Single-well simulation models were developed covering the stimulated reservoir vol, for both horizontal and vertical wells. Simplified geoL static models from the Siedleczka gas field area were used for the parameterization of the models. Local static numerical models were supplemented with the PVT model and relative permeabilities curves. The simulation anal of the impact of selected parameters on the operation of the gas reservoirs in tight sandstones was carried out. The operations of a single-well system in the variants of completion resulting from the adopted technol of drilling (vertical vs. horizontal) and fracturing the tight reservoir drainage zone (single vertical vs. multiple vertical fractures) were compared.