Bottom Hole Horsepower
Determination of the amount of Bottom Hole Cleaning necessary to maximize the drill rate is based upon:
1. Hydraulic (Jet) Impact Force
2. Hydraulic Horsepower
Maximizing Hpb involves minimizing Hpc, or in other words, the lowest flow rate and the highest pump pressure will result in the highest Hpb. However, the “lowest flow rate” will usually result in inadequate bottom hole cleaning. To compensate for this, bottom hole pressure can be increased by using smaller jet nozzles.
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