Gas Condensate PVT A worked example to estimate Condensate and gas recovery from a gas condensate reservoir produced by depletion CGR as a function of reservoir pressure The calculations use results from CCE and CVD experiments. The results assume no aquifer influx and ignore the effect of rock and water compressibility. They also assume that the condensate phase is immobile in the reservoir. This is a reasonable assumption for almost all gas condensate fluids (except in the near-well region, and this does not affect ultimate recovery).

Statement of problem Initial reservoir pressure = 5000 psig Estimate the fractional recovery of oil and condensate, assuming that the reservoir pressure at abandonment = 1200 psig. Define recoveries in terms of volumes at standard conditions. Assume that the ‘condensate’ is the C6+ fraction of the reservoir fluid. Which data have the most impact on liquid recovery and gas recovery? Estimate the producing CGR as a function of reservoir pressure. PVT data for this problem are taken from the 3rd SPE Comparative Solution Project

PVT Data - CCE Dew point pressure = 3428 psig Spreadsheet with measured data

PVT Data - CVD Assume that C6 MW = 86, and C6 SG = 0.659