The Influence of Supercritical Retrograde Condensate on Gas Well Productivity in BZ19-6 Condensate Gas Reservoir

doi:10.11885/j.issn.1674-5086.2023.07.27.01

Abstract

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

CLC Number:

TE53

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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