Abstract: A blow down apparatus for a well has a tank for receiving an emulsion of water and natural gas, a piping connectable to a well from which the emulsion is supplied and connected to the tank so as to direct a flow of the suspension from the well into the tank, a control valve provided in the piping for closing and opening the piping, a vent for venting the gas from the vessel to atmosphere, and a transporting structure for transporting the apparatus to and from the well, the tank and the piping unit being mounted on the transporting unit.