How to choose the right rig specification for a water well project

Start with the target depth and final casing diameter, then add a 20–30% depth margin to the rig rating.

Formation determines method: mud rotary for unconsolidated sediments, air DTH for hard rock, and dual-capability rigs for mixed geology.

Finally, consider mobility. Truck-mounted rigs suit road-accessible sites; crawler rigs suit soft or steep ground.