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Format DR 24

Formost Dual Rotary DR Drill

It is with great pleasure that we introduce for the first time in Jamaica and the Caribbean the Foremost Dual Rotary DR24. Better productivity through better technology; find out how Jamaica Wells & Services Ltd. can be of service to you.

The cable tool (Percussion) method of drilling holes has been used successfully for overburden and hard rock drilling for centuries. In 1948, Wendell Reich (USA) revolutionized the well drilling industry with the development of a top drive rotary rig with hydraulic pull-down capabilities. The next major advancement in drilling productivity came with the introduction of the down-hole hammer. These two events contributed significantly to the state of hard rock drilling, as we know it today.

Drilling holes in overburden and unconsolidated formations, due to unpredictable variations, continues to present drillers worldwide with challenges such as loss of circulation, boulders, unstable walls, crooked holes, aquifer contamination and heaving sands. While a variety of overburden drilling methods exists, historically none has been consistently able to overcome all these challenges. Barber Industries, in conjunction with Wendell Reich, conceptualized and built a rig that could simultaneously drill a hole and set casing under the most difficult of drilling conditions and subsequently introduced the first Dual Rotary drill rig.

Since its introduction on the global market, the Dual Rotary drilling method has gained worldwide acceptance as a cost-effective drilling technique. It has proven to be a viable alternative to more conventional methods when drilling in stable and unstable formations. Its flexibility and versatility continues to deliver economic advantages to drilling construction.

Depth Ranges with Dual Rotary Method

Casing Diameter Depth Range

Penetration Rates

The table below compares penetration rates using a variety of drilling methods.

(1) Drilling speed shown represents aerage time required to drill and install 20 feet over a 100-foot well depth.
(2) Rig type dependent.

Benefits of Dual Rotary Drilling

Boulders
The carbide-studded casing shoe enables the casing to be rotated through boulders without the need for under-reaming or blasting. As casing deflection is minimized, the hole remains plumb.

Heaving Formations
Where heaving ground conditions are experienced, the bit can be retracted into the casing creating and "plug" in the casing, which allows drilling to proceed under controlled conditions in most situations.

Installing and Welding Casing
The operation of installing and welding lengths of casing together is simplified with the Dual Rotary rig. The tilting top drive allows drill pipe and casing to be added and secured to the discharge swivel with the operator standing safely at ground level.

Setting Screens
The lower drive is equally effective at extracting casing, simplifying the process of setting and exposing screens.

Sampling
The Dual Rotary drilling method, employed in conjunction with a cyclone collection system, ensures an accurate sample of the formation being drilled. When the casing is advanced simultaneously with the drill bit, the cuttings that return to the cyclone do not mix with material from the borehole wall and are therefore representative of the substance at the bit face.

Types of Applications

Dual Rotary Applications
Waterwell Applications

• Domestic Waterwell
  
• Municipal and Agricultural Waterwell
  
• Well Abandonment and Casing Recovery

Construction Applications

• General Building Foundation Construction
  
• Hydraulic Elevator Shaft Drilling
  
• Dock/Wharf Construction
  
• Bridge Supports
  
• Land Reclamation Projects
  
• Dam Construction and Rehabilitation
  
• Drilling In Populated Urban Areas

Environmental Applications

• Environmental Sampling
  
• Monitoring Wells
  
• Re-Charge Wells
  

For Rental Equipment

• 1,170-cfm at 350-psi Air Compressor
  
• 21 ton, 100 foot boom Crane Truck