chapter 7 Flashcards
(24 cards)
is quantified by comparing initial
and final volumes in place. It takes into account
volumetric and displacement efficiencies.
Recovery Efficiency
accounts for the efficiency of
recovering mobile hydrocarbon.
Displacement efficiency
Defined as the ratio of mobile oil to original oil in
place at reservoir conditions:
Displacement efficiency
In addiction to displacement efficiency, ____________ are needed to determine overall recovery
efficiency – this is based on areal efficiency and sweep
efficiency:
Volumetric Factors
must account for both
volumetric and displacement effects.
Overall Recovery Efficiency
Patterns and Spacing
The location of injection wells depends on factors such
as:
Reservoir structure
Injected fluid type
Displacement mechanism
Pattern Recovery
Optimum performance may be achieved with the
patterns defined in the previous section by controlling
the rates of injectors and producers. These calculations
can be performed analytically if we assume:
The displacing and displaced fluids are incompressible.
The mobility ratio is one.
The reservoir has uniform properties.
finds
the pressure distribution for a given time step
first then calculates the saturation distribution
for the same time step isothermal.
BOAST -Black Oil Applied Simulation Tool
.The toolbox consists of **two **main
parts: a core offering basic functionality and
single and two-phase solvers, and a set of
add-on modules offering more advanced
models, viewers and solvers.
MRST - The MATLAB Reservoir Simulation
provides a set
of open-source tools centered around the
simulation of flow and transport of fluids in
porous media.
OPM - The Open Porous Media
Well density can be increased by drilling additional
wells in the space between wells in a process called
___________.
infill drilling.
When strong directional
permeability trends
____________ exist,
(ANISOTROPY)
(from well
to well) best approximates field
conditions (requiring the least
amount of relative permeability
adjustment to match history).
FLOW VIA DIAGONALS
(either areal or
cross-sectional) to minimize the
number of cells not in the simulated
region; these cells have no porosity.
Rotate your grid
In orienting the grid system, if
________ are ________ to the axes, it
is much simpler to define them.
faults and parallel
____________ should be located as close as
possible to the center of the cell;
Wells
models are usually
easier to define than areal
considerations.
CROSS-SECTIONAL
GRIDS
______________
incorrect fluid movement
due to the gridblock effect.
numerical dispersion
____________ determination must be calculated to
fit the grid.
Cell property
____________modeling is accomplished by
modifying transmissibilities, pore volumes, and rates.
Partial Field
________________ allows the
use of a fine grid within a coarse grid, as for example,
defining well cell**s in a field-wide model.
LOCAL GRID REFINEMENT
________________ allows the use of
non-orthogonal shapes in describing reservoirs.
Corner Point Gridding
The definition of displacement efficiency can be
modified to include the effects of swelling.
Displacement Efficiency
