This paper deals with the adaptation of synthetic drilling fluid for use in milling operations in offshore wells. Main topics covered include: a discussion on the fundamentals of solids transport highlighting the critical aspects of transporting iron particles in offshore wells; a computer simulation task, based on solids transport mechanistic models, to define minimum requirements for fluid flow rates and rheological properties; an extensive experimental work comparing the carrying capacity of water and synthetic based fluids and; the process of field implementation concentrating on well succeeded experiences in the offshore fields operated by PETROBRAS.

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