适用于凝析气藏压裂的双介质多相多组分渗流模型

含水凝析气藏压裂后，随着生产过程中压力不断降低，地层各个烃类组分不断发生相间传质，并且由于裂缝的存在使得地层流动状态从径向流变为拟径向流或双线性流，凝析气藏形成双重介质多相多组分未饱和流动，需要建立渗流模型来了解产能动态变化。为了计算结果的准确性，当井底流压低于上露点压力时，必须对每个时间步长的压力分布进行判断，确定区域的边界，并对不同的区域采用不同的渗流模型进行计算。基于凝析气藏数值模拟的基本理论，通过高斯积分通量的基本思想对３个不同渗流区域进行了物质平衡与相态变化过程中组分摩尔物质量的综合计算和判断，得到了３个区域在双重介质条件下的渗流模型。对Ｋ-13井的模拟和计算结果表明，模型能较为精确地模拟计算含水凝析气藏压裂后的产能动态变化，具有较强的可靠性、实用性和参考价值。

Duel medium multiphase and multicomponent percolation model suitable to fracture of condensate gas reservoir

The pressure of gas wells after fracturing continues to lower in the process of production interphase mass transfer continues to take place among each hydrocarbon components in the reservoir and since flow stage turns from radial flow into pseudo radial flow or bilinear flow due to the existence of fracture, duel medium, multiphase and multicomponent unsaturation flow takes place in condensate gas reservoirs, thus the percolation model needs to be established to have a full knowledge of productivity performance. In order to get a correct calculating result, when flowing bottom hole pressure is lower than upper dew point pressure, the pressure distribution in each time step should be judged, region boundary should be confirmed and at different pressure regions should be calculated by different percolation models. Based on basic theory of numerical stimulation of condensate gas reservoirs, each component's molar quantities in three infiltration areas are calculated by using the idea of Gaussian fluxes in the process of mass balance and phase behavior change, three percolation models under duel medium at three regions are obtained. The simulation and calculating results of the well K-13 indicate that this model can simulate productivity performance of hydrous gas condensate reservoir and it has strong reliability, practicality and reference value.