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通过对气井产能方程以及采气指示曲线的分析可知 :为充分利用地层能量 ,采气指示曲线的上翘点 (直线段末端 )所对应的产量即为气井的合理产量 ,流速即为临界流速。其结果为岩心的临界流速计算气井的合理产量提供了理论依据。在实验室中 ,测量出川西地区 2 4块岩心样品的临界流速 ,并据此计算出该地区气井的合理产量。气井的合理产量与储层有效厚度、渗透率、孔隙度关系密切 ,通过曲线拟合给出了该地区气井合理产量与有效厚度、渗透率、孔隙度的关系式。
Through the analysis of gas well productivity equation and gas indication curve, we can see that in order to make full use of formation energy, the corresponding output of the upturn point (end of straight line) of the gas production curve is the reasonable output of gas well, and the flow rate is the critical flow rate. The results provide a theoretical basis for calculating the reasonable production of gas wells for the critical flow velocity of the core. In laboratory, the critical flow velocity of 24 core samples in western Sichuan was measured, and the reasonable output of gas wells in this area was calculated. The reasonable production of gas wells is closely related to the effective thickness, permeability and porosity of reservoirs, and the relationship between the reasonable output of gas wells and effective thickness, permeability and porosity in this area is given by curve fitting.