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Reservoir Engineering & Management Flashcards

7 cards from real SPE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

    Answer: Water drive

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

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

    Answer: Cumulative water influx into a reservoir

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

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

    Answer: Pseudo-reduced pressure and pseudo-reduced temperature

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

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

    Answer: The fractional flow equation and continuity equation

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

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

    Answer: Optimizing well pattern geometry and infill drilling

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

  6. Which equation is used to calculate original oil in place (OOIP) using the volumetric method?

    Answer: N = 7758 × A × h × φ × (1 - Sw) / Boi

    The volumetric OOIP formula multiplies the reservoir bulk volume (7758 × A × h), net-to-gross porosity, and hydrocarbon saturation, divided by the initial oil FVF.

  7. What is the primary purpose of a pressure transient test (e.g., buildup test) in reservoir engineering?

    Answer: Determine reservoir permeability, skin, and boundaries

    Pressure buildup tests analyze wellbore pressure recovery after shut-in to determine near-well permeability, skin damage, and detect reservoir boundaries.