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Polycrystalline diamond compact

A polycrystalline diamond and composite sheet technology, applied in construction and other directions, can solve the problems of reducing the working life of the drill bit, thermal wear, poor cooling effect of PDC teeth, etc., to improve the cooling effect, enhance the thermal wear resistance, and reduce the weakening effect. Effect

Inactive Publication Date: 2011-05-25
中国石油天然气股份有限公司冀东油田分公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cooling effect of the drilling fluid or other circulating medium on the PDC teeth is not good, thermal wear may occur, which seriously reduces the working life of the drill bit

Method used

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Embodiment Construction

[0061] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0062] The following are examples of the shape and arrangement of the double grooves in the present invention:

[0063] Part of the intersection line between the curved surface of the groove and the outer surface of the PDC composite sheet can be located on the side of the base body, and the other part can be located on the other outer surface of the base body.

[0064] The intersection lines between the curved surface of the groove and the outer surface of the PDC composite sheet can all be located on the side of the base body.

[0065] The inner concave surface of the double groove is a cylindrical surface, and the two grooves are symmetrically arranged on the composite sheet base body along the longitudinal direction, the transverse direction or the oblique direction.

[0066] The inner concave surface of the doub...

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Abstract

The invention discloses a polycrystalline diamond compact (PDC), which belongs to the technical field of drilling tools, particularly rock-breaking tools, for well drilling projects. The polycrystalline diamond compact provided by the invention consists of a polycrystalline diamond layer (1) and a substrate (2) combined with the polycrystalline diamond layer (1), and is characterized in that the side face of the polycrystalline diamond compact has two grooves. The compact has the advantages that: the grooves reduce the opportunities for the side face of the compact to contact with rock, and when the compact is worn in a rock cutting process, reduce the pressure bearing area on the worn face at the bottom of the PDC compact and increase the specific pressure on the rock interacting with the worn face at the bottom of the PDC compact; and thus, the capability of the compact for penetrating into stratum is improved, and the rock-breaking efficiency of a drill bit can be improved. In addition, the grooves increase the radiation area of the side face of the compact, which contributes to the cooling of the compact.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a polycrystalline diamond composite sheet in the technical field of rock-breaking tools. Background technique [0002] Polycrystalline diamond compact is a cutting element used in drilling tools in drilling engineering, especially polycrystalline diamond compact drill bits (ie PDC drill bits) and other rock breaking tools, referred to as composite chips or PDC teeth for short. [0003] The polycrystalline diamond composite sheet is composed of a polycrystalline diamond layer 1 and a matrix 2 (the matrix material is usually cemented carbide). The outer surface of the base body 2 includes a side surface and a bottom surface. The side surface is usually a cylindrical surface, or other surface of revolution such as an elliptical cylinder surface, and the bottom surface is usually a plane. The extremely high hardness of the polycrystalline diamond layer makes it very resistant to wear. At the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/55
Inventor 朱宽亮杨迎新范晓勒马捷何辛周岩王涛裴竹徐小峰
Owner 中国石油天然气股份有限公司冀东油田分公司
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