A Treater is applied to treat or process in the separation process that can be a vessel used to treat oil-water emulsions by any of several mechanisms so that the oil can be accepted by the pipeline or transport. In Oilfield, a Treater is a pressure vessel used for separating well fluids produced from oil and gas wells into gaseous and liquid components.

Reference Definition by Schlumberger Oilfield Glossary: Treater is a vessel used to treat oil-water emulsions so the oil can be accepted by the pipeline or transport. A treater can use several mechanisms. These include heat, gravity segregation, chemical additives and electric current to break emulsions. There are vertical and horizontal treaters. The main difference between them is the residence time, which is shorter in the vertical configuration compared with the horizontal one. A treater can be called a heater treater or an emulsion treater.

Related Definitions in the Project: The Process Engineering