Borewell contractors usually choose between DTH (down-the-hole) drilling and rotary drilling. Both can drill water wells, but they work differently.
How DTH drilling works
A pneumatic hammer sits at the bottom of the drill string and strikes the rock while the string rotates. Compressed air drives the hammer and carries the cuttings out of the hole. It drills hard rock quickly.
How rotary drilling works
A rotating bit cuts the ground while drilling fluid or air carries the cuttings up. It is often used in softer formations.
Which one should you choose?
- Mostly hard rock: DTH is usually the faster choice.
- Mostly soft or sedimentary ground: rotary may suit better.
- Mixed ground: a DTH-cum-rotary rig can handle both, so ask about combination rigs.
Think about the whole job
Check your typical depth, hole diameter, water or air supply, and how often you move between sites. Then match the rig and carrier to that work.
If you are not sure, talk to us. We build DTH drilling rigs in Bhilwara and can suggest a setup for your ground conditions.
