Pressure Falloff : The rate at which pressure decreases at the end of an injection. Related to rock permeability, and to fracture closure stresses when above the fracture point
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}