WO2018000781A1 - Double-cutting impregnated diamond drill - Google Patents

Abstract

Disclosed is an impregnated diamond drill bit having a double cutting structure. The impregnated diamond drill bit comprises an API connector (12), a drill body (11) connected to the API connector (12). A central channel (2), a plurality of blades (13) and a water channel between two adjacent blades (13) are provided on the drill body (11). On an upper surface of the blades (13), double-cutting structure impregnated A1-type teeth (1), impregnated A-type teeth (4), impregnated B-type teeth (5), impregnated C-type teeth (6) and double-cutting structure impregnated A2-type teeth are provided. Cutting surfaces of the double-cutting structure of the impregnated A1-type teeth (1) and the double-cutting structure of the impregnated A2-shaped teeth (8) are embed with large particles of natural diamond, and the internal of the same are uniformly arranged with small particles of artificial diamond. Small particles of diamond are arranged in the impregnated A-type teeth (4), the impregnated B-type teeth (5) and the impregnated C-shaped teeth (6). The present application solves the problem that the diamond cutting bit of the single cutting structure in the prior art has a short life span in complicated strata which are difficult for drilling, and has a negative impact on geological prospecting.

Description

Impregnated diamond drill bit with double cutting structure Technical field

A diamond-shaped drill bit with double-cutting structure for drilling, belonging to the technical field of drilling equipment such as petroleum natural gas, mining engineering, construction foundation engineering construction, geology and hydrology.

Background technique

The impregnated diamond drill bit uses small-grain diamond as the cutting component. It has the characteristics of high pressure resistance, strong anti-wear ability and good impact resistance. It is suitable for drilling formations that are difficult to drill for PDC and cone bits, and has high hardness. High abrasiveness, etc. However, the existing design of the diamond-inlaid diamond drill bit uses diamond particles which are finer and have a low volumetric crushing efficiency for the rock formation. Due to the high interface energy between the diamond and the carcass, the wettability and bonding ability between the diamond and the carcass are poor, the bonding strength is low, and the strength of the carcass is insufficient and the premature wear causes the diamond particles to fall off prematurely. The impregnated diamond drill bit with a single cutting structure has a short life span in difficult-to-drill, complex formation diamond inserts, which adversely affects geological exploration.

Summary of the invention

The present invention provides a diamond-impregnated drill bit with a double-cut structure for solving the above-mentioned deficiencies, and solves the problem of a diamond-shaped drill bit with a single cutting structure in the prior art, and has a short life span for difficult drilling and complicated formation diamond impregnation, for geological exploration. Problems that cause adverse effects.

In order to achieve the above object, the technical solution adopted by the present invention is:

A diamond-impregnated drill bit having a double-cut structure, comprising an API joint and a bit body connected to the API joint, characterized in that: a central water channel, a plurality of blades, and an adjacent two blades are disposed on the bit body The water channel is provided with a double-cut structure on the upper surface of the blade, a type A1 tooth, a type A tooth, a B-type tooth, a C-type tooth and a double-cut structure A2 type tooth; The structure is impregnated with A1 teeth and double-cutting structure. The cutting surface of the A2 type teeth is inlaid with large particles of natural diamond, and the interior is evenly arranged with small-grain diamonds, and the A-shaped teeth, the impregnated B-shaped teeth and the impregnated Small grain diamond is placed in the C-shaped tooth.

Further, a reinforcing gauge is provided on each of the blades.

Further, the water channel formed between the blade wing and the reinforcing gauge is a radiant deep water channel, the large particle natural diamond is 20-25 mesh, and the small particle diamond is 25-50 mesh.

Further, the blade includes a long blade and a short blade, and at least two sets of long blades are connected at the core of the drill bit, and the long blade is provided with a PDC composite sheet at the joint of the drill bit.

Further, at the corresponding end of the API joint, at least one short blade is provided with a pregnant C-shaped tooth, a pregnant B-shaped tooth, a double-cut structure, an A1 type tooth, and a pregnant A-type from the end of the short blade. The teeth and double-cutting structure are impregnated with A2 teeth.

