分离多环芳烃用于超稠油掺稀降黏的研究

STUDY ON SEPARATED POLYCYCLIC AROMATIC HYDROCARBONS FOR THINNING AND VISCOSITY REDUCTION OF ULTRA-HEAVY OIL

针对炼油厂催化裂化柴油大量过剩和芳烃含量过高等问题,结合稠油掺稀降黏开采掺稀比高、稀油资源紧缺的现状,从催化裂化柴油中萃取分离多环芳烃,用于超稠油掺稀降黏研究。对多环芳烃萃取进行正交试验,在筛选出的最佳操作条件(萃取温度为45℃、萃取时间为5 min、相分离时间为5.5 min和剂油体积比为1.4)下,多环芳烃产品收率为29.87%、芳烃质量分数高达99.07%。在掺稀比均为0.10时,多环芳烃和塔河稀油的掺稀降黏量率分别为94.20%和68.58%。拟合计算结果表明,多环芳烃用量仅为塔河稀油的16.32%时,即可达到塔河油田稠油掺稀降黏要求。以塔河油田稠油自喷井为例,当稠油含水率分别为0,30%和50%时,掺入多环芳烃相对掺入稀油的单井日产油增长率分别达到115.90%,84.57%,62.20%。

Aiming at the problems of large excess of FCC diesel fuel in refineries and high aromatic content in FCC diesel fuel,and the present situation of heavy oil production by blending dilute and viscosity reduction with high blending ratio and scarce resources of diluted oil,extraction and separation of polycyclic aromatic hydrocarbons from FCC fuel were used for the study of ultra-heavy oil blending dilute and viscosity reduction.Orthogonal experiments were carried out for the extraction of polycyclic aromatic hydrocarbons.Under the selected optimal operating conditions(agent-oil volume ratio 1.4,extraction temperature 45℃,extraction time 5 min and phase separation time 5.5 min),the yield of polycyclic aromatic hydrocarbons was 29.87%,and the content of aromatic hydrocarbons was as high as 99.07%.At the same dilution ratio of 0.10,the viscosity reduction rates of polycyclic aromatic hydrocarbons and Tahe thin oil were 68.58%and 94.20%,respectively.The fitting results showed that when the polycyclic aromatic hydrocarbon consumption was only 16.32%of Tahe oilfield thin oil,the heavy oil blending with thin oil could meet the viscosity reduction requirements of Tahe oilfield.Taking the heavy oil self-flowing wells in Tahe oilfield as an example,compared with thin oil,when the water content of heavy oil was 0,30%and 50%,the daily increasing oil production growth rate of single well with polycyclic aromatic hydrocarbons reached 115.90%,84.57%and 62.20%,respectively.