Corrosion performance of L80, L80Cr1% and L80Cr3% steel grades in simulant solution with carbon dioxide and scaling
- Authors
- Lozada Tip?n, Luis Carlos
- Format
- MasterThesis
- Status
- publishedVersion
- Description
CO2 corrosion is a serious problem associated with the extraction of oil. The presence of CO2 in well fluids could lead to sweet general corrosion where the use of L80 carbon steel as production tubing is common. However, L80 is not resistant enough to mild sweet environments creating a niche which is covered by variations of L80 steel grade such as L80CR1 and L80Cr3. In this paper, polarisation sweep and lineal polarisation resistance electrochemical methods are used to evaluate the corrosion behaviour of three steels (L80, L80Cr1 and L80Cr3) in two different solutions saturated with CO2. Surface analysis scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) are used to characterise the topography and identify the corrosion products. The results show that the corrosion performance of L80Cr3, L80Cr1% and L80 are remarkably diferent at the beginning of the buble experiment where the metallurgic factors play the most important role to endure corrosion. However, when the corrosion film is formed the corrosion rate of the three steels under study are in the same range level. For L80Cr3 the corrosion layer was more adherent, compact and uniform than the other layers formed on the L80 and L80Cr1 metal surfaces. Finally, the SEM-EDX and XRD analyses displayed the presence of siderite for the three steels under study. Additionally, the L80Cr3 corrosion layer contained chromium layer species which could not be defined by the XRD due to the roughness of the sample surface.
- Publication Year
- 2015
- Language
- eng
- Topic
- ELECTROQU?MICA
MECANISMO DE CORROSI?N
CORROSI?N DULCE
METALURGIA
POZOS PETROLEROS
TUBING
- Repository
- Repositorio SENESCYT
- Rights
- openAccess
- License