A type of impregnated diamond bit adapted for drilling into superhard formations

Abstract

The invention discloses a kind of superhard formation drilling of geological exploration suitable for impregnated diamond bit, including steel body and matrix, the matrix of the drill bit is arranged on the steel body, the drill bit matrix is composed of two parts of working layer matrix and non-working layer matrix;The formula of working layer matrix and non-working matrix is different, and the sintering temperature of working layer matrix is higher than that of non-working layer matrix.The drill bit is suitable for superhard formation drilling, and has the advantages of fast drilling speed, high drilling efficiency and long service life.

Description

Technical Field

[0001] This invention relates to a drill bit for geological exploration, and more particularly to an impregnated diamond drill bit adapted for drilling in ultra-hard formations during geological exploration. Background Technology

[0002] As drilling technology is increasingly widely used in various fields and drilling depths are increasing, the number of times ultra-hard formations are encountered during drilling is also increasing.

[0003] Existing impregnated diamond drill bits often fail to advance properly when drilling into ultra-hard formations, as the diamond in the working layer of the matrix does not extend beyond the cutting edge. This results in the drill bit slipping on the rock and making progress very slow, leading to extremely low drilling efficiency. Therefore, developing impregnated diamond drill bits suitable for drilling in ultra-hard geological exploration formations has become a crucial technical problem urgently needing to be solved in the drilling industry. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of existing impregnated diamond drill bits and provide an impregnated diamond drill bit with high drilling efficiency that is suitable for drilling in ultra-hard formations in geological exploration.

[0005] The technical solution adopted by this invention to solve its technical problem is: an impregnated diamond drill bit adapted for drilling in ultra-hard formations in geological exploration, comprising a steel body and a matrix, wherein the steel body is provided with an inner water groove, a water inlet and an outer water groove, the matrix is ​​disposed on the steel body, and the matrix includes a working layer matrix and a non-working layer matrix, wherein the non-working layer matrix connects the working layer matrix and the steel body; characterized in that: the formulation of the working layer matrix material is different from that of the non-working layer matrix material, and the theoretical sintering temperature of the working layer matrix material is higher than that of the non-working layer matrix material; The method for preparing the impregnated diamond drill bit suitable for drilling in ultra-hard formations in geological exploration includes the following steps: S1: Add the working layer matrix formula powder, working diamond, coarse low-quality artificial diamond, and crushed polycrystalline material, stir evenly to obtain mixture one, and then put mixture one into the mold. S2: Add the non-working layer carcass formula powder, stir evenly to obtain mixture two, then put mixture two into the mold, place mixture two on mixture one, and press it into the desired shape; S3: After pressing, assemble and sinter to obtain a semi-finished product. Then, machine the threads, mill the inner and outer water grooves, and perform surface treatment to complete the product. When sintering, when the sintering temperature reaches the theoretical sintering temperature of the non-working layer matrix powder, enter the heat preservation stage and keep it warm for 6-15 minutes (preferably 8-11 minutes).

[0006] Furthermore, the mass ratio of each component in the non-working layer carcass formulation powder is: Fe(CN) : Ni : Co : Zn : BCuSn = 26-28 : 5-8 : 3 : 5-6 : 56-60.

[0007] Furthermore, the working layer matrix formulation includes diamond and formulation powder, wherein the mass ratio of each component of diamond is: coarse-grained low-quality synthetic diamond : fragmented polycrystalline diamond : working diamond = 10-18 : 10-12 : 70-80, and the mass ratio of each component of formulation powder is: BCuSn : WC : Ni : Co : Zn = 45-50 : 35-38 : 4-6 : 7 : 4.

[0008] Furthermore, the coarse-grained low-quality synthetic diamond and the fragmented polycrystalline particles have a particle size of 16 / 25 mesh, and their volume is 5-10 times larger than that of the working diamond, and their mass ratio is 10-30% of that of the working diamond.

[0009] Furthermore, the working diamond is ISD1750 with a particle size of 30-40 mesh.

