Tortuosity : A description of the hindrance caused to flowing fluids as they attempt to enter the wellbore from a fracture or the formation. Also used to describe the deviation of the wellbore from a smooth path
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}