泡沫剂辅助蒸汽与孤岛稠油相互作用研究

模拟了以孤岛现场用DHF作为泡沫剂辅助蒸汽驱过程,泡沫剂浓度为0.2%~1.5%,作用温度为65~200℃,油水质量比为3∶1,作用压力8 MPa,研究其对孤岛稠油界面性质、油品胶体稳定性、四组分组成以及重组分胶粒粒度的影响规律。结果表明,在蒸汽作用下,提高泡沫剂质量分数,可降低稠油-水界面张力,降低油品沥青质组分含量,增大胶质/沥青质之值;沥青质组分分子量减小,沥青质聚沉起始点增大,稠油胶体稳定性提高。在泡沫剂辅助过热蒸汽与稠油作用下,提升作用温度,会引起稠油-水界面张力降低,稠油沥青质聚沉起始点减小,胶体稳定性降低;同时稠油中沥青质组分含量增大,胶质/沥青质的值减小,沥青质组分分子量增大。

Study on the interaction of frother assisted steam flooding and Gudao viscous crude oil

With Gudao heavy oil as raw material,studied the interfacial properties,colloidal stability, structural composition and recombinant sub-particles size of heavy oil reacted by frother DHF auxiliary steam drive,when the concentration of frother is 0. 2% ~ 1. 5%,the temperature is 65 ~ 200 ℃,oil-water mass ratio is 3 ∶ 1 and the pressure is 8 MPa. Result shows that under the action of superheated steam,the interfacial tension decreases with the adding of frother,when increasing the amount of frother,there is a trend of decrease in interfacial tension,asphaltene content decreases,the ratio of resin and asphaltene of oil sample increases,the molecular weight of asphaltene decreases,the association degree of asphaltene decreases,the oil＇s starting point of coagulation of asphaltene increases,and colloidal stability becomes better. Under the action of superheated steam-frother-heavy oil reservoir,when increasing the temperature, the interfacial tension decreases,the oil＇s starting point of coagulation of asphaltene decreases,colloidal stability becomes worse; meanwhile asphaltene content increases,the ratio of resin and asphaltene of oil sample decreases,and the molecular weight of asphaltene increases,and the association degree of asphaltene increases.