In the process of development in the oilfield, scale has been produced. Thus laboratory-scale deposition tests have been used to understand scale deposition mechanism. The process, mechanism and the main type of the scale in Asp flooding well of the forth plant of the Daqing oilfield were analyzed. To investigate the concentration change of the ions in the formation water with the injection of the Asp complex liquid and the scaling mechanism in the process of Asp flooding the core dissolution test was carried. Some of the scale samples were characterized by scanning electron microscope (SEM), and the results of the element analysis were investigated.
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