The Application of the New Stabilizer in Treating the Viscosity Loss of Sewage Polymer Solution

摘要

The using of sewage to confecting polymer solution is the inevitable choice of oilfield development and environmental protection, as Daqing oilfield produced a lot of sewage. With the increase of quantity of bacteria and population. We did experiment in the laboratory and analysised the mechanism of the new stabilizer. The results show that the new stabilize can effectively inhibit the growth of bacteria in sewage. The main mechanism is the complexation, antibacterial effect, and inhibition of carbon and oxygen free radical of the stabilizer. With the industrialization scale of polymer flooding expanding continuously, fresh water resources become increasingly tense and produced sewage is short of economic and effective treatment method, which brings great pressure on oil production and environmental protection. Therefore, the preparation process of compounding with clean water and diluting with sewage is used in the polymer flooding industrial area. The sewage used to diluting has high salinity, which contains a lot of bacteria, sulfate reducing bacteria, saprophytic bacteria, and iron bacteria. Fe~(2+) and S~(2-), the decomposition products of bacteria, produce oxygen free radicals when combined with O~2. The oxygen free radicals lead to the degradation of the polymer and the decrease of viscosity. In order to solve the problem of viscosity loss during the compounding and injecting process, we carried out laboratory evaluation experiment and field test of the new polymer viscosity stabilizer, which has achieved remarkable results.