The Synthesis Of A New Kind Of Demulsifier And Its Evaluation

In order to demulsify the production fluid effectively, a new kind of demulsifier, which can be used at lower temperature, was investigated.In this paper, acrylic acid and SP169, a kind of polyether demulsifier, was selected to synthetise a comb-like demulsifier. The reaction included two steps: esterification and polymerization, and the reaction conditions were probed. Based on these studies, another two comb-like demulsifiers, named by TA1031 demulsifier and AE8031 demulsifier, were synthetised by one pot reaction of acrylic acid and TA1031, acrylic acid and AE8031, respectively, the evaluation indicated that such demulsifier showed excellent performance of demulsification for oils from 101 station, xin-1 station and xin-3 station in shengli oil field. For oil from xin-3, the final dehydration rate of TA1031 comb-like demulsifier was up to 65.8% within mass concentration of 100mg/L at 55℃, while for TA1031, the raw material, it was only 2.7% at the same conditions, used for oil of bin nan, the final dehydration rate of TA1031 comb-like demulsifier was up to 51.6% within mass concentration of 100mg/L at 30℃, while it was only 8.2% with TA1031. These results confirmed that, to improve performance, conventional demulsifier can be modified into comb-like polymer by adequate means.To probe the mechanism of demulsification futher, the effect of natural demulsifier, including the raw demulsifier and its modifier, on the stability of interface film, oil/water interfacial tension and their oil/water distribution ratio, was studied. The results showed that the come-like ones were superier to the unmodified ones, they broken interface film and decreased interfacial tension more easily, and their oil/water distribution ratio was closer to 1.