低渗透气藏非达西渗流三项式产能方程的建立

Establishment of Trinomial Productivity Equation for Non-Darcy Effect Low Permeability Gas Reservoirs

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。

The gas percolation is not adherence to Darcyrs law due to existence of starting pressure gradient in the low permeability gas reservoir. Based on low permeability gas reservoir with non-Darcy low-velocity seepage differential equation, I establish the low permeability gas reservoir Trinomial equation with consid- eration of starting pressure gradient effect, and present the solving method. The proposed method is feasi- ble and reliable calculation results after the crude data are calculated in a gas reservoir.