The use of ASP (alkali–surfactant–polymer) slug could be affected by the use of high hardness water, especially when injecting an alkaline agent (Na₂CO₃). The injection water quality of the TFT field is not adequate for cEOR (chemical enhanced oil recovery), because it contains a high hardness rate up to 160°f (report DC R&D 2019). With a TDS rate varying between 4 and 6 g/l, it could cause a formation of insoluble complexes with alkaline agents, and on the other hand, the decrease in the performances of the injected surfactants and polymers. In this work, a simulation study was carried out in order to identify the most adequate treatment process between NF (nanofiltration) and RO (reverse osmoses). The performance of the 4040 type membrane modules has been tested under different operating conditions of temperature and feed pressure (25°–45°) and (3.1–22 bar), respectively. Several membrane configurations (6:0, 4:2) have been tested to determine their effect on the process’ performance. The results showed that the NF90 4040 presents the best performances toward the requirements of the cEOR. Furthermore, the membrane configuration effects the quality of permeate and recovery rate. The results showed a rejection rate of 90% and 95%, respectively, for the total hardness (Ca²⁺ and Mg²⁺) and the sulfate.

ASP（碱-表面活性剂-聚合物）段塞的使用可能会受到使用高硬度水的影响，尤其是在注入碱性试剂（Na ₂ CO ₃）。TFT 油田的注入水质量不足以用于 cEOR（化学提高采油率），因为它含有高达 160°f 的高硬度率（DC R&D 2019 报告）。TDS 比率在 4 到 6 g/l 之间变化时，可能会导致与碱性试剂形成不溶性复合物，另一方面，会降低注入的表面活性剂和聚合物的性能。在这项工作中，进行了一项模拟研究，以确定 NF（纳滤）和 RO（反渗透）之间最合适的处理工艺。4040 型膜组件的性能分别在温度和进料压力（25°–45°）和（3.1–22 bar）的不同操作条件下进行了测试。已经测试了几种膜配置（6:0、4:2）以确定它们对过程性能的影响。结果表明，NF90 4040 表现出对 cEOR 要求的最佳性能。此外，膜配置影响渗透质量和回收率。结果表明，总硬度 (Ca) 的废品率分别为 90% 和 95%²⁺和 Mg ²⁺ ) 和硫酸盐。