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凝析气顶油藏气窜特征与常规气顶油藏气窜不同,在气窜过程中,凝析气会发生反凝析,造成凝析油损失,因此,在气窜分析和计算时要采用适当的分析方法。以让纳若尔带凝析气顶油藏开发为例,根据生产气油比和累积产气量的指示曲线,结合测井解释结果,对让纳若尔Γ北油藏进行了凝析气顶的气窜识别及气窜类型分析,确定目前Γ北油藏有10口井发生侧向气窜;考虑到凝析气的反凝析特点,通过对常规气窜程度计算公式的改进,建立了适合凝析气顶气窜程度的计算方法,计算Γ北油藏的10口气窜井中凝析油产量占总产油量的18%,凝析干气产量占总产气量的19%。
The gas channeling characteristics of the condensate gas cap reservoir are different from the gas channeling of conventional gas cap reservoirs. During gas channeling, condensate gas will undergo retrograde condensate, resulting in loss of condensate oil. Therefore, when gas channeling analysis and calculation Use appropriate analytical methods. Taking the development of Najjar with condensate gas cap reservoir as an example, according to the indicator curve of gas-oil ratio and cumulative gas production and log interpretation results, Gas channeling identification and gas channeling type analysis to determine that there are 10 wells in the Γ North reservoir that lateral gas channeling occurs. Taking into account the retrograde condensate characteristics of condensate gas, through the improvement of the conventional gas channeling degree formula, It is suitable for the calculation of the gas migration rate of condensate gas. The output of condensate oil in 10 gas channeling wells in Γ North reservoir accounts for 18% of the total oil production and the condensate dry gas output accounts for 19% of the total gas production.