in the formation in a way of plowing, scratching, and grinding, combining cutting with plowing, scratching, and grinding again, further increasing the drilling speed on the basis of the speed-up impregnated diamond block 2 on the cutter blade 4 and protecting the second diamond 6-3, increasing the penetration rate.Furthermore, the present invention preferably arranges the second wear-resistant TSP, coarse-grained diamond single crystals, and the first natural diamond in the impregnated diamond block 2 for speed increase in an orderly manner, and preferably distributes the first wear-resistant TSP 6-1 and the second diamond 6-3 in the crown surface layer 6 in an orderly manner, which is conducive to ensuring the steady increase of the drilling speed and footage of the impregnated diamond bit during the drilling process, and is also conducive to enhancing the stability of the entire drilling process of the formation. Considering the preparation cost of the impregnated diamond, the present invention preferably distributes the first wear-resistant TSP 6-1 and / or the second diamond 6-3 at the drilling front of the crown surface layer 6, which not only specifically enhances the drilling ability of the drilling front to the formation but also reduces the cost. Further, the present invention preferably provides a PDC composite sheet at one end of the cutter wing 4 close to the bit core to avoid the phenomenon of "coring" during the drilling process. Finally, the present invention also preferably sets the crown of the impregnated diamond bit to a stable B-type profile and provides a smaller inner cone angle, which is combined with a gauge body with TSP 9-1 (preferably the wear-resistant TSP prepared by the present invention), the third diamond 9-2, and the gauge impregnated diamond block 9-3 surface-mounted at intervals at the end of the cutter wing extending laterally to jointly enhance the stability of the entire impregnated diamond bit during the drilling process. Based on the above design, the present invention realizes the improvement of the mechanical rotation speed and footage of the impregnated diamond bit.

[0355] Performance Evaluation of Impregnated Diamond Bit

[0356] Taking a comparative test with a comparative impregnated diamond bit with the same diamond concentration, bit shape, and sintering process as the prior art, which only adds diamond single crystals and does not add wear-resistant TSP, and drilling the same piece of granite at the same drilling pressure and rotation speed, the percentage increase in the mechanical drilling speed and footage of the impregnated diamond bit prepared in this application is shown in Table 3. Taking the impregnated diamond bit containing both the first wear-resistant TSP and the second wear-resistant TSP from the same example among Examples 1 to 6 as an example for detailed description.

[0357] Table 3. Performance of Impregnated Diamond Bit

[0358]

[0359]

[0360] As can be seen from Table 3, compared with the impregnated diamond bit that only adds single crystal diamond and does not add wear-resistant TSP, the mechanical rotation speed and footage of the impregnated diamond bit provided by the present invention during granite drilling are both increased by more than 35%. Specifically, the mechanical drilling speed of the impregnated diamond bit prepared by the present invention is increased by 40% to 58%, and the footage is increased by 37% to 65%. This shows that the impregnated diamond bit provided by the present invention, which adds the wear-resistant TSP prepared by the present invention and the impregnated diamond block with speed increase containing the wear-resistant TSP prepared by the present invention, has improvements in mechanical drilling speed and footage, overcomes the problems of low drilling speed, small footage, easy wear, and high drilling cost of the existing impregnated diamond bit, and is suitable for popularization and use in the fields of oil and gas drilling and geological drilling.

[0361] Although the present invention has been described with reference to specific embodiments, those skilled in the art should understand that various changes can be made without departing from the true spirit and scope of the present invention. In addition, various changes can be made to the main body, spirit, and scope of the present invention to adapt to specific situations, materials, material compositions, and methods. All such changes are included within the scope of the claims of the present invention.

Claims

1. A impregnated diamond bit, comprising a bit body (1) and a speed-up impregnated diamond block (2), wherein: The bit body includes a main body portion (5) with cutting blades (4) provided on a crown portion (3) and a crown surface layer (6); The speed-up impregnated diamond blocks are arranged on the cutting blades, covering the generatrix of the cutting blades; The crown surface layer includes a first wear-resistant TSP (6-1); The speed-up impregnated diamond blocks include a second wear-resistant TSP.

2. The impregnated diamond bit according to claim 1, wherein, The first wear-resistant TSP or the second wear-resistant TSP is prepared by the following method: 1) Removing the cemented carbide layer from a polycrystalline diamond compact with a wear ratio of not less than 400,000, and retaining the polycrystalline diamond layer; 2) Cutting the polycrystalline diamond layer to obtain the first wear-resistant TSP or the second wear-resistant TSP.

3. The impregnated diamond bit according to claim 2, wherein, In step 2), after cutting the polycrystalline diamond layer, perform first decobaltization to obtain the first wear-resistant TSP or the second wear-resistant TSP; or In step 2), after cutting the polycrystalline diamond layer, deposit a first metal coating on the surface to obtain the first wear-resistant TSP or the second wear-resistant TSP; or In step 2), after cutting the polycrystalline diamond layer, perform second decobaltization, and then deposit a second metal coating on the surface to obtain the first wear-resistant TSP or the second wear-resistant TSP.

