In order to increase single-well productivity and improve development economics of low porosity and low permeability gas reservoirs

many production wells adopt the way of commingled production.By laboratory physical experimental analysis

the development process of commingled production was simulated to study the influences of seepage features of gas reservoir under the combined action of formation pressure

permeability and the main controlling factors on the development effect

and also the timing of production conversion.The results suggest that when commingled production is adopted in gas reservoirs

the yield contribution rate of high pressure and high permeability layers is always higher than that of low pressure and low permeability layers;As for low pressure and high permeability layers

their yield contribution rate is higher than that of high pressure and low permeability layers in the initial phase of the experiment

and they turn from the primary gas pay zones to the secondary gas pay zones in the later phase;Along with the pressure at the conversion points going down

the degree of reserve recovery presents a decreasing trend among different times of production conversion;the effect of production conversion of low permeability layers is better than that of high permeability layers.This is still a new attempt to analyses the seepage features of commingled production through physical simulation experiment and the results provide a reference for making a reasonable development technology strategy for similar gas reservoirs.