In order to solve the problems of low utilization efficiency of injected gas and poor overall benefit in the process of continuous gas lift, mathematic model of gas distribution optimization at the limited gas supply capacity is built and the solving process of analytical solution method is given out.

It is observed that the bigger the supply pressure,the penetrative number and the L/D ratio are,the lower the stability is.

This paper discusses the influence of some weft insertion parameters which includes the nozzles jetting period,the air supply pressure,the initial jetting time of the main nozzle,the breeze of the main nozzle and the pick storer on the weft insertion movement.

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.