Three-phase separator: When Oil and gas flow from Wells after the entry of separator get into the separator, Oil and gas flow pass the absorb energy device of separation, and finish the first separation. After the first phase separation ,the Oil and gas flow get buffer again through the corrugating plate, further removed the fog from the airflow, So that residual droplet were removed.The Separated gas released from tanks in through the gas exports after catching the vortex air regulator,and get into vent pipe Through measuring stomatal board device and pneumatic – valve.After liquid enter the mixing chamber, rely on gravity separation principle, make oil natural in liquid, and the water in liquid bottom, after the Oil get into oil chamber through the internal clapboard of the separator, finish the three-phase separation. The bottom of the Separator has export of oil and water respectively, and enter  into respective process through the oil-water measurement.