Study on the viscosity reduction experiment of stimulation wastewater in oilfield

The stimulation wastewater is a kind of re-discharge wastewater produced by various operational measures according to the production needs, it has high viscosity and is difficult to treat. Based on the analysis of the viscosity characteristics of stimulation wastewater, the viscosity reduction experiments were carried out to evaluate the viscosity reduction effects of two measures. The experimental results show that the natural static viscosity reduction is easy and does not need to consume treatment agent. In the rapid viscosity reduction method, the organic structure can be destroyed by adjusting the pH value or adding oxidizing substances to meet the requirements of viscosity reduction. Among them, ozone has the advantages of fast viscosity reduction, good effect, appropriate amount of hydrogen peroxide, which can strengthen the viscosity reduction in wastewater and shorten the time of natural viscosity reduction. In summary, if enough time is available, static viscosity reduction is the appropriate method; if conditions are not available, natural static viscosity reduction and oxidative viscosity reduction are combined. Hydrogen peroxide is the preferred fast viscosity reducer, which can ensure the effect of viscosity reduction.