1.CN 25 – CN 31 Series Very Soft Formation Rotary Drill Bits
Design features: Large diameter and widely spaced chisel
or sharp conical carbide insert with high projection.
Small flat inserts placed in between, on gage and inner rows to prevent cone shell erosion. Laser hard faced spot deposits to arrest steel erosion. Additional flush space on shirttail for quick evacuation of cuttings.
Benefits: Vibration free drilling resulting in maimum penetration rates in very soft formation.
Applications: suitable for Sand, Mudstone, Sandstone type sedimentary formations with low compressive strenghs of 20 to 60 Mpa