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• W1986009494 abstract "Abstract Condensate banking is a much studied phenomenon in gas condensate reservoirs. An excessive drop in flow rate occurs when the bottom hole flowing pressure of a producing well falls below the dew-point pressure. Condensate dropped around the well bore increasingly reduces relative permeability to gas until a critical liquid saturation is reached. As liquid saturation increases above the critical value, two phase flow of both liquid and gas creates the equilibrium necessary to maintain the reduced, but steady state flow. The reduced gas permeability is described as a positive skin reducing the well rate PI used in the forecasts. In more severe cases, the PI may be reduced to cause sub-commercial rates. Even though several equations are available in the literature to estimate skin damage due to condensate banking, it is well recognized that localized reservoir characteristics, especially in naturally fractured carbonates must be applied to obtain an accurate value. In this paper, numerical inverstigations of the impact of condensate banking on well productivity in the North Kuwait Jurassic Complex (NKJC) gas-codensate reservoirs are performed. A representative reservoir from Sabriyah field in the Najmah Sargelu formation was selected for the purpose. A general equation thus developed for rich condensate gas in naturally fractured carbonates was applied to the complex of reservoirs existing in the NKJC to study the impact condensate banking of full field performance. Introduction North Kuwait Jurassic is a challenging exploration and development environment that consists of highly complex compartments and heterogeneous reservoirs where natural fractures contribute significantly to the well productivity. Parts of the Jurassic reservoirs consist of very tight matrix with a high density of connected fractures while in other areas fractures are sparse and have limited connectivity. Compositions vary across the complex. Fluid samples from some reservoirs exhibit a dew point pressure behavior (near-critical gas-condensate) while other reservoirs exhibit a bubble point pressure behavior (near-critical volatile oil) (Ghorayeb et al., 2008, 2009). The formation of the condensate in gas codensate reservoirs reduces the liquids content of produced gas. The liquids thus dropped cannot be recovered due to critical saturation limits. The phenomenon therefore, results in a reduction in a loss of oil recovery factor. But, the near well choking or the so called condensate blockage while the overall reservoir pressure is still higher than the dew point will restrict the gas flow hence reducing the producitivity of the well. If the condensate banking behaviors are not understood at the beginning of the development, production performance can be overestimated. This might potentially be a serious problem, since well deliverability of gas codensate reservoirs is critical to meet the long term gas targets in the NKJC. This paper reviews the behavior of condensate formation near the wellbore that results in condensate blockage. We constructed a conceptual single well simulation model with logarithmic grid to investigate grid effect on condensate banking. The investigation aims at selecting an approach to adjust a coarse grid model to match the results of the fine grid model. Different available approaches were used for the purpose namely:productivity index multiplier,skin factor,velocity dependant flow andgeneralized pseudo pressure." @default.
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• W1986009494 date "2009-12-14" @default.
• W1986009494 modified "2023-10-18" @default.
• W1986009494 title "Numerical Investigation of Condensate Banking in the North Kuwait Jurassic Gas Condensate Reservoirs" @default.
• W1986009494 doi "https://doi.org/10.2118/127234-ms" @default.
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