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Rock breaking mechanism of diamond bit

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Time of issue:2020-12-14
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(Summary description)The rock breaking effect of the diamond bit is done by diamond particles.

Rock breaking mechanism of diamond bit

(Summary description)The rock breaking effect of the diamond bit is done by diamond particles.

Categories:company news
Author:
Origin:
Time of issue:2020-12-14
Views:0

Information

The rock breaking effect of the diamond bit is done by diamond particles. To know the rock breaking effect of a drill bit, it is necessary to understand the rock breaking effect of single diamond. In hard formations, single diamonds put the rock under high stress (about 4200-5700MPa, some data think it can reach 6300MPa) under the action of weight-on-bit, causing the rock to undergo lithological transformation from brittleness to plasticity. A single diamond is eaten into the formation, and the rock is cut under the action of torque. The cutting depth is basically equal to the penetration depth of the diamond particles. This process is like "ploughing the ground" so it is called the plough cutting action of the diamond bit.　

In some brittle rocks (such as sandstone, limestone, etc.), the volume of the broken rock is much larger than the volume of the diamond particles in the diamond particles under the simultaneous action of the drilling pressure and torque. When the pressure is not high, small grooves can only be formed along the direction of diamond movement. Increasing the pressure will break the deep part of the small grooves and the rocks on both sides, exceeding the cross-sectional size of the diamond particles. The rock breaking effect of a diamond bit is related to lithology and external factors that affect lithology (such as pressure, temperature, formation fluid properties, etc.), the weight on bit is an important factor. Like the roller cone bit, it has three methods of surface breaking, fatigue breaking and volume breaking when breaking the rock. Only when the diamond particles have enough specific pressure to eat into the stratum rock and cause the rock to break in volume, can the ideal rock breaking effect be achieved.

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