Double-layer water nozzle diamond core drill bit and manufacturing method thereof

Abstract

The present invention discloses a double-layer sprue diamond coring drill bit and a manufacturing method thereof, and specifically relates to the drill bit technical field. A double-layer sprue diamond coring drill bit comprises a drill bit steel body, and a plurality of block embedding grooves are provided on one side of the drill bit steel body; a first diamond block and a second diamond block are arranged in intervals in all the block embedding grooves, a first layer of sprues are provided in the block embedding grooves, a second layer of sprues are provided in the block embedding grooves, the second layer of sprues penetrate the top of the drill bit steel body, the first layer of sprues and the second layer of sprues are both connected to the drill bit steel body, and water grooves distributed along one side of the first layer of sprues are provided on the inner and outer side walls of the drill bit steel body, and a plurality of gauge strips located between the first diamond block and the second diamond block are circumferentially embedded on the outer side wall of the drill bit steel body. The technical solution of the present invention solves the problem that the prior art has many processing steps and is not conducive to actual production when dealing with drilling fluid diversion, and can be used to improve the efficiency of geological drilling work.

Description

Technical Field

[0001] The invention relates to the technical field of drill bits, and in particular to a double-layer nozzle diamond coring drill bit and a manufacturing method thereof. Background Art

[0002] Rope coring technology has been widely used in geological drilling work, and the demand for high-performance diamond drill bits in hard, medium and weak abrasive formations is becoming more and more urgent. Ordinary diamond drill bits have short penetration and are easy to wear, which leads to frequent replacement of drill bits. In order to extend the service life of the drill bit, in addition to reasonably improving the matrix formula, the drill bit structure can also be improved, such as using a high matrix structure. However, most of the high-matrix drill bits nowadays have long water inlets or multi-layer water inlets, which lead to drilling fluid diversion and insufficient drilling fluid in the bottom layer. In order to solve the problem of drilling fluid diversion, construction workers use graphite and other materials to plug the mouth or water retaining plates and other structures to plug the mouth in the water inlet, but the above methods have many processing steps and are not conducive to actual production. Summary of the invention

[0003] The present invention aims to provide a double-layer water inlet diamond coring drill bit, which solves the problem that the prior art has many processing steps and is not conducive to actual production when processing drilling fluid diversion.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a double-layer sprue diamond coring drill bit, comprising a drill bit steel body, the drill bit steel body adopts an internally hollow cylindrical structure, and a plurality of block embedding grooves are provided on one side of the drill bit steel body; a first diamond block and a second diamond block which is not in the same block embedding groove as the first diamond block are arranged in intervals in all the block embedding grooves, and a plurality of the first diamond blocks are located on the upper side of the block embedding groove; a plurality of the second diamond blocks are located on the lower side of the block embedding groove, a first layer of sprues located below the first diamond blocks are provided in the block embedding groove, a second layer of sprues located above the second diamond blocks are provided in the block embedding groove, the second layer of sprues runs through the top of the drill bit steel body, the first layer of sprues and the second layer of sprues are both connected to the drill bit steel body, water grooves distributed along one side of the first layer of sprues are provided on the inner and outer side walls of the drill bit steel body, and a plurality of gauge strips located between the first diamond blocks and the second diamond blocks are circumferentially embedded on the outer side wall of the drill bit steel body.

[0005] Furthermore, a water inlet groove connected to a water tank is provided at the bottom of the tire block embedding groove.

[0006] Through the above arrangement, the water outlet groove can take over the slurry discharge work after the water groove is no longer worn out.

[0007] Furthermore, the width of the upper part of the water tank is greater than the width of the lower part of the water tank.

[0008] Through the above arrangement, the first layer of water inlet is connected with the inner and outer water channels of the drill bit steel body, and the slurry is not blocked by the first diamond embryo block or the second diamond embryo block during slurry discharge.

[0009] Further, the height difference between two adjacent first diamond blocks is α, and the height difference between two adjacent second diamond blocks is β, wherein α<β, and α is greater than the height of the non-working layer of the blocks.

[0010] Through the above arrangement, the structural design can be utilized to ensure that the first diamond block or the second diamond block can meet the requirement of grinding the formation on any working surface.

