STOR

Which recovery method is characterized by utilizing naturally existing reservoir pressure to drive oil towards the wellbore?

• Enhanced Oil Recovery (EOR)

• Secondary Recovery

• Waterflooding

• Primary Recovery

Secondary recovery techniques, like waterflooding, are implemented when natural reservoir pressure is insufficient to sustain economic oil production, aiming to displace remaining oil.

• True
• False

What is the primary goal of Enhanced Oil Recovery (EOR) techniques?

• To extract the 'easy' oil that flows naturally.

• To reduce the cost of primary recovery.

• To increase the viscosity of the oil.

• To recover oil left behind after primary and secondary methods.

Define Improved Oil Recovery (IOR) and how it differs from Enhanced Oil Recovery (EOR).

In the context of hydrocarbon recovery, waterflooding falls under the category of (a)   recovery methods.

During waterflooding, what causes the oil to be swept toward the producing wellbore?

• The natural pressure of the reservoir rock

• The decrease in water density

• The increase in oil viscosity

• The flow of water through the formation

Match each type of oil recovery with its typical oil recovery percentage range:

• Less than 30%

• Primary Recovery

• 30-50%

• Tertiary Recovery

• Greater than 50%

• Secondary Recovery

Which of the following is a key objective of waterflooding in oil reservoirs?

• To increase volumetric sweep efficiency

• To increase gas saturation in the oil

• To decrease the reservoir pressure

• To increase oil viscosity

Injecting water below a VRR of 1 is often due to issues like water unavailability and surface constraints.

• TRUE

• FALSE

What happens to oil viscosity as pressure decreases below the bubble point?

• Increases linearly

• Increases sharply

• Decreases rapidly

• Remains constant