Well Testing in Gas-Condensate Reservoirs


Rajeev R. Lal







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Gas-condensate reservoirs differ from dry-gas reservoirs. Understanding of phase and fluid flow behavior relationships is essential if we want to make accurate engineering computations for gas-condensate systems (e.g., well testing, estimating reserves and predicting production trends). Condensate dropout occurs in the reservoir as the pressure falls below dew-point, as a result of which, the production decreases significantly and the condensate bank formed is also unrecoverable. Hence, the condensate saturation and liquid buildup is very significant in gas-condensate reservoirs. However, it has been observed that the saturation buildup across the reservoir is much more than the maximum equilibrium saturation given by the equilibrium phase behavior of the condensate fluid. This study aimed at understanding the multiphase flow behavior in gas-condensate reservoirs and, in particular, investigated the factors that lead to such high saturation buildup in the reservoir. Changes in the fluid composition due to liquid dropout have also been investigated. In particular, we studied the effect of critical condensate saturation and shapes of relative permeability curves on flow and saturation buildup fluid.

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Copyright 2003, Rajeev R. Lal: Please note that the reports and theses are copyright to their original authors. Authors have given written permission for their work to be made available here. Readers who download reports from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the author, Rajeev R. Lal.

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