Abstract: The effects of high pressure and reservoir rock stress sensitivity on super-high gas reservoir productivity are considered, the new productivity equations are deduced and the method for determination of the coefficient and the absolute open flow potential or deliverability are presented. Field application and appraisal result show that the deliverability given by this new method is 10%~25% lower than that by the conventional method, but comparable with that by pressure-squared method without regard to the stress sensitivity. This paper suggests that when making productivity appraisal of super-high pressure and stress sensitivity gas reservoir during early phase of exploration or development, the pressure-squared method can be used to approximately determine the absolute open flow potentials of gas reservoirs.

Key words: high pressure gas reservoir, stress sensitivity, productivity prediction, open flow potential, deliverability, appraisal, evaluation