DEPRO is a comprehensive torque, drag, and hydraulics program. Using this software, users can reduce many of the risks encountered in drilling and completion operations. DEPRO predicts the limits in the length of a horizontal well based on specific friction factors, recommends rig specifications, and evaluates the required weight to set a packer. For hydraulics, DEPRO covers downhole circulating pressures, surge and swab, equivalent circulation densities (ECD), bit optimization, hole cleaning, and volumetric displacements. Using DEPRO, downhole drilling hydraulic conditions can be fully examined and any potential problems can be identified prior to field execution. Torque, drag, and stress calculation. Soft and stiff string models. Drilling, back reaming, rotation off the bottom, tripping in and tripping out operations. Sinusoidal and helical buckling prediction. Field data comparison on workload and surface torque. Friction factor sensitivity analysis. Packer setting analysis.