CO2 EOR projects have experienced localized success in the United States due to past investments in CO2 infrastructure made possible by no longer existing government incentives. Many countries mistakenly look at these successful cases, along with the environmental benefit of carbon capture, and embarked on a quest for a CO2 EOR projects prior to securing a CO2 source. This paper discusses the available EOR agents beyond CO2.

This paper is based on efforts made to select EOR agents for a Rocky Mountain region reservoir, and uses a 10 MMBBL mechanistic model to assess EOR agents. Sourcing, purchase volumes, costs, infrastructure requirements, and a brief summary of the benefits and challenges are presented for the following EOR technologies:

  • Carbon Dioxide

  • Ethane + other Hydrocarbon Gases

  • Flue Gas (90% N2, 10% CO2)

  • Nitrogen

  • Alkali (different types)

  • Surfactant (different types)

  • Polymer (different types)

  • Combinations of alkali, surfactant, and polymer

The logistic considerations identified in the evaluation of the Rocky Mountain region field are universal and can assist EOR agent selection in North America, the Middle East, and anywhere on Earth.

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