### Bjørn Nygreen (NTNU, Norway)

#### Optimal off-shore gas production

*Wednesday 17 October 2001 at 15.30, JCMB 6310*

##### Abstract

The purpose of this talk is both to describe how a short-term gas
production problem can be modelled as a mathematical program and to show
how such models can be implemented in a use-friendly way. The problem has
demand that varies both between seasons and between days, such that the
production also has to be varied. The model consists of multi component
flows in pipes, linear quality constraints on the composite products,
non-linear splitting of flows in chemical equipment and production
decisions. The non-linear parts are modelled discrete, such that the
resulting model is a mixed integer linear program.

A spreadsheet (Excel) for database, pre- and post processing and a
commercial linear programming system (Xpress-mp) have been used for
implementing the model.

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