After natural depletion, what is the most common secondary oil recovery method?

After natural depletion, what is the most common secondary oil recovery method?

• A. Steam Flooding
• B. Waterflood
• C. Gas Flooding
• D. CO2 Flooding

Answer: (B)

After the reservoir’s natural drive has diminished, the most common way to recover more oil is by injecting water to push oil toward the production wells. This waterflooding approach maintains reservoir pressure and creates a displacing front that sweeps oil from the rock toward the wells, increasing the overall recovery compared with primary production alone. It’s favored because water is inexpensive and widely available, the process uses mature, well-understood technology, and it can be applied to many reservoirs with relatively straightforward surface facilities. Thermal methods like steam flooding target heavy or viscous oils by heating them to reduce viscosity, but they require more energy, equipment, and cost, making them less universally applicable. Gas injection methods (such as gas flooding or CO2 flooding) can be effective but depend on the availability and cost of gas and are not as broadly applicable as waterflooding.

After the reservoir’s natural drive has diminished, the most common way to recover more oil is by injecting water to push oil toward the production wells. This waterflooding approach maintains reservoir pressure and creates a displacing front that sweeps oil from the rock toward the wells, increasing the overall recovery compared with primary production alone. It’s favored because water is inexpensive and widely available, the process uses mature, well-understood technology, and it can be applied to many reservoirs with relatively straightforward surface facilities.

Thermal methods like steam flooding target heavy or viscous oils by heating them to reduce viscosity, but they require more energy, equipment, and cost, making them less universally applicable. Gas injection methods (such as gas flooding or CO2 flooding) can be effective but depend on the availability and cost of gas and are not as broadly applicable as waterflooding.