Mud-Gas separator is used to separate gas from drilling fluid during well control operation. The separated gas is vented to safe distance from the rig while returning the drilling fluid to the active system in a controlled manner.
Mud-Gas Separator will have a vertical steel cylindrical body with openings on the top, bottom and side. It is closed at the vessel bottom with the mud return line directed back to the mud tanks. Mud leg is maintained in the separator by installation of an inverted U-shaped bend in the mud return line. Fluid level is adjusted by increasing / decreasing the length of the U-shaped bend.
The pressure loss in the gas vent line at the top of separator is less than the hydrostatic pressure of the mud column in the bottom of the separator in order to vent the gas at a safe distance from the rig.