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Diamond cutter

A diamond drill and polycrystalline diamond technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of increasing the cost of diamond drill teeth, difficult to remove, etc., and achieve the effects of high hardness, effective grinding and prolonging service life

Inactive Publication Date: 2017-05-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because the binder is scattered and distributed at the diamond grain boundary, on the one hand it is difficult to remove completely, on the other hand, even the work of partially removing the binder will greatly increase the cost of the diamond drill

Method used

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Experimental program
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Effect test

Embodiment 1

[0020] Such as image 3 , 4 as shown, image 3 The diamond drill teeth shown are integrally machined from polycrystalline diamond 1, Figure 4 The diamond drill tooth shown is composed of polycrystalline diamond layer 1 and WC cemented carbide layer 2 sintered and compounded under high temperature and high pressure conditions of 5-10GPa and 1300-1500°C. Polycrystalline diamond 1 is made of graphite at 18-20GPa , under the condition of 1700 ~ 2000 ℃, it is directly transformed into diamond and sintered and compounded. The polycrystalline diamond working layer of these two kinds of drill teeth contains less than 1wt% of non-bonding non-carbon components, and the drill teeth are cylindrical as a whole. Flat top teeth, the top diamond part is the working layer. The Vickers hardness of the diamond part of these two kinds of drill teeth is above 100GPa, and its service life in oil and gas drilling is more than double that of polycrystalline diamond drill teeth (PDC) obtained by ...

Embodiment 2

[0022] Such as Figure 5 The diamond drill teeth shown are composed of polycrystalline diamond layer 1 and WC cemented carbide layer 2 through microwave welding. The polycrystalline diamond working layer 1 of this kind of drill tooth contains less than 1wt% of non-bonding non-carbon components. The overall drill tooth is cylindrical, and the working surface of the polycrystalline diamond layer 1 on it is the Great Wall Concave-convex surface. The Vickers hardness of the diamond part of this drill tooth is above 100GPa, and its service life in oil and gas drilling is more than 1.5 times longer than that of the polycrystalline diamond drill tooth (PDC) obtained by adding a binder in the synthesis process. Drilling into the underground rock formation can reach more than 2550 meters.

Embodiment 3

[0024] Such as Image 6 The diamond drill tooth shown is composed of polycrystalline diamond layer 1 and WC cemented carbide layer 2 by laser welding. The polycrystalline diamond working layer 1 of this kind of drill tooth contains less than 1wt% of non-bonding non-carbon components. The overall drill tooth is cylindrical, and the working surface of the polycrystalline diamond layer 1 on it is an arc. shape. The service life of this drill tooth in oil and gas drilling is more than 1.5 times longer than that of the polycrystalline diamond drill tooth (PDC) obtained by adding a binder in the synthesis process, and it can drill more than 2,600 meters into the underground rock formation at one time.

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Abstract

The invention provides a diamond cutter to overcome the defect of an existing polycrystalline diamond cutter (PDC) when being used in oil-gas drilling. The diamond cutter is machined by a polycrystalline diamond whole or machined after a polycrystalline diamond is recombined with a base body part in a connected mode, and the amorphous carbon component contained in a working layer of the polycrystalline diamond is smaller than 1wt% of the total mass of the working layer of the polycrystalline diamond; and the polycrystalline diamond adopts high-purity carbons to serve as raw materials and is compounded through sintering under the high-temperature and high-pressure condition, the ranges of the high-temperature and high-pressure condition are 8-25GPa and 1200-3000DEG C correspondingly, and the optimized sintering temperature-pressure condition is about 10-18GPa and 1500-2500DEG C correspondingly. Compared with a traditional PDC obtained by adding an adherent in the traditional compounding process, the polycrystalline diamond cutter provided by the invention has higher hardness, abrasive resistance, heat stability and impact resistance, compared with the service life of the traditional PDC, the service life in oil-gas drilling is prolonged by 1.0-3.0 times, and 2500 meters or more is achieved during drilling into an underground rock stratum at a time.

Description

technical field [0001] The invention belongs to the technical field of drilling tools for complex rock formations and high hardness rock formations, in particular to diamond drill teeth for oil and gas exploration and mining. Background technique [0002] Polycrystalline Diamond Cutter (PDC) is a key working part of oil and gas geological drilling. Oil and gas drill bits usually use PDC to cut and scrape rocks. Therefore, the wear resistance, thermal stability and Performance such as impact resistance is a key factor that affects drilling efficiency, cost, and safety. Especially in deep well drilling above 2,000 meters, the performance requirements for PDC are more stringent. At present, the development and preparation of high-performance PDC for oil and gas drilling has become a high-tech system engineering, and related technologies have also become one of the core technologies of oil and gas geological drilling. [0003] PDC is generally composed of a polycrystalline diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/56
CPCE21B10/56
Inventor 贺端威
Owner SICHUAN UNIV