Hot pressed and diamond impregnated drill tooth applicable to strong abrasive hard formation

A technology for impregnating diamonds and diamonds, applied in the field of hot-pressing-impregnated diamond drill teeth, can solve the problems of lower hardness and wear resistance than hot-pressing sintering, insignificant effect of strong abrasive formations, uneven distribution of diamonds, etc. Avoid premature shedding, reasonable self-sharpening performance, and improve the effect of bonding strength

Inactive Publication Date: 2011-08-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The way to improve the performance of this type of drill bit is to reasonably design the diamond parameters. There is a set of reasonable diamond parameters corresponding to the formations with different characteristics. For example, when drilling into hard and abrasive formations, it is required to use magnetic separation, high-grade, fine-grained and High-concentration diamond, the specific parameters are calculated by theory to ensure the efficient rock breaking and long life of the drill bit, but there is a significant problem in this method: natural diamond is expensive, and the cost of the drill bit is too high. In order to reduce the manufacturing cost, most of them use Artificial diamond, which can achieve a certain effect in the drilling of general hard formations, but if the formation is highly abrasive, artificial diamond is not enough to resist the abrasiveness of the rock, and the distribution of diamond in the matrix is ​​uneven, resulting in the drill bit Severe early wear and t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Synthesize drill teeth by hot pressing method, the drill tooth specification is φ13×15mm, adopt the vertical and horizontal inlay method alternately, process φ101.6 hot press impregnated diamond drill bits, and drill siliceous cemented quartz with a drillability of 9.2 sandstone.

[0012] Carcass material (mass percentage, 200 mesh to 400 mesh): p 2%, Mn 1%, Co 17.5%, Cu 15.4%, Ni 15.4%, cast tungsten carbide 20.5%, WC 27.6%, artificial single crystal diamond powder 0.7 %; the diamond concentration is 100% (volume concentration), and the diamond particle size is 70 mesh to 80 mesh.

[0013] Sintering process parameters: sintering pressure 22MPa, sintering temperature 1060°C, heat preservation 4min;

[0014] Drilling parameters: WOB 1.5t, speed 106rpm, pump volume 11L / s.

[0015] The drilling speed of this diamond drill bit is 1.38m / h, and the average wear rate is only 0.014g / m.

Embodiment 2

[0017] Synthesize the drill teeth by hot pressing method, the drill tooth specification is φ19×15mm, adopt the vertical and horizontal inlay method alternately, process the φ101.6 hot press impregnated diamond drill bits, and drill the siliceous cemented quartz with a drillability of 7.3 sandstone.

[0018] Carcass material (mass percentage, 200 mesh to 400 mesh): p 1.5%, Mn 3%, Co 14.5%, Ni 12.7%, Cu 20%, cast tungsten carbide 22.6%, WC 25%, artificial single crystal diamond powder 0.7 %; the diamond concentration is 80% (volume concentration), and the diamond particle size is 60 mesh to 70 mesh.

[0019] Sintering process parameters: sintering pressure 22MPa, sintering temperature 1060°C, heat preservation 4min;

[0020] Drilling parameters: WOB 1.5t, speed 106rpm, pump volume 11L / s.

[0021] The drilling speed of this diamond drill bit is 2.13m / h, and the average wear rate is only 0.019g / m.

Embodiment 3

[0023] Synthesize the drill teeth by hot pressing method, the drill teeth size is φ9×10mm, adopt the vertical and horizontal inlay method alternately, process the φ101.6 hot-pressed diamond drill bits, and drill the siliceous cemented quartz with a drillability of 9.7 sandstone.

[0024] Carcass material (mass percentage, 200 mesh to 400 mesh): p 1.9%, Mn 1%, Ni 12%, Co 13.9%, Cu 17%, cast tungsten carbide 21%, WC 32.5%, artificial single crystal diamond powder 0.7 %; diamond concentration 110% (volume concentration), diamond particle size is 70 ~ 80 mesh.

[0025] Sintering process parameters: sintering pressure 22MPa, sintering temperature 1060°C, heat preservation 4min;

[0026] Drilling parameters: WOB 1.5t, speed 106rpm, pump volume 11L / s.

[0027] The drilling speed of this diamond drill bit is 1.35m / h, and the average wear rate is only 0.012g / m.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] (1) Hot-pressed diamond...

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Abstract

The invention provides a hot pressed and diamond impregnated drill tooth applicable to a strong abrasive hard formation, which consists of a composite matrix and a natural diamond and is composed by a hot pressing and sintering process, wherein the composite matrix consists of 25-43% of WC (wolfram carbide), 15-25% of casting WC, 15-30% of Cu, 13-20% of Co, 11-17% of Ni, 1-3% of Mn, 1-2% of P and 0.5-1% of artificial single-crystal diamond powder; the natural diamond is a titanium coated natural diamond, the particle size range is 40-100 meshes, and the concentration is 75-110%; and the drill tooth is cylindrical. The drill tooth provided by the invention can be inlaid on a bit matrix in the vertical and horizontal ways and has cutting and grinding combined functions for rock breaking in the soft and hard interlaced and abrasive formation, high rock breaking efficiency and long service life.

Description

technical field [0001] The invention relates to a rock-breaking tool for oil drilling, in particular to a hot-press impregnated diamond drill tooth for a diamond drill bit. Background technique [0002] With the continuous improvement of exploration level, shallow and easy-to-develop oil and gas resources have gradually decreased, and it is imperative to develop oil and gas resources in deep formations. The drilling of deep and ultra-deep wells often encounters sandstone, granite and other strong abrasive hard formations. In the past, roller cone bits, PDC bits and diamond bits were often used in drilling such formations. However, the rock-breaking efficiency of the roller cone bit is low, the footage of a single bit is small, and it is prone to downhole accidents such as the loss of the cone; the PDC bit wears fast and is difficult to eat; the diamond bit also has the problems of slow drilling speed and short life. , seriously restricting the speed of oil and gas explorati...

Claims

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Application Information

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IPC IPC(8): E21B10/46C22C29/08B22F3/12C22C32/00
Inventor 邹德永庄林林袁军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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