This paper describes the design, testing, and execution of a unique deepwater completion system that adapts a known multistage ball-drop system used in onshore unconventional reservoirs—for example, in the US and Canada—to a known horizontal openhole sand-control system to matrix acidize a 2000-m horizontal open hole effectively through a limited-entry liner with reservoir segmentation. The system uses a retrievable ball-drop diversion system (RBDDS) consisting of multistage fracture sleeves run on wash pipe.
Introduction
Low-permeability deepwater carbonate reservoirs have presented many challenges for economical production. The wells typically require extensive reservoir contact that must be stimulated in order to achieve an acceptable productivity index. Field A of the Albian carbonate in the Campos basin offshore Brazil falls into this challenging category (Fig.
