LESSON 3&4 Flashcards
Volumetric analysis ________ to determine the
volume in a process. Often use by
Geoscientist
use static information
Material balance and reservoir
simulation _____________ to obtain
estimates of fluid volumes originally
in place in the reservoir.
use dynamic data/information
Three decline curves based on the value
of n or(b).
Exponential Decline curve
Hyperbolic Decline curve,
Harmonic Decline curve
bulk volume of each gridblock defined in _____is calculated from the gross thickness of each gridblock and the gridblock lengths
cartesian coordinate system
If we maintain separate phase
equations, we have __________
formulation with three equations
per cell;
FULLY IMPLICIT
in this formulation, the saturation
derivatives with respect to time
cannot be eliminated and
must be
approximated using finite
difference.
where the pressures associated with the left hand side of the equation are locationally dependent and those on the right hand side are time dependent
Explicit Pressure Solution
Assuming saturation does not change are held constant
during pressure solution.
Implicit Pressure
Combines IMPES approach with Buckley Leverett
Saturation Solution.
1.)Sequential Modification
Semi-implicit
A variation in IMPES:
1.)Sequential Modification
2.)Fully implicit
Is usually applied when there is large saturation
changes over a given timestep. (extremely tiny
timesteps are required)
2.)Fully implicit
TWO TYPES OF MATRIX SOLUTION:
1).DIRECT
2.) ITERATIVE
—Solves system of equations in one set of
calculations
DIRECT
—use some sort of predictor-corrector technique
to converge on the answer.
ITERATIVE
1.) DIRECT
(GAUS)
2.) ITERATIVE
(SIP)
(SOR)
(CGL)
(ADI)
Simplified
theoretical
development of
three-phase,
three-dimensional
flow equations
fluid flow simulation
