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51316-7165-Investigation of Under Deposit Corrosion (UDC) in Halfdan Production Tubulars

Based on tubulars retrieved from Halfdan producing wells with low CO2 and H2S content an under deposit corrosion mechanism has been suggested involving multiple parameters including scale buildup microbiologically influenced corrosion (MIC) and the formation of green rust.

Product Number: 51316-7165-SG
ISBN: 7165 2016 CP
Author: Asbjorn Andersen
Publication Date: 2016
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$20.00
$20.00

Based on tubulars retrieved from Halfdan producing wells with low CO2 and H2S content an under deposit corrosion mechanism has been suggested involving multiple parameters including scale buildup microbiologically influenced corrosion (MIC) and the formation of green rust.Laboratory experiments were conducted with the aim to propose a predictive tool that may be used to establish the risk of corrosion in Halfdan production tubulars. A simplified laboratory test design was developed to evaluate the influence of different chemical parameters including gas composition general water chemistry and temperature to simulate downhole conditions.Initially experiments with the simplified test design have shown that it is possible to simulate conditions where scales formed on weight loss coupons develop a structure with good resemblance to scales found in production tubulars in the Halfdan field. Results from weight loss coupons and electrical resistance (ER) probes showed that temperature plays an important role in the morphology of scales formed under comparable chemical conditions. Consequently changes in temperature play a role in the likelihood of initiating localized corrosion.Laboratory experiments field data and mechanistic understandings suggest a predictive tool to evaluate the risk of corrosion may be proposed based on known parameters and experimental results.

Key words: downloadable, Danish Sector, North Sea, Halfdan, Microbiologically Influenced Corrosion, green rust, under deposit corrosion, predictive corrosion risk tool

Based on tubulars retrieved from Halfdan producing wells with low CO2 and H2S content an under deposit corrosion mechanism has been suggested involving multiple parameters including scale buildup microbiologically influenced corrosion (MIC) and the formation of green rust.Laboratory experiments were conducted with the aim to propose a predictive tool that may be used to establish the risk of corrosion in Halfdan production tubulars. A simplified laboratory test design was developed to evaluate the influence of different chemical parameters including gas composition general water chemistry and temperature to simulate downhole conditions.Initially experiments with the simplified test design have shown that it is possible to simulate conditions where scales formed on weight loss coupons develop a structure with good resemblance to scales found in production tubulars in the Halfdan field. Results from weight loss coupons and electrical resistance (ER) probes showed that temperature plays an important role in the morphology of scales formed under comparable chemical conditions. Consequently changes in temperature play a role in the likelihood of initiating localized corrosion.Laboratory experiments field data and mechanistic understandings suggest a predictive tool to evaluate the risk of corrosion may be proposed based on known parameters and experimental results.

Key words: downloadable, Danish Sector, North Sea, Halfdan, Microbiologically Influenced Corrosion, green rust, under deposit corrosion, predictive corrosion risk tool

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