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.
Read the first 7 Reservoir Engineering & Management flashcards as text
Which dimensionless number governs the ratio of viscous to gravity forces during reservoir fluid displacement?
Answer: Gravity number
The gravity number (ratio of gravity to viscous forces) determines whether gravity override or underride occurs during immiscible displacement.
In a naturally fractured reservoir (Type 1 NFR), the matrix blocks primarily act as:
Answer: Storage volumes that feed fluids into fractures
In Type 1 NFRs, the matrix provides the dominant storage capacity while the fracture network provides flow capacity (permeability) to the wellbore.
The Lorenz coefficient is used in reservoir engineering to quantify:
Answer: Vertical heterogeneity of permeability
The Lorenz coefficient (0 = perfectly homogeneous, 1 = perfectly heterogeneous) measures permeability variation across reservoir layers from a flow capacity plot.
During secondary recovery by waterflooding, the economic limit is typically reached when:
Answer: The incremental oil revenue no longer covers lifting costs at prevailing WOR
The economic limit occurs when the value of incremental oil production no longer justifies operating costs, often at very high water-oil ratios.
Which EOR method is most suitable for a high-temperature, high-salinity carbonate reservoir with moderate viscosity oil?
Answer: Miscible CO2 injection
Miscible CO2 injection is effective in carbonates with moderate viscosity oil because CO2 achieves miscibility at attainable pressures and is less sensitive to salinity and temperature than chemical EOR.
The concept of 'skin factor' in well testing represents:
Answer: Additional pressure drop due to near-wellbore damage or stimulation
Skin factor (S) quantifies the extra pressure drop caused by near-wellbore damage (positive S) or stimulation such as hydraulic fracturing (negative S).
Interporosity flow coefficient (λ) in dual-porosity models describes:
Answer: The fluid transfer rate between matrix and fractures
Lambda (λ) characterizes how easily fluid transfers from matrix blocks into the fracture network, controlling the transition period on pressure transient plots.