Previous offset wells drilled in the layered sandstone differentially pressured reservoir formations offshore Malaysia in 1341m water depth, using conventional open system drilling techniques, had experienced lost drilling fluid circulation and hydrocarbon gas kick events, resulting in significant non-productive drilling time, and well control events.

This paper describes how advanced Managed Pressure Drilling (MPD) technology, combined with a drill string conveyed subs based (CCS) continuous circulation system, were deployed on a tender assist semi-submersible rig, and used to effectively and safely drill subsequent development wells. Techniques employed on the project also included Dynamic MPD Well Control and Formation Evaluation procedures, along with dynamic Managed Pressure Cementing (MPC) techniques.

MPD and CCS systems were used, along with MPC, to effectively drill and complete sandstone reservoir layers at various formation pressures depleted from ongoing production, and also over pressured layers charged as a result of water injection activity.

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