A giant onshore field producing from multilayered undersaturated carbonate reservoir presents many challenges. The field is producing since early seventies supported with peripheral water injection leading to wide variation in reservoir pressure and water cuts. The field has been produced with the help of 6 gathering manifolds. The northern manifold presents additional challenges as this area is affected with asphaltenes deposition problems in production tubing and flow lines. Tubing obstruction due to asphaltenes adversely affects flow basides cause difficulty in lowering pressure gauges resulting into scarcity of pressure survey data. Additionally, some wells are operating on gas lift and a gas injection pilot is located on the western side leading to Gas Oil Ratio (GOR) variations. The horizontal wells completed in the low permeability layer tend to cease production as the water cut reaches >35%. Production allocation, optimization and de-bottlenecking become difficult in such a scenario. It was, therefore, decided to build a production network model as a tool to overcome such problems. This paper presents the process of preparing the production network model. Tuning PVT properties for the field is described with reference to pressure traverse correlations. Well model calibration with paucity of pressure survey data was achieved with good agreement with production history. Production from each well at different choke setting, water cut and reservoir pressure was estimated and compared with field data. Proper tubing size selection would allow stable flow in the tubing even at high water cut differing gas lift implementation for many years. Production network model is a necessary tool for production and reservoir engineers for optimization, de-bottlenecking and potential estimation.

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