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This paper addresses the challenges to provide example of engineering solutions through the use of corrosion resistant alloys and non metallic materials to maintain the integrity of flowlines and process equipment in severe sour service.
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A Cr-Mo-B-Ti low alloyed steel, with a special quenched and tempered heat treatment, was designed. Corrosion fatigue resistance of the new material was evaluated at lab scale. Field tests are being carried out in 26 wells where sucker rods had failed for years.
In pipeline corrosion management practice, one challenge is how to locate the most corrosive area along the right-of-way of an existing pipeline. Pipeline networks are complex systems containing different grades of multiphase crude oil coming from dissimilar reservoirs, which results in fluids having dissimilar chemical and physical properties along each network. The fluid starts flowing into a pipeline at a certain pressure, temperature, and associated velocity.
In sour (H2S) corrosion systems, a small amount of H2S can retard the general CO2 corrosion rate of carbon steel by forming a passive iron sulfide (FeS) layer [1], [2]. Environmental factors dictate the formation of protective or partially protective FeS layers on carbon steel surfaces. High H2S levels often result in stable films that reduce the corrosion rate, contingent upon the maintenance of the sulfide layer [2]. Conversely, in slightly sour systems, which initially form mackinawite (FeS) [3], the system has the potential to cause pitting and extremely high localized corrosion rates [2].
Supercritical CO2 storage has been gaining more attention due to its wider application. It is one of the desirable solutions for reducing CO2 emission, which is an important contributor to the global climate crisis. In other cases, some of the early applications were focused on the oil and gas industry, by using supercritical CO2 to sequence the mature wells for better production [1],[2]. In those environments, C1018 carbon steel was extensively used, due to its good balance of toughness, strength, and ductility as well as its excellent weldability.
H2S corrosion mechanisms, specifically at high partial pressures of H2S (pH2S), have not been extensively studied because of experimental difficulties and associated safety issues. The current study was conducted under well-controlled conditions at pH2S of 0.05 and 0.096 MPa.
The main objective was to obtain current-potential relations for iron sulfides which can be taken into a modelling framework, thereby allowing the estimation of the galvanic coupling between carbon steel and iron sulfides under different environmental conditions.
This work will examine and document the conditions that influence the phenomena of H2S generation, and generate quantitative data on the H2S removal performance of the oil soluble fully dispersible transition metal chemistry based H2S scavenger product line.