Field Case Study of Drill Bit Performance Analysis in Valhall Flank West

This thesis will present relevant literature study, data quality assertion and performance evaluation and economic considerations based on field data from Valhall Flank West. The aim is to investigate, explain and suggest improvements for wells drilled in this field. From the overall studies, the results showed that: ❖ Data quality is very poor despite the wells being drilled in the timeframe of 2019 – 2020, hence supporting the continued need and push for improved digitalization ❖ Bits of size 8.5 in. and 6.5 in. performed at a significantly lower ROP and significantly higher MSE and d-exponent than bits of bigger sizes, hence suggesting high droppage of drilling efficiency for the lower sections ❖ The existence of calcite stringer and geological effects on drilling ❖ Economic considerations and the importance of long bit runs for cost reduction