Dual Rotary

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R-51, R-54 Foremost Dual Rotary

Earth Drilling’s Foremost manufactured Dual Rotary, DR-24, will set up to 24 inch diameter casing. The drill rig is mounted on a Kenworth T-800 tridem axle unit, eliminating road ban restrictions.

This model is commonly used for domestic and municipal wells, and construction applications, such as foundation piling projects and holes for hydraulic elevator jacks. Earth Drilling also utilizes this rig for overburden drilling and casing setting, instrumentation installation around tailing ponds and unconsolidated formations, and specialized hybrid dual rotary drilling. 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. Earth Drilling’s DR-24 Heavy Duty (HD) is equipped with a 900 cfm / 350 psi air compressor, enabling large diameter drilling up to 300 feet deep. The drill rig can also be used to auger drill, split-spoon sample, mud rotary drill, and reverse circulation (RC) drill.

Rig Dimensions

  • Weight: 30,300 kg 66,800 lbs
  • Height: 4.05 m 13 ft 4 in
  • Tower Height: 12.5 m ext 21.5 m 41 ft ext 71 ft 1 in
  • Length: 12.81 m 42 ft 1 in
  • Width: 2.6 m 8 ft 6 in

Specifications

  • Drives: 23,000 kg
  • Steer: 7,300 kg
  • Ground Pressure: 23.37 lbs / sq in
  • Top Drive Stroke: 26 ft
  • Top Drive Hoist Capacity - Pullback: 60,000 lbs
  • Top Drive Hoist Capacity - Pulldown: 10,000 lbs
  • Top Drive Torque: 10,000 ft lbs
  • Lower Drive Stroke: 12 ft
  • Lower Drive Hoist Capacity - Pullback: 75,000 lbs
  • Lower Drive Hoist Capacity - Pulldown: 33,000 lbs
  • Lower Drive Torque: 80,000 ft lbs
  • Lower Drive Air Compressor : 900 cfm / 350 psi

Benefits

  • Top and lower drives feed independently, meaning that the bit position can vary relative to the bottom of the casing
  • No need to trip out or change tools when transitioning to open-hole drilling
  • Drill rig can also be used to auger drill, split-spoon sample, mud rotary drill and reverse circulation (RC) drill

Customized Features

  • Ti-Axle
  • Lower Drive Torque (HD Motor): 140,000 ft lbs
  • Unique Lower Rotary Drive
  • Independent Rotary Top

Drilling Equipment