Abstract: The re⁃injection block containing the sewage in the Xing 13 area is affected by the residual polymer,which leads to a decrease in the water absorption effect of the block and affects the development effect of the oil field. Therefore,the formulation and supporting process parameters of the depressurization and infusion injection of the sewage⁃containing block were studied.Firstly,the total water quality of injected water was analyzed; Then the petroleum sulfonate was used as the basic agent to screen the compounding agent and additives by measuring the interfacial tension;After the performance evaluation of the system, the indoor core flooding experiment was carried out to optimize the injection parameter.The results show that the optimal formulation of the anti⁃hypertensive surfactant is(mass fraction):0.7% petroleum sulfonate+2.0% HABS+0.5% absolute ethanol+1.0% NaCl,and the interfacial tension between the crude oil and the interfacial tension is 6×10-3 mN/m.In the core flooding experiment,the optimal injection rate is 0.15 mL/min,the optimal injection volume is 1 PV,and the optimal slug combination is 0.5 PV+0.3 PV+0.2 PV. Under different permeability conditions,the pressure rate is more than 24%.

Key words: Xingnan oilfield, Step?down injection, Sewage containing polymer, Petroleum sulfonate

摘要： 杏十三区含聚污水回注区块受残余聚合物影响，导致区块吸水效果下降，影响油田开发效果。因此，开展了含聚污水区块降压增注表面活性剂配方及配套工艺参数研究。首先对注入水进行了全水质分析；以石油磺酸盐为基础药剂，通过测量界面张力进行复配药剂及添加剂的筛选；对体系进行性能评价后，开展了室内岩心驱替实验，从而优化了注入参数。结果表明，降压增注表面活性剂的最佳配方（质量分数）为：0.7%石油磺酸盐+2.0%重烷基苯磺酸盐+0.5%无水乙醇+1.0%NaCl，与原油之间的界面张力为6×10-3 mN/m；在岩心驱替实验中，最佳注入速度为0.15 mL/min，最佳注入量为1 PV，最优段塞组合为0.5 PV+0.3 PV+0.2 PV，在不同渗透率的条件下，降压率均超过24%。

关键词: 杏南油田, 　降压增注, 　含聚污水, 　石油磺酸盐