高凝原油降凝剂的合成及复配性能研究

根据高凝原油组成以及降凝剂对原油的感受性确定了合成降凝剂的高碳醇的碳数,以丙烯酸和C18～C22混合醇为原料,合成丙烯酸高碳醇酯,得到三种聚合物:丙烯酸酯自聚物(AM),丙烯酸酯-醋酸乙烯酯(AMV)和丙烯酸酯-醋酸乙烯酯-苯乙烯(AVS)。比较了三种聚合物的降凝效果,选出AVS考察其合成条件并且与常用降凝剂EVA进行复配。实验结果表明:丙烯酸酯、醋酸乙烯酯、苯乙烯最佳配比为1∶1∶0.5,引发剂用量为1.2%,单体质量浓度30%,反应时间为7h时,三元共聚物AVS与EVA的复配物CPR可以使魏岗原油凝固点降低10℃,防蜡率达到40.62%。

Study on synthesis and complexing properties of depressant for high pour point crude oil

Suitable fatty alcohols were determined by component analysis of crude oil and the susceptibility of waxy crude oils to pour point depressant,higher alcohol acrylates were synthesized from acrylic acid and higher alcohol(C18~C22).Alcohol acrylate polymer(AM),alcohol acrylate-vinyl acetate copolymer(AMV) and alcohol acrylate-vinyl acetate-styrene(AVS)were synthesized as depressants for Weigang crude oil.AVS was chosen as the best one by testing the ability of depressing the pour point of crude oil,the synthetic condition of the three-monomer copolymer AVS were discussed by orthogonal test,and auxiliary agent EVA2 was screened out by depression efficiency and wax prevention.The results showed that the optimal synthetic conditions of AVS were as follows: the best molar ratio of alcohol acrylate,vinyl acetate and styrene was 1∶1∶0.5,the dosage of initiator was 1.2%,the monomer concentration of the reaction was 30% and the reaction time was 7h.The complex(CPR) with combination mass ratio of 1∶2 of AVS and EVA could reduce pour point for Weigang crude oil by 10℃ at amount of 0.5%,paraffine removing rate is as much as 40.62% with 0.3% CPR.