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A degasser is a device used in drilling to remove gasses from drilling fluid which could otherwise form bubbles.For a small amount of entrained gas in a drilling fluid, the degasser can play a major role of removing small bubbles that a liquid film has enveloped and entrapped. In order for it to be released and break out the air and gas such as methane, H2S and CO2 from the mud to the surface, the drilling fluid must pass degassing technique and it can be accomplished by the equipment called degasser which is also a major part of a mud systems.
Vacuum Tank Degasser Vacuum Type is the most common form of degasser. It can be horizontal, vertical or round vessel. A vacuum action is created to pull in the gas cut mud. When the liquid enters the tank it will flow and be distributed to a layer of internal baffle plates designed for the mud to flow in thin laminar film and is exposed to a vacuum that forces the gas to escape and break out of the mud. The vacuum pump moves the escaping gas from the vessel discharging it to the rig's flare or environmental control system.
Atmospheric Degasser This type of degasser processes mud by accelerating fluid through a submerged pump impeller and impinging the fluid on a stationary baffles to maximize surface and thus enable escaping gas vent to atmosphere.