CN210685867U

CN210685867U - Concave diamond compact

Info

Publication number: CN210685867U
Application number: CN201921083010.0U
Authority: CN
Inventors: 艾丽; 韩飞飞
Original assignee: Sinopec Oilfield Equipment Corp; Sinopec Jiangzuan Petroleum Machinery Co Ltd
Current assignee: Sinopec Oilfield Equipment Corp; Sinopec Jiangzuan Petroleum Machinery Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-06-05
Anticipated expiration: 2029-07-11

Abstract

The utility model relates to an indent diamond compact piece, including carbide base member and the diamond composite bed of setting in carbide base member upper end, its characterized in that diamond composite bed top surface be provided with a bowl shape cavity, form an annular tooth top surface in the tooth top outer fringe. The utility model discloses concave station cutting edge is constituteed to addendum face, interior concave surface and outside cylinder and chamfer. Compared with a plane tooth crest composite sheet, the concave table cutting edge has stronger stratum penetration, more concentrated cutting action force on compact plastic mudstone and higher rock breaking efficiency; compared with a conical-pointed or pointed-ridge composite sheet, the scraping surface of the concave table cutting edge is larger, repeated cutting on compact plastic mudstone is reduced, and the cutting efficiency is higher; meanwhile, the concave surface is beneficial to the dissipation of cutting friction heat, the heat damage or tooth breakage of the diamond composite layer caused by insufficient heat dissipation is reduced, and the service life of the drill bit is prolonged.

Description

Concave diamond compact

Technical Field

The utility model relates to an indent diamond compact piece that is used for well drilling diamond bit such as oil, geology, mine.

Background

The existing diamond composite sheet has excellent wear resistance and impact resistance, and is widely used in the drilling fields of petroleum, mines and the like. Besides material performance, the shape of the composite sheet is gradually turned to a special-shaped structure from a cylindrical block shape, so that the speed increasing requirement of the drill bit when the drill bit encounters a stratum with compact mudstone, hard plastic mudstone and soft and hard rock staggered change is further matched.

The existing special-shaped structure composite sheet mainly takes the protruding diamond cutting edge as the conical tip shape and the pointed ridge shape, the mode of the conventional composite sheet to the stratum is converted into ridge plough cutting by surface scraping, the stress damage of the cutting teeth to the stratum is enhanced, and the cutting efficiency is further improved. The ridge plough rock breaking efficiency is high, the using effect is better in a siltstone stratum and a hard interlayer with abrasiveness, but the cutting efficiency is reduced due to narrow cutting edges, low cutting chip removal efficiency and easy repeated cutting in compact and plastic mudstone.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that not enough to above-mentioned prior art exists provides one kind to fine and close, the plasticity mudstone nature of eating is better, cutting efficiency is high to the indent diamond compact piece that has general applicability.

The utility model discloses a solve the technical scheme that the problem that the aforesaid provided adopted and be: the diamond composite layer is characterized in that a bowl-shaped concave cavity is arranged on the top surface of the diamond composite layer, and an annular tooth top surface is formed on the outer edge of a tooth top.

According to the scheme, the radial single-side width w of the annular tooth crest surface is 0.5-3 mm.

According to the scheme, the bowl-shaped concave cavity is in a shape of a circular truncated cone, a frustum of a pyramid, a spherical frustum or an elliptical frustum.

According to the scheme, the bowl-shaped concave cavity is in a double-step layer shape, and an annular transition step is arranged between the upper layer concave cavity and the lower layer concave cavity.

According to the scheme, the upper layer cavity is in a shape of a circular truncated cone, the single-side taper angle β of the upper layer cavity is 75-50 degrees, the lower layer cavity is in a shape of a circular truncated cone, and the single-side taper angle α of the lower layer cavity is 75-40 degrees.

According to the scheme, the upper-layer cavity is in a spherical frustum shape, a single-side cone angle β formed by connecting the upper end face and the lower end face is 75-50 degrees, the lower-layer cavity is in a circular frustum shape, and a single-side cone angle α is 75-40 degrees.

According to the scheme, the axial thickness of the diamond composite layer is 2.5-4 mm, and the axial depth of the bowl-shaped concave cavity is 1.5-3 mm.

According to the scheme, the diamond compact formed by the hard alloy substrate and the diamond composite layer is a cylinder or an elliptic cylinder.

According to the scheme, the outer edge of the end face of the diamond composite layer is provided with a chamfer.

According to the scheme, the diamond composite layer is a polycrystalline diamond composite layer or a thermal stability polycrystalline diamond composite layer.

According to the technical scheme, the bonding interface between the diamond composite layer and the hard alloy substrate is a plane, a concave-convex surface or a groove surface.

