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Operating principle of mud gas separator

2015-05-04

Mud gas Separators seats beside mud solids control system and is used only when the drilling formation exists toxic and hazardous gases which is also known as Poor boy degasser, Liquid-gas separators, Gas Buster in world market.

Mud gas separator enables more efficient separation of emulsions and gas-cut mud in either oil or gas environments and minimizes gas-cut mud and mist carryover. 

The operating principle of a mud/gas separator is relatively simple. The device is essentially a vertical steel cylindrical body with openings on the top, bottom, and side. 1. The mud and gas mixture is fed into the separator inlet and directed at a flat steel plate perpendicular to the flow. This impingement plate minimizes the erosional wear on the separator's internal walls and assists with mud/gas separation. Separation is further assisted as the mud/gas mixture falls over a series of baffles designed to increase the turbulence within the upper section of the vessel. The free gas is then vented through the gas vent line, and mud is returned to the mud tanks.

Operating pressure within the separator is equal to the friction pressure of the free gas venting through the vent line. Fluid is maintained at a specific level (mud leg) within the separator at all times. If the friction pressure of the gas venting through the vent line exceeds the mud-leg hydrostatic pressure within the separator, a blow-through condition will result sending a mud/gas mixture to the mud tanks. As one can readily see, the critical point for separator blow-through exists when peak gas flow rates are experienced in the separator. Peak gas flow rates should theoretically be experienced when gas initially reaches the separator.