<p>In tight reservoirs, crude oil is easy to be self-emulsified to form W/O emulsion, which increases the viscosity of the system. At the same time, the emulsion droplet tends to block when passing through pores, which affects the effect of oil displacement. In order to study the emulsification behavior under different pore size, this paper Researched the influence of factors such as colloid, asphaltene, water content, pH value and salinity on the emulsification of tight sandstone crude oil in a block in Xinjiang Province under different pipe diameters. Demulsification time, water content, emulsion droplet size and interfacial tension of the emulsion were observed, and The comparison shows that crude oil is easy to self-emulsify with water to form W/O emulsion and is not easy to demulsify. When the moisture content is 80%, the viscosity of emulsion reaches 1476mPa·s, 25 times higher than the original viscosity; Water content is more than 90%, oil and water can not be fully emulsified, the formation of emulsion stability is extremely poor; With the increase of salinity, the concentration of ions in aqueous phase has a positive effect on demulsification and the stability of emulsion decreases; Under acidic and alkaline conditions, the emulsion is more prone to demulsification; Asphaltenes and colloid dispersed in alkanes have important stabilizing effects on emulsion; The diameter is related to the stability of emulsion, In the small diameter, the demulsification time was shortened and the emulsion stability was deteriorated.</p><p>Key words: emulsion stability; Influencing factors; Aperture;</p>

Research on Influencing Factors of Heavy Oil Emulsification

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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