Drilling tool set with back washing (AIRLIFT)

Drilling tool set with back washing (AIRLIFT)

Drilling technology with backwash (reverse circulation, AIRLIFT) is designed for the construction of industrial water wells with a diameter of up to 1 meter. 

This technology is used in drilling rigs LBU-50-30, UGB. 

The well is washed by water, which is supplied to the bottom hole between the well walls and drill pipes. The drilled rock and water in the form of pulp rise from the bottom up the drill pipes and through the swivel and rubber hose get into the sump, where they are cleaned of sludge. From the sump (sump), the water flows into the well by gravity, it is washed by the bit and, mixed with the drilled rock, is absorbed through the bit and drill pipes with the help of an airlift. The walls of the well "hold" the hydro static pressure of water coming from the sump. A prerequisite is that the water level in the well is maintained 3 to 4 meters above the static level aquifer 

When drilling water wells with backwash, suction of the pulp through the bit into the drill pipe is carried out in the following way: 

The pulp is absorbed by the airlift. Compressed air is supplied from the compressor to the swivel, and then through the air pipes - into the well. Air, mixing with water and drilled rock, forms an aerated pulp that rises up the drill pipes and enters the sump.