Abstract
Summary A reservoir of Z oilfield in the Middle East is a low-permeability carbonate reservoir with strong heterogeneity and complex fluid distribution, including condensate gas cap, oil rim and edge water. Due to depletion mode, formation pressure continually dropped leading to high decline rate and low recovery factor. Furthermore, obvious increase of gas-oil ratio and water cut were observed in the producers close to gas-oil contact and oil-water contact. Therefore, it is necessary to optimize development strategy. Based on experiments and numerical simulation, three development modes are proposed: (1) peripheral water injection; (2) peripheral and barrier water injection; (3) gas and water co-injection. Orthogonal design method is used to analyse the sensitivity of production and injection parameters on recovery factor. The research results show that gas and water co-injection is optimum which enhances recovery factor about 6% during the contract period. The recovery factor is more sensitive to gas injection rate, injection timing and oil production rate. To improve the development effect, the recommended oil production rate is 1.5%–2.0% and the voidage replacement ratios of gas and water injection are 0.4–0.5 and 0.4–0.6, respectively. This paper can provide a reference for similar reservoirs with condensate gas cap to optimize development strategy.
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