Fiber or Fibrous Materials : Any tough stringy material used to prevent loss of circulation or to restore circulation. If field use, fiber generally refers to the larger fibers of plant origin. (Bul 10C, Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}