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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. The term 'connate water saturation' (Swc) refers to:

    Answer: Irreducible water saturation bound by capillary forces in the reservoir

    Connate (irreducible) water saturation is held in place by capillary forces and cannot be displaced by hydrocarbons under normal reservoir conditions.

  2. Which plot is used in decline curve analysis to identify exponential, hyperbolic, or harmonic decline?

    Answer: Log rate vs. cumulative production (Fetkovich type-curve)

    Fetkovich type-curves plot log rate vs. cumulative production to match decline behavior and distinguish exponential (b=0), hyperbolic (0<b<1), and harmonic (b=1) decline.

  3. In a gas reservoir, P/Z vs. cumulative gas production (Gp) plots are used to estimate:

    Answer: Original gas in place (OGIP)

    The linear P/Z vs. Gp trend, when extrapolated to P/Z = 0, gives the OGIP for a volumetric gas reservoir with no water influx.

  4. Relative permeability to oil at residual oil saturation (Sor) equals:

    Answer: 0

    At residual oil saturation, oil is discontinuous and immobile, so relative permeability to oil is zero by definition.

  5. Which reservoir heterogeneity parameter describes the coefficient of variation of permeability used in the Dykstra-Parsons method?

    Answer: Dykstra-Parsons coefficient (V)

    The Dykstra-Parsons coefficient V (0 = homogeneous, 1 = infinitely heterogeneous) is derived from log-normal permeability distributions on probability paper.

  6. A negative skin factor obtained from a pressure buildup test most likely indicates:

    Answer: A hydraulically fractured or acid-stimulated well

    Negative skin values indicate the well is producing better than an ideal undamaged well, typically due to hydraulic fractures or acid stimulation that bypass near-wellbore damage.

  7. Material balance for an undersaturated oil reservoir (above bubble point) simplifies to the equation relating pressure decline to:

    Answer: Compressibility of oil, connate water, and rock

    Above bubble point, reservoir depletion is driven by expansion of oil, connate water, and rock (pore volume compressibility), with no free gas or gas cap contribution.