The DR-24HD is meticulously designed for demanding applications, incorporating a durable lower drive that delivers two and a half times the torque of the standard DR-24. It features a reinforced mast and larger hoist cylinders, significantly enhancing pullback capabilities. Particularly suited for large-diameter operations such as municipal well projects and mine dewatering, the DR-24HD epitomizes the advancements made by Foremost, which has persistently improved the DR series since acquiring the Dual Rotary technology from Barber Industries in 1993. Today, various DR models provide enhanced safety, productivity, and profitability across multiple drilling endeavors.
Drilling type – Dual Rotary
Applications – Well
Mobility – Truck-Mounted
Drilling Unit – Double Rotary Head
Other Characteristics – Hydraulic
Drilling Diameter – Max.: 1,016 mm (40 in) Min.: 152 mm (6 in)
Drilling depth – 400 m (1312’04” )
The optional cyclone sample collecting system slows discharge velocity to allow accurate and continuous sampling of the formation.
All drill cuttings rise to the surface between the drill pipe and casing and exit through the discharge swivel attached to the top of the casing. The discharge swivel directs cuttings to a safe dumping point or to an optional cyclone collection system.
The independent hydraulic top drive tilts for convenient loading of drill pipe and casing with the operator standing at ground level.
A carbide-studded casing shoe is welded to the casing bottom. The shoe I.D. is flush with the casing I.D. so that there is no reduction in the bore hole diameter when switching to open-hole drilling.
Rotation and feed forces are effectively transmitted from the lower drive to the casing via a set of three carbide inserts. Casing jaws are available for all common casing sizes and can be changed out quickly in the field.
The lower rotary drive is also used as a powerful breakout and spinner for drill pipe, hammers, bits, and thread casing.
Dual Rotary drills feature a distinctive lower rotary drive that effectively advances steel casing through overburden materials such as sand and gravel. High-strength steel jaws equipped with carbide inserts efficiently transmit pullback, pulldown, and rotational forces to the casing.
An independent rotary top-drive effectively manages a drill string equipped with either a down-the-hole hammer or bit. While air is typically utilized to evacuate cuttings, Foremost DR-drills also possess the capability to employ pumps for mud or reverse circulation drilling.
The top and lower drives function independently, enabling the bit position to be adjusted relative to the casing. Upon reaching the desired depth, the DR seamlessly transitions to open-hole drilling without the necessity of tool changes.
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