SPE Reservoir Engineering & Management 2

Question 1

Which drive mechanism typically yields the highest primary recovery factor in oil reservoirs?

Accepted Answer

Water drive

Answer

Water drive reservoirs typically achieve the highest primary recovery (40–60%) because water maintains reservoir pressure more effectively than other mechanisms.

Question 2

The van Everdingen-Hurst aquifer model is used primarily to calculate:

Accepted Answer

Cumulative water influx into a reservoir

Answer

The van Everdingen-Hurst model provides transient aquifer influx calculations using dimensionless time and influx functions.

Question 3

In a gas reservoir, the z-factor (gas compressibility factor) is determined as a function of:

Accepted Answer

Pseudo-reduced pressure and pseudo-reduced temperature

Answer

The z-factor is obtained from correlations (e.g., Standing-Katz chart) using pseudo-reduced pressure and temperature derived from gas composition.

Question 4

Buckley-Leverett theory predicts the frontal advance rate of a displacing fluid by applying:

Accepted Answer

The fractional flow equation and continuity equation

Answer

Buckley-Leverett combines the fractional flow equation with the continuity equation to predict saturation profile movement during immiscible displacement.

Question 5

A reservoir's areal sweep efficiency in a waterflood is most directly improved by:

Accepted Answer

Optimizing well pattern geometry and infill drilling

Answer

Optimizing injector/producer well patterns (e.g., five-spot, inverted nine-spot) and adding infill wells directly improves areal sweep of the flood.

(SPE) Society of Petroleum Engineers Certification Practice Test

(SPE) Society of Petroleum Engineers Certification Practice Test

SPE Reservoir Engineering & Management 2