An Investigative Study of Potential Emulsion Problems Before Field Development

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractBefore the development of a field it is worthwhile to determine the characteristics of crude oil emulsions. This may be even more important if the wells are to be equipped with electrical submersible pumps (ESPs) which can create a shearing environment resulting in tight emulsions. One such study was conducted to determine the characteristics of emulsions from a cluster of oil fields planned for development. The proposed development is to produce from three fields and several different reservoirs. The central crude processing facility will process ~500 MBD of crude and 50 MBD of water. A study was conducted to determine the impact of ESP on emulsions and hence on the ESP design (horsepower) and the possibility of demulsifier injection downhole. The emulsion properties are also needed for the design of central wet crude handling facilities. A series of emulsion tests were conducted with crudes from different reservoirs at bottomhole and surface temperatures, range of watercuts and shearing conditions. The results are provided in terms of 'relative' tightness of emulsions from different reservoirs. The viscosities of various emulsions were also determined. The results indicate that demulsifier injection facilities will be needed at the wet crude handling facilities and possibly in wells from one reservoir that has a high asphaltenic and viscous crude. The paper provides a framework of laboratory emulsions studies that can provide valuable information for the design of processing facilities before they are built. The paper also discusses some practical aspects of demulsifier treatment program including demulsifier selection and optimization and methods to prevent emulsion problems.