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Polycrystalline diamond compact for drilling and rock-breaking tool

A polycrystalline diamond, drilling rock breaking technology, applied in drilling equipment, drill bits, earthwork drilling and other directions, can solve the problems of weakening the PDC teeth's ability to eat into the rock, reducing the effective working pressure on bit, etc., to improve the rock breaking efficiency, The effect of increasing the effective working weight on bit and reducing the pressure bearing area

Inactive Publication Date: 2011-04-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the contact between the PDC tooth side and the rock will reduce the effective working WOB acting on the PDC tooth working plane, thereby weakening the ability of the PDC tooth to penetrate into the rock

Method used

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  • Polycrystalline diamond compact for drilling and rock-breaking tool
  • Polycrystalline diamond compact for drilling and rock-breaking tool
  • Polycrystalline diamond compact for drilling and rock-breaking tool

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Figure 10 It is a specific embodiment of the polycrystalline diamond compact of the present invention, comprising a polycrystalline diamond layer 1 and a cylindrical matrix 2 composited therewith. A groove 3 is provided on the side of the composite sheet substrate 2. The groove 3 is a blind groove closed at both ends. It is composed of a cylindrical groove surface 6 and a transition surface 7 at both ends. axis of the slice. The transition surface 7 is designed as a spherical surface.

Embodiment 2

[0037] Figure 11 It is a specific embodiment of the polycrystalline diamond compact of the present invention, comprising a polycrystalline diamond layer 1 and a cylindrical matrix 2 composited therewith. A groove 3 is provided on the side of the composite sheet substrate 2. The groove 3 is a blind groove closed at both ends. It is composed of a cylindrical groove surface 6 and a transition surface 7 at both ends. axis of the slice. The transition surface 7 is designed as a plane.

Embodiment 3

[0039] Figure 12 It is a specific embodiment of the polycrystalline diamond compact of the present invention, comprising a polycrystalline diamond layer 1 and a cylindrical matrix 2 composited therewith. A groove 3 is provided on the side of the composite sheet substrate 2. The groove 3 is a semi-blind groove with one end closed and the other open. The closed end is located on the side close to the polycrystalline diamond layer 1 of the composite sheet. The groove 3 is composed of a cylindrical surface 6 and a transition curved surface 7 at its closed end, and the generatrix of the cylindrical surface 6 is parallel to the axis of the composite sheet. The transition surface 7 is designed as a spherical surface.

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Abstract

The invention discloses a polycrystalline diamond compact for a drilling and rock-breaking tool, which comprises a polycrystalline diamond layer and a cylindrical base body compounded with the polycrystalline diamond layer, wherein the side surface of the base body of the compact is provided with a groove, the groove consists of a cylindrical surface groove face and transition curve faces at the end parts of the cylindrical surface groove face, and the bus of the cylindrical surface groove face is parallel to the axial lead of the compact. The compact has the advantages that: the groove reduces the contaction chance between the side surface of the compact and rock; and when the compact is worn during cutting the rock, the groove can reduce the pressure-bearing area of the wearing surface at the bottom of the PDC compact and increase the specific pressure on the rock acted by the wearing surface at the bottom of the PDC compact, thus the capability of entering the stratum by the compact is enhanced and the rock-breaking efficiency is improved.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a polycrystalline diamond composite sheet in the technical field of drilling and 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, PDC teeth or PCD drill bits for short. [0003] Such as figure 1 The polycrystalline diamond composite sheet shown is composed of a polycrystalline diamond layer 1 and a substrate 2 (the material of the substrate 2 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, and the bottom surface is usually a plane. The extremely high hardness of the polycrystalline diamond layer 1 makes it have good wear resistance. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46E21B10/52
Inventor 徐进杨迎新朱澄清王世泽王希勇胡大梁裴竹朱化蜀黎昌华朱礼平吴建中林永茂康杰
Owner CHINA PETROLEUM & CHEM CORP
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