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51313-02748-Observations About Bacteria Proliferation and Corrosion Damage Morphology in Kuwait Oilfield Water

Product Number: 51313-02748-SG
ISBN: 02748 2013 CP
Author: Moavin Islam
Publication Date: 2013
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It is well known that certain types of bacteria can cause microbiologically influenced corrosion (MIC) failures in pipelines and process equipment particularly in the oil and gas industry. A number of different types of bacteria strains have been implicated in the MIC process. Of these the SRB (Sulphate Reducing Bacteria) strain are the best known and were the first to be implicated in the MIC process. The morphology of corrosion damage associated with SRB is often characterized by deep terraced pits.

Strong evidence of planktonic and sessile bacterial proliferation consisting of SRB GAnB (General Anaerobic Bacteria) and GAB (General Aerobic Bacteria) in brackish water and effluent water systems in various Kuwait Oil Company (KOC) facilities have been gathered during routine fluid sampling and corrosion monitoring services conducted over the last several years. Severe MIC attack on coupons have been observed and some equipment failures due to MIC have also been encountered. The corrosion morphology observed is typical of SRB attack.

Effluent waters in some KOC facilities are very high in total dissolved solids (TDS) content exceeding 200000 ppm and SRB counts in such waters have been found to be very low. However the GAnB counts are high. Severe corrosion on coupon samples have been encountered in these high TDS waters and the corrosion morphology is very similar to SRB induced attack even though no SRB is present. The present papers discusses these unique observations.

Key words: Microbiologically Influenced Corrosion (MIC) Corrosion Morphology SRB GAnB
 

It is well known that certain types of bacteria can cause microbiologically influenced corrosion (MIC) failures in pipelines and process equipment particularly in the oil and gas industry. A number of different types of bacteria strains have been implicated in the MIC process. Of these the SRB (Sulphate Reducing Bacteria) strain are the best known and were the first to be implicated in the MIC process. The morphology of corrosion damage associated with SRB is often characterized by deep terraced pits.

Strong evidence of planktonic and sessile bacterial proliferation consisting of SRB GAnB (General Anaerobic Bacteria) and GAB (General Aerobic Bacteria) in brackish water and effluent water systems in various Kuwait Oil Company (KOC) facilities have been gathered during routine fluid sampling and corrosion monitoring services conducted over the last several years. Severe MIC attack on coupons have been observed and some equipment failures due to MIC have also been encountered. The corrosion morphology observed is typical of SRB attack.

Effluent waters in some KOC facilities are very high in total dissolved solids (TDS) content exceeding 200000 ppm and SRB counts in such waters have been found to be very low. However the GAnB counts are high. Severe corrosion on coupon samples have been encountered in these high TDS waters and the corrosion morphology is very similar to SRB induced attack even though no SRB is present. The present papers discusses these unique observations.

Key words: Microbiologically Influenced Corrosion (MIC) Corrosion Morphology SRB GAnB
 

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