Jetting 4 : The process of periodically removing a portion of, or all of, the water, drilling fluid, and/or solids from the pits, usually by means of pumping through a jet nozzle arrangement. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}