碳酸盐岩缝洞型油气藏具有特殊的储集类型和特征,其渗流特征不同于砂岩油气藏,该类油气藏的动态预测研究不能采用砂岩油气藏的渗流理论.基于稳定渗流理论,从缝洞型油气藏的储量计算方法和物质平衡方程为出发点,结合产能方程和井筒压降方程,推导建立了碳酸盐岩缝洞型气藏-水平井井筒的耦合动态预测模型.研究了考虑井筒压降和不考虑井筒压降的2种情况的碳酸盐岩缝洞型气藏的动态特征.研究结果表明:在生产初期,各条酸蚀缝产量和累产量及各个缝洞体系的地层压力下降速度快,后期下降变缓；与不考虑井筒压降情况下相比,考虑井筒压降情况下的各个缝洞体系的地层压力下降速度慢,各条酸蚀缝的产量和累产量小.%The fractured-vuggy carbonate reservoirs has special storage space and reservoir characteristics.The percolation characteristics have different feature with the percolation characteristics of the sandstone reservoirs,and the dynamic prediction method cannot the traditional methods.Based on the steady seepage theory,began with the reserve calculation method and the material balance equation,combining with the productivity equation and wellbore pressure drop equation,a coupling model of formation percolation and wellbore flow was established in the fractured-vuggy carbonate reservoirs,the dynamic characteristics of the fractured-vuggy carbonate reservoirs were analyzed.The result shows indicate that the production and cumulative production of the acid etched fractures and the formation pressure of the fracture-vuggy system decreased quickly in the initial production stages,and which would decrease slowly in the final production stages.The production and cumulative production of the acid etched fractures are less,and the formation pressure of the fracture-vuggy system decrease slowly in the condition of wellbore pressure drop.
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