CIR DTH Drill Bits

Select Based on Rock Type

· Hard Rock

Choose a drill bit with a high-strength skirt body and spherical drill bits. The number of flushing grooves should be limited (typically a two-wing bit), and their size should not be too large to optimize efficiency. It is better to choose the spherical button for the carbide buttons, and the exposed height of the spherical button should not be too large.

· Soft Rock

Opt for a drill bit with enhanced cuttings removal capability, such as a three-wing or four-wing bit. The flushing grooves can be larger and deeper to facilitate debris removal. Inserts should be ballistic or wedge-shaped, with a higher profile for improved penetration.

· Fractured or Jointed Zones

To minimize deviation, use a concave or convex bit face for better guidance and stability.

· Clay-Rich Formations

The middle slag discharge hole is often blocked, it is best to use the side slag discharge bit.

Consider Hole Diameter and Depth

· Drill Bit Size Compatibility

Ensure the drill bit size matches the DTH hammer and drill pipe dimensions. The maximum drill bit diameter is one inch larger than the hammer size.

· Depth Considerations

Larger hole diameters require larger drill bits. The deeper the drilling depth, the higher the requirements for wear resistance and stability of the drill bit.

Evaluate Drilling Speed and Cuttings Removal

· Drilling Speed

The penetration rate depends on the drill bit type, rock hardness, and operational parameters. Choose a drill bit that can achieve the desired drilling speed under the given conditions.

· Cuttings Removal Efficiency

A crucial factor in drill bit performance, efficient cuttings removal reduces resistance and increases penetration speed. We pay attention to the flushing groove design and how effectively it clears debris.

Consider Cost-Effectiveness

· Long-Term Cost Savings

Beyond the initial purchase price, consider the maintenance and replacement costs. Durable drill bits reduce the frequency of replacements, ultimately lowering operational costs over time.

· Reputable Manufacturers

Choosing a trusted brand with quality service minimizes risks and improves value for money.

Other Key Factors

· Rotational Speed & Torque

These parameters should match the drilling rig’s specifications to ensure optimal performance.

· Material & Manufacturing Quality

The drill bit’s material composition and production process directly affect performance and lifespan. These parameters should be determined based on the specific rock drilling equipment and process requirements.