Free Water 2 : (1) the excess water that separates from a cement slurry on standing. (2) the first water that separates from the crude oil in the first stage of the separator (free water knockout or FWKO)
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}