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低渗透气藏由于存在启动压力梯度,气体的渗流不再符合达西定律。考虑启动压力梯度影响,从气体多孔介质渗流力学理论出发,基于低渗透气藏非达西低速稳定渗流微分方程,建立了考虑启动压力梯度影响的低渗透气藏三项式产能方程,并提出了求解方法。通过某气藏的实际资料计算结果表明提出的方法切实可行,计算结果可靠。
Due to the start-up pressure gradient in low-permeability gas reservoirs, gas seepage no longer meets Darcy’s law. Considering the effect of starting pressure gradient, based on the seepage mechanics theory of gas porous media, based on non-Darcy low-velocity steady seepage differential equation of low permeability gas reservoir, a tri-equation productivity equation of low permeability gas reservoir considering the influence of starting pressure gradient is established. Solution. The calculation results of the actual data from a gas reservoir indicate that the proposed method is feasible and the calculation results are reliable.