Influence of reservoir lithology on porous flow resistance of gas-bearing tight oil reservoirs and production forecast

Abstract The release of dissolved gas during the development gas-bearing tight oil reservoirs has a great influence on effect development. In this article, high-pressure mercury intrusion experiment was carried out in cores from different regions and lithologies Ordos Basin Sichuan Basin. objectives are to study microscopic characteristics porous throat structure these analyze flow resistance laws lithology by conducting gradient test experiment. A mathematical model is established production index corrected according results predict production. experimental show that for same area lithology, lower permeability under back pressure, greater gradient. And sandstone areas, gradients have little difference changes coefficients similar. However, limestone conditions supports much higher than reservoirs. Furthermore, consistent with theoretical analysis indicating PVT (pressure–volume-temperature) nanoscale pores those measured high-temperature, sampler. Only when pressure less certain value bubble point will begin separate generate resistance. This high-temperature calculation heterogeneity mismatch fluid storage space make resistance, generated separation gas, impact