Name
Bassey Iniko Ekeng
Scholastic degree
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Academic rank
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Honorary rank
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Organization, job position
Kuban State Technological University
Web site url
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Articles count: 2
Waterflooding helps in the recovery of great amount of
oil that would have otherwise been abandoned in the
reservoir that is depleted. A reservoir in the Niger
Delta, Reservoir X has been used to illustrate this.
Reservoir X had oil initially in place as 7.345 MMSTB
and was produced for some time with the reservoir
natural energy. The remaining oil in the reservoir as at
the time that the natural energy of the reservoir was no
more sufficient to produce oil was 2.96MMSTB. The
reservoir has been left as depleted reservoir with the
remaining oil in it. But from the analysis conducted in
this work it is seen that if secondary oil recovery
project by waterflooding is embarked on the reservoir,
part of the remaining abandoned oil would be
recovered. With the specifications given, about
1.22MMSTB of the 2.96MMSTB of oil in reservoir X
would be produced as at the breakthrough time of 580
days. Moreover, considering the economic aspect of
the project, reservoir X and is good to be invested in.
From the NPV calculations performed, it is seen that
the NPV of reservoir X at discount rate of 10% is
$4.13 million
Water flooding used in secondary oil recovery to level
up reservoir pressure can be enhanced in order to fit
the reservoir conditions with the aim to optimally
recover oil. One of the important optimization
variables to realize this aim is optimal well placement.
Various methods have been suggested for this
problem. Among these is direct optimization, although
accurate, is difficult due to the number of simulations
required. Optimal placement of up to six injection
wells was studied at the X field in western Niger Delta
of Nigeria. Injection rate and injection time was also
optimized and net present value (NPV) of the flooding
project was used as the objective function. In this case
study, it is shown theoretically and by means of
Eclipse 100 that according to the basic elementary
reservoir characteristics, optimal oil recovery is
strongly dependent on well placement pattern and
injection rate. Simulation results show that good sweep
efficiency can be achieved with a regular pattern with
an optimal well position