According to limitation of conventional deliverability testing method applied in gas reservoir of low permeability,a new,reduced well testing method for deliverability test is put forward.

Based on the filtration theory, the deliverability test theory and model are discussed and the relationship between coefficient of the binomial deliverability equation and the penetration rate, depth of pay zones and skin factor are analyzed.

In the lights of the development without deliverability test in gas field, this paper comes up with a kind of new method, which can compute coefficients of deliverability equation for gas wells,on the basis of on the data of stable production and well-controlled reserves.

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.

Nowadays, the main method of determining oil and gas well deliverability is steady well test, that is back-pressure testing, isochronal testing, revisionary isochron test and single-point test.