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In this paper, the corrosion process of acidizing fluid (10% HCl + 8% HBF4) in the production string was analyzed according to the acidizing procedure of the running pipe column. The amount of corrosion inhibitor, concentration of displacement fluid (NH4Cl) and off-time (H) were investigated via an orthogonal design method to analyze the influence of the inhibition of acid corrosion of the immobile pipe string to confirm the main factors for corrosion of the oil tube. The results demonstrated that the amount of inhibitor was key to avoid corrosion of the immovable string by acidizing fluid. The corrosion and inhibition properties of N80 steel in fresh acid and residual acid solution were studied through electrochemical measurements and immersion tests. In addition, the corrosion morphology of the corrosion product was examined by scanning electron microscopy (SEM). The results showed that the N80 steel was more seriously corroded in the residual acid than in fresh acid. The pipe string also was corroded by the high-concentration acid liquid during acidification flow-back of the immobile pipe string. Therefore, effective measures should be taken to reduce corrosion due to residual acid on the pipe during the initial stage of acidizing flow-back.

Corrosion inhibition of N80 steel simulated in an oil field acidification environment