BZ19-6凝析气藏超临界强反凝析对气井产能的影响

doi:10.11885/j.issn.1674-5086.2023.07.27.01

摘要/Abstract

摘要： BZ19-6凝析气藏已投入开采的4井区经过近两年的试采，因地层凝析气流体的超临界逆向强反凝析相变特征导致近井区储层伤害及凝析气井产能下降。为了厘清BZ19-6凝析气藏地层流体超临界反凝析相变对气井产能影响机制，综合运用地层流体逆向凝析相态演化实验、储层岩芯反凝析伤害实验测试、凝析气井油气两相渗流动态数值模拟方法，结合超临界流体萃取技术与近临界流体非平衡热力学理论，揭示了BZ19-6凝析气藏地层流体在近井区发生强反凝析时的饱和度分布规律及对气相渗流能力的制约关系，明确了反凝析伤害对气井流入动态的具体影响程度。研究成果可为BZ19-6凝析气藏及同类型凝析气藏的早期试采阶段动态分析、气井合理配产与开发调整提供技术参考。

关键词: 凝析气藏, 超临界态, 逆向反凝析, 相变特征, 凝析气井产能

Abstract: During the two-year production test of the four well sections in the ultra-large BZ19-6 condensate gas reservoir, near-wellbore reservoir damage and productivity decline occurred due to the supercritical reverse strong retrograde condensation behavior of the formation fluid. To clarify the impact mechanism of supercritical retrograde condensation on gas well productivity, this study integrates experimental methods including phase behavior evolution analysis of formation fluids, core damage tests, and numerical simulation of gas-oil two-phase seepage dynamics, combined with supercritical fluid extraction technology and near-critical non-equilibrium thermodynamics theory. The results reveal the saturation distribution of retrograde condensate in the near-well zone and its constraining effect on gas-phase seepage capacity, quantifying the specific impact of condensation damage on well inflow performance. The findings provide technical support for dynamic analysis, rational production allocation, and development adjustment in the early production test stage of the BZ19-6 condensate gas reservoir and similar reservoirs.

Key words: condensate gas reservoir, supercritical state, reverse retrograde condensation, phase change characteristics, condensate gas well productivity

中图分类号:

TE53

蒋维军, 杨志成, 马跃, 张彩旗, 于喜艳, 孙雷, 刘洋. BZ19-6凝析气藏超临界强反凝析对气井产能的影响[J]. 西南石油大学学报(自然科学版), 2025, 47(6): 72-82.

JIANG Weijun, YANG Zhicheng, MA Yue, ZHANG Caiqi, YU Xiyan, SUN Lei, LIU Yang. The Influence of Supercritical Retrograde Condensate on Gas Well Productivity in BZ19-6 Condensate Gas Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(6): 72-82.

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