Further, at the corresponding end of the API joint, at least one short blade is provided with a pregnant C-shaped tooth, a double-cut structure, a pregnant A1 tooth, a pregnant A-shaped tooth and a double-cut structure, starting from the end of the short blade. Set with A2 teeth.

Further, at the corresponding end of the API joint, at least one short blade is provided with a pregnant C-shaped tooth, a double-cut structure, a pregnant A1 tooth, a pregnant A-shaped tooth, and a double-cut structure. Inlaid with A1 teeth, impregnated A-shaped teeth and double-cutting structure with A2 teeth.

Further, starting from the joint of the drill bit, at least one long blade is provided with a PDC composite sheet, a double-cut structure, an A1 type tooth, a pregnant A-shaped tooth, a double-cut structure, an A1 type tooth, and a pregnant A. The tooth and the double-cut structure are set with A2 teeth.

Further, starting from the joint of the drill bit, at least one long blade is provided with a PDC composite sheet, a pregnant A-shaped tooth, a double-cut structure, a pregnant A1 tooth, a pregnant A-shaped tooth and a double-cut structure. Type teeth.

Further, the blade is provided with a discontinuous cloth spacing groove, and the discontinuous cloth spacing groove has a double cutting structure for impregnating the A1 type tooth, the PDC composite piece, the impregnated A type tooth, the pregnant B type tooth, The impregnated C-shaped teeth and the double-cut structure are insulated from the A2 type teeth.

The advantages of the present invention over the prior art are:

1. The invention has a double-cutting structure, and adopts a large-grained natural diamond and a small-grained diamond as a cutting component, and a large-grain natural diamond as a cutting component can improve the rock crushing efficiency, and the large particle-shaped day of the watch. However, after the diamond cutting process is finished, the small diamonds in the impregnation start to cut the broken rock, which can improve the mechanical drilling speed and the life of the drill bit;

Second, the invention adopts a discontinuous intermittent tooth design, and each of the cutting teeth has a gap, which is easy to be removed under high rotation speed, preventing the occurrence of bit burnt due to poor hydraulic effect, and improving the mechanical drill. speed;

Third, the invention adopts a multi-shape structure of the mixed tooth tooth design to improve the diamond content of the drill bit and improve the life of the impregnated diamond bit;

Fourth, the PDC cutting tooth structure of the drill core is designed to avoid the occurrence of the core phenomenon of the weak core of the drill bit during the high-speed drilling process, and improve the life of the drill bit;

5. The present invention adopts a central waterway and a radiant deepwater channel design to improve the migration capability of the cuttings at high drilling speeds.

DRAWINGS

Figure 1 is a plan view of the present invention;

Figure 2 is a perspective view of the present invention;

Figure 3 is a schematic view of the indented A-shaped tooth of the present invention;

Figure 4 is a schematic view of a B-type tooth in the present invention;

Figure 5 is a schematic view showing the double-cut structure of the present invention in the A2 type tooth;

Figure 6 is a schematic view showing the double-cut structure in the present invention;

Figure 7 is a schematic view of a C-shaped tooth in the present invention.

detailed description

The invention will now be further described with reference to the accompanying drawings and embodiments.

Example 1

A diamond-impregnated drill bit having a double-cut structure, comprising an API joint 12, a bit body 11 connected to the API joint 12, and a central water channel 2, a plurality of blades 13 and two adjacent blades 13 are disposed on the bit body 11. Between the waterways, in The upper surface of the blade 13 is provided with a double-cut structure impregnated A1 type tooth 1, a pregnant A-shaped tooth 4, a pregnant B-shaped tooth 5, a pregnant C-shaped tooth 6 and a double-cut structure impregnated A2 type tooth 8; The double-cut structure is embedded in the A1 tooth 1, the pregnant A-shaped tooth 4, the pregnant B-shaped tooth 5, the pregnant C-shaped tooth 6 and the double-cut structure impregnated A2 tooth 8 are designed on the blade 13 Double-cutting structure impregnated with A1 type 1 and double-cutting structure. The cutting surface of the A2 type tooth 8 is inlaid with large particles of natural diamond, and the inside is evenly arranged with small-grain diamonds. In the presence of A-shaped teeth 4, impregnated B Small particles of diamond are disposed in the tooth 5 and the impregnated C tooth 6. The use of large-grained natural diamonds and impregnated small-grain diamonds as cutting elements, and the use of large-grained natural diamonds as cutting elements can improve the rock crushing efficiency, and the large-grained natural diamonds in the table are peeled off during the cutting process. Small grain diamonds begin to cut broken rock, which can improve the drilling speed and bit life of the drill bit.

