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With the air lifting drilling process the borehole cuttings are conveyed out via the hollow stem of the drill pipe.
The drilling system must be equipped with a compressor.
Compressed air is blown in below the water level of the bored hole to produce an upward flow movement which transports the mixture of drilling fluid and borehole cuttings to the surface. The borehole column is cleaned in the process.
The necessary compressed air can be provided in three ways:
Unlike the direct flushing process, in this process the drilling fluid flows in the opposite direction. Clear water is used for flushing andcan be mixed with rinsing additives to prevent possible cave material from forming. The process is used:
Achievable final depths down to 1000 m depend on the size of the drilling rod and the compressor capacity.