Abstract: Retrograde condensed liquid tends to being dropped oul during development of condensate gas reservoirs, thus showing different Alowing characteristics between reservoir percolation and dry gas drive or depletion gas drive. Up to now. most predictions of in-flow performance of a condensate gas well are based on singlc phase gas reduccd me:lhod. However, heoretical and field application indicatc that such a method muy give rise to greater errors owing to ignoring the effect of retrograde condensed liquid precipitation on relative permeability to gas. Although subslautial theoretical sludies have been made,its application still is restrained by ils complcxity and/ or absence o[ strict/ overall theoretical description. 'This paper, on the basis of oil-gas two phase percolation theoty, presents equation of psendo-steady state in-flow perfomance and striet verificalion of calculalions of reservoir distribution parameters. Applied cases show that adopting this equation of IW)-phase in-flow perfor-mance could help more proper estimation of condensate gas productivity and recognition of the reservoir performance.

Key words: condensate gas well, relative permeability, saturation, productivity, performance