[0010] Furthermore, the theoretical sintering temperature of the working layer matrix formulation is 30-120℃ higher than that of the non-working layer matrix formulation. Studies have shown that the smaller the difference in sintering temperatures, the higher the alloying degree of the working layer matrix, and vice versa.

[0011] The principle and beneficial effects of this invention: Research shows that during the manufacturing process of existing impregnated diamond drill bits, the sintering temperature reaches the theoretical sintering temperature of the working layer matrix before entering the heat preservation stage. After sintering, both the working layer matrix and the non-working layer matrix are basically in an alloyed state, and the overall strength of the matrix is ​​high. This is the basic reason why, when drilling into ultra-hard formations, the diamond in the working layer of the matrix does not come to the cutting edge, and the drill bit slips on the rock and does not advance, or advances very slowly. In the manufacturing process of this invention, the formulation of the working layer matrix material differs from that of the non-working layer matrix material, and the theoretical sintering temperature of the working layer matrix material is higher than that of the non-working layer matrix material. During sintering, when the sintering temperature reaches the theoretical sintering temperature of the non-working layer matrix powder, the process enters the heat preservation stage. After sintering, the working layer matrix is ​​in a low-alloy state, resulting in lower overall strength and poor wear resistance. Therefore, during drilling, the diamond exposure height increases, enhancing the diamond's ability to penetrate rock and improving drilling speed. Simultaneously, diamond utilization is improved, and the drill bit life is extended.

[0012] Furthermore, by adding coarse-grained low-quality synthetic diamonds and fine-grained polycrystalline particles to the working layer matrix, the coarse-grained low-quality synthetic diamonds and fine-grained polycrystalline particles have poor retention with metal materials and are brittle. They are easily damaged and fall off during drilling, causing the working layer matrix to form a honeycomb structure during drilling. At the same time, the fallen low-quality diamonds and polycrystalline particles aggravate the wear of the working layer matrix, which is conducive to the advanced diamond wear of the working layer matrix, so that the drill bit can always maintain a high drilling speed and is suitable for drilling in ultra-hard formations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an embodiment of the impregnated diamond drill bit of the present invention, adapted for drilling in ultra-hard formations in geological exploration.

[0014] In the diagram: 1. Working layer tire body; 2. Non-working layer tire body; 3. Steel body; 4. Inner water tank; 5. Water inlet; 6. Outer water tank. Detailed Implementation

[0015] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and examples. The described embodiments should not be construed as limiting the scope of protection claimed in this patent application. Example 1

[0016] Reference Figure 1 This embodiment includes a working layer matrix 1, a non-working layer matrix 2, and a steel body 3. The non-working layer matrix 2 is located on the steel body 3 and connects the working layer matrix 1 and the steel body 3. The steel body 3 is provided with an inner water tank 4, a water inlet 5, and an outer water tank 6. The working layer matrix 1 formula includes diamond and formula powder, wherein the mass ratio of each component of diamond is: coarse-grained low-quality synthetic diamond: crushed polycrystalline diamond: working diamond (ISD1750, particle size 30-40 mesh) = 10:10:80; the mass ratio of each component of the formula powder of the working layer matrix 1 is: BCuSn: WC: Ni: Co: Zn = 50:35:4:7:4; the theoretical sintering temperature of the working layer matrix 1 formula is 950℃, and the theoretical sintering temperature of the non-working layer matrix 2 formula powder is 900℃. The preparation method includes the following steps: S1: Add 135.6g of working layer matrix 1 formula powder, 11.4g of working diamond (ISD1750, particle size 30-40 mesh), 1.4g of coarse low-quality synthetic diamond, and 1.4g of crushed polycrystalline material; the mass ratio of each component of the working layer matrix 1 formula powder is: BCuSn : WC : Ni : Co : Zn = 50 : 35 : 4 : 7 : 4, stir evenly to obtain mixture one, and then put mixture one into the mold; S2: Add 128.3g of the non-working layer matrix 2 formula powder. The mass ratio of each component of the non-working layer matrix 2 formula powder is: Fe(CN):Ni:Co:Zn:BCuSn=28:8:3:5:56. Stir evenly to obtain mixture two. Put mixture two into the mold, place mixture two on mixture one, and press it into the desired shape. S3: After pressing, the parts are assembled and sintered to obtain a semi-finished product. Subsequent machining of threads, milling of inner and outer water grooves, and surface treatment complete the final product. During sintering, when the sintering temperature reaches the theoretical sintering temperature of the non-working layer matrix 2 (900℃), the holding stage begins, lasting for 9 minutes. Under this sintering condition, the non-working layer is fully alloyed. The working layer matrix 1, due to its actual sintering temperature of 900℃ being lower than the theoretical sintering temperature of its formula (950℃), is in a low-alloy state upon completion of the sintering step. The matrix has poor wear resistance. During drilling, the diamond exposure height increases, increasing the strength of the diamond in breaking down rocks, improving drilling speed, increasing diamond utilization, and extending drill bit life.

