This paper outlines the formulation of a re-development plan for the oldest producing field in the Middle East, Masjed-ISuleyman, discovered in 1908 in the South West of the Islamic Republic of Iran and put into production in 1911. The field location is shown in Figure 1. The difference between the volume and type of data acquired in 1908 versus that acquired now is in itself one of the greatest challenges to overcome when undertaking such a study. The field does not have a virgin reservoir fluid sample, nor early pressure measurements, or any measurement of produced gas volumes. However, these are key parameters which must be tested rigorously in the reservoir models. The redevelopment plan revolves around a comprehensive reservoir study of the Asmari formation, a complex, fractured carbonate reservoir. The objectives of this study - the first on the field - are to gain a better understanding of the reservoir and its production and pressure performance over nearly a century and to develop a plan for further developing the field by drilling new vertical and horizontal wells. Reservoir characterization provides input data for a full field, dual porosity simulation model, which in turn verifies the input data. Complicated reservoir pressure and production history matches were successfully obtained to provide the basis for future production forecasts. Re-injection of gas and water to maintain reservoir pressure was also reviewed. Sensitivity studies on different locations for the new wells shows that a substantial incremental recovery can be recovered. Apart from the inherent geological complexity, the project faced tremendous data challenges such as the first field report having been written some 37 years after the start of production.
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