COEnhanced Oil Recovery (EOR)

Although COenhanced oil recovery so far has not made a breakthrough on the Norwegian shelf,
CO2 EOR is an important component of U.S. oil production, accounting for nearly 6% of U.S. onshore
oil production amounting to 350,000 barrels a day in the beginning of 2010.

This technique uses CO2, both naturally occurring as well as a by-product of industrial processes, to
increase the production of oil from existing oil fields. While CO2 EOR was already in the beginning of
2010 an important component of today’s oil production, they estimated a great potential to expand
production. An analysis commissioned by the U.S. Department of Energy (DOE) projects potential oil
resources recoverable with CO2 EOR of up to 137 billion barrels, with 67 billion barrels economically
recoverable at a price of $85 a barrel. This represented that time more than three times the current
U.S. proven reserves.

Captured CO2 also has the added environmental benefit of not being released into the atmosphere. After the
completion of EOR activities, the CO2 used in oil recovery is permanently sequestered in the oil formation
thus EOR advancing energy production, energy security, and environmental sustainability.

COinjection offshore NCS

CO2 injection offshore the Norwegian Continental Shelf is focused on storage of CO2 gas, either by
stripping the natural gas to achieve LNG production (Snøhvit), or to meet gas delivery specification for
CO2 (< 2.5 %).

CO2 for EOR purposes is so far not a matter on the NCS.


COEOR using the CSU principle

Straen Energy is currently performing a feasibility study financed by Innovasjon Norge.
The objective of the study is to describe various techniques by using the CSU technology for
carbonized water and pure CO2 (supercritical), and to compare technical and commercial aspects with
traditional compressor technology.

Carbonized water


Supercritical CO2


It’s planned to have a draft report by end of this year (2020).