Example 2

A diamond-impregnated drill bit having a double-cut structure, comprising an API joint 12, a bit body 11 connected to the API joint 12, and a central water channel 2, a plurality of blades 13 and two adjacent blades 13 are disposed on the bit body 11. Between the water channels, the upper surface of the blade 13 is provided with a double-cut structure, the A1 type tooth, the A-shaped tooth 4, the B-type tooth 5, the C-shaped tooth 6 and the double-cut structure. Inlaid with A2 type tooth 8; mixed design of double-cutting structure impregnated with A1 tooth 1, pregnant A-shaped tooth 4, pregnant B-shaped tooth 5, impregnated C-shaped tooth 6 and double-cut structure impregnated A2 tooth 8 On the blade 13 , the cutting surface of the double-cut structure A1 type tooth 1 and the double-cut structure A2 type tooth 8 are inlaid with large particles of natural diamond, and the inside is evenly arranged with small grain diamonds. Small particles of diamond are disposed in the teeth 4, the impregnated B-shaped teeth 5, and the impregnated C-shaped teeth 6. The use of large-grained natural diamonds and impregnated small-grain diamonds as cutting elements, and the use of large-grained natural diamonds as cutting elements can improve the rock crushing efficiency, and the large-grained natural diamonds in the table are peeled off during the cutting process. Small grain diamonds begin to cut broken rock, which can improve the drilling speed and bit life of the drill bit. The blade 13 includes a long blade 14 and a short blade 15, at least two sets of long blades 14 are connected at the center of the drill bit, and the long blade 14 is provided with a PDC composite sheet 3 at the joint of the bit. On the corresponding end of the API joint 12, starting from the end of the short blade 15, at least one short blade 15 is provided with a pregnant C-shaped tooth 6, a pregnant B-shaped tooth 5, and a double-cut structure A1 type tooth. Pregnancy type A tooth 4 and double cutting structure impregnated with A2 type tooth 8; in API joint 12 phase On the corresponding end, starting from the end of the short blade 15, at least one short blade 15 is provided with a pregnant C-shaped tooth 6, a double-cut structure, an A1 tooth, a pregnant A-shaped tooth 4 and a double-cut structure. A2 type tooth 8; at the corresponding end of the API joint 12, starting from the end of the short blade 15, at least one short blade 15 is sequentially provided with a pregnant C-shaped tooth 6, a double-cut structure, a pregnant A1 type tooth 1, and a pregnant setting A-type tooth 4, double-cutting structure impregnated with A1 type teeth 1, impregnated A-type teeth 4 and double-cutting structure impregnated with A2 type teeth 8; at least one long blade 14 is arranged in turn from the joint of the bit center PDC composite sheet 3, double-cut structure, impregnated A1 type tooth 1, pregnant A-type tooth 4, double-cut structure, impregnated A1 type tooth 1, pregnant A-shaped tooth 4, and double-cut structure, impregnated with A2 type tooth 8; At the beginning of the joint of the drill bit, at least one long blade 14 is provided with a PDC composite sheet 3, a pregnant A-shaped tooth 4, a double-cut structure, a pregnant A1 tooth, a pregnant A-shaped tooth 4 and a double-cut structure. Set with A2 teeth 8. The use of a variety of shape structure of the mixed tooth tooth design, improve the diamond content of the drill bit, improve the life of the diamond drill bit, the PDC cutting tooth structure of the drill core, to avoid the phenomenon of the core of the drill bit appearing during the high-speed drilling process, Improve bit life.

