Lost-Circulation Additives : Materials added to drilling fluid to control or prevent lost circulation. These materials are added in varying amounts and are classified as fiber, flake, or granular. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}