Advanced once-through flow cell methodology for evaluation of a new staged inhibition concept to mitigate corrosion of carbon steel in high-strength hydrochloric acid flow. (November 2022)

• Record Type: Journal Article
• Authors: Owen, Joshua; Neville, Anne; Barmatov, Evgeny; Hughes, Trevor; Barker, Richard
• Is Part Of: Corrosion science. Volume 208(2022)
• Publication Date: 2022-11
• Subjects: Carbon steel -- Acid corrosion inhibitor -- Acid corrosion -- Flow cell -- Electrochemistry; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110676
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: A new staged acid corrosion inhibition (ACI) concept, utilising polymerisable ACIs, has been developed to minimise the corrosion of coiled tubing and wellbore casing materials during matrix acidizing operations. The concept has been evaluated using a customised once-through flow cell and 4 molar hydrochloric acid at 80 °C. A high quality, protective inhibitor film is established using an elevated ACI concentration during the test period 0–1 h (Stage 1), followed by a significantly reduced ACI concentration during the period 1–4 h (Stage 2). This approach is able to maintain good film persistency and acceptably low corrosion rates. Highlights: Staged acid corrosion inhibition concept investigated in 4 M HCl flow at 80 °C. Once-through flow cell used for electrochemical analysis of carbon steel corrosion. Protective film formed in high inhibitor dosage film forming 1 h stage (Stage 1). Using 1/20th of the Stage 1 dosage, the film can be maintained for following 3 h. Effects of a pre-corrosion step to understand influence on inhibition investigated.