Drilling optimization : drill bit performance optimization using DROPS simulator ( Ekofisk/Eldfisk Field)

Abstract

Two drilled Wells: Well A and Well B were analysed under the following input data; drilling parameter, survey data, lithology data and bit information using DROPS simulator to showcase the bit performance optimization potentials. Apparent Rock Strength Logs (ARSL) were generated automatically by the simulator for the two drilled wells to give an idea of how hard is the formatiom and the rate of penetration possible for the bits. Interesting plots of the Apparent Rock Strength, Rate of Penetration, Weight on Bit, Revolution per minute, pump flow rate, Plastic Viscosity, mud Weight and Bit wear versus depth for the Well A and Well B were expressly presented in this project work. Appreciable cost per foot savings was made after the bit performance optimization simulation have been performed and a much more better savings could have been made if actual figures and parameters were used rather than assumed. A better bit selection was made using ROP, drilling time, bit wear constant ( automatic evaluation by DROPS simulatior), bit cost and cost per foot for selection criteria. Bit hydraulics analysis as relevant to cutting removal was adequately explained and evaluated for each bit used during the drilling in the bit performance optimization using the DROPS simulator.