Optimize Drilling Hydraulics for the Basic System

The basic system means the drill string consisting of drill pipe, drill collar and a bit (no downhole tools). The process for drilling hydraulic optimization is simple. The following steps demonstrate how to optimize drilling hydraulics for the basic system.

• Select drill pipe and drill collar which provide pressure loss at a minimum for the range of depth and flow rate.

• Decide the methods to optimize drilling hydraulics. If you drill a shallow hole section, the maximum impact force is recommended. However, if you drill a deeper section, the maximum hydraulic horsepower is better than the maximum impact force.

• Determine flow rate to meet your optimization requirement at the end of the bit run. The curve below gives you a idea how you can get the flow rate from the char at each particular optimization method. 

• Determine the total bit nozzle area (total flow area) which can meet the requirement within the maximum constraint of equipment.

Reference:  Drilling Hydraulic Books

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