Hey guys, the water surface of a phreatic aquifer is at 1atm pressure.water well drilling rig. Above the free water surface can be permeable, low-permeable, or impermeable layers. When drilling in a phreatic aquifer, choose a water well rig by considering the aquifer’s depth, thickness, and lithology:
For shallow, soft-lithology phreatic aquifers, small pan auger drills work. They have a simple structure, driven by manpower or power to rotate and cut soil layers.
If the aquifer is slightly deeper, a direct circulation mud-flushing rotary table drill is suitable. Mud is pressed from the swivel into the hollow drill pipe to carry out cuttings, meeting drilling needs efficiently.
These choices ensure effective well-drilling in phreatic aquifers by matching rig types to geological conditions.