Foremost Dual Rotary drills feature a unique lower rotary drive that is used to advance steel casing through
unconsolidated overburden, such as sand, gravel, glacial till, and boulders. Pullback, pulldown, and rotational
forces are effectively transmitted to the casing via high-strength steel jaws with carbide inserts.
An independent rotary top drive simultaneously handles a drill string equipped with a down-the-hole
hammer, drag bit, or roller cone bit. Cuttings are typically evacuated with air, but Foremost DR drills can also
be configured with pumps for mud or flooded reverse circulation drilling.
The top and lower drives feed independently, meaning that the bit position can vary relative to the bottom
of the casing. Once the desired casing depth has been achieved, the DR continues drilling open-hole like
a conventional top drive drill. With a Foremost DR drill, there is no need to trip out or change tools when
transitioning to open-hole drilling.