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* Pump pressure
* Pump pressure
* Jet nozzle size(s) of the bit
* Jet nozzle size(s) of the bit
* Mud rheology (plastic viscosity and yield point)
* Mud rheology (plastic [[viscosity]] and yield point)
* Mud weight and effective circulation density
* Mud weight and effective circulation density
* Formation balance gradient (mud weight required to equalize formation pressure)
* Formation balance gradient (mud weight required to equalize formation pressure)