ENHANCEMENT OF CONDENSATE RECOVERY FACTOR FROM DEPLETED GAS CONDENSATE FIELDS

Abstract

The efficiency of gas condensate fields additional development at the final stage was investigated. The feature of condensed hydrocarbon production at low reservoir pressures is analyzed and the effectiveness of methods for increasing condensate recovery from depleted gas condensate fields is considered. The theoretical model of the simplified depleted gas condensate field with homogeneous volume and reservoir properties is developed. The study involves processes of the gas condensate recovery from depleted gas condensate fields enhancement through the injection of dry hydrocarbon gas, nitrogen, carbon dioxide gas into a bed, fringe of the propane-butane fraction with its transfer along the bed through nitrogen and by flooding are investigated using the hydrodynamic simulator Eclipse 300. The effectiveness of various placements of injection wells and the active reservoir water effect on the gas condensate field exploitation are outlined. The research proved that the placement of injection wells in the contour zone is the most effective when reservoir water active contour is available. In general, the introduction of methods for condensate recovery enhancement in gas condensate fields with high level of condensate should be carried out from the beginning of the field exploitation to prevent the loss of hydrocarbons because of retrograde condensation. The effect of introducing methods for the condensate recovery enhancement is relatively inconsiderable in the depleted gas condensate fields. Carbon dioxide turned out to be displacing agent. Its injection in the contour part of the field is recommended, in particular, this value will be even higher if the active water bed is not available.