Two Drilling Methods, One Truck Almost every well starts in soil, clay or gravel and finishes in rock. Buying two rigs for those two jobs is expensive; the JK930 runs both. Mud rotary cuts the overburden and sets surface casing, then the head changes over to a DTH hammer for granite, basalt or hard limestone. What sits on the chassis Oil injected screw compressor, 17-35 m3/min at 1.05-2.5 MPa. Onboard mud pump and foam pump for the rotary section. 3.5 m feed stroke, 3 m rod
