There are growing UHTP condensate gas reservoirs that have been discovered with the increase of exploration depth of offshore gas reservoir in recent years. The production of condensate water in these HTHP condensate fields increases significantly in the later stage of production， which makes it more difficult to analyze production dynamics and treat surface condensate water. In this study， experiments on the change of PVT water-gas ratio during development and the evaporation of formation water in long cores with decreasing reservoir pressure were conducted for three well areas in the abnormally high-pressure and high-temperature condensate reservoirs in the South China Sea. The difference of the condensate water-gas ratio of the three well areas with the decrease of gas pressure was compared， and the change characteristics of the condensate water-gas ratio obtained by the PVT test and the long core test under the formation temperature were discussed. The mechanism of formation water evaporation in long core simulating reservoir conditions is analyzed， which is higher than that in PVT cylinder. The simulation and prediction method of high-temperature condensate gas reservoir condensate water gas ratio is established and verified. The study shows： The fundamental reason why formation water evaporation in high-temperature and high-pressure condensate gas reservoir is higher than that in PVT cylinder is that the small pore diameter in the reservoir causes the critical properties of each component of condensate gas to deviate under the influence of pore diameter， which not only leads to the contraction of condensate gas in porous media， but also increases the saturated vapor pressure of formation water， resulting in the rise of dew point， and enhancing the mass transfer of formation water to condensate gas. The simulation and prediction method of formation water evaporation in high-temperature condensate gas reservoir can accurately predict the change of condensate water production.
Keywords：High-temperature condensate gas reservoir
;
Condensate water
;
mechanism
;
Water gas ratio
;
Mass transfer
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