Oil Recovery Techniques MEOR CHALLENGE Increasing the recovery of undrained oil in existing reservoirs RECOVERY TECHNIQUES Sofia Castanho, May 2014
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Oil Recovery Techniques MEOR
CHALLENGE
Increasing the recovery of undrained oil
in existing reservoirs
RECOVERY TECHNIQUES
Sofia Castanho, May 2014
Natural storage energy
Waterflooding
Oil Production Processes
Sofia Castanho, May 2014
Microbial Enhanced Oil Recovery (MEOR)
Microorganisms are utilized for the mobilization of crude oil trapped in mature oil formations Indigenous microorganisms are advisable
Reduce interfacial tension between the HC´s and aqueous phase
Improve oil mobility Environmentally harmless
Reduce the viscosity of HC´s by degradation of heavy oil fractions
Sofia Castanho, May 2014
MEOR Workflow
Consortium of
microorganisms
Degradation of
heavy oil fractions
↓ oil viscosity
↑ oil mobility
Enhance Oil
Recovery
Biosurfactant
production
↓ interfacial tension
Sofia Castanho, May 2014
In-Loco Experimental Procedures: Huff & Puff
Sofia Castanho, May 2014
• Injection of nutrients to stimulate indigenous microorganisms replication
MEOR General Strategies
Sofia Castanho, May 2014
MEOR Brazilian Field Assay
Most of the successful MEOR treatments were conducted in formations with:
Low temperature (below 55°C)
Low salinity (less than 100000 ppm)
High water cut (above 75%)
Low production rate
Dead Oil ( 30º API)
Sofia Castanho, May 2014
MEOR Brazilian Lab Assay
Sofia Castanho, May 2014
Microbial products are biodegradable and have low toxicity
Easy application
Reduces production decline & Increases water flood efficiency
Increase Oil Recovery Factor and thus life of the field is extended for years.
Commercially proven, fast and simple application.
Utilizes indigenous microorganisms, environmentally friendly and no harsh chemicals or
additives used.
MEOR Advantages
Glori Energy Report, 2008
Sofia Castanho, May 2014
The oxygen deployed in aerobic MEOR can act as corrosive agent on non-resistant
topside equipment and down-hole piping
Anaerobic MEOR requires large amounts of nutrients limiting its applicability in offshore
platforms due to logistical problems
Exogenous microbes require facilities for their cultivation..
Microbial growth is preferentially applicable when: layer permeability is greater than 50 md;
reservoir temperature is inferior to 80 0C, salinity is below 150 g/L and reservoir depth is
less than 2400m.
MEOR Disadvantages
Sofia Castanho, May 2014
Indigenous microorganisms
are advisable
Growth is rapid
Microbes degrade skin
damage, increasing fluid entry
into the reservoir
Efficiency of recovery is high
Conclusion
Sofia Castanho, May 2014
THANK YOU
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