Requirements for cemented carbide in coal field geological exploration

Using carbide cutting tools welded on the drill bit body as a tool to break rocks, this drilling method is what we call carbide drilling. In coal field geological exploration, cemented carbide is the preferred tool material. In China’s coalfield geological drilling, cemented carbide drilling accounts for about 80% of the total project volume. What issues should we pay attention to during drilling? What are the requirements for cemented carbide in coalfield geological exploration?

Carbide button, coal exploration

1. Understand the nature of the rock formation and choose the drill bit type scientifically and rationally

 

Carbide drill bits are suitable for drilling in soft and medium-hard rock formations but are not suitable for drilling into hard rock formations above grade 8. During the drilling process, efficient drill bits and optimal drilling procedures must be scientifically and reasonably selected based on the rock properties.

When drilling the first type of soft rock, cemented carbide makes it easy to break the rock, the rock is less abrasive, and the drilling efficiency is higher. However, more rock powder is produced in the hole, and the rock powder particles are larger, and the hole wall will appear. Collapse easily.

Carbide has a certain degree of abrasiveness when drilling into the second type of rock, and the key problems to be solved when drilling are roughly the same as those in the first type. Therefore, when drilling into argillaceous rocks, a rib-type drill bit with a large cutting depth or a large cutting edge should be used.

When cemented carbide is used to drill into the third type of rock, the drilling efficiency is low. Choose from various stepped crushing drill bits or various small cutting tool drill bits.

When cemented carbide is used to drill into the fourth type of rock, it is characterized by hard rock and high abrasiveness, so the alloy wear must be serious and the drilling efficiency must be low. The key problem to be solved during drilling is to increase the drilling efficiency while extending the life of the drill bit. If the rock is uneven, attention should also be paid to the chipping problem of the alloy.

 

2. Strictly abide by operating procedures when drilling

 

Before we drill with carbide, we must strictly check the quality of the drill bit’s welding. Carefully arrange the drill bits in groups and rotate them for grinding to ensure consistent hole diameters.

Be sure to keep the bottom of the hole clean. When a new drill bit is lowered into the hole and starts drilling, light pressure, slow rotation, large pump volume, and slow sweeping of the hole to the bottom should be used to prevent alloy chipping and core clogging from affecting the drilling efficiency of the entire round.

During the drilling process, if you encounter rock formations that are difficult to extract, such as cores that are easily washed away or worn, the length of the passes must be reasonably controlled to ensure the core recovery rate.

 

3. It is necessary to reasonably control the time when the cemented carbide drill bit returns to the footage.

 

When drilling with artificially sharpened alloy drill bits, the cutting tools are gradually blunted as the drilling time increases, so the mechanical penetration rate decreases as the drilling time increases. Scientifically and reasonably grasp the time of each drilling session to achieve the optimal drilling speed.

The advantages of cemented carbide such as high hardness, strong corrosion resistance, high wear resistance, and stable chemical properties make it easier to cope with the harsh coal field geological exploration environment. LMM has been engaged in cemented carbide production for more than 15 years and provides various key drilling components for coalfield geological exploration. Welcome to consult

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