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Microbiological Profile and Risk Exposures in Topside Production Systems of FPSOs in West Africa

Microbiological Profiles and Risk Exposures in Topside Production Systems of FPSOs in West Africa
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The incidence and proliferation of microbial population in oil and gas production facilities can have undesirable consequences on upstream, midstream and downstream production systems.  Microbes thrive in the anaerobic conditions encountered in these systems and are supported by nutrients and metabolites found in produced water.  Although the majority of process and water injection systems are susceptible to microbial fouling, the development of microbial activity is exacerbated by specific conditions such as stagnant fluids or the presence of deposits.1 Threats of microbiologically influenced corrosion (MIC) and other challenges associated with microorganisms have become valid as more cases are reported.  While MIC, biofouling (BF), and reservoir souring are three of the most common problems associated with microbes, many other production issues can be attributable to microbial activity including: employee infections, filter plugging, loss of injectivity, and metal sulfide deposits.2

Product Number: 51322-18017-SG
Author: Kingsley Oparaodu, Ibiba Braide
Publication Date: 2022
Industries: Oil and Gas , Corrosion Monitoring and Control , Coatings
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Microbiological risk evaluation of topside systems of four floating production storage and offloading in West Africa was carried out over a period of four years.  Field samples were taken, and DNA analyzed using next-generation sequencing technology to identify and classify the microbial population present on the facilities.  Several classes of bacteria and archaea were sequenced and identified from the samples, including those that have been shown to play key roles in biofouling, microbiologically influenced corrosion and biogenic hydrogen sulphide generation in oil and gas production systems.  The classic microbial population according to metabolic classes associated with oil and gas production systems were identified.  The study found that of the 137 microbial genera identified, 45.3% were associated with biofouling, 29.9% with microbiologically influenced corrosion, 29.1% with a H2S/MIC risk and a 2.9% population did not have a clear link to any of these risks.  There was at least 98% relative abundance of bacteria population in the samples from all FPSOs, implying a significant exposure to the risks posed by microbial growth and proliferation. 

Microbiological risk evaluation of topside systems of four floating production storage and offloading in West Africa was carried out over a period of four years.  Field samples were taken, and DNA analyzed using next-generation sequencing technology to identify and classify the microbial population present on the facilities.  Several classes of bacteria and archaea were sequenced and identified from the samples, including those that have been shown to play key roles in biofouling, microbiologically influenced corrosion and biogenic hydrogen sulphide generation in oil and gas production systems.  The classic microbial population according to metabolic classes associated with oil and gas production systems were identified.  The study found that of the 137 microbial genera identified, 45.3% were associated with biofouling, 29.9% with microbiologically influenced corrosion, 29.1% with a H2S/MIC risk and a 2.9% population did not have a clear link to any of these risks.  There was at least 98% relative abundance of bacteria population in the samples from all FPSOs, implying a significant exposure to the risks posed by microbial growth and proliferation. 

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