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Hong, Chuanshi
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Publications (7/7 displayed)
- 2021Characteristics of scales and their impacts on under‐deposit corrosion in an oil production wellcitations
- 2021Microstructural characterization of white etching cracks in bearings after long-term operation in wind turbinescitations
- 2020Deformation mechanisms in meta-stable and nitrogen-stabilized austenitic stainless steel during severe surface deformationcitations
- 2020Deformation mechanisms in meta-stable and nitrogen-stabilized austenitic stainless steel during severe surface deformationcitations
- 2017Non-spherical voids and lattice reorientation patterning in a shock-loaded Al single crystalcitations
- 2017A gradient surface produced by combined electroplating and incremental frictional sliding
- 2014Effects of equal channel angular extrusion on microstructure, strength and ballistic performance of AA5754 plates
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article
Characteristics of scales and their impacts on under‐deposit corrosion in an oil production well
Abstract
This study examined the composition and characteristics of scales formed at different depths in an oil production well, which had developed over years of well operation, workovers, and interventions, by the combined use of optical microscopy, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, transmission electron microscopy, and X‐ray diffraction. The iron‐rich scales consist of several mineral phases, including a dominant portion of akagneite and hibbingite, some barite, silicon dioxide, copper sulfide, and small amounts of iron oxide and calcium carbonate. The scales typically have a layered structure consisting of five to six distinct layers, which impacts steel corrosion processes. The type of corrosion beneath the scale surface was found to be diversified. Pitting morphology corresponding to different stages in the development of scales was observed. The relation between pitting density and the extent of corrosion was analyzed. The effects of environmental factors, including calcium, chlorine, oxygen content, steel microstructure, and multiphase flow, on scale formation and corrosion mechanisms, were discussed. The results provide important insights into the formation of scales and the under‐deposit corrosion processes in the oil production tubes.