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Corrosion is defined as the degradation of a material or its properties due to a reaction with the environment and is one of the most common pipeline integrity threats for operators. External corrosion may be visually inspected during excavation; however, due to accessibility, additional non-destructive examination (NDE) methods must be utilized to identify the presence and severity of internal corrosion.
Understanding the chemistry and electrical properties of how corrosion occurs aids in mitigating the presence of corrosion, specifically internal corrosion.
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Corrosion associated with alternating current (AC) interference on buried steel pipelines. AC corrosion characteristics and proposed mechanisms. Approaches to protection and monitoring.
MIC-causing microorganisms were investigated in a 16” diameter and 9.6 km long injection water pipeline. Nitrate was added to the water and pigging debris from the pipeline showed that both sulfate-reducing bacteria (SRB), nitrate-utilizing bacteria, and methanogens were present in numbers of 105 – 106 cells/g.
Fouling of equipment surfaces by siliceous salts such as silica, metal silicates,coprecipitated silica with mineral salts such as calcium carbonate, calcium sulfate, etc.,is a serious challenge facing the technologists in the efficient operation of industrialsystems. Severe fouling at times results in premature expensive equipment replacement,early shutdown, increase in operating pressure of pumps, and enhance the probability ofcorrosion damage. In many cases, the removal of foulants leads to discontinuousoperation of the system, resulting in higher operating costs. In geothermal applications,siliceous scale typically occurs when brine is cooled in the course of brine handling andenergy extraction.
High voltage direct current (HVDC) transmission results in a large direct current will into the earth. This may cause interference on a buried pipeline even though it is far from the earth electrode. In this work, numerical simulation was used to study the mechanism and influencing factors of HVDC interference.
The Frøy field is in the Norwegian sector of the North Sea and is located in the Jurassic Sleipner andHugin formations at a depth of 2940 – 3176 m true vertical depth subsea. It is made up of a series ofreservoir units (RU), with the main units being RU3 to 5. The reservoir has a porosity of 15 – 23% and apermeability of 15 – 1500 mD.