A major Integrated Petroleum Engineering Study of the Bul Hanine Arab D, the most prolific reservoir Offshore Qatar containing a STOIIP of 2.4 billion bbl (382 Mm), has been completed. This paper will present not the detailed construction, history match and prediction runs of the model but, rather, concentrate on the steps leading up to identification of target zones for future redevelopment (the remaining oil).

Due to the large size and complex geology of this carbonate reservoir it was impossible, even if it would have been desirable, to design a simulation model to examine in detail all aspects of the historical and future development. This being the case a model was constructed which aimed to predict the likely future production of the existing wells and similarly completed new wells and to identify the location of the remaining oil which could be the target of an altogether different method of production. In the end two unswept zones have been identified for future development, one of which may involve the drilling of thirty horizontal wells. The necessity of studying the expected performance of the new type of wells with simulation models designed specifically for the purpose will be highlighted together with the need to perform field trials to confirm their results.

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