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| Air rotary drilling, the ideal method
for
advancing boreholes into consolidated bedrock formations, uses a
rotary-driven drill bit and high-pressure, high-flow air.
Typically, either a "tricone" cutting bit or a downhole
percussion hammer is used to penetrate the rock surface and grind the
rock into small particles. High-flow air is injected through
the
drill string, cooling the bit, evacuating rock cuttings from the
borehole and stabilizing the borehole during drilling. The air-rotary technique is much more efficient than other rock drilling techniques (ie: cable tool) because the high-flow air constantly cleans the bottom of the boreholes, which allows for consistent contact between the drill bit and intact bedrock. The size of the air compressor and boreholes determine the achievable depth, since the compressor must maintain an up hole velocity of approximately 3,000 feet per minute to effectively remove the drill cuttings. In bedrock formations where cuttings removal is more difficult, foam can be added to the injected air to increase the viscosity and help lift cuttings from the bore. Uni-Tech's ReichDrill 650 air drill is a strong, versatile drill capable of over 1,000 foot depths and large-diameter boreholes. Additionally, our mast-mounted rod carousel, powered breakout wrenches and auxiliary mud-rotary capabilities for surface casing installation make the ReichDrill 650 the powerful and efficient tool you need for your air drilling projects. |