石油与天然气化工2025，Vol.54Issue(5)：106-114,9.DOI:10.3969/j.issn.1007-3426.2025.05.013
H2S/CO2共存体系下P110S钢缓蚀剂优选及评价
Optimization and evaluation of corrosion inhibitor for P110S steel in H2S/CO2 coexistence system
摘要
Abstract
Objective In the H2S/CO2 coexistence system,corrosion of wellbore tubing will seriously affect the production safety of oil and gas wells,and the injection of efficient and targeted corrosion inhibitors into the wellbore is one of the most effective measures.In this paper,three corrosion inhibitors with good anti-corrosion effects against H2S/CO2 corrosion of wellbore materials are selected to simulate the corrosion behavior of P110S steel in the field.Method The corrosion evaluation of P110S steel was conducted using the weight loss method and surface morphology analysis.The polarization curves were analyzed through electrochemical testing.Additionally,molecular dynamics simulations were employed to calculate the adsorption energy and nucleophilic/electrophilic indices of the inhibitor molecules,along with analyzing the frontier orbital distribution.Result Mannich base-1 demonstrated the best performance in wellbore corrosion prevention,with an inhibition efficiency of up to 86.32%.Electrochemical testing results indicated that Mannich base-1 was a mixed type inhibitor mainly composed of anodes.Molecular dynamics simulation studies have found that all three inhibitor molecules could stably adsorb on the metal surface,among which Mannich base-1,containing a benzene ring and polar functional groups(O,N),adsorbs onto the Fe surface,with its long carbon chain aligning parallel to the Fe surface to form a stable adsorption configuration,which was consistent with the results obtained from the weight loss method.Conclusion Mannich base-1 is the most optimal corrosion inhibitor for this field and can provide effective measures for the wellbore corrosion protection process.关键词
P110S钢/井筒腐蚀/缓蚀剂/失重法/分子动力学模拟Key words
P110S steel/wellbore corrosion/corrosion inhibitor/weightless method/molecular dynamics simulation引用本文复制引用
张敏,宇波,史宝成,朱启星,刘凯..H2S/CO2共存体系下P110S钢缓蚀剂优选及评价[J].石油与天然气化工,2025,54(5):106-114,9.基金项目
国家重点研发计划项目(SQ2024YFE0202171) （SQ2024YFE0202171）
国家自然科学基金面上项目(51974033) （51974033）
国家自然科学基金项目(51306022) （51306022）
油气藏地质及开发工程全国重点实验室项目(PLN2023-11) （PLN2023-11）
水资源工程与调度全国重点实验室项目(武汉大学)(2023SWG10) （武汉大学）
