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通过数值模拟某凝析气藏单井产出特征 ,定量研究反凝析液对产能的影响。将数值模拟结果与油藏工程产能分析进行对比 ,结果表明 :反凝析液对产能影响严重 ,对于中高凝析油含量的凝析气藏 ,由反凝析作用引起的产能损失可达 2 0 %以上 ,主要由于反凝析液占据了多孔介质表面而使储集层渗透率降低 ,同时反凝析液相的出现和参与流动使气相的相对渗流能力变小。给出了在此情况下的产能方程修正公式 ,可用于对常规的产能方程进行校正。控制反凝析液析出是提高凝析气藏开采效果的关键。图 1表 2参 4
Through the numerical simulation of single well output characteristics of a condensate gas reservoir, quantitative analysis of the impact of retrograde condensate on capacity. Comparing the numerical simulation results with the productivity analysis of reservoir engineering, the results show that the counter-condensate has a serious impact on the productivity. For condensate gas reservoirs with medium-high condensate content, the productivity loss caused by the counter-coagulation can reach 20 %, Mainly due to the anti-condensate occupy the surface of the porous media so that the permeability of the reservoir decreases, while the presence of counter-condensate liquid phase and participate in the flow of the relative permeability of the gas phase becomes smaller. The formula for correction of capacity equation in this case is given, which can be used to correct the conventional capacity equation. Control of anti-condensate precipitation is to improve the condensate gas production of the key. Figure 1 Table 2 Reference 4