A Novel Method for the Quantitative Evaluation of Retrograde Condensate Pollution in Condensate Gas Reservoirs

Zhao, Hongxu; Zhang, Xinghua; Gao, Xinchen; Chen, Peng; Guo, Kangliang

doi:10.3390/pr12030522

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…The focus of the research in this paper is horizontal wells. Horizontal wells can increase the contact area with the reservoir and reduce the production differential pressure, so horizontal wells have the effect of reducing the formation of condensate in the near-well region in condensate reservoirs [24,[28][29][30][31][32].…”

Section: Afidick Et Al Conducted a Constant Component Expansion (Cce)...mentioning

confidence: 99%

Calculation Method of Three-Phase Productivity of Horizontal Well in Water-Bearing Condensate Gas Reservoir

Zhang,

Chen,

et al. 2024

Energies

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Condensate gas reservoirs are a special kind of reservoir because of the presence of multiphase flow in their production. The accurate calculation of the multiphase flow productivity in horizontal wells is of great significance for reservoir development. In this study, the total pseudopressure and the equivalent total flow are defined to solve the multiphase nonlinear problem in the oil–gas–water three-phase control flow equation, and to establish a three-phase productivity equation considering the non-Darcy effect. It provides a solution for the three-phase productivity calculation of horizontal wells in water-bearing condensate gas reservoirs. The example verification and error analysis of three horizontal wells, except for the gas production error of Well Y3 and the average error of the production data of other gas wells, is below 4%. The fitting effect of Well Y2 is better than that of the other two horizontal wells, and the average error of the oil, gas, and water phases is below 3%. This method provides a practical and simple engineering tool for the analysis of the productivity of condensate gas reservoirs considering multiphase flow.

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Section: Afidick Et Al Conducted a Constant Component Expansion (Cce)...mentioning

confidence: 99%

Calculation Method of Three-Phase Productivity of Horizontal Well in Water-Bearing Condensate Gas Reservoir

Zhang,

Chen,

et al. 2024

Energies

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Gas Recycling Optimization in Gas Condensate Reservoirs Using 3D Compositional Modeling

Kasem,

Khattab,

Wahba

2024

Preprint

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Gas condensate reservoirs present unique production challenges due to condensate dropout in reservoir pores when the pressure drops below the dew point. This immobile condensate accumulation reduces well productivity. Dry gas recycling is a widely recognized enhanced production technique to mitigate this issue and maximize condensate recovery. This study employs a three-dimensional compositional model to optimize condensate recovery by varying the gas recycling ratio in reservoirs of different qualities and gas compositions (with varying condensate yields). The analysis considers both vertical and horizontal production well configurations. Initially, a depletion scenario was modeled with five wells producing under natural depletion as the base case. Subsequently, a dry gas recycling process was applied with recycling ratios ranging from 0 to 1, achieved by converting one producer into an injector in a crestal injection pattern. Horizontal wells were also introduced to evaluate the impact of well geometry on recovery performance. The findings indicate that the optimum dry gas injection ratio increases with higher condensate yields. Specifically, the optimal ratio rises from 50% for gas with a condensate yield of 20 STB/MMSCF to 75% for gas with 60 STB/MMSCF. Additionally, reservoir quality and well geometry significantly influence performance. For high-quality reservoirs, horizontal wells outperform vertical wells for high-condensate-yield gas reservoirs. While for low-quality reservoirs: Vertical wells are more effective than horizontal wells for high-condensate-yield gas reservoirs. These results provide guidelines for optimizing dry gas injection ratios across a wide range of reservoir qualities and gas yield contents to maximize recovery.

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The Impact of Condensate Oil Content on Reservoir Performance in Retrograde Condensation: A Numerical Simulation Study

Tu,

Zhang,

Guo

et al. 2024

Energies

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This study investigates the complex dynamics of retrograde condensation in condensate gas reservoirs, with a particular focus on the challenges posed by retrograde condensate pollution, which varies in condensate oil content and impacts on reservoir productivity. Numerical simulations quantify the distribution of condensate oil and the reduction in gas-phase relative permeability in reservoirs with 100.95 g/m3, 227.27 g/m3, and 893.33 g/m3 of condensate oil. Unlike previous studies, this research introduces an orthogonal experiment to establish a methodology for studying the dynamic sensitivity factors across different types of gas reservoirs and various development stages, systematically evaluating their contributions to condensate oil. The analysis reveals that reservoirs with low to moderate condensate oil content gradually experience expanding polluted regions, affecting long-term production. The maximum condensate saturation near the wellbore can reach 0.19, reducing gas-phase relative permeability by about 25.44%. In contrast, high-condensate oil reservoirs show severe early-stage retrograde condensation, with saturations up to 0.35 and a permeability damage rate reaching 73%. The orthogonal experiments identify reservoir permeability and condensate oil content as critical factors influencing production indicators. The findings provide key insights and practical recommendations for optimizing production strategies, emphasizing tailored approaches to mitigate retrograde condensation and enhance recovery, especially in high-condensate oil reservoirs, offering theoretical and practical guidance for improving reservoir management and economic returns.

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A Novel Method for the Quantitative Evaluation of Retrograde Condensate Pollution in Condensate Gas Reservoirs

Cited by 3 publications

References 24 publications

Calculation Method of Three-Phase Productivity of Horizontal Well in Water-Bearing Condensate Gas Reservoir

Calculation Method of Three-Phase Productivity of Horizontal Well in Water-Bearing Condensate Gas Reservoir

Gas Recycling Optimization in Gas Condensate Reservoirs Using 3D Compositional Modeling

The Impact of Condensate Oil Content on Reservoir Performance in Retrograde Condensation: A Numerical Simulation Study

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