Example 3

A diamond-impregnated drill bit having a double-cut structure, comprising an API joint 12, a bit body 11 connected to the API joint 12, and a central water channel 2, a plurality of blades 13 and two adjacent blades 13 are disposed on the bit body 11. Between the water channels, the upper surface of the blade 13 is provided with a double-cut structure, the A1 type tooth, the A-shaped tooth 4, the B-type tooth 5, the C-shaped tooth 6 and the double-cut structure. Inlaid with A2 type tooth 8; mixed design of double-cutting structure impregnated with A1 tooth 1, pregnant A-shaped tooth 4, pregnant B-shaped tooth 5, impregnated C-shaped tooth 6 and double-cut structure impregnated A2 tooth 8 On the blade 13 , the cutting surface of the double-cut structure A1 type tooth 1 and the double-cut structure A2 type tooth 8 are inlaid with large particles of natural diamond, and the inside is evenly arranged with small grain diamonds. Small particles of diamond are disposed in the teeth 4, the impregnated B-shaped teeth 5, and the impregnated C-shaped teeth 6. The use of large-grained natural diamonds and impregnated small-grain diamonds as cutting elements, and the use of large-grained natural diamonds as cutting elements can improve the rock crushing efficiency, and the large-grained natural diamonds in the table are peeled off during the cutting process. Small grain diamonds begin to cut broken rock, which can improve the drilling speed and bit life of the drill bit. The blade 13 includes a long blade 14 and a short blade 15, at least two sets of long blades 14 are connected at the center of the drill bit, and the long blade 14 is provided with a PDC composite sheet 3 at the joint of the bit. On the corresponding end of the API connector 12, from Starting from the end of the short blade 15 , at least one short blade 15 is provided with a pregnant C-shaped tooth 6 , a pregnant B-shaped tooth 5 , a double-cut structure, a pregnant A1 tooth, a pregnant A-shaped tooth 4 and a double cutting structure. The A2 type tooth 8 is impregnated; at the corresponding end of the API joint 12, at least one short blade 15 is provided with a pregnant C-shaped tooth 6 and a double-cut structure A1 type tooth 1 from the end of the short blade 15 The A-shaped tooth 4 and the double-cut structure are impregnated with the A2 tooth 8; at the corresponding end of the API joint 12, at least one short blade 15 is provided with a pregnant C-shaped tooth 6 from the end of the short blade 15 Double-cutting structure impregnated with A1 tooth 1, pregnant A-shaped tooth 4, double-cut structure impregnated with A1 tooth 1, pregnant A-shaped tooth 4 and double-cut structure with A2 tooth 8; Initially, at least one long blade 14 is provided with a PDC composite sheet 3 in sequence, a double-cut structure, an A1 type tooth, a pregnant A-shaped tooth 4, a double-cut structure, an A1 type tooth, and a pregnant A-shaped tooth 4. And the double-cutting structure is impregnated with the A2 type tooth 8; from the joint of the drill bit, at least one long blade 14 is provided with a PDC composite sheet 3, a pregnant A-shaped tooth 4, and a double-cut structure impregnated with the A1 type tooth 1 A tooth-impregnated cutting structure 4 and the double teeth 8 Impregnated type A2. The use of a variety of shape structure of the mixed tooth tooth design, improve the diamond content of the drill bit, improve the life of the diamond drill bit, the PDC cutting tooth structure of the drill core, to avoid the phenomenon of the core of the drill bit appearing during the high-speed drilling process, Improve bit life. The blade 13 is provided with a discontinuous cloth spacing groove 7 for the double cutting structure to be inlaid with the A1 type tooth 1, the PDC composite piece 3, the impregnated A type tooth 4, the pregnant B type tooth 5, and the pregnant C type tooth. 6 and the double-cut structure is insulated from the A2 type tooth 8 phase. The discontinuous intermittent tooth design is adopted, and there is a gap between each cutting tooth, which is easy to remove the cuttings at high speed, prevent the occurrence of bit burning due to poor hydraulic effect, and improve the drilling speed.

In the present invention, the blade 13 is provided with a reinforcing gauge 10 at one end of the API joint 12, and a water passage formed between the blade 13 and the reinforcing gauge 10 is a radiant s deep channel 9 The large-grain natural diamond is 20 to 25 mesh, and the small-grain diamond is 25 to 50 mesh. The size of the PDC composite sheet 3 is φ 13.44*8.0, and may be another size.

