According to the current technologies during the last decade more attention has been given to design and develop novel completion fluids and additives which can meet most of requirements and challenges in comparison with conventional types of fluids. The aim of this work is to summarize and perform an extensive overview for different types of completion brines including the additives, to make a comparison and underline their main benefits and drawbacks. It describes development of innovative completion fluids which are cost effective and less problematic.