Bacteria are the important factors influencing the injection water quality. Bacte-ria quantity not only cause corrosion sewage pipeline and processing equipment, increase the difficulty of wastewater treatment, and will cause formation plugging. At present, the oily sewage mainly by physical method and adding the chemical fungicides to remove bacteria, application physical sterilization method. Bacteria can not meet the standard requirements, adding the chemical fungicide cost is high, easy to produce drug resistance. Seek economic effective sterilization techniques, to carry out the chlorine dioxide disinfection technology, using sodium chlorate and hydrochloric acid aqueous solution as raw material,chlorine diox-ide automatic dosing, the test results show that the concentration of chlorine dioxide quality for more than 10 mg/L, sulfate reducing bacteria and saprophytic bacteria and iron bacteria sterilization rate close to 100%, sulfur content also decreased significantly, the outbound and injection wellhead bacteria to reach standard, sulfide content up to standard, which reduces the cost of sterilization,experimental zone of sterilization cost reduced by 76.7% each year.%回注水中的细菌是影响注入水质的重要因素。细菌超标不仅对污水管道及处理设备产生腐蚀，增加污水处理难度，而且还会造成地层堵塞等危害。目前油田含油污水主要采用物理方式和投加化学杀菌剂方式去除细菌，单纯采用物理杀菌方式难以达到污水回注指标要求，而投加化学杀菌剂运行成本高，且长期投加细菌会产生抗药性。为寻求经济有效的杀菌技术，开展了二氧化氯杀菌技术室内实验和现场试验。现场采用氯酸钠和盐酸溶液为反应原料，所产生的二氧化氯和氯气自动投加到含油污水中。试验结果表明，当回注水中投加二氧化氯浓度为10 mg/L以上时，硫酸盐还原菌、腐生菌和铁细菌的灭菌率接近100%，硫化物含量也明显减少，出站及注水井井口细菌及硫化物含量均达到污水回注指标要求，同时大幅降低了杀菌成本，试验区综合杀菌费用年降低76.7%。
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