Compact D-gasser Working Principle: The degasser is a vacuum-type one, that is, by dint of the suction effect of vacuum pump, negative pressure space is created in vacuum container, and under the effect of atmospheric pressure, the mud enters the hollow shaft of rotor via suction pipe and then spurts onto the container wall from the windows in hollow shaft. For collision and separation wheels, the drilling fluid is separated into thin layers, the bubbles in mud break and the gas escapes. Through suction of vacuum pump and separation of gas-water separator, the gas is exhausted to safety zone via exhaust pipe of separator and the mud is discharged out of the container by the impeller. Since the main motor first starts and the impeller rotates in a high speed, the mud enters the container only via the suction pipe, not via drain pipe.