One of the main challenges in oil and gas wells is ensuring wellbore and casing integrity in a CO₂ saturated brine environment. The integrity of a well casing relies on its mechanical properties and corrosion resistance to harsh downhole conditions. This paper discloses the results of a mathematical modeling study and experimental investigation conducted to understand the corrosion behavior of carbon steel (AISI 1045 Medium Carbon steel) in CO₂ saturated brine.

Corrosion experiments were carried out at 0.83 MPa varying temperature and CO₂ partial pressure (CPP). To prepare test fluid, 1 wt % NaCl was added to deionized water and thoroughly mixed. The Weight loss (WL) and Linear polarization resistance (LPR) techniques were employed for investigating corrosion. A comprehensive corrosion model is formulated to predict corrosion in a CO₂ environment containing high-salt concentration.

Results indicate a strong impact of temperature on CO₂ corrosion in brine environment. At low CPPs (P_CO2 ≤ 0.41 MPa), the pick corrosion rate was noted at 43 °C. Furthermore, the influence of NaCl content on corrosion was strongly affected by CO₂ concentration. The model is predominantly in agreement with existing corrosion measurements and it predicts the inhibiting effect of salt in CO₂ corrosion.

油气井的主要挑战之一是确保在CO ₂饱和盐水环境中的井筒和套管完整性。井筒的完整性取决于其机械性能和对恶劣井下条件的耐腐蚀性。本文公开了数学模型研究和实验研究的结果，以了解碳钢（AISI 1045中碳钢）在CO ₂饱和盐水中的腐蚀行为。

腐蚀实验是在0.83 MPa的变化温度和CO ₂分压（CPP）下进行的。为了制备测试流体，将1重量％的NaCl加入去离子水中并充分混合。重量损失（WL）和线性极化电阻（LPR）技术用于研究腐蚀。建立了全面的腐蚀模型以预测在高盐浓度的CO ₂环境中的腐蚀。

结果表明温度对盐水环境中CO ₂腐蚀的强烈影响。在低的CPP（P _CO2  ≤0.41兆帕），拾取腐蚀速率在43℃指出。此外，NaCl含量对腐蚀的影响受CO ₂浓度的强烈影响。该模型主要与现有的腐蚀测量结果一致，并且可以预测盐对CO ₂腐蚀的抑制作用。