ClO_2改善地层注水效果分析

Analysis of Water Injection Response for Chlorine Dioxide

随着油田后期的开发与建设,特别是聚合物驱油技术的应用,采出液中各种菌类、杂质的含量不断增加,使污水处理难度越来越大。通过利用二氧化氯的强氧化性,杀灭油田污水中的硫酸盐还原菌、腐生菌、铁细菌三大菌类,同时氧化污水中的硫化氢、硫化亚铁等硫化物,并将二氧化氯的作用持续到井口直至地层,进而杀灭和氧化注入井地层中的菌类及硫化物,并抑制菌群的再生,使之达到提高回注污水水质、降低注水压力、改善注水效果的目的。

Sewage treatment difficulty increases with the development and construction in the late oilfield development period, especially for the rising of various bacteria and impurity resulted by polymer flooding. Sulphate redox cell, saprobe and ferrobacteria within the oilfield sewage can be killed with the help of highly oxidizing property of chlorine dioxide. Also, sulphide including hydrogen sulphide and ferrous sulfide may be oxidized, and behavior of chlorine dioxide will last at the well head and formation until both bacteria and sulphide within the injectors could be killed and oxidized or controlled. With the above methods, the target, to improve re-injection sewage quality , decrease water injection pressure and to enhance water flooding response, can be realized.