Compact mudstone stratum coring bit suitable for sandstone type uranium mine geological drilling

Abstract

The invention belongs to the technical field of sandstone type uranium ore geological drilling, and particularly relates to a compact mudstone stratum coring bit suitable for sandstone type uranium ore geological drilling. According to the drill bit, the inner cutting teeth and the outer cutting teeth are arranged in a staggered mode, the top ends of the inner cutting teeth and the outer cutting teeth are located at different heights and are arranged in a stepped mode, so that in the rotating process of the drill bit, the high-position cutting teeth firstly make contact with a stratum for cutting to form a broken free face, and the low-position cutting teeth further cut to expand the formed cutting free face; a stratum cutting free surface is enlarged compared with a drill bit in the prior art, so that the effect of improving the drilling efficiency is achieved. In addition, the water gaps are evenly distributed close to the cutting teeth, and cut rock debris is removed in time.

Description

Technical Field

[0001] This invention belongs to the field of geological drilling technology for sandstone-type uranium deposits, specifically relating to a core drill bit suitable for drilling dense mudstone formations in sandstone-type uranium deposits. Background Technology

[0002] In geological drilling of sandstone-type uranium deposits, it is often necessary to encounter situations where core drilling is required in a large number of dense mudstone strata. Due to the special characteristics of dense mudstone strata, such as fine grains, high density, high hardness, and high strength, conventional core drilling bits cannot effectively penetrate such strata. This usually results in volumetric damage, with the drill bit repeatedly scratching or breaking on the rock surface. Consequently, the drill bit experiences severe slippage in dense mudstone strata of sandstone-type uranium deposits, leading to slow drilling speed, waste of construction resources, and seriously affecting the construction efficiency and overall benefits of the drilling project. Summary of the Invention

[0003] To overcome the problems existing in related technologies, a core drilling bit suitable for drilling tight mudstone formations in sandstone-type uranium deposits is provided.

[0004] According to one aspect of the present disclosure, a core drill bit for drilling tight mudstone formations in sandstone-type uranium deposits is provided, the drill bit comprising: a plurality of internal cutting teeth, a plurality of external cutting teeth, a matrix, and a gauge alloy;

[0005] The tire body is a hollow cylinder. Multiple internal cutting teeth and multiple external cutting teeth are fixedly connected to the upper end of the tire body. Multiple internal cutting teeth are evenly distributed around the axis of the tire body to form an inner ring, and multiple external cutting teeth are evenly distributed around the axis of the tire body to form an outer ring. The outer ring is farther away from the axis of the tire body than the inner ring. Multiple sprue openings are opened along the axial direction of the tire body. Each sprue opening is located inside the inner ring, and the arrangement position of each sprue opening is adjacent to one of the internal cutting teeth.

[0006] The internal and external cutting teeth are arranged alternately, and the tips of the internal and external cutting teeth are arranged in a stepped manner at different heights.

[0007] In one possible implementation, the inner and outer cutting teeth are pointed, and diamond composite sheets are welded to the cutting surfaces of the inner and outer cutting teeth that are in contact with the formation. Each diamond composite sheet matches the shape of the welded inner or outer cutting tooth.

[0008] In one possible implementation, the tips of the internal cutting teeth are located at a first height, and the tips of the external cutting teeth are located at a second height, with the first height being higher than the second height.

[0009] In one possible implementation, the first height and the second height differ by 6 to 7 mm.

[0010] In one possible implementation, each inner cutting tooth is positioned in front of the adjacent outer cutting tooth in a direction of counterclockwise rotation around the tire body axis.

[0011] In one possible implementation, the distance between the front end of the internal cutting tooth and the front end of the adjacent external cutting tooth is at least 5 mm.

[0012] In one possible implementation, the outer surface of the external cutting teeth away from the axis of the tire body is inlaid with gauge-protecting alloys, each gauge-protecting alloy being a long strip extending along the axial direction.

[0013] In one possible implementation, the tip height of the sprue is greater than the sum of the tip heights of the internal and external cutting teeth.

