The use of corrosion inhibitors to protect assets from carbon dioxide and hydrogen sulfide induced corrosion has been the most universal method implemented in the oil and gas industry. Imidazoline derived inhibitors have been amongst the most popular and effectively used in sweet and sour environments for several decades. A particular interest emerged around the development of novel additives and low dosage corrosion inhibitors to comply with the properties of the new generation of corrosion inhibitors (nontoxic and green). The performance of the Imidazoline-derived CI in combination with a novel additive was evaluated using Linear Polarization Resistance (LPR), Anodic-Cathodic Polarization (ACP) and Electrochemical Impedance Spectroscopy (EIS). The results showed the synergistic and enhancer effect of the mixture when the novel additive is present in the formulation in low doses. The three methods were performed with a rotating cylinder electrode at high rotation to evaluate the film persistency of the mixture of corrosion inhibitor/novel additive. A high potential was found it in the mixture of Low Dose of Novel Additive chemistry with Imidazoline to mitigate corrosion.
Throughout the oil and gas industry, carbon steel continues to be the material of choice for most downhole production tubulars and pipelines. Given the environment of typical oilfield operations, comprehensive integrity management programs are followed to guard against the threats of internal corrosion and material degradation of such assets. Although there are various corrosion mitigation options available, the application of corrosion inhibitor chemical products is commonplace given their relative ease of use and cost effectiveness. Various companies and institutions continuously research and develop new chemistries, formulations and options to increase the efficacy in inhibiting various corrosion mechanisms.1,2
Corrosion inhibitor products, which comprise organic or inorganic constituents, are chemicals that, after being injected into a corrosive medium in small amounts, typically mitigate corrosion through adsorption onto the metal surface, reducing the anodic and/or cathodic processes and/or retarding the diffusion of reactants to the metal surface.3-5 Since the effectiveness of a chemical additive to perform as a corrosion inhibitor is related to its physicochemical properties, formulating effective corrosion inhibitors for various metals and environments involves blending various chemistries with the desired structures and characteristics.6-8
