... drilling rig: 1)Drilling depth,7000m, 2)Hook load, 4500kN, 3)Drawwork power,2000kw, 4)Auxiliary brake:E.T. N brake ZJ70/4500D rig ... current brake.Features:Adopts one time raising type, substructure, mast and all equipments are installed at low ... and substructure by the power from the winch.It can satisfy the requirement for explosion-proof, safety, drilling engineering ... (42)141 (43)148 (45) drilling rig