Cup Packer : A packer with elastomer cups that are pushed out during fluid injection as the primary seal. Used for washing perfs and some testing. Only seals during fluid injection
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}