COMPARISON RESEARCH BETWEEN OIL AND GAS RELATIVE PERMEABILITIES OF QIAOKOU CONDENSATE GAS RESERVOIR IN THE DONGPU DEPRESSION OF THE BOHAI BAY BASIN
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摘要: 渤海湾盆地东濮凹陷桥口气藏是典型的凝析气藏,开采过程中凝析油气在地层中渗流复杂,生产压差、气井产能、采收率等开发指标预测难度较大。针对上述问题,选用桥口气藏岩心,采用稳态法分别测试常规油气相渗、平衡油气相渗以及降压过程凝析油气相渗特征,并对测试结果进行对比分析。凝析油气相渗曲线与常规相渗曲线相比,表现出低界面张力的特征,反映凝析油气比常规油气在地层中更易流动。应用油藏模拟软件,分别采用常规相渗曲线和平衡油气相渗曲线,预测了桥口气藏油气采收率。与岩心衰竭实验对比,平衡油气相渗曲线模拟结果较好地反映了凝析油气在地层中渗流情况以及气藏的采收率。Abstract: Qiaokou gas reservoir is a typical condensate one in the Dongpu Depression of the Bohai Bay Basin.Condensate oil/gas has complicated seepage flow in strata during the process of production,so the development parameters,such as producing pressure drop,gas well productivity,recovery efficiency and so on are not easy to predict.Focusing on above problems,the paper selected the rock cores of Qiaokou gas reservoir and adopted stable state methods to test relative permeability feathers of conventional,balance condensate,condensate in decompression process respectively.The comparative analysis results indicate that condensate oil/gas system presented feathers of low interfacial tension and more easily flow than conventional oil/gas.The paper predicted the oil/gas recovery efficiency of Qiaokou reservoir by applying pool simulation software and using conventional and balance relative permeability curves respectively.Compared with condensate oil in core experiment,the simulation result of balance oil/gas relative permeability curve can better reflect fluid flow of condensate oil/gas in strata and recovery efficiency of gas reservoir.
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