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DUAL ROTARY DRILLS MOBILE EQUIPMENT

DUAL ROTARY Foremost Dual Rotary (DR) drills have been working successfully around the world since 1979. Over the years, the DR method has earned an enviable reputation for exceptional drilling performance in unconsolidated overburden. DR operators regularly drill and case through hundreds of feet of tough overburden where casing hammers and under-reamers have been unsuccessful. The Foremost DR also delivers excellent productivity for a variety of open-hole applications; making it one versatile, powerful, and truly unique machine.

TOP TEN REASONS TO CONSIDER A FOREMOST DUAL ROTARY RIG Since 1979, Foremost’s Dual Rotary drills have delivered on the promise of better performance. They continue to make significant contributions to the productivity and profitability of operators worldwide. For a growing number of contractors, there’s simply no better way to drill. Consider these top DR features: Exceptional Overburden Performance: Foremost DR drills have been proven repeatedly in some of the toughest unconsolidated overburden formations, including sand, gravel, glacial till, and boulders. The DR method minimizes the...

BETTER PRODUCTIVITY THROUGH BETTER TECHNOLOGY 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...

Since acquiring the Dual Rotary technology from Barber Industries in 1993, Foremost has continually updated, refined and expanded the DR line with the goal of enhancing its functionality and extending its range of applications. Today, Foremost offers several DR models, each packed with features that deliver heightened safety, productivity, and profitability across a variety of drilling activities. 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...

AVAILABLE MODELS The DR-12 is a light, yet powerful PTO rig popular among domestic water well contractors drilling in moderate to severe overburden. It will handle casing up to 12” (305 mm) in diameter, and has been field tested to depths beyond 550 ft (168 m) for a typical 6” (152 mm) cased well. The DR-12 is available with an optional pipe tub, single pipe loader arm and telescopic casing jib. The configuration accommodates diverse site conditions. The DR-24HD (‘heavy-duty’) features a heavy-duty gear-driven lower drive, which generates two and a half times the torque of the standard...

TOP DRIVE Stroke Hoist Speed Hoist Capacity Torque (stall) Rotation Speed LOWER DRIVE Stroke Hoist Capacity Torque 12 ft (3.66 m) Pullback 42,400 lbs (19200 kg) Pulldown 18,500 lbs (8400 kg) 500,000 in-lbs (56500 Nm) Rotation Speed Max. Casing Diameter COMPRESSOR Air Flow Pressure Engine Power DIMENSIONS Length Height Width Weight JIB BOOM WINCH Wire Rope Length Wire Rope Diameter Line Pull on Bare Drum Line Speed on Full Drum WATER & FOAM INJECTION Capacity Pressure Performance specifications are theoretical maximums. Actual performance may vary. Hydraulic Breakout Hydraulic System Hoist...

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