耐油三元复合泡沫剂筛选及性能评价

发布时间：2018-06-04 19:49

本文选题：耐油低张力泡沫 + 起泡剂　；参考：《东北石油大学》2015年硕士论文

【摘要】：本文开展了耐油三元复合泡沫剂筛选及性能评价的室内实验研究,通过实验优选出适合较高含油饱和度非均质储层调驱的三元复合泡沫体系,在利用泡沫的高视粘度和选择性封堵性能扩大波及体积的同时,通过低张力活性剂的高界面活性提高体系的洗油效率,从而大幅度提高聚驱后非均质储层的原油采收率。首先,采用DFA100动态泡沫分析仪,从10种常用起泡表面活性剂中筛选出含油条件下起泡性能良好、泡沫稳定性强的十二烷基羟丙基磷酸酯甜菜碱(简称起泡甜菜碱)和氟碳101005。通过对比不同表面活性剂的界面扩张模量、剪切模量、界面粘度等参数研究起泡剂性能与界面流变性的关系。其次,将筛选出的耐油起泡剂分别与驱油剂石油磺酸盐、重烷基苯磺酸盐,碱剂NaOH、Na2CO3复配成三元复合体系,通过泡沫性能评价实验和界面张力评价实验筛选出同时具备良好起泡性能和低界面张力的耐油低张力泡沫配方:0.15%起泡甜菜碱+0.15%重烷基苯磺酸盐+1.2%NaOH+1500mg/L聚合物。再次,在人造非均质岩心中进行泡沫体系驱油效果评价,并在不同变异系数、不同含油饱和度下对比分析泡沫体系注入压力、采收率、含水率数据,评价泡沫体系驱油性能。实验结果表明,耐油低张力泡沫体系提高采收率幅度大于20%,且随着变异系数增加,泡沫驱采收率增大,泡沫体系对非均质储层具有很好的适应性;岩心中残余油饱和度在20%-50%范围内,泡沫体系驱油效果理想,体现出良好的耐油性能。最后,通过不同渗透率级差双管并联岩心模型驱油实验,研究泡沫体系渗流能力和驱油效果,得出泡沫体系在渗透率级差小于10:1时驱油效果较好。
[Abstract]:In this paper, laboratory experiments on the screening and performance evaluation of oil resistant ternary composite foams are carried out. The ternary composite foams suitable for high oil saturation heterogeneous reservoirs are selected through experiments. While using the high apparent viscosity of foam and selective plugging performance to expand the sweep volume, the oil washing efficiency of the system was improved through the high interfacial activity of low tension active agent, thus the oil recovery of heterogeneous reservoir after polymer flooding was greatly improved. Firstly, using the DFA100 dynamic foam analyzer, the foaming properties of dodecyl hydroxypropyl phosphate betaine and fluorocarbon 101005, which have good foaming performance and strong foam stability, were selected from 10 kinds of commonly used foaming surfactants. The relationship between the properties of the foaming agent and the interfacial rheology was studied by comparing the interfacial expansion modulus, shear modulus and interfacial viscosity of different surfactants. Secondly, the oil resistant foaming agent was mixed with petroleum sulfonate, heavy alkylbenzene sulfonate and NaOHfN Na 2CO 3, respectively, to form a ternary composite system. Through the foam performance evaluation experiment and the interfacial tension evaluation experiment, the oil-resistant low-tension foam formula: 0.15% betaine 0.15% heavy alkylbenzene sulfonate 1.2%NaOH 1500mg/L polymer with good foaming performance and low interfacial tension was selected. Thirdly, the flooding effect of foam system is evaluated in artificial heterogeneous core, and the injection pressure, oil recovery and water cut data of foam system are analyzed under different variation coefficient and different oil saturation to evaluate the oil displacement performance of foam system. The experimental results show that the oil recovery of oil resistant and low tension foam system is more than 20 percent, and with the increase of coefficient of variation, the oil recovery of foam flooding increases, and the foam system has a good adaptability to heterogeneous reservoirs. In the range of 20%-50% residual oil saturation in the core, the foam system has ideal oil displacement effect and good oil resistance. Finally, through the experiments of different permeability differential two-pipe parallel core model flooding, the percolation ability and oil displacement effect of foam system are studied. It is concluded that the foam system has a better displacement effect when the permeability difference is less than 10:1.
【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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