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针对低渗透油藏注不进、采不出的特点,通过分析残余油饱和度度对注水影响因素,提出了降压增注的思路,研制出适合低渗透油藏的降压增注体系长碳链双亲水基两性表面活性剂,最大可以使注水压力降低63%。优选最佳盐含量范围0mg/L～30000mg/L,使用浓度10%。再此基础上在滨南油田BNB649XN20井进行现场试验,施工后初期日增注40m3,阶段累计注水1068m3,具有良好的推广应用前景。
Based on the analysis of the influence factors of residual oil saturation on waterflooding, the idea of depressurization and replenishment is put forward, and the pressure-reducing and replenishing system suitable for low-permeability reservoirs is developed Carbon chain amphipathic amphoteric surfactant, the maximum can reduce the water pressure 63%. Optimum salt content range 0mg / L ~ 30000mg / L, the use of concentration of 10%. On the basis of this, a field test was carried out in well BNB649XN20 in Binnan Oilfield. After the construction, the initial injection was increased by 40m3 per day, and the cumulative water injection was 1068m3 during the construction phase, which has a good prospect of popularization and application.