[0011] Further, the bottom surface of the first diamond green block is higher than the top surface of the second diamond green block adjacent to it in one direction.

[0012] Through the above arrangement, a double-layer structure of diamond blocks and nozzles is formed. Through alternating arrangement, the bending strength of the diamond blocks is ensured through the continuity of the drill bit steel body, and the smooth replacement of the first diamond block, the second diamond block and the nozzle is achieved. In addition, the upper and lower distribution of the first diamond block and the second diamond block is conducive to the renewal of the block lip shape, avoiding the disadvantage that the lip shape of the high-carcass drill bit no longer changes after the top carcass is worn.

[0013] Furthermore, a water retaining strip is embedded on the outer side wall of the drill bit steel body.

[0014] Through the above arrangement, the drilling fluid diversion can be prevented and the working efficiency of the scheme can be improved.

[0015] Furthermore, the method for manufacturing the diamond coring drill bit comprises the following steps:

[0016] S1. Lathe processing of drill steel body

[0017] The inner and outer walls of the steel body are processed by a lathe to form a cylindrical steel body with a through hole inside; a ring-shaped structure boss located below the tire block embedding groove is processed by a drill bit on the inner wall of the steel body, and the radius of the boss is smaller than the inner diameter of the steel body after forming;

[0018] S2. Milling of drill steel body

[0019] Use a milling machine to process the tire block embedding groove, the nozzle groove, the water groove on the outer wall of the steel body, the diameter protection strip embedding groove, and the water retaining strip embedding groove;

[0020] S3. Processing of the water groove on the inner wall of the drill bit steel body

[0021] A water tank on the inner wall of a steel body that is wire-cut on a wire-cut machining bed;

[0022] S4. Processing of graphite mold

[0023] Processing to form a cylindrical graphite mold, whose diameter is equal to the inner diameter of the steel body, and whose length is equal to the length of the tire block embedded in the groove, and the length from the top surface of the annular boss formed in the turning process to the top surface of the drill steel body;

[0024] S5. Processing of water retaining strips

[0025] In the initial stage of wire cutting processing of water retaining strips on the wire cutting machine, the curved part is polished with a grinding wheel;

[0026] S6, welding of diamond tire blocks, gauge strips and water retaining strips

[0027] The processed graphite mold is placed on the upper side of the drill bit steel body, on the annular boss formed during lathe processing, and after it is stabilized, the first diamond embryo block and the second diamond embryo block are assembled (the first diamond embryo block and the second diamond embryo block are both purchased finished products), and the first diamond embryo block and the second diamond embryo block are respectively assembled in each embryo block embedding groove, the gauge strip is assembled in the gauge strip embedding groove, and the water retaining strip is assembled in the water retaining strip embedding groove;

[0028] The first diamond block, the second diamond block, the gauge strip and the water retaining strip are subjected to high frequency welding;

[0029] After the drill bit steel body cools down, take out the graphite mold inside the drill bit steel body;

[0030] S7. Reprocessing of drill steel body

[0031] Using a lathe, the annular boss on the inner wall of the rigid body reserved in the initial processing is processed until its inner diameter is the same as the inner diameter of the drill steel body;

[0032] The inner wall thread is processed to the design requirements;

[0033] S8, Deep processing of drill steel body

[0034] Remove the oxide layer on the surface of the drill steel body and perform fine machining on a grinder.

[0035] Compared with the prior art, this solution has the following beneficial effects:

[0036] This solution is suitable for hard rock drilling, which increases the service life of the drill bit, increases the width of the inner and outer nozzles of the drill bit steel body, and avoids the phenomenon of mud diversion caused by long nozzles or multi-layer nozzles of high-carcass drill bits. At the same time, the structure is easy to process. In rope coring drilling work, the number of trips can be reduced and it is more conducive to mud circulation, which can not only greatly improve the working efficiency of the drill bit, but also save drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is an axial side view of a double-layer water nozzle diamond coring drill bit of the present invention;

[0038] Figure 2 It is a front view of a double-layer water nozzle diamond coring drill bit of the present invention;

[0039] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0040] Figure 4 It is a cross-sectional view of a double-layer water nozzle diamond coring drill bit of the present invention;

[0041] Figure 5 1 is a schematic structural diagram of a diamond tire block in which the tire block working surface is in a sharp tooth shape in this embodiment;

[0042] Figure 6 is a schematic structural diagram of a diamond tire block in which the tire block working surface is gear-shaped in this embodiment;

[0043] Figure 7 It is a schematic structural diagram of a diamond tire block in this embodiment whose working surface is trapezoidal teeth. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below through specific embodiments:

[0045] The reference numerals in the drawings of the specification include: drill bit steel body 1, block embedding groove 2, first diamond block 3, second diamond block 4, water retaining strip 5, first layer water inlet 6, second layer water inlet 7, water groove 8, and gauge strip 9.

