A vessel into which drilling mud is pumped to remove gas entrained in the drilling mud. Modern, compact degassers use three commonly recognized methods of degassification: centrifugal force, turbulence, and vacuum, See degassing drilling Mud.

Degassing drilling mud

An important part of well-drilling operations is keeping the drilling mud free of entrained gas, or bubbles that enter the mud as it circulates downhole throgh gaseous formations. One of the three functions of mud is to provide sufficient hydrostatic head to control a kick when high-pressure oil or gas is encountered.

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Vacuum Degasser Working theory:

When mud of a certain density is circulated, it can become infused with gas to an extent that, although the volume of mud may increase, the density is severely reduced. To guard against this dangerous situation, the mus is degassed at the surface. Several kinds of equipment get the gas out, but all have one aim in common: to make it possible for the gas bubbles to free themselves.

vacuum degasser

 

One method flows the mud over wide sheets so the slurry is no more than one-eight to three-eights thick and the bubbles may come to the surface and escape. Another method sprays the mud against a baffle in a spray tank that squeezes out the gas. A third method directs the mud through a vacuum tank where, under reduced atmospheric pressure, the bubbles of gas expand and break out of the slurry.

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