Abstract
In order to ensure the bactericidal quality of oilfield reinjected sewage and improve the utilization ratio of oilfield sewage reinjected, the experiment of chlorine dioxide mixed with oilfield sewage was carried out. Two oxygen chlorine disinfectant mixed water flooding was used to produce sewage and polymer flooding sewage, and the characteristics of mixing were analyzed. Ultraviolet radiation, conventional or high concentration bactericides are not durable, the bacterial quantity of injected wellhead is obviously restored, and the field applicability is poor; negative pressure chlorine dioxide bactericidal technology is better than positive pressure method, and its sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria (IB) kill nearly 100%, the cost is the lowest, and the high efficiency is maintained. For a long time, chlorine dioxide is used to sterilize polymer flooding wastewater to clean up dilute or dirty polymer. The solution has high initial viscosity, low viscosity loss and high viscosity retention rate. This study provides technical support for the two utilization of oilfield water drive and polymer flooding wastewater.
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