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Three Phase Oil-Water-Gas Separators The term separator in oil field terminology designates a pressure vessel used for separating well fluids produced from oil and gas wells into gaseous and liquid components.Separators work on the principle that the three components have different densities, which allows them to stratify when moving slowly with gas on top, water on bottom of the separator.When there is a large volume of gas to be separated from the liquid (oil and water), the vessel is called a three- phase separator and either the gas capacity requirements or the water-oil separation constraints may govern the vessel design.Three-phase separators may be either horizontal or vertical pressure vessels similar to the two-phase separators described above.Generally, water produced with the oil exists partly as free water and partly as water-in-oil emulsion.The volume of gas depends largely on the producing and separation conditions.However, three-phase separators will have additional control devices and may have additional internal components.

Three Phase Oil-Water-Gas Separators
The term separator in oil field terminology designates a pressure vessel
used for separating well fluids produced from oil and gas wells into
gaseous and liquid components. Separators work on the principle that the
three components have different densities, which allows them to stratify
when moving slowly with gas on top, water on bottom of the separator. Generally, water produced with the oil exists partly as free water and
partly as water-in-oil emulsion. Free water produced with the oil is
defined as the water that will settle and separate from the oil by gravity. Along with the water and oil, gas will always be present and therefore, must be separated from the liquid. The volume of gas depends largely on
the producing and separation conditions. When the volume of gas is
relatively small compared to the volume of liquid, the method used to
separate free water, oil, and gas is called a free-water knockout. In such a
case, the separation of the water from oil will govern the design of the
vessel. When there is a large volume of gas to be separated from the
liquid (oil and water), the vessel is called a three- phase separator and
either the gas capacity requirements or the water-oil separation
constraints may govern the vessel design. Free-water knockout and three-phase separators are basically similar in
shape and components. Further, the same design concepts and procedures
are used for both types of vessel. Therefore, the term three-phase
separator will be used for both types of vessel throughout this section. Three-phase separators may be either horizontal or vertical pressure
vessels similar to the two-phase separators described above. However, three-phase separators will have additional control devices and may have
additional internal components.