New Method for Calibrating Recovery of Gas Condensate Reservoirs Based on PVT Experiments
There are two differences between constant volume depletion(CVD)experiments and real depletion of gas condensate reservoirs:The CVD experiment is performed starting from the dew point,while the initial pressure of a gas condensate reservoir is usually greater than the dew point;The pressure reduction and gas production are carried out alternately in CVD experiments.In contrast,the pressure is decreased simultaneously as gas is produced during the real depletion process.It is found that the above two differences have little impact on predicting dry gas recovery rates,but can lead to significantly lower calibration of condensate recovery rates based on CVD experiments.In order to improve the prediction of condensate recovery in CVD experiments,a new method for calibrating the recovery of gas condensate reservoirs based on CVD experiments is established by considering the differences between the initial reservoir pressure and the dew point and combining the two-phase pressure decline equation,condensate oil production equation,and definition of fluid volume at standard condition.This new method works well in real cases and is of great significance to the recovery prediction of gas condensate reservoirs.
gas condensate reservoirconstant volume depletion(CVD)experimentcondition differencerecovery efficiency
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