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Abstract
Well testing is an important tool for reservoir evaluation and
characterization. Designing of a test plan is very important before starting
that test. Reservoir simulation is widely used to solve research problems
as well as actual field problems. This is due to the limitation of analytical
solutions and its ability to be used in predictive methods for reservoir
management purposes.
The major objective of this research is to develop a catalogue of
modeling programs (or techniques) to simulate well tests in different
shapes of petroleum reservoirs using a conventional reservoir simulator
GASSIM. This catalogue includes modeling programs used to simulate
pressure drawdown and buildup tests for wells in homogeneous-acting
reservoirs, wells containing vertical hydraulic fractures, wells intersecting
naturally fractured reservoirs and wells producing from commingled
layers.
New or alternative modeling techniques were developed to solve
specific well problems important in reservoir characterization. These new
techniques include the new relations used to model the combined effect
of wellbore storage and skin in pressure-transient tests and an alternative
grid construction to be used in modeling well with vertical hydraulic
fractures. Both oil and gas cases with radial and areal grids are designed.
Comparing the results of these models with the analytical solutions
from a commercial WELL TEST software has been used to verify their
reliability. The developed models can be used to study the factors
affecting well testing in the different shapes of reservoirs.
It is believed that such approach will provide a reference for
modeling, designing tests in these shapes of reservoirs, and making
different studies on factors affecting pressure transient tests and affecting
well behavior in them in general.iii