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Cold-fixed PDC (polycrystalline diamond compact) bit

A technology of polycrystalline diamond and composite disc drill bits, which is applied to drill bits, drilling equipment, earthwork drilling and production, etc., to achieve the effects of improving work indicators, reducing drilling costs, and simple replacement

Active Publication Date: 2012-09-19
三原石油钻头厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the current brazing-fixed PDC sheet drill bit, adopt non-brazing fixing method for the PDC sheet of the existing steel body and matrix type diamond drill bit and diamond core drill bit to carry out cold fixing, and disclose a kind of cold fixing Polycrystalline diamond compact drill bit

Method used

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  • Cold-fixed PDC (polycrystalline diamond compact) bit
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  • Cold-fixed PDC (polycrystalline diamond compact) bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The upper body of the drill bit (1) and the lower body of the drill bit (2) are fixed together by the electric welding layer (18), and the center of the drill bit is longitudinally opened with a main water hole (3), and the lower part of the main water hole (3) is connected to 8 water diversions hole (6), each water diversion hole (6) is equipped with a water nozzle (4) and a nozzle sealing ring (5), and three long blades (10) and three A short blade (11), a cylindrical polycrystalline diamond (7) and a diameter-gauge PDC sheet (8) fixed by interference cold pressing are fixed at the gages of the long blade (10) and the short blade (11), the long The cutter wing (10) and the cutting teeth (9) on the short cutter wing (11) use the retaining ring (14) to fix the PDC piece (8) with the PDC piece groove (17) to the drill bit column (12) inside the hole.

Embodiment 2

[0016] Embodiment 2: The upper body of the drill bit (1) and the lower body of the drill bit (2) are fixed together by the electric welding layer (18), and the center of the drill bit is longitudinally opened with a main water hole (3), and the lower part of the main water hole (3) is connected to 10 water diversions hole (6), each water diversion hole (6) is equipped with a water nozzle (4) and a nozzle sealing ring (5), and four long blades (10) and The four short blades (11), the long blades (10) and the short blades (11) are fixed with a rectangular polycrystalline diamond (7) and a gauge PDC sheet (8) fixed by interference cold pressing. The cutting teeth (9) on the blade (10) and the short blade (11) use the stopper pin (15) to fix the PDC sheet (13) with the PDC sheet groove (17) in the hole of the tooth post (12) Inside.

Embodiment 3

[0017] Embodiment 3: The upper body of the drill bit (1) and the lower body of the drill bit (2) are fixed together by an electric welding layer (18), and the center of the drill bit is longitudinally opened with a main water hole (3), and the lower part of the main water hole (3) is connected to 6 water diversions hole (6), each water diversion hole (6) is equipped with a nozzle (4) and a nozzle sealing ring (5), and three long blades (10) and two short blades are distributed on the lower end surface of the lower body of the drill bit (2). Wing (11), long blade (10) and short blade (11) have polycrystalline diamond (7) and a gauge PDC sheet (8) fixed by interference cold pressure, long blade (10) With the cutting teeth (9) on the short knife wing (11), the PDC sheet (13) is fitted in the hole of the tooth post (12) with clearance, and the baffle plate (16) is spot-welded and fixed on the end face of the tooth post (12).

[0018] The foregoing embodiments are applicable to all...

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Abstract

The invention discloses a cold-fixed PDC (polycrystalline diamond compact) bit. PDCs with slots are in clearance fit with and fixed in tooth post holes by check rings or stop pins to form cutting teeth, so that the heat influence on the PDCs by the braze welding is avoided, and simple maintenance and replacement of onsite PDCs are realized; when rock is broken in a well, the counter force of the rock drives circumferential conversion working surfaces of the PDCs in the composite tooth posts to rotate, as a result, the defect of abrasion of fixed working surfaces of the PDC bit is overcome, cutting edges are kept sharp during the whole cutting processing, the application stratum scope of the PDC bit is also widened, at the same time, the heat damage on the PDCs during the manufacture process of the bit can be avoided, and the abrasion resistance and the thermal stability of the product are improved. The abrasion resistance of the cutting edges is 13.5 times of that of the standard cutting edge, the whole service life of the bit can be prolonged for 3 to 5 times, and the demand of continuous development in the drilling field is satisfied.

Description

technical field [0001] The invention relates to a polycrystalline diamond composite drill bit, in particular to a cold-fixed polycrystalline diamond composite drill bit, which belongs to the field of drilling tools. Background technique [0002] Polycrystalline diamond compact bit is a kind of diamond bit. Polycrystalline diamond compact bit is abbreviated as PDC, also called PDC bit. Polycrystalline diamond bit is also called PDC bit. It is widely used in geological exploration, coal field drilling, In exploration and other fields, the currently used polycrystalline diamond compact drill bits adopt the process of brazing and fixing the PDC sheet. The PDC sheet is brazed on the working surface of each blade of the drill body with silver-based solder with a melting point not higher than 700 degrees Celsius. The PDC sheet is embedded in the tooth hole for fixing, because the PDC sheet is very sensitive to temperature, the wear speed is significantly accelerated at around 350°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46E21B10/61E21B10/43
Inventor 刘新军
Owner 三原石油钻头厂
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