Claims (10)

A diamond-impregnated drill bit having a double-cut structure, comprising an API joint (12) and a bit body (11) connected to the API joint (12), characterized in that a central water channel is provided on the bit body (11) (2) ), a plurality of blades (13) and a water channel between two adjacent blades (13), on the upper surface of the blade (13) is provided with a double-cut structure impregnated with A1 type teeth (1), impregnated A Type teeth (4), impregnated B type teeth (5), impregnated C type teeth (6) and double cutting structure impregnated with A2 type teeth (8); in the double cutting structure impregnated with A1 type teeth (1) and double The cutting surface of the cutting structure of the A2 type tooth (8) is inlaid with large particles of natural diamond, and the internal uniform and orderly arrangement of small grain diamonds, in the type A tooth (4), the type B tooth (5) and pregnancy Small grain diamonds are placed in the C-shaped teeth (6). A diamond-impregnated drill bit having a double-cut structure according to claim 1, characterized in that a reinforcing gauge (10) is provided on each of the blades (13). A diamond-impregnated drill bit having a double-cut structure according to claim 2, wherein the water passage formed between the blade (13) and the reinforcing gauge (10) is a radiant deep channel (9). The large particle natural diamond is 20 to 25 mesh, and the small particle diamond is 25 to 50 mesh. A diamond-impregnated drill bit having a double-cut structure according to claim 1, wherein said blade (13) comprises a long blade (14) and a short blade (15), and at least two sets of long blades (14) Connected at the center of the bit, the long blade (14) is provided with a PDC composite sheet (3) at the joint of the bit. A diamond-impregnated drill bit having a double-cut structure according to claim 4, characterized in that at the corresponding end of the API joint (12), at least one short blade (15) is started from the end of the short blade (15). Top-mounted C-shaped teeth (6), impregnated B-shaped teeth (5), double-cutting structure impregnated A1 teeth (1), impregnated A-shaped teeth (4) and double-cutting structure impregnated A2 Tooth (8). A diamond-impregnated drill bit having a double-cut structure according to claim 4, characterized in that at the corresponding end of the API joint (12), at least one short blade (15) is started from the end of the short blade (15). The upper part is provided with a pre-set C-shaped tooth (6), a double-cut structure impregnated with an A1 type tooth (1), a pregnant A-shaped tooth (4) and a double-cut structure with an A2 type tooth (8). A diamond-impregnated drill bit having a double-cut structure according to claim 4, characterized in that at the corresponding end of the API joint (12), at least one short blade (15) is started from the end of the short blade (15). Top-mounted C-shaped teeth (6), double-cut structure, A1 type teeth (1), impregnated A-type teeth (4), double-cut structure, A1 type teeth (1), impregnated type A The teeth (4) and the double-cut structure are impregnated with A2 teeth (8). A diamond-impregnated drill bit having a double-cut structure according to claim 4, wherein at least one long blade (14) is provided with a PDC composite sheet (3) and a double from the joint of the drill bit core. The cutting structure is equipped with A1 type teeth (1), impregnated A type teeth (4), double cutting structure impregnated A1 type teeth (1), impregnated A type teeth (4) and double cutting structure impregnated A2 type teeth ( 8). A diamond-impregnated drill bit having a double-cut structure according to claim 4, wherein at least one long blade (14) is provided with a PDC composite sheet (3) in order from the joint of the drill bit core, Inset A-shaped teeth (4), double-cutting structure impregnated with A1 teeth (1), impregnated A-shaped teeth (4) and double-cutting structures with A2 teeth (8). A diamond-impregnated drill bit having a double-cut structure according to claim 4, wherein said blade (13) is provided with a discontinuous cloth spacing groove (7), said discontinuous cloth spacing groove (7) The double-cut structure is impregnated with A1 type teeth (1), PDC composite sheets (3), impregnated A-type teeth (4), pregnant B-type teeth (5), and pregnant C-shaped teeth (6) and The double-cut structure is insulated with the A2 type teeth (8).

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