The beneficial effects of the utility model reside in that: 1. the end face of the diamond composite layer is provided with a bowl-shaped concave cavity, the outer edge of the tooth top forms an annular tooth top surface, and the tooth top surface, the inner concave surface, the outer side cylindrical surface and the chamfer form a concave cutting edge. Compared with a plane tooth crest composite sheet, the concave table cutting edge has stronger stratum penetration, more concentrated cutting action force on compact plastic mudstone and higher rock breaking efficiency; 2. compared with a conical-pointed or pointed-ridge composite sheet, the scraping surface of the concave table cutting edge is larger, repeated cutting on compact plastic mudstone is reduced, and the cutting efficiency is higher; 3. a transition section in the descending of the concave surface is additionally arranged, so that the supporting force on the cutting working surface of the concave table is improved; and the concave surface is beneficial to the dissipation of cutting friction heat, the heat damage or tooth breakage of the diamond composite layer caused by insufficient heat dissipation is reduced, and the service life of the drill bit is prolonged.

Drawings

Fig. 1 is a perspective structural view of an embodiment of the present invention.

Fig. 2 is a front cross-sectional view of an embodiment of the present invention.

Fig. 3 is a perspective view of another embodiment of the present invention.

Fig. 4 is a front sectional view of another embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The first embodiment is shown in fig. 1 and 2, and comprises a hard alloy substrate 2 and a diamond composite layer 1 arranged at the upper end of the hard alloy substrate, wherein a cylindrical diamond composite sheet is formed, the diameter of the composite sheet is 15.8mm, the height of the composite sheet is 13.2mm, the diamond composite layer is a polycrystalline diamond composite layer, a bowl-shaped concave cavity with a large end facing upwards is arranged on the top surface of the diamond composite layer, an annular tooth top surface 3 is formed at the outer edge of a tooth top, the radial single-side width w of the annular tooth top surface is 1.2mm, a chamfer is arranged at the outer edge of the end surface of the diamond composite layer, namely the outer edge of the annular tooth top surface, the bowl-shaped concave cavity is in a double-step layer shape and comprises an upper concave cavity 4 and a lower concave cavity 5, an annular transition step 6 is arranged between the upper concave cavity and the lower concave cavity, the upper concave cavity is in a spherical table shape, namely a revolution generatrix of the concave cavity is in an arc shape, the arc radius r1 is 2.5mm, the large-end revolution radius r4 of the spherical table surface is 6 degrees, the small-end revolution radius r2 is 4.2mm, the small-end revolution radius r2 is about 3897.7 mm, the bottom surface of the bowl-shaped concave cavity is in a cone angle of the bowl-shaped concave cavity, the bowl-shaped concave cavity is in a parallel cone depth of the bowl-shaped concave surface of the bowl-shaped concave cavity, the.

The second embodiment is shown in fig. 3 and 4, and is different from the previous embodiment in that the upper layer cavity is truncated cone-shaped, namely, the revolution generatrix of the upper layer cavity is oblique line, the single-side taper angle α of the upper layer cavity is 54 degrees, the radial single-side width w of the annular tooth top surface is 1.4mm, and other structures are basically the same as the previous embodiment.

The utility model discloses a diamond composite bed forms with the sintering of carbide base member under superhigh pressure high temperature condition, and the shape accessible of composite bed designs into the shape of two-layer formula composite bed with interior synthetic mould, and the resintering, the obtaining of polishing.

Claims

1. The concave diamond composite sheet comprises a hard alloy substrate and a diamond composite layer arranged at the upper end of the hard alloy substrate, and is characterized in that a bowl-shaped concave cavity is arranged on the top surface of the diamond composite layer, and an annular tooth top surface is formed at the outer edge of a tooth top.

2. The concave diamond compact as recited in claim 1 wherein said annular crest radial single side width w is in the range of 0.5 mm to 3 mm.

3. A concave diamond compact as claimed in claim 1 or claim 2, wherein said bowl-shaped cavity is in the shape of a truncated cone, a truncated pyramid, a truncated sphere, or an elliptical frustum.

4. A concave diamond compact as claimed in claim 1 or claim 2 wherein the bowl-shaped cavity is a double step, with an annular transition step between the upper cavity and the lower cavity.

5. The concave diamond compact of claim 4, wherein said upper cavity is frustoconical with a single taper angle β of 75 ° -50 °, and said lower cavity is frustoconical with a single taper angle α of 75 ° -40 °.

6. The concave diamond compact of claim 4, wherein said upper cavity is in the shape of a spherical frustum and has a single taper angle β between 75 ° and 50 ° formed by the connection of its upper and lower end surfaces, and said lower cavity is in the shape of a truncated cone having a single taper angle α between 75 ° and 40 °.

7. The concave diamond compact as set forth in claim 1 or 2, wherein the axial thickness of said diamond composite layer is 2.5-4 mm, and the axial depth of said bowl-shaped cavity is 1.5-3 mm.

8. The recessed diamond compact of claim 1 or 2, wherein the diamond compact formed by the cemented carbide substrate and the diamond composite layer is a cylinder or an elliptical cylinder.

9. A concave diamond compact as claimed in claim 1 or claim 2, wherein the outer edge of the end face of the diamond composite layer is chamfered.

10. A concave diamond compact as claimed in claim 1 or claim 2, wherein the diamond composite layer is a polycrystalline diamond composite layer or a thermally stable polycrystalline diamond composite layer; the bonding interface between the diamond composite layer and the hard alloy substrate is a plane, a concave-convex surface or a groove surface.