| In the process of oilfield water injection, if the injection water quality is not up to standard, it may cause serious harm to oil Wells and the reservoir. In order to ensure the main water pipe safe and economic operation, aiming at the present stage of daqing oilfield produced water quality after wastewater treatment, to carry out the test research on sewage secondary pollution.Firstly, to carry out the washing test at the scene of large displacement and the field test experience combined with oil field industry quality standards, for water injection water quality, I develop a set of suitable for laboratory operation procedures in detail. We use the analysis of experimental operation was carried out on the water quality test.Secondly, the numerical simulation method of qualitative analysis of the wall of the pipe flushing time sand concentration, wall wash effect of oil and suspended solids concentration, at the same time, I qualitative analysis the influence of water injection speed on the concentration of oil, SS and summarize and get their interconnections.Then, I adopt the method of mathematical statistics and quantitative analysis of the wash time, length, velocity and the correlation between the quality of injection water. I set up a water quality changes and the function relation between the main influencing factors and on this basis to determine the reasonable water injection main flushing parameters.Finally, for the different length of pipeline before and after two years on the same sampling mouth rinse effect of selected samples were analyzed. Because of the main pollutants are mainly oil and suspended solids, so I can add demulsifier in main flushing water and auxiliary agent processing such as fungicide and it helps to improve the effect of main flushing. And according to the field measurement of water quality index and use the function relation between them, then it works out, if you want to make the oil content in meeting the requirements of the oil field industry standard requires at least 2.87 hours, if you want to make the suspended solids content to oil field industry standards at least 5.59 hours. |
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