[0017] In this embodiment, the drilling speed reached 2.2 meters per hour for extremely hard and intact rocks with fine particles containing more than 80% quartz, and the service life was 43 meters; no slippage occurred. Example 2

[0018] Reference Figure 1 This embodiment of an impregnated diamond drill bit adapted for geological exploration of ultra-hard formations includes a working matrix 1, a non-working matrix 2, and a steel body 3. The non-working matrix 2 is located on the steel body 3 and connects the working matrix 1 and the steel body 3. The steel body 3 is provided with an inner water groove 4, a water inlet 5, and an outer water groove 6. The working matrix 1 formula includes diamond and formula powder. The diamond is composed of: coarse-grained low-quality synthetic diamond: crushed polycrystalline diamond: working diamond (ISD1750, particle size 30-40 mesh) = 18:12:70 by mass ratio. The mass ratio of each component of the formula powder in the non-working matrix 2 is: Fe(CN):Ni:Co:Zn:BCuSn = 26:5:3:6:60. The theoretical sintering temperature of the working matrix 1 formula is 960℃, and the theoretical sintering temperature of the non-working matrix 2 formula powder is 890℃. The preparation method includes the following steps: S1: Add 142.3g of working layer matrix 1 formula powder, 11.4g of working diamond (ISD1750, particle size 30-40 mesh), 2.6g of coarse low-quality synthetic diamond, and 1.7g of crushed polycrystalline material; wherein, the working layer matrix 1 formula powder is: BCuSn : WC : Ni : Co : Zn :=45 : 38 : 6 : 7 : 4 by mass ratio, stir evenly to obtain mixture one, and then put mixture one into the mold; S2: Add 127g of the non-working layer body 2 formula powder. The non-working layer body 2 formula powder is: Fe(CN):Ni:Co:Zn:BCuSn=26:5:3:6:60 by mass ratio. Stir evenly to obtain mixture two. Put mixture two into the mold, place mixture two on top of mixture one, and press it into the desired shape. S3: After pressing, the parts are assembled and sintered to obtain a semi-finished product. Subsequent machining of threads, milling of internal and external water grooves, and surface treatment complete the final product. In the sintering step, the sintering temperature is raised to 890℃, held for 11 minutes, and then cooled to room temperature. During sintering, when the sintering temperature reaches the theoretical sintering temperature of the non-working layer matrix 2 (890℃), the holding stage begins. Under this sintering condition, the non-working layer matrix 2 is fully alloyed. The working layer matrix 1, due to its actual sintering temperature being lower than the theoretical sintering temperature of its formula (960℃), is in a low-alloy state after sintering. This results in lower overall strength and poor wear resistance. During drilling, the diamond exposure height increases, increasing the diamond's ability to penetrate rock, improving drilling speed, increasing diamond utilization, and extending drill bit life.

[0019] Adding coarse-grained low-quality synthetic diamonds and fine-grained polycrystalline particles to the working layer matrix composition is problematic because these particles have poor retention with metal materials and are brittle. They are prone to breakage and detachment during drilling, causing the working layer matrix to develop a honeycomb structure. At the same time, the detached low-quality diamonds and polycrystalline particles exacerbate the wear of the working layer matrix, which is beneficial for the advanced diamond wear of the working layer matrix, allowing the drill bit to maintain a high drilling speed at all times.

