Study On Heterogeneous Catalytic Ozonation Of The Typical Member And Demulsification Efficiency Of ASP Flooding

Oilfield development regime, which decides the level of oil recovery, especially the appearance of ASP flooding further enhance oil recovery. On the one hand, ASP flooding gets out of the limit of fewer available exploration resources leaded by limited oil resources. On the other hand, it ensures stable yield and increasing production of the existing oil production.However,with the widespread application of ASP flooding, residual alkali, surfactant, polymer and so on in the produced water lead to a series of technical problems such as increasing the oil-water emulsion and the difficulties of oil-water separation, being hard to meet the requirement of water quality standard of the reinjection water and increasing wash frequency of the water injection wells.This paper used heterogeneous catalytic ozonation method to treat ASP flooding sewage.Ozone catalyzed by catalyst generated a high efficient oxidized hydroxyl radical which had high chemical potential and oxidizing capacity. This hydroxyl radical could oxidize organic pollutants non-selectively in order to achieve well demulsification and polyacrylamide removal efficiency. First, in the metal chelates catalyzing ozonation characteristics study,basic theory of the metal chelates catalyzing ozone and its feasibility analysis were created.The metal chelates catalyzing ozonation efficiency was investigated by choosing chelate agent,power factor and optimized ratio of catalyst. Hydraulic retention time and p H value which effected on the metal chelates catalyzing ozonation PAM efficiency were analyzed. The efficiency and kinetics which included the biochemical function and kinetics research were studied in the metal chelates catalyzing ozonation process where the demulsification efficiency for PAM solution and its additional surfactant mixture solution were also investigated respectively.The result shows that, under the condition of 100% power factor and 1:1 ratio of Fe SO4 and EDTA concentration, the PAM and viscosity removal rate can respectively reach 75% and64%, and the efficiency of organic degradation and demulsification works well when HRT is added up to 2.0h. In addition, acid environment is adverse to metal chelates catalyzing ozonation reaction, whereas alkaline environment instead. The B/C rate of PAM solution rises from 0.121 to 0.423 indicating that the biochemical function can be improved after metal chelates catalyzing ozonation. At last, the metal chelates catalyzing ozonation conforms to the second order kinetics reaction whose constant of reaction rate is 2.20×10-4~3.05×10-4L·(mg·min)-1 in PAM solution that the initial concentration is on the range of 50~100 mg/L.