Preparation and performance evaluation of low temperature emulsifier for oil-based drilling fluid
Oil-based drilling fluid has stable properties,which is often used in complex formation development.However,the viscosity and shear force rise too fast in sub-zero low temperature environment.In order to solve this problem,a low-temperature and high-performance emulsifier ZF-SB was prepared.The emulsifier had an ultra-low freezing point(-33℃),which can solve the problem that traditional liquid emulsifiers cannot flow at zero temperature,and significantly reduce the interfacial tension of oil and water.The emulsion prepared by this emulsifier had a particle size of 0.6～4.2μm with narrow particle size distribution and a demulsification voltage of 1397V.It was conducive to the stable state of oil-based drilling fluid at low temperature.In addition,the oil-base drilling fluid prepared by low-temperature emulsifier ZF-SB had good fluidity at sub-zero temperature,which can avoid the problems of high ECD value,loss and pressure control caused by the thickening effect of low temperature.
emulsifieroil-based drilling fluidrheological propertylow temperature resistanceinterfacial tension
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