Impregnated diamond and polycrystalline diamond composite drill bit

A technology of impregnated diamond and polycrystalline diamond is applied in the field of impregnated diamond and polycrystalline diamond composite drill bits, which can solve the problems of impact resistance, poor wear resistance, short service life and disadvantage of PDC drill bits, and achieve drilling The effect of good effect, avoiding damage and long service life

Inactive Publication Date: 2020-07-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact resistance and wear resistance of PDC drill bits are poor
Therefore, the PDC bit is prone to failure and has a short service life
This is very unfavorable for drilling operations in hard formations and abrasive formations

Method used

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  • Impregnated diamond and polycrystalline diamond composite drill bit
  • Impregnated diamond and polycrystalline diamond composite drill bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0053] When the formation 200 is relatively hard, the drill bit 100 has 6 fins, ie, 3 first fins and 3 second fins. The diameter of the polycrystalline diamond compact is 13mm. The impregnated diamond cylinder has a diameter of 15 mm and a height of 20 mm. The axis of the cylinder is parallel to the axis of the drill bit 100 . The diameter of the diamond particles in the impregnated diamond cylinder is 2.5-3 mm. An 80% concentration of diamond particles was used. The substrate is made of 30% tungsten carbide powder with a particle size of 80 microns, 30% tungsten carbide powder with a particle size of 325 microns, 25% copper powder, 10% nickel powder and 5% manganese powder. Six water hole channels are arranged at the lower end of the rotating main body 110, which are respectively used for installing three nozzles with a diameter of 13mm and three nozzles with a diameter of 16mm.

[0054] Compared with conventional drill bits, the impregnated diamond cylinders in the drill...

Embodiment 4

[0056] When the formation 200 is relatively abrasive but moderately hard, the drill bit 100 has five fins. The specification of the polycrystalline diamond compact is 16mm. The impregnated diamond cylinder has a diameter of 15 mm and a height of 20 mm. The axis of the cylinder is parallel to the axis of the drill bit 100 . The diameter of the diamond particles in the impregnated diamond cylinder is 2.5-3mm. An 80% concentration of diamond particles was used. The substrate is made of 30% tungsten carbide powder with a particle size of 80 microns, 30% tungsten carbide powder with a particle size of 325 microns, 25% copper powder, 10% nickel powder and 5% manganese powder. . Six water eye channels are arranged at the lower end of the rotating main body 110, which are respectively used to install six nozzles with a diameter of 13 mm to assist rock breaking by means of water jetting.

[0057] Abrasive formations have severe wear on polycrystalline diamond compacts. When the p...

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Abstract

The invention relates to a drill bit. The drill bit comprises a rotation main body. Polycrystalline diamond compacts and impregnated diamond columns are installed at the lower end of the rotation mainbody. Each impregnated diamond column comprises a basic body fixed to the rotation main body, and diamond particles embedded in the basic body. One part of each of at least part of the diamond particles protrudes out from the lower end face of the corresponding basic body. In the drilling process, the polycrystalline diamond compacts and the diamond particles make contact with a stratum and rotate together with the rotation main body. The drill bit is suitable for hard strata and abrasive strata, a drilling effect is good, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a composite drill bit of impregnated diamond and polycrystalline diamond. Background technique [0002] The drill bit is the main tool used to break formation rock during drilling. The drill bit breaks up the formation rock and drills through it to form a wellbore. Whether a wellbore is formed well or not, and the length of drilling time are inseparable from the structure and performance of the drill bit. [0003] At present, polycrystalline diamond compact (PDC) drill bits are often used to drill into formations. This kind of drill bit has strong cutting ability and fast drilling speed, so it is used more and more widely. However, the impact resistance and wear resistance of PDC drill bits are poor. Therefore, the PDC bit is prone to failure and has a short service life. This is very unfavorable for drilling operations in hard formations and abrasive formations. [0004] ...

Claims

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Application Information

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IPC IPC(8): E21B10/54E21B10/60
CPCE21B10/54E21B10/602
Inventor 杨顺辉郑德帅牛成成邹德永赵小祥李梦刚
Owner CHINA PETROLEUM & CHEM CORP
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