4. The impregnated diamond bit according to claim 3, wherein, In step 2), the depth of the first decobaltization and the depth of the second decobaltization are independently not less than 500 μm.

5. The impregnated diamond bit according to claim 3, wherein In step 2), the thicknesses of the first metal coating and the second metal coating are independently 1 to 3 μm; and / or The first metal coating and the second metal coating are independently a titanium coating or a nickel coating.

6. The impregnated diamond bit according to any one of claims 1 to 5, characterized in that, The speed-up impregnated diamond blocks further include first diamond and first matrix powder; Preferably, the first diamond is at least one of coarse-grained diamond single crystal, fine-grained diamond single crystal, first natural diamond, and second natural diamond.

7. The impregnated diamond bit according to claim 6, characterized in that In the speed-up impregnated diamond blocks, the second wear-resistant TSP, the first diamond, and the first matrix powder are uniformly mixed; or The second wear-resistant TSP is arranged in an orderly manner in the mixture of the first diamond and the first matrix powder; or At least one of the coarse-grained diamond single crystal and the first natural diamond and the second wear-resistant TSP are arranged in an orderly manner in the mixture of at least one of the fine-grained diamond single crystal and the second natural diamond and the first matrix powder; or At least one of the coarse-grained diamond single crystal and the first natural diamond and the second wear-resistant TSP are arranged in an orderly manner in the first matrix powder.

8. The impregnated diamond bit according to claim 7, wherein, Taking the mass of the speed-up impregnated diamond blocks as 100%, the speed-up impregnated diamond blocks include 1 to 10 wt% of the second wear-resistant TSP, 1 to 25 wt% of the first diamond, and 65 to 95 wt% of the first matrix powder; or Taking the mass of the speed-up impregnated diamond block as 100%, the speed-up impregnated diamond block comprises 0.7 to 20 wt% of the second wear-resistant TSP, 0 to 39 wt% of the coarse diamond single crystal, 0 to 39 wt% of the first natural diamond, 60 to 99 wt% of the first matrix powder, 0 to 20 wt% of the fine diamond single crystal and 0 to 20 wt% of the second natural diamond.

9. The impregnated diamond bit according to claim 7 or 8, characterized in that, The particle size of the coarse diamond single crystal is 0.5 to 1 mm; and / or The particle size of the fine diamond single crystal is 0.05 to 0.5 mm; and / or The particle sizes of the first natural diamond and the second natural diamond are independently 0.3 to 3 mm.

10. The impregnated diamond bit according to any one of claims 1 to 9, characterized in that, The main body part is obtained by sintering a second matrix powder and a steel core; and / or The crown surface layer further comprises a third matrix powder (6 - 2).

11. The impregnated diamond bit according to claim 10, characterized in that, The crown surface layer further comprises a second diamond (6 - 3).

12. The impregnated diamond bit according to claim 10, wherein, A mixture of the first wear-resistant TSP and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer; or The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed in the crown surface layer; or The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is randomly distributed at the drilling front of the crown surface layer; or The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed at the drilling front of the crown surface layer; Preferably, the longitudinal spacing between any two adjacent first wear-resistant TSPs is not less than 0.5 mm, and the lateral spacing is not less than 0.5 mm.

13. The impregnated diamond bit according to claim 11, wherein, A mixture of the first wear-resistant TSP, the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer; or A mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed in the crown surface layer; or The third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are orderly distributed in the crown surface layer; or A mixture of the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are randomly distributed at the drilling front of the crown surface layer; or A mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is orderly distributed at the drilling front of the crown surface layer; or A mixture of the second diamond and the third matrix powder is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP is randomly distributed at the drilling front of the crown surface layer; or The third matrix powder material is arranged on the outer layer of the crown of the main body part to obtain the crown surface layer, and the first wear-resistant TSP and the second diamond are orderly distributed at the drilling front of the crown surface layer; Preferably, the longitudinal distance and the transverse distance between any two adjacent first wear-resistant TSPs and / or second diamonds are not less than 0.5 mm.

14. The impregnated diamond bit according to any one of claims 1 to 13, characterized in that, The thickness of the crown surface layer is 6 to 30 mm.

15. The impregnated diamond bit according to any one of claims 1 to 14, characterized in that, The abrasion ratios of the first wear-resistant TSP and the second wear-resistant TSP are independently not less than 400,000; and / or The equal-volume equivalent ball diameters of the first wear-resistant TSP and the second wear-resistant TSP are independently 0.5 to 5 mm; and / or The particle size of the second diamond is 0.5 to 3 mm; Preferably, the second diamond includes a first diamond single crystal and / or a third natural diamond.

16. The impregnated diamond bit according to any one of claims 1 to 15, characterized in that, The impregnated diamond bit further includes a sub (7) and a core hole (8); and / or The bit body further includes a gauge body (9), a flow channel (10), and a nozzle (11); Preferably, the gauge body is sintered from a fourth matrix powder material; and / or The gauge body is surface-mounted with a TSP (9-1), a third diamond (9-2), and a gauge-impregnated diamond block (9-3).

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