[0014] In one possible implementation, the internal and external cutting teeth are integrally formed with the drill bit body.

[0015] In one possible implementation, the lower outer side of the drill bit body is provided with connecting threads, through which the drill bit is connected to the drill rod or drill rod reducer.

[0016] According to another aspect of the present disclosure, a non-volatile computer-readable storage medium is provided, on which computer program instructions are stored, which, when executed by a processor, implement the above-described method.

[0017] The beneficial effects of this disclosure are as follows: The internal and external cutting teeth of the drill bit are arranged alternately, and the tips of the internal and external cutting teeth are arranged in a stepped manner at different heights. This allows the higher-positioned cutting teeth to contact the formation first during drill bit rotation, forming a fractured free surface. The lower-positioned cutting teeth further cut, expanding the already formed free surface. This results in a larger free surface for formation cutting compared to existing drill bits, thereby improving drilling efficiency. Furthermore, the water inlets are evenly distributed close to the cutting teeth, promptly removing the cut rock debris. Attached Figure Description

[0018] Figure 1 This is a perspective view of a core drill bit for dense mudstone formations used in geological drilling of sandstone-type uranium deposits, as shown in an embodiment of this disclosure.

[0019] Figure 2 This is a top view of a core drill bit for dense mudstone formations used in geological drilling of sandstone-type uranium deposits, as shown in an embodiment of this disclosure.

[0020] In the picture:

[0021] 1: Internal cutting teeth; 2: External cutting teeth; 3: Carcass; 4: Connecting threads; 5: Sprue.

[0022] 6: Diameter-maintaining alloy. Detailed Implementation

[0023] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Unless otherwise defined, the technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains; the terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the term "comprising" and any variations thereof in this disclosure are intended to cover non-exclusive inclusion. Clearly, the embodiments described in this disclosure are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0025] In this disclosure, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] See Figure 1 and Figure 2 The disclosed core drill bit for drilling tight mudstone formations in sandstone-type uranium deposits includes: multiple internal cutting teeth 1, multiple external cutting teeth 2, a matrix 3, and a gauge alloy 6. The matrix 3 is a hollow cylinder. Multiple internal cutting teeth 1 and multiple external cutting teeth 2 are fixedly connected to the upper end of the matrix 3. The multiple internal cutting teeth 1 are evenly distributed around the axis of the matrix 3 to form an inner ring, and the multiple external cutting teeth 2 are evenly distributed around the axis of the matrix 3 to form an outer ring. The outer ring is farther away from the axis of the matrix 3 than the inner ring. Multiple water outlets 5 are opened along the axial direction of the matrix 3. Each water outlet 5 is located inside the inner ring, and the arrangement of each water outlet 5 is adjacent to an internal cutting tooth 1, thereby enabling timely removal of cut rock cuttings. The internal cutting teeth 1 and external cutting teeth 2 are arranged alternately, and the tips of the internal cutting teeth 1 and external cutting teeth 2 are arranged at different heights in a stepped manner.

[0027] In one possible implementation, the inner cutting tooth 1 and the outer cutting tooth 2 are pointed teeth. The inner cutting tooth 1 and the outer cutting tooth 2 are used to weld diamond composite sheets to the cutting surfaces that are in contact with the formation. Each diamond composite sheet matches the shape of the welded inner cutting tooth 1 or outer cutting tooth 2.

[0028] In one possible implementation, the tip of each internal cutting tooth 1 is located at a first height, and the tip of each external cutting tooth 2 is located at a second height. The first height is higher than the second height, for example, the difference between the first height and the second height is 6 to 7 mm.

[0029] In one possible implementation, in the direction of counterclockwise rotation around the axis of the tire body 3, each inner cutting tooth 1 is located in front of the adjacent outer cutting tooth 2, and the distance between the front end of the inner cutting tooth 1 and the front end of the adjacent outer cutting tooth 2 is at least 5 mm.

