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Novel Hybrid Model For Under Deposit Corrosion Risk Assessment Of Crude Pipeline In Sand Producing Field

Picture for Novel Hybrid Model For Under Deposit Corrosion Risk Assessment Of Crude Pipeline In Sand Producing Field
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Pipeline under, solids deposition deposit corrosion (UDC) is a localized corrosion phenomenon that develops beneath or around solid deposits, which settle at the bottom of low flow/intermittent flow pipelines. These deposits are complex mixtures of water, organic, inorganic, and biological materials, and their composition can vary significantly depending on the properties of the product being transported and the operating conditions in the pipeline.

Product Number: 51322-17744-SG
Author: Lay Seong Teh, Faisal M. Al-Abbas, Nayef M. Al-Anazi, Qasim Saleem
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00

Oil and gas production pipelines are susceptible to internal corrosion at locations where flow conditions promote water accumulation and solid particles settlement (precipitation). These deposits form diffusion barrier between the produced fluids and under lying substrate, which results in water chemistry near the steel surface different from that in the bulk fluids. This can potentially lead to an accelerated localized corrosion through under deposit corrosion (UDC). Successful corrosion management of UDC i s based on risk assessment, mitigation and monitoring. As a normal practice, mechanical scraping along with chemical treatment is commonly applied as the mitigation for UDC. However, for this case, installing a scraper facility was not economically viable for new pipelines connected to an ageing platform that was meant for temporary period. Therefore, an assessment was conducted to determine if solids deposition and associated corrosion risks could be completely eliminated or tolerated to an acceptable leve l for safe continuous operation before diverting the pipelines permanently and equipped with scraping facility. The assessment utilized a novel approach consisting of advanced precipitation modelling, UDC laboratory testing including solids characterizatio n in addition to flow assurance and corrosion simulation. The results showed that the overall deposition and associated corrosion risk is low. By implementing the recommended measures, these pipelines can be operated safely without scraping facilities temp orarily, after which the pipelines will be routed to future scraping facility

Oil and gas production pipelines are susceptible to internal corrosion at locations where flow conditions promote water accumulation and solid particles settlement (precipitation). These deposits form diffusion barrier between the produced fluids and under lying substrate, which results in water chemistry near the steel surface different from that in the bulk fluids. This can potentially lead to an accelerated localized corrosion through under deposit corrosion (UDC). Successful corrosion management of UDC i s based on risk assessment, mitigation and monitoring. As a normal practice, mechanical scraping along with chemical treatment is commonly applied as the mitigation for UDC. However, for this case, installing a scraper facility was not economically viable for new pipelines connected to an ageing platform that was meant for temporary period. Therefore, an assessment was conducted to determine if solids deposition and associated corrosion risks could be completely eliminated or tolerated to an acceptable leve l for safe continuous operation before diverting the pipelines permanently and equipped with scraping facility. The assessment utilized a novel approach consisting of advanced precipitation modelling, UDC laboratory testing including solids characterizatio n in addition to flow assurance and corrosion simulation. The results showed that the overall deposition and associated corrosion risk is low. By implementing the recommended measures, these pipelines can be operated safely without scraping facilities temp orarily, after which the pipelines will be routed to future scraping facility

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