Operators

Enhanced Oil Recovery

byEnverus
October 27, 2025

Enhanced Oil Recovery

Enhanced oil recovery (EOR) refers to a set of techniques used to increase the amount of crude oil that can be extracted from an oil field beyond what is recoverable through primary and secondary methods. EOR methods include thermal recovery, gas injection and chemical flooding, each designed to alter the properties of the reservoir or the oil itself to improve flow and extraction efficiency.
Enverus Intelligence® Research Press Release - Canada’s Montney and Duverney: North America’s most abundant unconventional resource plays

Frequently Asked Questions

What are the main types of EOR techniques?

The three primary EOR methods are thermal recovery (e.g., steam injection), gas injection (e.g., CO₂ or nitrogen) and chemical flooding (e.g., polymers or surfactants). Each technique targets different reservoir conditions and oil types, with CO₂ injection gaining popularity due to its dual role in recovery and carbon sequestration.

How does CO₂ injection improve oil recovery?

CO₂ injection increases oil mobility by reducing its viscosity and swelling the oil, making it easier to flow toward production wells. It also helps maintain reservoir pressure. This method is especially effective in mature fields and is often used in conjunction with carbon capture initiatives.

 

What are the economic considerations of implementing EOR?

EOR projects require significant upfront investment in infrastructure, chemicals or gas supply. However, they can substantially extend the life of a reservoir and increase total recoverable reserves, making them economically viable when oil prices are favorable or when infrastructure is already in place.

 

What environmental impacts are associated with EOR?

While EOR can reduce the need for new drilling, it may involve increased water usage, chemical handling and emissions. CO₂-based EOR can offer environmental benefits by storing carbon underground, but careful monitoring is essential to prevent leakage and ensure long-term containment.

technologies across major producing basins.

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