Plunger Lift : A method of lifting oil using a swab or free piston propelled by compressed gas from the lower end of the tubing string to the surface. (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}