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INST212D
RESERVOIR ENGINEERING
Reservoir Engineering
Learning Objectives of Day 2:
� Basic concerns of Reservoir Engineering
� Scope of Reservoir engineering
� Basic concepts and operating variables
� Tolls of reservoir engineering
� Terminology for MBE calculations
DEFINITIONs OF
RESERVOIR ENGINEERING
Colhoun “The phase of engineering
which deals with the transfer of
fluids to, from or through the
reservoirs“.
Functions OF RESERVOIR
ENGINEERING
To continuously monitor the reservoir and collect relevant data and interpret it to be able to
1. Determine (present conditions))
2. Estimate ( future conditions) and
3. Control
the movement of fluids through the reservoir so that
Objectives of reservoir
engineering
a) To enhance ( increase recovery
factor) and
b) To accelerate ( increase production
rate)
the oil recovery
Types of reservoir energy
1. - Energy of compression of water and rock within the reservoir
2. - Energy of compression of oil within the reservoir
3. - Energy of compression of gas within the reservoir
4. - Energy of compression of water that are in adjacent or underlying aquifers
Types of reservoir energy
5. The gravitational energy that
causes oil and gas to segregate
within the reservoir
6. The surface energy manifesting
itself in capillary pores
Producing mechanismsbased on dominant reservoir energy being released
Common special
Depletion
drive
Gas cap
drive
imbibition compaction
Solution
Gas drive
Full Partial
Segregating Nonsegregating
Water drive Combination drive
Formation
driveI.Edge
II.Bottom
I.Edge
II.Bottom
gravity
Basic concerns of reservoir engineers
(i.e.Reservoir engineer has to
continuously answer:)
1. To calculate the volume of the initial
hydrocarbon present in the
reservoir ?
2. How much of the initial fluids have
been recovered ?
3. How much is left ?
Reservoir engineer has to
continuously answer:
4. How can we increase recovery
economically?
5. What data are needed to answer the
questions?
Reservoir engineer has to
continuously answer:
7. How can I measure the performance
of the reservoir?
8. How can I improve the
performance?
Scope of Reservoir engineering:
Reservoir engineer has to understand
(1) the nature of reservoir fluids
(2) the nature of reservoir rocks
` `(3)the nature and behavior of rock
fluid systems
Scope of Reservoir engineering:
In dealing with rock fluid systems we
have
basic concepts and
operating variables.
Basic concepts are: multiphase fluid
flow, capillary behavior and fluid
displacement are to name a few.
Scope of Reservoir engineering:
Operating variables are:
geometrical configuration of the rock-fluid system, i.e.
spacing of wells
boundary conditions of flow, i.e. rates at which oil is
produced or pressure allowed to change in the well
Types and characters of the reservoir fluids involved, i.e.
amount of gas space allowed to develop, the water
injected or relative viscosities of oil and water
The sequence of operations undertaken,.i.e. whether
pressure depletion is permitted before or after
injection of water
Tools of Reservoir engineering:
Under the influence of these
operating variables, answering the
previous questions requires material
balance calculations and
performance evaluations i.e
predictions and interpretations.
Tools of Reservoir engineering:
Among the predictive and
interpretation tools available are
simple MBE equation (zero
dimensional), frontal advance
equation (1D), numerical
simulators.