The M-I SWACO Epcon Compact Flotation Unit (CFU) is a well-proven environmental solution to treating the increasing volumes of produced water. It has been shown to reduce oil in produced water content to below 5 ppm. Further, it has been validated as significantly reducing harmful soluble oil pollutants such as PAHs, alkylated phenols and BTEX compounds.
Epcon CFU technology is a reliable and cost-efficient alternative to traditional produced water treatment systems. It can be integrated with the Cyclotech B20 deoiling hydrocyclone to deliver ultimate separation performance.
The EPCON CFU technology is a vertical compact flotation vessel that separates oil from water. It has a smaller volume and shorter retention time than traditional flotation units. The water enters the Epcon CFU vessel horizontally, in a tangential direction. The separation process is aided by internal devices and a gas flotation effect caused by the release of residual gas from the water and/or added gas. Oil droplets are made to agglomerate and coalesce, facilitating separation from the water. Treated water exits through the bottom of the Epcon CFU vessel.
Separated oil and gas is removed in a continuous process via a suspended pipe at the top of the vessel. This multiphase flow – called the reject – is controlled by a valve located on the outlet pipe. The liquid rate of the reject reflects typically 1% of the overall inlet water flow to the Epcon CFU system. In addition, the oil content in this stream normally is 0.5 to 10%. A vessel with an operation volume of only 2.4 m3 (83 ft3) can treat a water flow up to 220 m3/h (33,000 bbl/d).
Single-step separation using the Epcon CFU technology has been proven to reduce the oil-in-water content to below 10 ppm, while simultaneously degassing the water. In some applications, two Epcon CFU vessels in serial operation have been proven to reduce the oil-in-water content to below 5 ppm.
Enhanced separation efficiency can be achieved with the introduction of chemicals such as flocculants and water clarifiers. Further, for soluble oil pollutants, its gas stripping effect optimizes reduction in dispersed oil. The use of flotation gas can reduce PAHs up to 83% and up to 880% in BTE Xs.
Epcon CFU technology is engineered to interface with other offshore and onshore production systems. It can be designed to fit all flow rates and can easily be customized to fit local conditions and requirements. Further, its benefits include:
Complementing the Epcon CFU technology is a series of added-value services, including: