Corrosion and Inhibition Performance Study of Oil Casing Steel in Calcium Chloride Solution

doi:10.11885/j.issn.1674-5086.2015.02.04.04

Abstract

Abstract: In order to know the corrosion resistance of ordinary carbon steel in the regular killing fluid and find a way to control its corrosion condition, weight loss method and electrochemical methods were used to study N80 and P110 steel's corrosion situation and corrosion inhibition ability in 1.35 g/cm³ CaCl₂ solution at standard pressure and different temperatures, high temperature and pressure, and different types of corrosion inhibitor, dosage. The experimental results showed that with increasing temperature the corrosion of N80 and P110 steel is intensified. And at the standard pressure with the temperature range of 60~80℃, the corrosion current density of the ordinary carbon steel raised from 10^-6 A/cm² to 10^-5 A/cm². At 4 MPa with temperature rising from 90℃ to 150℃, the corrosion rate increased an order of magnitude. At 80℃ with the amount of WLD31A 30 mg/L, it improved inhibition efficiency on N80 up to 95.51%, and that on P110 up to 93.11%. Within the range of 60~80℃, elevated temperatures help to improve WLD31A inhibition effect, the inhibition efficiency of N80 increases from 88.08% to 95.51% and P110 from 61.38% to 93.11%.

Key words: oil casing steel, calcium chloride solution, corrosion, inhibitor, well control fluid

CLC Number:

TE39

HUANG Qiuwei, JIAN Lu, LI Guoliang, DU Zonghe, WANG Xu. Corrosion and Inhibition Performance Study of Oil Casing Steel in Calcium Chloride Solution[J]. 西南石油大学学报(自然科学版), 2016, 38(6): 158-163.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.02.04.04

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2016/V38/I6/158

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