Modeling of large, shallow gas fields that produce into complex gathering systems was once a difficult and uneconomical task. The Hatton held, in southwest Saskatchewan, Canada, has 800 wells (1,367 completions) and a complex surface network with substantial Line looping and now splitting. The field has low permeability and three isolated productive zones. A model of the surface network and reservoirs was developed and used to plan facilities modifications to connect infill wells and prepare long-term forecasts.