[0046] Example

[0047] As attached Figures 1 to 4 As shown: A double-layer sprue diamond core drill bit includes a drill bit steel body 1, and the drill bit steel body 1 adopts an internal hollow cylindrical structure. A plurality of block embedding grooves 2 are opened circumferentially on the upper side of the drill bit steel body 1, and a first diamond block 3 and a second diamond block 4 which is not in the same block embedding groove 2 as the first diamond block 3 are arranged in intervals in all the block embedding grooves 2. A plurality of first diamond blocks 3 are located on the upper side of the block embedding groove 2, and the center line of the top surface of each first diamond block 3 coincides with the radius of the drill bit steel body 1, and the top surfaces of all first diamond blocks 3 are located in the same plane. A water retaining strip 5 located on one side of the first diamond block 3 is embedded on the outer side wall of the drill bit steel body 1. A plurality of second diamond blocks 4 are located on the lower side of the block embedding groove 2, and the center line of the top surface of each second diamond block 4 coincides with the radius of the drill bit steel body 1.

[0048] The first diamond block 3 and the second diamond block 4 each include a block non-working surface and a plurality of block working surfaces arranged on the block non-working surface. The plurality of block working surfaces are spaced apart and distributed on the three side surfaces of the block non-working surface, thereby forming an inner and outer diameter protection structure with the help of the block working surface, ensuring that the diamond coring drill bit avoids the problem of dimensional changes of the inner and outer walls of the drill bit steel body 1 due to wear during drilling. The bottom surface of the first diamond block 3 is higher than the top surface of the second diamond block 4 adjacent in one direction. The height difference between two adjacent first diamond blocks 3 is α, and the height difference between two adjacent second diamond blocks 4 is β, wherein α<β, and α is greater than the height of the non-working layer of the block. The shape of the block working surface on the first diamond block 3 and the second diamond block 4 can be adjusted according to the lithology of the drilled stratum. For example, the block working surface adopts a flat bottom shape: it can adapt to strata of various hardnesses, has high flexibility, and has a stable working state, and is not prone to unexpected drill bit damage. As shown in the attached Figure 5 As shown in the figure, the working surface of the tire block adopts sharp teeth or staggered sharp teeth (where staggered sharp teeth refers to a combination of sharp teeth with different numbers of teeth): this type of tooth structure can adapt to various hard to hard rock formations, and also performs well in soft and hard interlayered rock formations. Figure 6 As shown in the figure, the working surface of the tire block adopts a gear shape: its shape characteristics determine that this type of tooth structure can easily overcome various hard and slippery formations, and it also has a very good penetration effect on ordinary hard formations and excellent rock crushing effect. Figure 7 As shown, the working surface of the tire block adopts trapezoidal teeth: this tooth structure has the advantage of being adaptable to various formations and having excellent stability during penetration.

[0049] The block embedding groove 2 has a first layer of water inlets 6 located below the first diamond block 3, and the block embedding groove 2 also has a second layer of water inlets 7 located above the second diamond block 4. The second layer of water inlets 7 penetrates the top of the drill bit steel body 1, and the first layer of water inlets 6 and the second layer of water inlets 7 are both connected to the drill bit steel body 1. The inner and outer side walls of the drill bit steel body 1 are both provided with water grooves 8 distributed along one side of the first layer of water inlets 6, and the width of the upper part of the water grooves 8 is greater than the width of the lower part of the water grooves 8. The bottom of the block embedding groove 2 also has a water inlet groove connected to the water grooves 8 on the inner and outer side walls of the drill bit steel body 1. The outer side wall of the drill bit steel body 1 is circumferentially embedded with a plurality of gauge strip 9 embedding grooves located between the first diamond block 3 and the second diamond block 4, and the gauge strip 9 is engaged in the gauge strip 9 embedding groove.

