Petrochemistry and Chemical Engineering

Biography

Biography: YuQi Yang

Abstract

A new compound viscosity reducer SDG-2 is discussed in this paper. Emulsification effect, droplet size distributions, interfacial tension, emulsion morphology and field test were investigated to better show the advantages of compound viscosity reducer compared to oil-soluble and water-soluble viscosity reducer by FM200 high speed homogenizer, interfacial tensiometer, interfacial rheometer and optical microscopy and so on. The results show that the SDG-2 can emulsify ultra-heavy oil (1.81×105mPa•s) which cannot be emulsified by commercial water-soluble viscosity reducers, the average droplet size of the stable emulsion was 2.415um and demulsification was not influenced. Much lower oil-water interfacial tension with SDG-2 than that with oil-soluble viscosity reducer at the same concentration. The rate of viscosity reduction can reached 99% at 50℃ and 95% at 90℃ with SDG-2 compared to 95.6% at 50℃ and 90.3% at 90℃ with oil-soluble viscosity reducer indicated that the SDG-2 is more effective than commercial oil-soluble viscosity reducer. In addition, it also has characteristic of broad applicability which is suitable for ultra-heavy oil viscosity ranged from 2.0×104mPa•s to 1.0×105mPa•s. Field tests of the newly developed compound viscosity reducer was carried out in Tahe Oilfiled in China, and the results showed that 66.6% less light oil was needed to dilute the heavy oil to achieve the needed viscosity and enhance the ultra-heavy oil recovery rate by 22.5%. We have interest to see its remarkable economic and social benefits.