Analysis of Factor Effects and Interactions in a Conventional Drilling Operation by Response Surface Methodology and Historical Data Design.

A smooth drilling process can achieve safe and fast well establishment and better investment efficiency. Response surface methodology (RSM) on Design Expert 10.0.1 (Stat Ease Inc., Minneapolis, USA) was utilised for the factor effects and interactions in a conventional drilling operation. The aim of this study was to utilise RSM and historical data design (HDD) was used to model the effect of weight on bit (WOB), hook load and revolutions per minute (RPM) on the rate of penetration (ROP), pressure and torque of drilling. Statistical validation of the data was conducted using Analysis of Variance (ANOVA) Partial sum of squares - Type III. The models for all three responses were statistically significant (at a significance level of p < 0.05). At low RPM (80 - 81 Hz) and an intermediate hook load (235 - 240 lb), ROP was observed to be high. It was observed that the torque is optimal anywhere above a hook load of 235 lb. The pressure was highest at high RPM (83 -- 85 Hz) and low WOB (8 - 12 lb). From this study, the effects of process factors on drilling parameters have been successfully modelled and investigated. [ABSTRACT FROM AUTHOR]