[0050] This solution increases the carcass height of the diamond drill bit by alternately arranging the double-layer structure of the first diamond block 3 and the second diamond block 4, effectively increasing the life of the drill bit. In addition, the first diamond block 3 and the second diamond block 4 form a fixed height difference, so that during the drilling work, there is a working layer of the diamond block on any diamond block plane to perform the drilling work. The higher carcass structure can effectively reduce the number of times the drill bit is lifted and lowered to replace the drill bit in geological coring drilling work, improve drilling efficiency, and save drilling costs.

[0051] The structural design of the water retaining strip 5 makes it impossible for the second-layer water inlet 7 of the drill bit to be connected to the external water channel of the drill bit steel body 1 when it is not exposed, thus avoiding the situation where the drilling fluid is diverted when the first-layer water inlet 6 is working. Only the upper half of the water retaining strip 5 is welded to the drill bit steel body 1, and it can be detached in time when the second-layer water inlet 7 needs to be exposed, ensuring that the drill bit steel body 1 is connected to the external water channel. In addition, the height difference design between the upper and lower water inlets ensures that the drilling fluid will not pass through the working surface when the upper and lower water inlets take over, thus avoiding accidents such as drilling burns in the well.

[0052] The manufacturing method of the drill bit comprises the following steps:

[0053] S1. Lathe processing of drill steel body 1

[0054] The inner and outer walls of the steel body are processed by a lathe to form a cylindrical steel body with a through hole inside. During this part of the processing, an annular structure boss located below the tire block embedding groove 2 is processed on the inner wall of the steel body, and its radius is smaller than the inner diameter of the steel body after forming.

[0055] S2. Milling of drill steel body 1

[0056] Utilize milling machine to process tire block embedding groove 2, water inlet groove, water groove 8 of steel body outer side wall, diameter bar 9 embedding groove, water retaining bar 5 embedding groove. This part can adopt numerical control machine tool, and completes processing by inputting steel body model into numerical control machine tool.

[0057] S3. Processing of the inner wall water groove 8 of the drill bit steel body 1

[0058] The water tank 8 of the inner wall of the steel body is processed by wire cutting on the wire cutting machine.

[0059] S4. Processing of graphite mold

[0060] A cylindrical graphite mold is formed by machining, whose diameter is equal to the inner diameter of the steel body, and whose length is equal to the length of the tire block embedded in the groove 2, and the length from the top surface of the annular boss formed in the turning process to the top surface of the drill bit steel body 1.

[0061] S5. Processing of water retaining strip 5

[0062] In the initial stage of wire cutting processing of the water retaining strip 5 on the wire cutting processing bed, a grinding wheel is selected to grind the arc-shaped part.

[0063] This part can also be processed by CNC machine tools by inputting the model into the CNC machine tools.

[0064] S6, welding of diamond tire block, gauge strip 9 and water retaining strip 5

[0065] The processed graphite mold is placed on the upper side of the drill bit steel body 1, and on the annular boss formed during turning, after it is stabilized, the first diamond block 3 and the second diamond block 4 (the first diamond block 3 and the second diamond block 4 are both purchased finished products for installation) are assembled, and the first diamond block 3 and the second diamond block 4 are respectively assembled in each block embedding groove 2, the diameter guard strip 9 is assembled in the diameter guard strip 9 embedding groove, and the water retaining strip 5 is assembled in the water retaining strip 5 embedding groove.

[0066] The diamond tire block, the gauge strip 9 and the water retaining strip 5 are high frequency welded.

[0067] After the drill bit steel body 1 is cooled, the graphite mold in the drill bit steel body 1 is taken out.

[0068] S8. Reprocessing of drill steel body 1

[0069] The annular boss on the inner wall of the rigid body reserved in the initial processing is processed by lathe until its inner diameter is the same as the inner diameter of the drill steel body 1.

[0070] The inner wall thread is processed to design requirements.

[0071] S9, Deep processing of drill steel body 1

[0072] The oxide layer on the surface of the drill steel body 1 is removed and fine processing is performed on a grinding machine.

