Prediction of Scale Formation Trend of Injected and Produced Water in Zhaike-Shaoyuanzi Oilfield

Abstract Oil field fouling not only causes pipelines, equipment and oil Wells to be blocked, but also brings certain security risks. In this study, the scale prediction of calcium carbonate, calcium sulfate, barium sulfate andstrontiumsulfatewascarriedouttoclarifythescalingtrendofinjected water and produced water, providing a basis for subsequent oilfield water quality treatment. The results show that: after the injection water is mixed with formation water (produced water), the larger the proportion of produced water, the slower the scaling trend of calcium carbonate; There is no scaling trend for calcium sulfate; Barium sulfate had scaling trend, and the value showed an increasing trend; Strontium sulfate showed a scaling trend and a decreasing trend in value; The mixing experiment results show that the three kinds of scale ions in any proportion of mixed water sample have different degrees of loss, the loss is mainly calcium ion, barium ion second; The prediction results of scaling trend have good correlation with the results of mixing experiment, which can be used to quickly judge the scaling situation after mixing.