... drilling rig: 1)Drilling depth,7000m, 2)Hook load, 4500kN, 3)Drawwork power,2000kw, 4)Auxiliary brake:E.T. N brake ZJ70/4500D rig ... is drived with 4 sets of CAT3512 diesel generating sets. 0~750V ... sets of motors, 2 sets of mud pumps are drived with 2 sets of motors separately. The front open mast and ...