Crude oil emulsion laws and countermeasures, Tahe oil field

The super deep carbonate fractured-vuggy heavy oil reservoirs in the Tahe oil field have a strong he-terogeneity and are featured by "super depth, super thickness, high asphaltene-containing colloid, high hydrogen sulfide content, and high salinity". The laws and countermeasures of crude oil emulsion in production wells were studied. The composition of emulsified oil in different wells and during different production stages were compared, founding that super heavy oil layered in formations and flowed at different speed as density changed. Du-ring the gas injection for different oils, the contents of asphalt, colloid and paraffin wax changed, resulting in oil emulsion. We usually use demulsifier, and add salt water from wellhead to reduce the viscosity of emulsified oil and enhance its liquidity. For gas injection wells, we inject foaming agent to prevent oil from contacting water, which can reduce crude oil emulsion.