J

Jet.: See: eductor .
Jet hopper.: A device that has a jet that facilitates the addition of drillingfluid additives to the system. See: hopper, mud hopper.
Jetting.: The process of periodically removing a portion of the water, drilling fluid, and/or solids from the pits, usually by means of pumping through a jet nozzle to agitate the drilling fluid while simultaneously removing it from the pit.
Jones effect.: The net surface tension of all salt solutions first decreases with an increase in concentration, passes through a minimum, and then increases as the concentration is raised. The initial decrease is called the Jones effect.