Compact & Reliable Centralization for High resolution Imaging

Centralizing heavy imaging tools in deviated wells presents both mechanical and logistical challenges. In this case, an offshore operator in Asia needed to log a deep section where conventional Powered Positioning Centralizers (PPCs) have previously been used. While PPCs offer active control, their effectiveness in deviated wells is limited— primarily because they are fixed at the ends of the toolstring and do not provide direct centralization where it’s most needed, near the sensors. Additional tradeoffs include increased toolstring length, higher drag if not precisely managed, and added rig-up complexity. Seeking a more efficient and robust solution, SLB collaborated with Petromac to adapt its roller-based centralization technology for the 8.5” borehole environment. This compact, slip-over design replaced both PPCs and traditional fixed centralizers with passive mechanical rollers—enabling smoother tool travel and consistent centralization closer to the sensors. The result was a shorter, lighter toolstring, simplified rig-up, and clean, high-quality imaging data free from drag-related artifacts. The success of this deployment highlights the advantage of passive, mechanically simple conveyance systems in complex, high-deviation logging environments. When drag or deviation limit performance, roller conveyance ensures clean data and smooth deployment.