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Vacuum degasser and mud gas separator

Vacuum degasser and mud gas separator are all the degassing equipment in oil&gas drilling fluid recyclong system. But working performance is different, now I will introducing its difference of vacuum degasser and mud gas separator.

Installation location

Vacuum degasser is usually to be as the second stage solid control equipment which is located the back of shale shaker and in front of desander and desilter. But mud gas separator is in front of the shale shaker.

mud gas separator

Degassing effect

Vacuum degasser can get rid of various gas of invasive drilling quickly. Vacuum degasser is very important for returning mud gravity, stabilizing mud viscosity and reducing drilling cost. Also, at the same time vacuum degasser can be used as a heavy-power agitator and supported applicable to all types of mud circulation purification system. But mud gas separator is commonly called a gas-buster or poor boy degasser. It captures and separates large volume of free gas within the drilling fluid. If there is a “KICK” situation, this vessel separates the mud and the gas by allowing it to flow over baffle plates.

vacuum degasser

Operational Theory

Vacuum degasser utilize negative pressure by vacuum pump to withdraw entrained gases from the mud. In order for this to work, mud is pumped through a venturi, which develops a negative pressure in the vessel by vacuum pump, thus sucking mud into the unit. The choice between horizontally- or vertically-mounted units is typically based on the footprint requirements of the specific rig.

The working principle of the mud gas separator( poor boy degasser )is simple. The drilling mud with gas mixture in the bore hole is transferred by mud return lines to the inlet of the mud gas separator, allowing it to impinge on a series of baffles which separates gas from drilling mud. The free gas flows into the flare line to be burned and the mud discharges to the shale shaker and to the mud tank.

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