新型磺基甜菜碱二元体系特性评价

发布时间：2018-08-04 11:22

【摘要】：目前,二元复合驱及三元复合驱在国内已进入现场实验阶段,由于三元复合驱技术存在采出液处理困难的难点,损害地层等诸多负面因素没有的良好解决方法,三元复合驱正在面临工业化推广的困难。聚合物表面活性剂二元体系突出体现了体系中无碱的特征,这以“治本”的形式直接有效减少对地层的伤害,并且在现场中的操作性更强,在现在愈加的受到各大油田的欢迎。但不完美之处是,二元复合驱技术体系本身的特性会造成油水间界面张力的升高,在将界面张力达到超低的数量级(10-3mN/m)的技术上遇到困难,驱油效率的提高遭遇瓶颈。而在没有碱参与的条件下,表面活性剂会被大量吸附,造成表面活性剂严重流失,再加上长期以来,表面活性剂受到造价较高的限制,关于表面活性剂的研究开发也随之都集中在新型表面活性剂的开发及适合开采条件配方的优化筛选上。本文依照当下形势,围绕新型的磺基甜菜碱进行界面张力及流动性等评价,并对新型磺基甜菜碱进行吸附性试验以及实验室驱油物理模拟研究。研究表明:在聚合物分子量为700-950万,聚合物浓度为500mg/L至2000 mg/L时和在聚合物分子量为1600-1900万,聚合物浓度为500mg/L,新型磺基甜菜碱二元体系的界面张力能够达到10-4mN/m数量级。新型磺基甜菜碱在二元、三元体系中和一元体系相比吸附量均低。可以有效避免投产时驱油剂的损失,有效保持体系浓度,在一定条件下适用于大庆油田的第三次开采。新型甜菜碱型表面活性剂基本不影响体系的弹性特性。聚合物浓度与聚驱的平稳压差及后续水驱平稳压差成正比,分子量越高,比值越大。同时分子量增加,压差随之相应增加。阻力系数和残余阻力系数与聚合物浓度、聚合物分子量成正比。经过对非均质岩心的实验结果进行的分析,我们认为采用新型磺基甜菜碱表面活性剂为配方中,二元体系与三元弱碱(Na2CO3)体系及三元强碱(NaOH)体系驱油效果相当。
[Abstract]:At present, binary compound flooding and ASP flooding have entered the field experiment stage in our country. Due to the difficulty of producing liquid treatment in ASP flooding technology, there is no good solution for many negative factors, such as formation damage, etc. ASP flooding is facing the difficulty of industrialization. The binary system of polymer surfactants shows the characteristic of no alkali in the system, which reduces the formation damage directly and effectively in the form of "cure the root", and is more maneuverability in the field, which is more and more popular in each oil field now. But the imperfection is that the characteristics of binary composite flooding system itself will cause the increase of interfacial tension between oil and water, and it will be difficult to reach the ultra-low order of magnitude (10-3mN/m) of interfacial tension, and the improvement of oil displacement efficiency will meet the bottleneck. In the absence of alkali, surfactants will be adsorbed in large quantities, resulting in serious loss of surfactants. Moreover, for a long time, surfactants have been limited by higher cost. The research and development of surfactants are also focused on the development of new surfactants and the optimum selection of suitable extraction conditions. According to the present situation, the interfacial tension and fluidity of the new sulfobetaine were evaluated, and the adsorption test and physical simulation of the new sulfobetaine were carried out. The results show that the interfacial tension of the new sulfonbetaine binary system can reach the 10-4mN/m order of magnitude when the molecular weight of the polymer is 7-9.5 million, the concentration of polymer is from 500mg/L to 2000 mg/L, and the molecular weight of the polymer is 1600-19 million, and the concentration of polymer is 500 mg / L. The adsorption capacity of new sulfobetaine in binary and ternary systems is lower than that in monolithic systems. It can effectively avoid the loss of oil displacing agent and keep the concentration of the system effectively. It is suitable for the third production of Yu Daqing oilfield under certain conditions. The new type of betaine surfactant has no effect on the elastic properties of the system. The polymer concentration is directly proportional to the stable pressure difference of polymer flooding and subsequent water flooding, and the higher the molecular weight is, the greater the ratio is. At the same time, the molecular weight increases and the pressure difference increases accordingly. The resistance coefficient and residual resistance coefficient are proportional to polymer concentration and molecular weight. Based on the analysis of the experimental results of heterogeneous cores, we consider that the binary system is equivalent to the ternary weak base (Na2CO3) system and the ternary strong alkali (NaOH) system in the formulation of new sulfobetaine surfactants.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

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