527 Q13 CO2 EOR

CO₂ EOR has the potential to sequester the billions of tons of CO₂ emitted from fixed-point sources, like power plants.

• True

• False

EOR has no effect on the current proven oil reserves.

• True

• False

What is the mechanism of EOR with CO₂ injection?

• CO₂ is injected in gaseous phase, and its large volume displaces the oil out of the well.

• CO₂ is injected as a supercritical fluid that is miscible with oil, so the CO₂ combines with oil and helps move it through the rock pore spaces.

• CO₂ reduces the permeability of the earth layers above the oil reservoir, so the oil permeates through them.

• The oil evaporates underground due to CO₂ injection, and the oil vapor rises easily up.

During the operation of a well with CO₂ EOR, all the injected CO₂ is trapped underground, while oil only comes up.

• True

• False

CO₂ EOR is best suited for newly discovered oil wells.

• True

• False

Successful implementation of EOR requires

(check all that applies; no partial credit)

• adding CO₂ injection infrastructure to existing wells.

• creating pipelines to transport CO₂ from its source(s) to the EOR site.

• reducing CC costs and increasing operational efficiency to enable an even greater amount of CO₂ to be economically captured from point sources.

• digging for new oil wells.

The advantage(s) of CO₂ EOR over conventional CO₂ sequestration is/are

(check all that applies; no partial credit)

• CO₂ EOR does not require extensive new land impacts.

• the injected CO₂ in EOR will be trapped by the same geologic mechanism that trapped the oil or natural gas in the well.

• CO₂ EOR provides long-term storage of CO₂ without imposing a government-mandated price on carbon.

• lower pressures are needed for injecting CO₂ in EOR.

• simultaneous CO₂ sequestration and oil-production enhancement.

If a depleted (closed) oil well demonstrates that CO₂ has not migrated out of the rock formation over the near term (tens of years), then there can be great certainty that no migration will occur in the long term (hundreds or thousands of years).

• True

• False