Gas reception and separation is modelled for each well stream, both at the wellheads and at the central processing platform where all gas streams are combined for compression. Full gas composition of all incoming gas streams is then derived after co-mingling.
Next, free water will be separated and removed from the well fluids. Condensate will also be separated and removed for export.
Gas Compression System
Pressures and temperatures of gas streams are established before compression and export.
Compressor Analysis
GASMAN rigorously analyses the compressors by carrying out a performance analysis of each compressor casing individually, taking account of the compressor trains selected and well fluid streams specified by the user.
Compressor speed, performance, head, volume flow, pressures and power are calculated for each train, which will be verifiable with actual field performance.
Gas Turbines
MSE has built complete models of RB211-24C gas generators with power turbines for various OEMs.
The model enables you to accurately analyse the increase in power available from proposed changes to the power turbine IGV. The model also evaluates performance gains arising from the new uprated gas generator RB211-24G.
The integrated GASMAN model also determines the net gain in your actual production from the entire system as a result of the proposed modifications.
By analysing the performance of each gas turbine separately based on the power and speed required by the compressor, GASMAN enables you to specify ambient pressure, temperature and filter pressure loss for each gas turbine.
Cooler Pressure Loss
GASMAN analyses pressure losses for your gas coolers based on their design values. Discharge temperatures are also assumed to be the design values. Both pressure losses across the cooler and discharge temperatures can be varied to match test data.
GASMAN Screen Shot
Gasman screen: Shows Layers
Export Pipeline
The pressure drop across your export pipeline is calculated to determine delivery flow and arrival pressure at Bessemer. These pressure-loss characteristics are based on frictional-loss pipelines.
Alarms
The GASMAN database contains alarm set points for all major items of equipment. The alarm levels will be set to ensure that your equipment does not operate at conditions beyond their design limits.
The program normally converges to a solution even if some equipment is operating beyond design limits. However, if values vary too greatly from design specifications, then the system may be unable to converge to a solution. In either case, alarms are generated which will inform you of the specific equipment which is exceeding design specifications, and the percentage deviation from design at which the equipment is trying to operate.
The GASMAN system includes a database of design and test data for each system component. This database is set up and verified thoroughly in a series of functional tests at MSE. The exact nature of the data required for the database will be provided to you in a separate document.
For further information on how GASMAN can help optimise your gas production, please call +44 (0)20 8773 4500 or info@mse.co.uk.