Rag Pump : A rod pump with extremely loose tolerances (an loose seals) that may be temporarily run in a well to pump fluid that contains sand. Used for clean-ups after a fracture treatment
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}