[This article belongs to Volume - 38, Issue - 06]

Prediction of Surge and Swab Pressures and Safe Tripping Speed for Reducing Hole Problems in Rumaila Iraqi Oil Field

Surge and swab pressures are additional pressure drop due to the pipe movement upward/downward during drilling activities including drill string reciprocation and tripping operations. It describes the changes in pressure in the annulus because of pipe movement, resulting in a variety of expensive drilling issues, such as well kick, formation breakdown, and lost circulation. The key objective of this study is to examine the factors that influencing the surge and swab pressures and determine the extent of their influence., In addition to optimizing the drilling parameters that determine the greatest pipe tripping speed without of surging and swabbing effects. To detect the changes in surge and swab pressures. Sensitivity analysis was done utilizing various drilling parameters such as mud rheology, mud characteristics, hole diameters, as well as different wellbore geometry (bit diameter, drill pipe diameter, hole diameter), and different BHA assembly dimensions. Dynamic surge and swab model was employed to simulate a case study in Rumaila Iraqi oilfield. In contrast to pipe diameter and drilling mud rheology, the findings indicated that annular clearance and BHA size and length have a major effect on the surge and swab pressures. In future investigations, mud temperature can be considered as part of the sensitivity analysis. The results of this study can be used to improve drilling efficiency in Rumaila oil field with decreasing non-productive time (NPT) by employing the appropriate tripping speed and optimal drilling operations.