J Profile : A profile design (less common than F, S, and X). The F allows circulation with the annulus. Used in place of a sliding sleeve, but does present a restriction
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}