Based on the research and application of brought-in gas well classification in the past,proposing out studying classification of brought-in gas wells using the fuzzy cluster analysis method of fuzzy mathematics.

Aimed at the stress sensitivity which exists in view of the gas reservoirs performance history,the stress sensitive effect on gas well productivity is discussed from the angle of gas reservoir engineering.

The productivity prediction equations of conventional gas reservoirs are commonly used to estimate the gas well productivity in low-permeability gas reservoirs at present, without consideration of the threshold pressure gradient, resulting in large discrepancy between the calculations and production realities.