基于流动物质平衡理论的凝析气藏动态储量计算方法

doi:10.13809/j.cnki.cn32-1825/te.2025.01.012

摘要/Abstract

摘要：

凝析气藏衰竭过程会发生显著凝析现象，现有物质平衡方法计算凝析气藏动态储量时，压降曲线不呈现线性关系导致动态储量评价存在困难，因此，研究复杂多相流气藏物质平衡储量计算方法具有重要意义。依据凝析气藏渗流力学理论，引入油气两相拟压力参数，建立了基于流动物质平衡理论的凝析气藏动态储量计算新方法，多相流动物质平衡法中规整化产率与规整化累计产量呈现明显的线性关系。分析结果认为，当生产未达到拟稳态时，计算得到的动态储量结果会存在偏差。研究凝析气藏在不同流动阶段饱和度变化规律的差异，形成了油气两相拟压力参数的计算方法，修正的生产指示曲线能够提高凝析气藏动态储量计算的准确性。方法应用于某凝析气藏现场实例，与常规方法和Blasingame图版拟合方法的对比计算结果认为新方法计算得到动态储量结果更为准确。结果表明新计算方法提高了凝析气藏动态储量评估的准确性，有助于指导现场及时调整开发方案。

关键词: 凝析气藏, 动态储量, 多相渗流, 流动物质平衡, 拟压力

Abstract:

The depletion process of a gas-condensate reservoir is characterized by significant condensation phenomenon. Existing material balance methods often fail to establish a linear relationship between pressure drop and cumulative production, resulting in considerable errors in dynamic reserve evaluations. Therefore, it is crucial to study material balance methods tailored for complex multiphase flow gas reservoirs. Based on the fluid flow poromechanics of gas-condensate reservoirs, a new method for calculating dynamic reserves in gas-condensate reservoirs was established by introducing two-phase pseudo-pressure parameter and applying flowing material balance theory. In the multiphase flowing material balance method, a clear linear relationship was observed between the normalized production rate and normalized cumulative production. The analysis results showed that when the production did not reach the pseudo-steady state, the calculated dynamic reserve results would be biased. By analyzing the differences in saturation behavior across various flow regimes, a calculation method for the two-phase pseudo-pressure parameter was developed. The modified production indication curve could improve the accuracy of dynamic reserve calculations for condensate gas reservoirs. The method was applied to wells in a gas-condensate reservoir. Compared with conventional methods and the Blasingame chart fitting method, the proposed approach yielded more accurate dynamic reserve evaluations. The results demonstrate that the proposed calculation method enhances the accuracy of dynamic reserve evaluations for gas-condensate reservoirs and supports timely adjustments to development plans in the field.

Key words: gas-condensate reservoirs, dynamic reserves, multiphase flow, flowing material balance, pseudo-pressure

中图分类号:

TE372

赵令博,段永刚,罗乐等. 基于流动物质平衡理论的凝析气藏动态储量计算方法[J]. 油气藏评价与开发, 2025, 15(1): 96-102.

ZHAO Lingbo,DUAN Yonggang,LUO Le, et al. Dynamic reserve calculation method for gas-condensate reservoirs based on flowing material balance theory[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(1): 96-102.

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生产时长/d	动态储量计算结果/（10⁸m³）
200	3.1
400	14.0
600	19.5
800	20.3