... inserts. PDC bit are widely used in coalfields exploration and for open hole drilling. They possess high penetration than ... , sticky formations such as coal, oil shale, tarsands, and shallow oil and gas.PDC bit : 56, 60, 76, 96, 113 ... geotechnical exploration, Mining exploration, Oil exploration and hydrapower station grouting project ( wireline core drilling and double-tube core drilling)1.Drill rod ...