CORROSION AND PROTECTION OF STEEL G105 FOR DRILL TOOLS IN SALINE SLURRIES
盐井钻井的盐水泥浆液中钻具的腐蚀与防护研究

Corrosion products on drilling steel G105 surface,which was taken from a drilling well of Jiangsu oil field,were analyzed by EDS.In order to control the corrosion of the drilling well inhibitors were selected through scan potentiodynamic polarization tests in the saline slurries.Inhibition efficiency of the selected inhibitors was assessed by weight-loss method.Results showed the inhibition efficiency above 90% for complex inhibitors.The formed film on the steel induced by inhibitors was also characterized by XPS and the relevant mechanism was discussed.At last,corrosion ring tests were performed in the drilling site,which showed that ideal effects were obtained by using the selected inhibitors.