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Successful Application of MP-ICDA to Assess and Confirm Crude Oil Pipeline Corrosion Threats in Kuwait using ILI

Product Number: 51321-16271-SG
Author: Amer Jaragh/ShabbirSafri/PatrickJ. Teevens/MilesHuynh/TijanPinnock/AshishKhera
Publication Date: 2021
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The paper addresses the application of the NACE International Standard Practice SP0116-2016 for Multiphase Flow –Internal Corrosion Direct Assessment (MP-ICDA), used in-part for the determination of the internal corrosion rate and root-causes for two-30inch diameter (762 mm)crude oil pipelines (CR180 and CR181)operating in the State of Kuwait. The two pipelinesystemswent through operational changes such as the introduction of sour, heavy crude oil from ongoing field development. The fluids in the subject pipelines were previously confirmed to be highly corrosive(as many corrosion coupons) were severely corroded in short-term exposures of 3 –6 months typically and forwhich was quantified in conducting the Indirect Inspection (IDi)or Step2 of the MP-ICDA protocol. After confirming the presence of significant internal corrosion defects from an ILI, a dynamic pitting factor was developed using the predicted water accumulation, solids deposition, and wall loss to better capture the high variability in internal corrosion. Ultimately, the MP-ICDA methodology has correctly provided confirmation of the root-causes and mechanisms actually encountered in the pipeline and to thereby recommend a reliable internal corrosion mitigation strategy.The MP-ICDAprotocolwas successfully used to forecast four theoretical flow scenarios for operations personnelgoing forward to lower the internal corrosion susceptibility of the subject pipelines.

Key words:MP-ICDA, sour service, indirect inspection, in-line inspection, dynamic pitting

The paper addresses the application of the NACE International Standard Practice SP0116-2016 for Multiphase Flow –Internal Corrosion Direct Assessment (MP-ICDA), used in-part for the determination of the internal corrosion rate and root-causes for two-30inch diameter (762 mm)crude oil pipelines (CR180 and CR181)operating in the State of Kuwait. The two pipelinesystemswent through operational changes such as the introduction of sour, heavy crude oil from ongoing field development. The fluids in the subject pipelines were previously confirmed to be highly corrosive(as many corrosion coupons) were severely corroded in short-term exposures of 3 –6 months typically and forwhich was quantified in conducting the Indirect Inspection (IDi)or Step2 of the MP-ICDA protocol. After confirming the presence of significant internal corrosion defects from an ILI, a dynamic pitting factor was developed using the predicted water accumulation, solids deposition, and wall loss to better capture the high variability in internal corrosion. Ultimately, the MP-ICDA methodology has correctly provided confirmation of the root-causes and mechanisms actually encountered in the pipeline and to thereby recommend a reliable internal corrosion mitigation strategy.The MP-ICDAprotocolwas successfully used to forecast four theoretical flow scenarios for operations personnelgoing forward to lower the internal corrosion susceptibility of the subject pipelines.

Key words:MP-ICDA, sour service, indirect inspection, in-line inspection, dynamic pitting

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