Low permeability gas reservoirs with edge and bottom water are easy to form
gaswater twophase flow and cannot accurately predict the productivity of waterproducing gas wells. Based on the typical percolation
characteristics of low permeability gas reservoirs, considering the influence of water production of gas wells and the singlephase percolation
characteristics of fractured gas wells, a formula for calculating gaswater twophase productivity of fractured gas wells in low permeability
gas reservoirs was established. Then combining with the gaswater twophase permeability curve, the generalized pseudopressure of gaswater
twophase and the gaswater twophase percolation coupling model of straight wells fractured were obtained. The calculation result of a gas
well in southeastern of Jiangsu shows that the absolute open flow rate calculated by the linear regression equation was 33709×104 m3/d
and the absolute open flow rate calculated by the new model was 32919×104 m3/d. Compared with the productivity test results, the absolute
and relative errors of result calculated by the new model were only 0079×104 m3/d and 234%, which verified the accuracy and applicability
of the new model. In addition, the effects of starting pressure gradient, stress sensitivity index, watergas volume ratio, halflength of
fracture and fracture conductivity on the inflow performance of fractured gas wells were also analyzed in this paper, which provided a new idea
for the productivity study of gaswater twophase fractured gas wells in low permeability gas reservoirs.