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Experimental study on enhanced deaquation process for extra-heavy crude oil using dehydrant
WU Ben-cheng, ZHU Jian-hua, JIANG Chang-qi
(Faculty of Chemistry and Chemical Engineering in China University of Petroleum , Beijing 102249, China)
Abstract:
According to the analyses of water status and the nature of extra-heavy crude oil in Liaohe Oilfield, the thermal-chemical and electric-chemical deaquation experiments were carried out,and the extra-heavy crude oil samples with and without deaquation processing were characterized. The experimental results demonstrate that with the synergetic effect of the dehydrant and demulsifier, the deaquation rate of the extra-heavy crude oil is obviously higher than that of the thermal-chemical deaquation process used in the commercial deaquation for extra-heavy crude oil at present, whether or not exists the electric field. Especially, the electric-chemical deaquation process could achieve the deep deaquation effect in relative less time for the extra-heavy crude oil. The processed extra-heavy crude oil property with the dehydrant was improved. For the processed crude oil samples, the metal content was obviously decreased and the viscosity could be decreased by 40% at 50 C , which improves the hydraulic behaviors of oil samples, and is beneficial to the downstream processing. Therefore this new technique would become the alternative technique that is suitable for extra-heavy crude oil pretreatment in Liaohe Oilfield.
Key words:  extra-heavy crude oil  pretreatment  deaquation  dehydrant