针对M油田目的层油藏物性差、非均质强、矿化度高等问题,研究了新型双烷基甘油醚衍生表面活性剂(diGE-EO)的耐温抗盐性能,并利用霍尔曲线对比研究了聚合物和聚合物-表面活性剂二元抗盐体系的注入性能,分析了聚合物-表面活性剂二元抗盐体系提高M油田目的层原油采收率的可行性。研究结果表明:双烷基甘油醚衍生表面活性剂(diGE-EO)在质量浓度高于3 500 mg/L时依然保持较好的抗盐性能,在85 ℃条件下放置超过45 d,仍能使油水界面张力降至5.73×10-3mN/m,处于超低界面张力范围,可满足高矿化度油藏开发的要求。同时分析了聚合物-表面活性剂二元抗盐体系的注入性能。结果表明,当聚合物溶液质量浓度达到1 500 mg/L、岩心渗透率低于200 mD时,单独注入聚合物难度增大;存在表面活性剂情况下,注入性能得到明显改善。该结果为M油田二元复合驱项目方案设计及现场实施提供了室内实验基础。
To address the problems of poor physical properties, high heterogeneity and high salinity of the target reservoir in M Oilfield, the temperature and salt resistance of a new dialkyl glycerol ether-derived surfactant (diGE-EO) was studied in this paper, the injection performance was compared with Hall curve between the polymer and the polymer-surfactant binary salt resistance system, and the feasibility of polymer-surfactant binary displacement system to enhance oil recovery in the target reservoir of Minsk Oilfield was analyzed. The study results show that The diGE-EO can maintain high salt resistance at concentrations higher than 3 500 mg/L, and can reduce the oil-water interfacial tension to 5.73×10-3 mN/m after being placed at 85 ℃ for more than 45 days, which is in the ultra-low interfacial tension range, meeting the requirements for the development of highly mineralized reservoirs. The injection performance of polymer-surfactant binary anti-salt system is also analyzed. The results show that when the mass concentration of polymer solution is up to 1 500 mg/L and the core permeability is lower than 200 mD, and it becomes more difficult to inject polymer alone; in the presence of surfactant, the injection performance is significantly improved. The test results provide a laboratory test basis for the scheme design and field implementation of binary composite flooding project in M oilfield.
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