... railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction2. Coal mining exploration, Ore exploration3. Small ... hole diameter water well drilling4. Geothermal pipe-installing for heat pump5. Small-diameter ... engine495D(26.5KW)ElectromotorY180L-4(22KW) water well drilling rig (KDY-300Y 300M depth)