A kind of polycrystalline diamond composite sheet and its application

A technology of polycrystalline diamond and composite sheet, which is applied to drilling equipment, earthwork drilling, drill bits, etc. It can solve the problems of difficult shaping, high hardness of cemented carbide, and strong wear resistance, which is beneficial to drilling speed and simplification. Manufacturing process, strong and reliable effect

Active Publication Date: 2017-12-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main problems in the treatment of conventional polycrystalline diamond composite sheets by the method of shaping: (1) the hard alloy has high hardness, strong wear resistance, and difficult shaping; (2) the shape of the shaped polycrystalline diamond composite sheet is irregular, which is not conducive to Welding; (3) The shaped polycrystalline diamond composite sheet destroys the original integrity of the polycrystalline diamond composite sheet and seriously affects the strength of the composite sheet

Method used

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  • A kind of polycrystalline diamond composite sheet and its application
  • A kind of polycrystalline diamond composite sheet and its application
  • A kind of polycrystalline diamond composite sheet and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a polycrystalline diamond compact, the schematic diagram of the polycrystalline diamond compact is as follows image 3 As shown, the polycrystalline diamond compact 4 includes a cemented carbide layer 1 and a polycrystalline diamond layer 2 . The composite interface of the polycrystalline diamond layer 2 and the cemented carbide layer 1 can be a plane or a concave-convex surface. The designed diameter of the polycrystalline diamond compact 4 is 16 mm, the thickness is 8 mm, and the included angle γ formed by the polycrystalline diamond layer 2 and the generatrices of the polycrystalline diamond compact 4 is 65°.

Embodiment 2

[0041] This embodiment provides the application of the polycrystalline diamond compact in embodiment 1 on a PDC drill bit. When the polycrystalline diamond compact 4 of Example 1 is applied to a PDC drill bit, when cutting the workpiece 3, the controllable backlash angle β is 10°, and the cutting angle α is 15°. The cutting schematic diagram is as follows Figure 4As shown, with this cutting structure, higher cutting efficiency can be obtained. In order to increase the durability of the polycrystalline diamond compact 4, it is recommended that the main part used for cutting be beveled at 0.4mm and 45°.

Embodiment 3

[0043] This embodiment provides a polycrystalline diamond composite sheet, the schematic diagram of the polycrystalline diamond composite sheet is as follows Figure 5 As shown, the polycrystalline diamond compact 4 includes a cemented carbide layer 1 and a polycrystalline diamond layer 2 . The design diameter of the polycrystalline diamond compact is 16mm, the thickness is 8mm, and the included angle γ formed by the polycrystalline diamond layer 2 and the bus bar of the polycrystalline diamond compact 4 is 80°; the above-mentioned polycrystalline diamond compact is applied to the PDC drill bit ,use Figure 6 The way to weld the composite sheet.

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Abstract

The invention provides a polycrystalline diamond composite sheet and an application thereof. The polycrystalline diamond composite sheet includes a polycrystalline diamond layer and a hard alloy layer, and the plane of the polycrystalline diamond layer forms an included angle of 20°-88° with the bus bar of the polycrystalline diamond compact sheet. The present invention also provides the application of the above-mentioned polycrystalline diamond compact in a PDC drill bit. The polycrystalline diamond composite sheet of the present invention can arbitrarily change the cutting angle of the polycrystalline diamond composite sheet under the condition of maintaining the optimum back angle, so as to achieve more efficient cutting efficiency or higher durability. When the polycrystalline diamond composite sheet is used in the PDC drill bit, the drilling speed can be increased. At the same time, the polycrystalline diamond composite sheet has regular shape, is easy to weld, and has reliable strength; it can also simplify the manufacturing process of the PDC drill bit.

Description

technical field [0001] The invention relates to a polycrystalline diamond composite sheet and an application thereof, belonging to the field of superhard materials, in particular to a polycrystalline diamond composite sheet that can realize positive cutting angles and is widely used in petroleum, geological and other fields. Background technique [0002] Polycrystalline Diamond Compacts (Polycrystalline Diamond Compacts) is a superhard composite material composed of a polycrystalline diamond layer and a cemented carbide layer. Because of its extremely high wear resistance of diamond polycrystalline layer and impact toughness of cemented carbide, it is widely used in geology and oil drilling. [0003] When the polycrystalline diamond composite sheet cuts an object, the plane passing through a specified point on the cutting edge and perpendicular to the direction of the cutting speed is called the base plane, passing through a specified point on the cutting edge, tangent to an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/56E21B10/46
Inventor 王镇全张伟张凯刘晗琪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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