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09356 Corrosion Management of the Karachaganak Gas/Condensate Field

Picture for 09356 Corrosion Management of the Karachaganak Gas/Condensate Field
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Product Number: 51300-09356-SG
ISBN: 09356 2009 CP
Author: John M. Graham and Philip A. Attwood
Publication Date: 2009
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The Phase II development of the Karachaganak Gas/Condensate field commenced production in 2004. The Karachaganak production fluids are characterised by historically low water cuts, relatively high levels of CO2 and H2S with a ratio close to 1 and a condensate API gravity of between 45 and 50. In general, corrosion rates for the main production and processing facilities have been very low and these low rates of corrosion are attributed to the formation of a thin and tightly adherent film of iron sulfide. From a review of the potential corrosion mechanisms that could occur in such systems where the CO2/H2S ratio is close to parity, it has been possible to implement a targeted inspection programme at areas where sulfide film breakdown could occur. The results obtained from a structured approach to integrity management will be discussed and areas where corrosion has been successfully detected will be described.

Keywords: CO2 corrosion, hydrogen sulfide, risk based inspection, well tubing, inhibition
The Phase II development of the Karachaganak Gas/Condensate field commenced production in 2004. The Karachaganak production fluids are characterised by historically low water cuts, relatively high levels of CO2 and H2S with a ratio close to 1 and a condensate API gravity of between 45 and 50. In general, corrosion rates for the main production and processing facilities have been very low and these low rates of corrosion are attributed to the formation of a thin and tightly adherent film of iron sulfide. From a review of the potential corrosion mechanisms that could occur in such systems where the CO2/H2S ratio is close to parity, it has been possible to implement a targeted inspection programme at areas where sulfide film breakdown could occur. The results obtained from a structured approach to integrity management will be discussed and areas where corrosion has been successfully detected will be described.

Keywords: CO2 corrosion, hydrogen sulfide, risk based inspection, well tubing, inhibition
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