Macaroni String 2 : A small diameter string, usually attached to the outside of the tubing, used to place inhibitors and other chemicals downhole. May also be used to describe any small tubing
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}