2.CN 37 – CN 44 Series Soft Formation Rotary Drill Bits
Design features: Large diameter and widely spaced chisel or sharp conical carbide inserts with high projection. Small flat inserts placed in between, on gage and inner rows to prevent cone shell erosion. Hard faced cone shell to delay erosion and exposure of active inserts.
Benefits: High penetration rates in soft formation along with vibration free drilling.
Applications: Suitable for Shale, Lime stone, Sandstone, Gravel – Soft formations with compressive strengths of 50 to 110 Mpa.