摘要
针对超稠油黏度高、流动性差和地层水矿化度高等现状,以表面活性剂、碱、有机磷酸为原料制得乳化降黏剂,对降黏剂配方进行了优选,研究了矿化度和温度对降黏剂降黏性能的影响,并分析了降黏机理。结果表明,超稠油乳化降黏剂最优配方为:质量比为1∶1的磺酸盐类阴离子表面活性剂YBH与醇醚羧酸盐类的阴、非离子表面活性剂YFBH复配的主剂、碱助剂、耐盐助剂NYZJ-1的质量比为1.1∶0.45∶1.15。在主剂、助剂总加剂量为0.81%(占原油乳状液的质量分数)、乳化温度80℃、油水质量比为7∶3、矿化度为95 g/L的条件下,可使超稠油黏度由316.5 Pa·s(50℃)降至其乳状液的0.0831 Pa·s,降黏率达99.97%,50℃下静置4 h的出水率为5.93%。温度对乳化降黏剂降黏性能的影响较小,经200℃处理2 h后超稠油乳状液的降黏率不变。复配乳化剂各组分间发挥了协同增效作用,增强了体系的降黏性能,提高了乳状液的稳定性。乳化降黏剂降黏效果良好,耐温抗盐,适用于高温高盐油藏。图10表3参15。
In view of the high viscosity and poor fluidity of super heavy oil and high salinity of formation water,emulsified viscosity reducer was prepared by surfactant,alkali and organic phosphoric acid and its formula was optimized.The effects of salinity and temperature on the viscosity-reducing properties of viscosity reducer were studied and the mechanism of viscosity reduction was analyzed.The results showed that the optimal formula of emulsifying viscosity reducer for super heavy oil was obtained as follows:1.1∶0.45∶1.15 the mass ratio of compound surfactant consisting of sulfonate anionic surfactant YBH and alcohol ether carboxylate anionic-nonionic surfactant YFBH with a mass ratio of 1∶1,alkali and salt resistant additive NYZJ-1.When the dosage of compound agent and additives was 0.81%in the emulsion,emulsification temperature was 80℃,the mass ratio of oil to water was 7∶3 and the salinity was 95 g/L,the viscosity of super heavy oil reduced from 316.5 Pa·s to 0.0831 Pa·s at 50℃,the viscosity reduction rate was up to 99.97%and the water separating proportion was only 5.93%after standing in 4 hours at 50℃.Temperature had little effect on the viscosity-reducing property of viscosity reducer and the viscosity reduction rate of super heavy oil emulsion remained unchanged after 2 hours treatment at 200℃.The synergetic effect among the components of the compound emulsifier enhanced the viscosity-reducing property of the system and the stability of emulsion.The emulsified viscosity reducer had good viscosity-reducing effect and could withstand temperature and salt,which was suitable for the oil reservoir with high temperature and high salt.
作者
任亚青
吴本芳
REN Yaqing;WU Benfang(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2020年第2期318-324,共7页
Oilfield Chemistry
关键词
超稠油
降黏剂
乳化
降黏
抗盐
耐高温
super heavy oil
viscosity reducer
emulsification
viscosity reduction
salt tolerance
heat resistance
