Maraco Inc.
2014
What Is GasPal?
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What Is GasPal?
 GasPal is an integrated gas reservoir simulator that
 Integrates formation, tubing and surface lines
 Models multiple phase flow in formation and pipes
 Combines cluster of reservoirs with multiple layers
 Allows multiple offtake points
 Allows loops and splits in surface network
 Models production and injection wells for storage reservoirs
 Has different production modes such as Free Flow, DCQ and
Nomination
 Makes short, mid and long term planning with hourly, daily
and monthly time step
 Imposes quality constraints such as CO2 content
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Integrated Nodal Analysis
Surface Line
Surface
Reservoir
Gas
Gas
Tubing
Layer 1
Layer 2
Aquifer
Gas
Layer 3
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Modeling Each Reservoir With
Arbitrary Grids
Arbitrary grids
allow fewer cells to
model a reservoir
effectively. Fewer
cells translate to
fast simulation.
GasPal models well
interference
effectively with a
grid tailored to the
reservoir by the
user.
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Modeling Gas, Water and Oil Flows in
Reservoir
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Modeling Multiple Phase Flow in Tubing
Industry standard
correlations are used
to model tubing
pressure drop for
multiple phase flow.
Users can further
calibrate each
correlation against
well test data, using a
least squares method
imbedded in an
effective proprietary
algorithm.
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Modeling Fluid Flow in a Surface Network
1. Loops and splits
in surface lines
2. Multiple offtake
points
3. Compressors
and other
surface facilities
such as
separators
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Model Production System With Multiple
Platforms and Complex Surface Network
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Why GasPal?
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GasPal Is Versatile
 GasPal can model a production system as simple as a single
simulation cell, single layer, or as complex as 50+ platforms
with 800+ wells and 5000+ layers.
 GasPal can make short, medium and long term forecasts
with hourly, daily, weekly or monthly time steps.
 GasPal has multiple production modes to model different
scenarios:
 Free flow without choke and other mechanical restrictions
 Limited flow considering sand-control, pipe vibration,
market demand, spare capacity, CO2 constraints and more.
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GasPal Is Fast
 A typical 30-years simulation run takes
 Seconds for a single platform
 Minutes for a moderate complex system
 Less than 2 hours for a 800+ wells, 5000+layer system
 Fast simulation allows users to make different case-
studies to answer “what-if” questions quickly
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GasPal Is User-Friendly: Input
 GasPal runs on any Windows-based computers
without special requirements.
 GasPal has carefully crafted Graphic User Interface,
designed by petroleum engineers, used and improved
by petroleum engineers
 Users can enter data
 Using conventional methods such as typing data
reservoir by reservoir, or
 Using copy-and-paste from Excel through several
“Grand Data Input” panels
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GasPal Is User-Friendly: Output
 GasPal has extensive built in output graphs (150+ types
and growing) so users can analyze the simulation
results without leaving GasPal.
 GasPal also writes output results into MDB database
files so users can use existing tools to do other analyses
 GasPal can also export output into text/CSV files that
can be readily loaded into Excel.
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Sample Output and Menu for Output
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GasPal Has Many Features
 Convenient history match
 Well gas, water and condensate rates
 Flowing, wellhead and gauge pressure
 Manifold pressure, rate and CO2 content
 Numerous well inflow options
 Standard Darcy’s law (drainage radius, k, h & skin)
 AB method
 C/n method, etc.
 Numerous ways to model water and condensate
productions
 Darcy’s law and relative permeability curves
 Empirical WGR/CGR curves for wells or layers
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Continuously Improving
 GasPal is updated regularly to add new features. Some
of the recent additions are
 Well and surface facility downtime
 Platform maintenance scheduling
 Gray well cutoff rate method
 Non-adiabatic compression modeling
 Liquid removal at various surface locations
 Time-dependent surface network
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Fast Services From Maraco
 Quick response to answer users questions
 Proactive to new features requested by users
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Dr. Elmer Dougherty
 President, founder Maraco.
 Professor Emeritus, Petr &
Chem Eng, USC - University
of Southern California
 SPE – Distinguished Member
& Legion of Honor
 50 years of reservoir
simulation and optimization
experience.
[email protected]
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Dr. Jincai Chang
 Petroleum consultant
and software engineer.
 23 years of experience in
reservoir simulation and
optimization
 Teaching “Reservoir
Simulation” at
University of Southern
California, Los Angeles,
California, USA
[email protected]
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