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Why Chemical Enhanced Oil Recovery?Why do we need Chemical EOR: some insights
Need for Enhanced Oil Recovery
2 By: Alexey Andrianov, PhD
Despite periods of uncertainty and fluctuating oil prices, world’s oil demand is growing, on average by 2% per year.
On average 65% of oil in place (OIP) remain in reservoir after primary and secondary recovery. The range of remaining oil in oil fields can be from 40 to 95%.
Petroleum industry has a choice in unlocking these giant reserves –either by drilling more wells (not always possible) or using Enhanced Oil Recovery (EOR).
Estimates indicate that global EOR target oil in the world's currently producing fields and expected future discoveries, is well over 5,000 billion barrels.
Figure: Target for EOR,courtesy of Nalco Champion
What is Enhanced Oil Recovery?
3 By: Alexey Andrianov, PhD
Stages of oil production from reservoir:1. Primary recovery• Natural depletion• Artificial lift2. Secondary recovery• Waterflooding• Pressure maintenance3. Tertiary recovery – EOR• Thermal methods• Gas injection• Chemical injection• Other methodsSecondary and tertiary recovery are often grouped into IOR (Improved Oil Recovery)
Figure: Oil production classification,courtesy National Academies Press
inje
cto
r
pro
ducer
How EOR works
4 By: Alexey Andrianov, PhD
Figure: areal sweep
Enhanced Oil Recovery methods act by modifying some physical or chemical properties of fluids-rock system improving
• Macroscopic (vertical/areal) sweep efficiency or• Microscopic displacement or• Both
This increases recovery factor and oil reserves.Successfully designed and implemented EOR can bring from 5 to 30% of OIP as incremental oil production.
oilwater
~ 10-4 m
injector
producer
Figure: microscopic displacement
sand
grain
Figure: vertical sweep
What is Chemical Enhanced Oil Recovery?
5 By: Alexey Andrianov, PhD
Figure: Chemical EOR,courtesy of SPE
• Chemical EOR or chemical flooding is the process where
one or more of previously selected chemicals are mixed
with water and injected into oil reservoir.
• Main objective is to increase oil recovery factor beyond
waterflood levels.
• Most often, chemical flooding means use of surfactants
and/or polymers. Alkaline can be added to their
mixture.
• Sometimes, foam EOR and low-salinity water flooding
are classified as chemical EOR.
• Figure here demonstrate a graphical example of
chemical flooding where both surfactant and polymer
are used.
Targets and fundamental principles of EOR
6 By: Alexey Andrianov, PhD
EOR and specifically CEOR may improve:• Macroscopic displacement efficiency• Microscopic displacement efficiency• Water-oil or gas-oil interfacial tension• Viscosity of water, oil or gas• Alter wettability• Change relative permeability• Reduce water cut or water-oil ratioIn essence, EOR changes fluids-rock system modifying one of two parameters:• Mobility ratio• Capillary number
Fundamental principles of CEOR (and first-level screening):
Lower mobility ratio ▬► Enhance macroscopic displacement ▬► Use Polymers
Increase capillary number ▬► Enhance microscopic displacement ▬► Use Surfactants
PhD (2005) Appl.Math &Hydrodynamics, TU DelftMSc (1999) Appl.Math
Worked on 10+ CEOR projects~20 journal papers~30 conference papers
Alexey AndrianovEOR AdvisorAge: 39Lives in: Russia & Holland
Course Instructor
By: Alexey Andrianov, PhD7
IOR-EOR ConsultantAIA Consulting, The Netherlands 2016 –
Innovations Director, BDMTerratec Global, Russia 2016 –
EOR Technical AdvisorENI, Italy 2014 – 2015
IOR-EOR Chief ScientistENI, Italy 2013 – 2014
Senior Reservoir EngineerShell, The Netherlands 2012 – 2013
EOR Reservoir EngineerPDO, Oman 2011 – 2012
Reservoir EngineerShell, The Netherlands 2006 – 2011
EmploymentPersonal Skills and Interests
Chemical EOR Gas Injection
Waterflood Foam EOR
Waterflood Optimization Well Stimulation
Reservoir Modeling Experiments
Technologies Deployment Novel Solutions
Production Data Analysis Risk Management
Teaching & Mentoring Operations Planning
& CEOR language
tapered polymer
slug
polymer
mobility control
ASP
release oil
Oil Bank
water drive
Course Outline
By: Alexey Andrianov, PhD8
Introduction to CEOR
1
Polymer Flooding
2
Polymer Flooding
3
Surfactant EOR
4
Surfactant EORLow-salinity flooding
5
Foam EORCEOR Implementation
6
Further Reading
Exercises
Enjoy the course
9 By: Alexey Andrianov, PhD
We hope you will choose to take Chemical EOR Course by Dr. Alexey Andrianov brought to you by Avada Oil and Gas.
You can always visit our website http://avadaog.com, send us any questions or queries at http://avadaog.com/contact-avada-oil-and-gas/
We wish you interesting and very fruitful study and hope that very soon your company and petroleum industry will get new skilled Chemical EOR specialist!
Enjoy the course!
