Liquid-Gas Separator is a solid control equipment for primary degassing of the gas infiltrating drilling fluid, It is mainly used to remove large bubbles with a diameter of ф3-ф25mm in the gas infiltrating drilling fluid.These large bubbles are the majority of expanding gas in the drilling fluid that fills a section of the wellbore annulus,if it is not removed, it will easily cause a kick and even spray out the surface of the drilling disc.