10093 Progress in the Prediction of Top of the Line Corrosion and Challenges to Predict Corrosion Rates Measured in Gas Pipeline

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Product Number: 51300-10093-SG

ISBN: 10093 2010 CP

Author: Yves Gunaltun, Matina Thammachart, Marc Singer, Srdjan Nesic, Suchada Punpruk and Ussama Kaewpradap

Publication Date: 2010

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Bongkot is an offshore gas field in the Gulf of Thailand in operation since 1992. The sealines have been subjected to top of line corrosion (TLC) since the production start-up. After detection of the first TLC case in this field in 1999, different possibilities were investigated and implemented to reduce the corrosion rate to a reasonable value. Recently few leaks were experienced at cold spots like bare metal surfaces around subsea flanges or anode pads welding. It was clear that stabilisation does not take place at cold spots. TLC prediction for the sealines of different gas fields was necessary for prediction of leaks at such locations. The TOPCORP model was selected for this purpose. As a first step, the capabilities of this model were evaluated using data available from Bongkot field. This paper gives a short review of different prediction models, summarises selected model’s main features, compares the predicted water condensation and corrosion rates to inspection results and discusses the capabilities of the model.

Key words: top of line corrosion, corrosion prediction, CO2 corrosion, modeling