Summary A two-phase steady-state theory presented by O'Dell and Miller1 and modified later by Fussell2 predicts the performance of single-well gas condensate systems when there is liquid condensate dropout. The proof of this theory is developed with material-balance equations and phase equilibrium concepts. In this proof, dispersion, capillary, and gravity effects are neglected. We also show that this theory can be applied to any two-phase hydrocarbon system (e.g., black oil, volatile oil, or gas condensate) when steady-state conditions exist in the vicinity of a single producing well. Results obtained with this theory are compared with the simulation results obtained with a compositional model. A new procedure to compute the in-place composition profiles for systems under steady-state conditions greatly reduces the computation effort because only the phase equilibrium data for the original reservoir fluid are required. Composition profiles calculated with the proposed procedure are identical to the steady-state composition profiles generated with the compositional model. This theory's usefulness for unsteady flow is also illustrated.
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