Independent Production Forecasting of Current Facilities with or without Re-design
To ensure that the new re-design will operate
in the production facility we test the new compressor using the
GASMAN model. GASMAN is the integrated
model of the production system which includes the gas
compression system, the processing facility, the gas turbine
drive, the recycle system and the process control set points.
To more accurately optimise the compressor design, the effect of
changing reservoir and well performance must also be included. This is achieved by the integration of
subsurface system with the compression facilities; this provides
a more robust solution and ensures that the reservoir and
sub-surface performance risks are included in the new compressor
design.
Once the GASMAN model has been verified against field data with the
current compressor design, it allows alternative compressor
designs to be tested. The model is run in the predictive mode,
for the next 5 - 10 years, to verify the compressor
performance. After a few iterations it is possible to
identify the most appropriate compressor designs which would
provide the best performance with the reservoir and well
combination.
The revised compressor design, after testing, is then passed
on to the compressor vendor for final confirmation. The vendor
selection is tested in GASMAN to verify the
performance. It is a normal practice to normalise the
performance of a compressor to allow for in-service
performance variations. MSE maintains a
large database of machinery in service field performance; the database
provides a good indication of expected performance
variations in the field.
