lesson 7 Flashcards
The effectiveness of a ______depends
on many factors including:
Reservoir and fluid characteristics such as depth, structure and
fluid type.
Type of wells, well rates, and well locations.
Well distribution, known as the well pattern.
displacement process
is quantified by comparing initial
and final volumes in place. It takes into account
volumetric and displacement efficiencies.
Recovery efficiency
The different aspects of recovery efficiency are defined and then combined to form
overall recovery efficiency.
can approach 100% if residual
oil saturation can be driven to zero.
Displacement efficiency
accounts for the efficiency of
recovering mobile hydrocarbon.
Displacement efficiency
can be modified to include the effects of swelling. Swelling is represented by using surface volume rather than reservoir volume in the definition of displacement efficiency.
Displacement Efficiency
The volume conversion is achieved by dividing
reservoir volume by formation volume factor.
Displacement Efficiency
In addiction to displacement efficiency, volumetric
factors are needed to determine overall recovery
efficiency – this is based on____ and ___
areal efficiency sweep
efficiency:
are needed to determine overall recovery
efficiency – this is based on areal efficiency and sweep efficiency:
volumetric factors
The product of areal and vertical sweep efficiency is
the volumetric sweep efficiency Evol:
Volumetric Factors
The displacement processes discussed in previous study is fluid displacement between one injection well and
one production well.
Patterns and Spacing
must account for both
volumetric and displacement effects. It is therefore
defined as the product of volumetric sweep efficiency
and displacement efficiency:
Overall recovery efficiency
The alignment of the
injector-producer pair represents a linear displacement process. It is the simplest pattern involving injection
and production wells.
Patterns and Spacing
In addition to reservoir geometry and displacement
process, the well pattern depends on the distribution of
existing production wells and the desired spacing of
wells.
Patterns and Spacing
The location of injection wells depends on factors such
as:
Reservoir structure
Injected fluid type
Displacement mechanism
Well density can be increased by drilling additional
wells in the space between wells in a process called
infill drilling.
A reduction in well spacing requires an increase in the
density of production wells, which is the number of
production wells in a specified area.
Patterns and Spacing
an effective means of
altering flow patterns and improving recovery
efficiency, but can be more expensive than a fluid
displacement process.
Infill drilling is
Optimum performance may be achieved with the
patterns defined in the previous section by controlling
the rates of injectors and producers.
Pattern Recovery
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
Values of injection rates for the three well patterns
previously shown – Direct Line Drive, Staggered Line
Drive, and Five-Spot – are presented next.
Pattern Recovery
.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
(either areal or
cross-sectional) to minimize the
number of cells not in the simulated
region; these cells have no porosity.
Rotate your grid