[0030] In one possible implementation, the outer surface of the external cutting teeth 2 away from the axis of the body 3 is inlaid with a gauge-protecting alloy 6, each gauge-protecting alloy 6 being a long strip extending along the axial direction.

[0031] In one possible implementation, the top height of the nozzle 5 is greater than the sum of the top heights of the inner cutting tooth 1 and the outer cutting tooth 2, so that the water flow discharged from the nozzle 5 can wash the surfaces of the inner cutting tooth 1 and the outer cutting tooth 2.

[0032] In one possible implementation, the internal cutting teeth 1 and the external cutting teeth 2 are integrally formed with the drill bit body 3, thereby increasing the overall strength of the drill bit.

[0033] In one possible implementation, the lower outer side of the drill bit body 3 is provided with a connecting thread 4, which is a positive external thread.

[0034] In use, the drill bit is connected to the drill rod or drill rod reducer via connecting thread 4. Once lowered into the hole, it is drilled uniformly using appropriate drilling parameters based on the physical and mechanical properties of the formation. During drill bit rotation, the inner cutting teeth 1 first contact the formation and cut, forming a fractured free surface. The outer cutting teeth 2 further cut on the outside, expanding the already formed cutting free surface. This increases the relative size of the formation cutting free surface compared to traditional drill bits, thereby improving drilling efficiency. Furthermore, the water inlets are evenly distributed close to the cutting teeth, promptly removing cut rock debris. The gauge-protecting alloy protects the outer diameter of the drill bit, extending its service life.

[0035] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A core drilling bit suitable for drilling tight mudstone formations in sandstone-type uranium deposits, characterized in that, The drill bit includes: multiple internal cutting teeth, multiple external cutting teeth, a matrix, and a gauge alloy; The tire body is a hollow cylinder. Multiple internal cutting teeth and multiple external cutting teeth are fixedly connected to the upper end of the tire body. Multiple internal cutting teeth are evenly distributed around the axis of the tire body to form an inner ring, and multiple external cutting teeth are evenly distributed around the axis of the tire body to form an outer ring. The outer ring is farther away from the axis of the tire body than the inner ring. Multiple sprue openings are opened along the axial direction of the tire body. Each sprue opening is located inside the inner ring, and the arrangement position of each sprue opening is adjacent to one of the internal cutting teeth. The internal and external cutting teeth are arranged alternately, and the tips of the internal and external cutting teeth are arranged in a stepped manner at different heights.

2. The drill bit according to claim 1, characterized in that, The internal and external cutting teeth are pointed in shape. The cutting surfaces of the internal and external cutting teeth that are in contact with the formation are inlaid with diamond composite sheets. Each diamond composite sheet is matched with the shape of the inlaid internal or external cutting tooth.

3. The drill bit according to claim 1, characterized in that, The tips of each internal cutting tooth are located at a first height, and the tips of each external cutting tooth are located at a second height, with the first height being higher than the second height.

4. The drill bit according to claim 3, characterized in that, The difference between the first and second heights is 6-7 mm.

5. The drill bit according to claim 1, characterized in that, In the direction of counterclockwise rotation around the tire body axis, each internal cutting tooth is located in front of the adjacent external cutting tooth.

6. The drill bit according to claim 5, characterized in that, The distance between the front end of the internal cutting tooth and the front end of the adjacent external cutting tooth is at least 5 mm.

7. The drill bit according to claim 1, characterized in that, The outer surface of the external cutting teeth away from the axis of the tire body is inlaid with gauge-protecting alloy, and each gauge-protecting alloy is a long strip extending along the axis.

8. The drill bit according to claim 1, characterized in that, The height of the top of the sprue is greater than the sum of the heights of the tops of the internal and external cutting teeth.

9. The drill bit according to claim 1, characterized in that, The internal and external cutting teeth are integrally formed with the drill bit body.

10. The drill bit according to claim 1, characterized in that, The lower outer side of the drill bit body is provided with connecting threads, through which the drill bit is connected to the drill rod or drill rod reducer.

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