Abstract: This study involved building a seepage model of a gas reservoir under the presumption of stress sensitivity, gas slippage effect, and high-speed non-Darcy flow to study the development characteristics of the fracture-porosity-type dual media gas reservoir. The influence of different seepage effects on the gas well was analyzed through numerical simulation methods. The results indicated that the production features of the dual media gas reservoir were basically in line with those of the equivalent homogeneous gas reservoir when the interporosity flow coefficient greater than or equal to 10^-6, Consequently, the theories and methods of analyzing the equivalent homogeneous gas reservoir can be applied to study the dual media gas reservoir. At the early stage of gas well production, the stress sensitivity had little influence on the pressure drop of the pit bottom and variation in the production plateau. The effect of the stress sensitivity is enhanced at the mid-late stage. Theoretically, the influence of the stress sensitivity on the pressure drop of the pit bottom was observed earlier with the decrease in the interporosity flow coefficient, and its effect on the production plateau became greater. The high-speed non-Darcy flow had little influence on the pressure drop of the pit bottom at the early stage of the gas well production, and the influence increased at the mid-late stage. Theoretically, the influence of the high-speed non-Darcy flow on the pressure drop of the pit bottom was observed earlier with the decrease in the interporosity flow coefficient. Its effect on the production plateau also became greater. The slippage gas effect existed in the fracture-porosity-type dual media gas reservoir, but was only slight because of the reservoir and the bottom hole pressure that was comparatively higher.

Key words: fracture-porosity type, dual media gas reservoir, volcanic gas reservoir, stress sensitivity, gas slippage effect, highspeed non-Darcy flow