Study On Inhibitors Of Corrosion And Scale For Cycle Water System

This paper contains two parts, preparation for research and experimental evaluation.Based on the investigation of operating state and exchanger replacement at cycle water sites in Daqing oil field natural gas corporation and the analysis of the make up water supply, the research was focused on selection and evaluation of inhibitors of corrosion and scale which will be applied in Daqing.The experimental research was carried out firstly to test inhibition performance of some single inhibitors, such as PBTCA, HPAA, HL-1 and HL-2 under different temperature and inhibitor concentration. In order to collect various valuable properties in one inhibitor, composite inhibitors of ter-copolymer QH-1 and QH-2 were selected to be characterized their inhibition behaviors by static state simulation and/or dynamic simulation. The results can be concluded as followed:The inhibition of corrosion and scale of composite system is stronger than single component which may be due to the synergy existing in composite system.Various quality indexes of QH-1 and QH-2 reach the excellent requirements described in "cold water analysis and test methods" of SINOPEC.