... drilling rig 1 gained 3 national practical new-type patents invention 2 drilling depth: 30-200m water well drilling rig ... pipe diameter50mmDrilling angle90°~75°Drilling weight(no include power) ... exploration,Earth physics exploration,sampling test in mining, water Well,.Geothermal .Blast opening etc drilling engineering New Arrival RHF 200 hydraulic type core water well drilling rig for ...