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To enhance the condensate oil recovery of BL condensate gas reservoir in the late stage of depletion development and solve the retrograde condensate loss caused by lower reservoir pressure than dew point pressure, this paper carries out PVT phase experiment and simulation to develop a method for researching the phase behaviors of BL condensate gas reservoir with injected CO2. The feasibility and effectiveness of CO2 injection to improve the recovery percent of condensate oil of BL condensate gas reservoir are analyzed. The retrograde condensate oil is reproduced under the current reservoir pressure in the laboratory, and then its chromatographic components, phase behaviors and P–T diagram are determined. The gas injection expansion experiment, multi-contact extraction experiment and gas injection extraction experiment are carried out on retrograde condensate oil. The phase behavior mechanisms of CO2 injection into BL condensate gas reservoir in inhibiting retrograde condensate loss, reducing the retrograde condensate oil saturation and inducing phase inversion of condensate oil are analyzed. Finally, the suitable CO2 injection development mode is suggested. The research results provide reference and basis for the production improvement of BL condensation gas reservoir.

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Study on Phase Behaviors of Near-Critical Condensate Gas Reservoir During CO2 Injection in the Late Stage of Depletion Development

  • 会议论文

  • 发表日期：

    2025年

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  • Li-jian Li,
  • Xiu-wei Wang,
  • Tairan Liang,
  • Yuan-shu Li,
  • Hai-chao Wang,
  • Hua-yan Li,
  • Wen-yong Zuo,
  • Jie Zhen,
  • Peng Xu

摘要

To enhance the condensate oil recovery of BL condensate gas reservoir in the late stage of depletion development and solve the retrograde condensate loss caused by lower reservoir pressure than dew point pressure, this paper carries out PVT phase experiment and simulation to develop a method for researching the phase behaviors of BL condensate gas reservoir with injected CO2. The feasibility and effectiveness of CO2 injection to improve the recovery percent of condensate oil of BL condensate gas reservoir are analyzed. The retrograde condensate oil is reproduced under the current reservoir pressure in the laboratory, and then its chromatographic components, phase behaviors and P–T diagram are determined. The gas injection expansion experiment, multi-contact extraction experiment and gas injection extraction experiment are carried out on retrograde condensate oil. The phase behavior mechanisms of CO2 injection into BL condensate gas reservoir in inhibiting retrograde condensate loss, reducing the retrograde condensate oil saturation and inducing phase inversion of condensate oil are analyzed. Finally, the suitable CO2 injection development mode is suggested. The research results provide reference and basis for the production improvement of BL condensation gas reservoir.