What is the function of mud gas separator?

Mud Gas Separator is commonly called poor boy degasser. It captures and separates the large volumes 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.

The mud gas separator is the preferred equipment for treating drilling mud, but different drilling fluids contain different chemicals, so there will be different precautions for handling.

1.Gravity separation
Gravity separation is determined by the difference in density between substances, the height of the liquid column, the size of the bubbles, and the flow resistance inside the liquid. A simple drilling fluid tank or fracturing tank is a gravity separator that can store liquid, solids, and gases until they separate naturally. Gas rises and escapes from the top of the tank, and oil separates from other liquids and floats to the top of the liquid. When the oil overflows the overflow or the built-in baffle of the tank, it is pumped away, and the drilling fluid and other liquids (such as brine) are removed near the bottom of the tank. The solid phase settles to the bottom and remains there or is mixed into the liquid and then removed with conventional solid phase control equipment. Gravity separation is the main method used for oil/water separation tanks and closed pressure separators.

2. Centrifugal separation
The drilling fluid is fed tangentially into a circular container or a rotating cylindrical container and rotated. Oil, gas, water and solid particles are separated by artificial gravity generated by the centrifugal force of the rotating fluid. This method is used in many open or West Texas separators, while the splash wire spiral is often used in some closed pressure systems to produce gravity separation.

3. Impact, deflection and spray separation
Impact, deflection and spray separation is to make the drilling fluid hit the deflector at a higher flow rate to separate the gas. The drilling fluid discharged from the overflow pipe or the chip discharge pipe can be directly separated, or the drilling fluid flow rate can be increased by a pump before separation.

4. Parallel plate and film separation
Parallel plate or film separation is for gas in drilling fluid. The drilling fluid spreads out like a film on the parallel plates, making it easier for the gas to escape.
1) In the parallel plate separator, the drilling fluid containing gas is pressed between two parallel plates, which causes the bubbles to distort and deform, which helps them to break. This is very common in commercial defogging and defoaming.
2) Film separation is to let the drilling fluid move on the flat plate in the form of a film, which causes the bubbles to expand and then break. This film treatment is used in most vacuum degassing devices.

5. Vacuum separation
The Vacuum Degasser is used to separate the gas mixed in the drilling fluid. It uses reduced pressure to cause the bubbles to expand and burst. This method is often used in the degasser to remove the gas mixed in the drilling fluid.

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