Advanced Reservoir Engineering - Material Balance

Front

What is the general material balance equation used for?

Back

It accounts for volumes initially in-place, produced from, injected into, and remaining in a reservoir.

Front

What are the assumptions of the material balance method?

Back

Reservoir volume and temperature is constant, complete equilibrium between oil and its solution gas, initial vapor and liquid phases may exist, oil can be volatile, water can invade from the aquifer, and water and rock are compressible.

Front

What does the material balance equation help estimate?

Back

It helps estimate oil and/or gas initially in place and probable drive mechanisms.

Front

What is the significance of the graphical form of the material balance equation?

Back

It may be used to estimate volumes initially in-place.

Front

What is the role of historical data in the material balance method?

Back

Sufficient historical data of reservoir pressure and production is required.

Front

What is the depletion drive index?

Back

It measures the effects of oil phase expansion.

Front

What is the segregation drive index?

Back

It measures the effects of gas-cap expansion.

Front

What is the water drive index?

Back

It measures the effects of aquifer expansion.

Front

What is the formation drive index?

Back

It measures the effects of rock compaction.

Front

What is the difference between dry gas reservoirs and gas-condensate reservoirs?

Back

Dry gas reservoirs have no free oil, while gas-condensate reservoirs include liquid condensate phases.