ROP Modeling for Volcanic Geothermal Drilling Optimization

Abstract

Cost per Foot and Mechanical Specific Energy are two methods that currently used in optimizing the actual rotary drilling process. Rate of Penetration (ROP) is one of the most crucial factors to be analyzed in optimizing drilling operation. Rate of Penetration is influenced by: 1) Bit Selection, 2) Compressive Strength and Abrasiveness of Formation, 3) Drilling Fluids Properties, 4) Weight on Bit and Rotational Speed, 5) Bit Tooth Wear, and 6) Bit Hydraulics. Given that geothermal fields in Indonesia are generally located in areas with volcanic rock formations which have high temperature, high Compressive Strength, and abrasive, ROP equation that formerly formulated by Bourgoyne and Young needs to be developed into justified ROP modeling for volcanic geothermal wells in Indonesia as a reference for wells drilling optimization.