[0020] In this embodiment, the drilling speed reached 2.3 meters per hour for extremely hard and intact rocks with fine particles containing more than 80% quartz, and the service life was 45 meters; no slippage occurred.

Claims

1. A diamond-impregnated drill bit adapted for drilling in ultra-hard formations in geological exploration, comprising a steel body and a matrix, wherein the steel body is provided with an inner water groove, a water inlet, and an outer water groove, and the matrix is ​​disposed on the steel body, the matrix comprising a working layer matrix and a non-working layer matrix, the non-working layer matrix connecting the working layer matrix and the steel body portion; characterized in that: The formulation of the working layer matrix material is different from that of the non-working layer matrix material, and the theoretical sintering temperature of the working layer matrix material is higher than that of the non-working layer matrix material. The method for preparing impregnated diamond drill bits suitable for ultra-hard geological formations includes the following steps: S1: Add the working layer matrix formula powder, working diamond, coarse low-quality artificial diamond, and crushed polycrystalline material, stir evenly to obtain mixture one, and then put mixture one into the mold. S2: Add the non-working layer carcass formula powder, stir evenly to obtain mixture two, then put mixture two into the mold, place mixture two on mixture one, and press it into the desired shape; S3: After pressing, assemble and sinter to obtain a semi-finished product. Then, machine the threads, mill the inner and outer water grooves, and perform surface treatment to complete the product. When sintering, when the sintering temperature reaches the theoretical sintering temperature of the non-working layer matrix powder, enter the heat preservation stage and keep it warm for 6-15 minutes.

2. The impregnated diamond drill bit according to claim 1, suitable for drilling in ultra-hard geological formations, characterized in that: The mass ratio of each component in the non-working layer carcass formulation powder is: Fe(CN) : Ni : Co : Zn : BCuSn = 26-28 : 5-8 : 3 : 5-6 : 56-60.

3. A diamond-impregnated drill bit adapted for drilling in ultra-hard geological formations according to claim 1 or 2, characterized in that: The working layer matrix formulation includes diamond and formulation powder. The mass ratio of each component of the diamond is: coarse-grained low-quality synthetic diamond: fragmented polycrystalline diamond: working diamond = 10-18: 10-12: 70-80. The mass ratio of each component of the formulation powder is: BCuSn: WC: Ni: Co: Zn = 45-50: 35-38: 4-6: 7:

4.

4. A diamond-impregnated drill bit adapted for drilling in ultra-hard geological formations according to claim 1 or 2, characterized in that: The coarse-grained low-quality synthetic diamond and the fragmented polycrystalline particles have a particle size of 16 / 25 mesh, and their volume is 5-10 times larger than that of the working diamond, and their mass ratio is 10-30% of that of the working diamond.

5. A diamond-impregnated drill bit adapted for drilling in ultra-hard geological formations according to claim 1 or 2, characterized in that: The working diamond is ISD1750 with a particle size of 30-40 mesh.

6. A diamond-impregnated drill bit adapted for drilling in ultra-hard geological formations according to claim 1 or 2, characterized in that: The theoretical sintering temperature of the working layer matrix compound is 30-120℃ higher than that of the non-working layer matrix compound powder.

7. The impregnated diamond drill bit according to claim 3, suitable for drilling in ultra-hard geological formations, characterized in that: The theoretical sintering temperature of the working layer matrix compound is 30-120℃ higher than that of the non-working layer matrix compound powder.

8. The impregnated diamond drill bit according to claim 4, suitable for drilling in ultra-hard geological formations, characterized in that: The theoretical sintering temperature of the working layer matrix compound is 30-120℃ higher than that of the non-working layer matrix compound powder.

9. A diamond-impregnated drill bit adapted for drilling in ultra-hard geological formations according to claim 5, characterized in that: The theoretical sintering temperature of the working layer matrix compound is 30-120℃ higher than that of the non-working layer matrix compound powder.

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