Abstract: The calculated gas well flowing pressure by integrating material balance equation for gas poor with binonial productivity equa-tion is matched to real flowing pressure curves from production history by modified Gauss-Newton method. Dynamic proved reserves of a gas well in pre-production phase are also estimated. The study shows that the integrated method proposed considering bottomhole pressure change more properly reflcts the dynamic reserves in pre-production phase.

Key words: material balance equation, gas well, performance, reserve