Abstract
It is a clean, low-carbon energy source for tight gas that has gained popularity in the energy sector for its ability to significantly cut greenhouse gas emissions. On the other hand, low formation pressure, low gas well production, and high water saturation are features of tight gas reservoirs that have been developed and produced over an extended period of time. In order to improve the assessment of the supply boundary and production capacity features of tight gas wells at low pressure, a new coupling model of gas-water two-phase was established in this paper and the threshold pressure gradient, stress sensitivity and slip effect are taken into account the built model. Subsequently, the steady-state substitution method and the material balance method were used to develop the supply boundary calculation model. Finally, an analysis is done on how the supply boundary is affected by the threshold pressure gradient production, stress sensitivity and production pressure difference. The results demonstrate that, in contrast to the slower propagation observed in the matrix zone, the supply boundary propagates relatively quickly within the fracture modification zone. The threshold pressure gradient and stress-sensitive increase the resistance of gas seepage and delay the propagation of the supply boundary, which reduces the production of gas well. The propagation of the supply boundary accelerates with increasing production pressure difference, but the pressure difference's effect decreases. The production of gas is significantly impacted by the threshold pressure gradient, stress sensitivity and production pressure difference. Efficient production of tight gas reservoirs necessitates minimizing water production and preserving formation pressure.