1 October 2004 Cutting-Edge Software for Managing Gas Production and Storage Operations.
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Transcript of 1 October 2004 Cutting-Edge Software for Managing Gas Production and Storage Operations.
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October 2004
Cutting-Edge Software for Managing Gas Production and Storage Operations
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1. Goal of forthcoming initial release targeted for 1st Quarter, 2005: • Accurate prediction of performance of gas storage
reservoir/compressor/pipeline systems with a speed that allows hourly/daily scheduling of compressors for production and injection. Schedules obtained are efficient and economic.
• Given a complete database GasPal allows operations to be quickly rescheduled in response to new opportunities or unexpected changes in available equipment and/or supply/demand requirements.
• GasPal, focusing on operational planning, is a logical counterpart to Maraco’s GasTop software, which performs optimal investment planning for storage operations.
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GasPal Characteristics
• GasPal: foundation is a PC-based gas reservoir simulator.• GasPal: complex surface network may include splits, loops and
multiple offtake points.• GasPal: each of several reservoirs may have up to 5 producing
layers • GasPal: GRIDDER™ preprocessor inserts arbitrary number of
computing cells into each reservoir.• GasPal: simulates injection and production or a mixture of the two,
providing full storage scheduling flexibility.• GasPal: hourly, daily or monthly time steps accommodate short-,
mid- and long-term planning needs.• GasPal: optimizes service allocation and size of possible
compressor configurations.
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Operational Planning Scope
• Short-term operation: hourly time steps for two weeks. Useful for immediate injection/withdrawal planning.
• Mid-term planning: daily time step for one year. Useful for overall storage planning.
• Long-term production : monthly time step for 30 years. Useful for regular gas reservoir production or blowdown.
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Surface Flow Capabilities:Splits, Loops & Offtake Points
Produce against or inject with a given back pressure
Produce or inject a requested rate profile
Split flow at node Choke total flow or either flowline
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Surface Line Capabilities:Multiple Reservoirs
Choke each producing cell and/or reservoir to produce requested rate
Each cell in each reservoir may have different characteristics
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Surface Line Capabilities:Compressor Optimization
Compressor locations and sizes optimized to maximize withdrawal, injection and inventory revenues
Work is now underway on GasPal’s compressor scheduling capability
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Reservoir: Arbitrary Number Of Simulation Cells
FaultsComputing mesh generated by GRIDDER
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Reservoir:Multiple Layers
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Results From Current Development Version Of GasPal
October 2004
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Interface Layout
Surface network
Output Results
ReservoirsOfftake points
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Reservoir Output
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Flow Rate Through Each Pipe
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Pressure Drop Across Each Pipe
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Offtake Rate: Fixed Back Pressure
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Pressure: With Offtake Rate Fixed
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Bi-directional Flows
• Gas flow direction is determined by system pressure distribution
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Reverse Flow
Dictated by pressure at end nodes, flow can be reversed
Reversed flow displayed as “negative”