1. n. [Drilling]
A device that removes air or gases (methane, H2S, CO2, and others) from drilling liquids. There are two generic types that work:
If the gas content in the mud is high, a mud gas separator or "poor-boy degasser" is used, because it has a higher capacity than standard degassers and routes the evolved gases away from the rig to a flaring area complete with an ignition source.
See: desander, gas separator