Model ZJ50D Nominal drilling depth (5"drill pipe)3000～4500 m (41/2"drill pipe) 3500～5000 m Maximum hook load 3150kN Winch maximum input power 1100kW Hook speed 0～1.275m/s Spotting hoist 4+4R continuously variable transmission Rotary table gears I+IR continuously variable transmission Deadeye diameter 6×7; Φ35mm Mud pump model and total power F-1600；2×1180kW Rotary table model and opening diameter ZP375； 952.5mm Derrick structure and effective height K type；45m Base type Swing-up type/slingshot substructure Diesel generating set and output power 3×1310kW Motor power and set DC motor800kW×7