[0073] The above are only embodiments of the present invention, and the common knowledge such as the known specific structures and / or characteristics in the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A double-layer nozzle diamond core drill bit, characterized by: The drill bit comprises a steel body, which adopts a cylindrical structure with a hollow interior, and a plurality of block embedding grooves are arranged on one side of the drill bit steel body; a first diamond block and a second diamond block which is not in the same block embedding groove as the first diamond block are arranged in intervals in all the block embedding grooves, and a plurality of the first diamond blocks are located on the upper side of the block embedding groove; a plurality of the second diamond blocks are located on the lower side of the block embedding groove; a first layer of water inlets located below the first diamond block is arranged in the block embedding groove, a second layer of water inlets located above the second diamond block is arranged in the block embedding groove, the second layer of water inlets runs through the top of the drill bit steel body, the first layer of water inlets and the second layer of water inlets are both connected to the drill bit steel body, water grooves distributed along one side of the first layer of water inlets are arranged on the inner and outer side walls of the drill bit steel body, and a plurality of gauge strips located between the first diamond block and the second diamond block are circumferentially embedded on the outer side wall of the drill bit steel body.

2. A double-layer nozzle diamond core drill bit according to claim 1, characterized in that: A water inlet groove communicated with the water tank is provided at the bottom of the tire block embedding groove.

3. A double-layer nozzle diamond core drill bit according to claim 2, characterized in that: The width of the upper part of the water tank is greater than the width of the lower part of the water tank.

4. A double-layer nozzle diamond core drill bit according to claim 1, characterized in that: The height difference between two adjacent first diamond blocks is α, and the height difference between two adjacent second diamond blocks is β, wherein α<β, and α is greater than the height of the non-working layer of the blocks.

5. A double-layer nozzle diamond core drill bit according to claim 1, characterized in that: The bottom surface of the first diamond green block is higher than the top surface of the second diamond green block adjacent to the first diamond green block in one direction.

6. A double-layer nozzle diamond core drill bit according to claim 1, characterized in that: A water retaining strip is embedded on the outer side wall of the drill bit steel body.

7. A double-layer nozzle diamond coring drill bit according to any one of claims 1 to 6, characterized in that: The method for making the diamond coring drill bit comprises the following steps: S1. Lathe processing of drill steel body The inner and outer walls of the steel body are processed by a lathe to form a cylindrical steel body with a through hole inside; a ring-shaped structure boss located below the tire block embedding groove is processed by a drill bit on the inner wall of the steel body, and the radius of the boss is smaller than the inner diameter of the steel body after forming; S2. Milling of drill steel body Use a milling machine to process the tire block embedding groove, the nozzle groove, the water groove on the outer wall of the steel body, the diameter protection strip embedding groove, and the water retaining strip embedding groove; S3. Processing of the water groove on the inner wall of the drill bit steel body A water tank on the inner wall of a steel body that is wire-cut on a wire-cut machining bed; S4. Processing of graphite mold Processing to form a cylindrical graphite mold, whose diameter is equal to the inner diameter of the steel body, and whose length is equal to the length of the tire block embedded in the groove, and the length from the top surface of the annular boss formed in the turning process to the top surface of the drill steel body; S5. Processing of water retaining strips In the initial stage of wire cutting processing of water retaining strips on the wire cutting machine, the curved part is polished with a grinding wheel; S6, welding of diamond tire blocks, gauge strips and water retaining strips The processed graphite mold is placed on the upper side of the drill bit steel body, and on the annular boss formed during lathe processing. After stabilization, the first diamond embryo block and the second diamond embryo block are assembled, and the first diamond embryo block and the second diamond embryo block are respectively assembled into each embryo block embedding groove, and the gauge strip is assembled into the gauge strip embedding groove, and the water retaining strip is assembled into the water retaining strip embedding groove; The first diamond block, the second diamond block, the gauge strip and the water retaining strip are subjected to high frequency welding; After the drill bit steel body cools down, take out the graphite mold inside the drill bit steel body; S7. Reprocessing of drill steel body Using a lathe, the annular boss on the inner wall of the rigid body reserved in the initial processing is processed until its inner diameter is the same as the inner diameter of the drill steel body; The inner wall thread is processed to the design requirements; S8, Deep processing of drill steel body Remove the oxide layer on the surface of the drill steel body and perform fine machining on a grinder.

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