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针对江汉油田部分注水井注入压力高、注水驱替效率低及套损并不断增加情况,开展了表面活性降低注入井注入压力实验研究,室内进行了表面活性剂体系表面张力、界面张力稳定性能研究,在天然岩心上进行了表面活性剂体系降低驱替压力物理模拟实验及确定现场注入参数实验研究。实验结果表明,研究出的表面活性剂体在试验温度85℃,使用量50PPm条件下油水界面张力达到10mN/m数量级,表面张力≤30mN/m。岩心驱油降压物理模拟实验。后续水驱潜压力下降30%以上。进行了4口井现场试验,两口井见到了表面活性剂降压效果。
In view of the high injection pressure, low waterflooding efficiency and increasing casing damage in some injection wells of Jianghan Oilfield, experiments were carried out to study the effect of surface activity on the injection pressure of injection wells. The surface tension and interfacial tension stability of the surfactant system were studied in laboratory , A physical simulation experiment of reducing displacement displacements of surfactant system on natural cores and the experimental study of determining the site injection parameters were carried out. The experimental results show that the surfactant has the interfacial tension of 10mN / m and the surface tension of less than 30mN / m at the test temperature of 85 ℃ and the dosage of 50PPm. Physical Simulation Experiment of Core Flooding. Subsequent pressure drops water flooding more than 30%. Field trials were conducted in 4 wells, and the two wells saw the antihypertensive effect of the surfactant.