prevention of mic
TRANSCRIPT
Prevention of MICSubtitel
Prevention of MICA Case Study In Pipelines Transporting Water Condensate
Aleida de Vos van SteenwijkISMOS-2 ,19th June 2009
Overview presentation
I t d ti• Introduction• What is MIC?• Case Study• Case Study
– Aim: reduce risks of SRB growth in pipeline system– ApproachApproach– Results– Intake protocol
• In conclusion
Nederlandse Aardolie Maatschappij
• NAM is the biggest producer of natural gas and oil in the Netherlandsg
• NAM produces 50 billion m³ natural gas a year, of which 27 billion m³ (54%)
f th G i fi ld comes from the Groningen field.
Source: NAM
Bioclear
Bioclear is dedicated to working on biological Bioclear is dedicated to working on biological solutions for soil, energy and the environment
– Founded in 1988Founded in 1988
– Team of 27 people
– Multidisciplinary, e.g. environmental t h l t h l h i t technology, process technology, chemistry, microbiology, biotechnology, ecology, hydrology, environmental sciences
– International
– quality system
Fields of application
• Biological Soil Remediationg• Energy & Environment
• MIC• Space research (ESA)
Mi i• Mining• Horticulture• BiofoulingBiofouling• Biofiltration• Microbial safety and hygiene
Microbiologically Influenced Corrosion
• A complex processes requiring interdisciplinary approachMicrobiology Electrochemistry Metallurgy etcMicrobiology, Electrochemistry, Metallurgy, etc.
• Dynamic processSituation can change rapidly and is unpredictableSituation can change rapidly and is unpredictable
• Limited awarenessDon’t always believe in or understand MIC
• No ‘one solution’ to the problem...
MIC is essentially a Biological Process
• Many bacteria can be involved such as:• Many bacteria can be involved, such as:– Sulphate Reducing Bacteria (SRB)– Sulphur Oxidising Bacteria (SOB)– Iron Reducing Bacteria (IOB)– Iron Reducing Bacteria (IRB)
Bi fil h i fl• Biofilms have a great influence– Change local conditions drastically (aerobic anaerobic)– Keep micro-organisms and metabolites in close proximityKeep micro organisms and metabolites in close proximity
• Micro-organisms can produce corrosive metabolites– Organic and inorganic acids, EPS, etc.g g , ,
Sulphate Reducing Bacteria (SRB)
Case Study
• By-products formed when processing natural gas are y p p g gtransported through pipelines to a treatment facility.
• Transport of these by-products possibly leads to MIC
Aim: Set-up an intake protocol for pipelines to reduce the risks of SRB growthrisks of SRB growth
Approach
• Are micro-organisms relevant to MIC present?
• What are the environmental conditions?• What are the environmental conditions?
• What are growth requirements of SRB?
• Are there risks of increased SRB growth and MIC?
Are relevant micro-organisms present?
Microscopy/FISHFISH
Q-PCR
DGGE
Results
• Microbial analysesy– SRB predominant– Other relevant micro-organisms identified (biofilm, IOB,
IRB t )IRB, etc.)
• Environmental conditions– Most conditions favourable for SRB growth (carbon source,
temperature, oxygen, sulphate availability, salt concentrations etc )concentrations, etc.)
– Except pH: indication that slight differences in pH may lead to increased activity of SRB
How to reduce risks of MIC?
• SRB greatest risk factor– Present throughout system– Conditions mostly favourable
• Impossible to ‘sterilise’ entire pipeline system, so....
• Ensure conditions within pipeline are kept unfavourable for SRB growth reducing risks of MIC
Intake Protocol to minimise SRB growth
A – Most probablyB – ProbablyC – Possible, but unlikelyD – UnlikelyE – Very unlikely
In Conclusion
• Monitoring of pipeline using intake protocol since 2005g p p g p• No internal MIC defects since that time
Furthermore:• Increased awareness of MIC and the possibilities for
di i it i d tidiagnosis, monitoring and prevention
Th k fThank you for your attention!your attention!