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
The Productivity Index (PI or J) of an oil well is defined as:
Answer: Flow rate divided by drawdown (Pr - Pwf)
PI = q / (Pr - Pwf), relating flow rate to the pressure drawdown; it measures a well's ability to deliver fluids under a given pressure differential.
Thermal EOR methods such as steam flooding are most applicable to reservoirs containing:
Answer: Heavy oil or bitumen with viscosity above ~100 cp
Steam reduces heavy oil viscosity dramatically (often by orders of magnitude), making it mobile enough to flow to producing wells.
The pseudo-steady-state (PSS) flow regime in a bounded reservoir is characterized by:
Answer: Uniform pressure decline rate throughout the reservoir
During PSS, boundaries have been felt and reservoir pressure declines at the same rate everywhere, with the pressure gradient remaining constant in shape.
Minimum Miscibility Pressure (MMP) in a CO2 flood is most strongly influenced by:
Answer: Reservoir oil composition (C5–C30 fraction) and temperature
MMP depends on reservoir temperature and the C5–C30 intermediate fraction of the crude oil; heavier oil composition and higher temperature both increase MMP.
The Corey exponents in relative permeability correlations control:
Answer: The shape of the krw and kro curves between endpoint saturations
Corey exponents (nw and no) define the curvature of relative permeability curves; higher exponents create more concave curves with lower relative permeabilities at intermediate saturations.
In reservoir simulation, history matching is performed primarily to:
Answer: Calibrate the simulation model to match observed field performance before forecasting
History matching adjusts uncertain model parameters (permeability distribution, contacts, aquifer strength) until the model reproduces historical production and pressure data.
Which drive index term in the Havlena-Odeh material balance formulation accounts for formation and connate water compressibility?
Answer: Connate water and rock expansion term (N·Boi·(cw·Sw+cf)/(1-Swc)·ΔP)
The connate water and rock compressibility term captures pore volume reduction and connate water expansion as reservoir pressure declines, important above bubble point.