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Gas Injection Gravity Miscible Displacement Development of Fractured-Vuggy Volatile Oil Reservoir in the Fuman Area of the Tarim Basin

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Listed:
  • Xingliang Deng

    (Tarim Oilfield Company, PetroChina, Korla 841000, China
    R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation, Korla 841000, China)

  • Wei Zhou

    (PetroChina Research Institute of Petroleum Exploration &Development, China National Petroleum Corporation, Beijing 100086, China)

  • Zhiliang Liu

    (Tarim Oilfield Company, PetroChina, Korla 841000, China
    R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation, Korla 841000, China)

  • Yao Ding

    (Tarim Oilfield Company, PetroChina, Korla 841000, China
    R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation, Korla 841000, China)

  • Chao Zhang

    (Tarim Oilfield Company, PetroChina, Korla 841000, China
    R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation, Korla 841000, China)

  • Liming Lian

    (PetroChina Research Institute of Petroleum Exploration &Development, China National Petroleum Corporation, Beijing 100086, China)

Abstract

This study investigates gas injection gravity miscible flooding to enhance oil recovery in fractured-vuggy volatile oil reservoirs of the Fuman area, Tarim Basin. The Fuman 210 reservoir, containing light oil with high maturity, large column heights, and strong fracture control, provides favorable conditions for gravity-driven flooding. Laboratory tests show that natural gas and CO 2 achieve miscibility, while N 2 reaches near-miscibility. Mixed gas injection, especially at a natural gas to nitrogen ratio of 1:4, effectively lowers minimum miscibility pressure and enhances displacement efficiency. Full-diameter core experiments confirm that miscibility improves oil washing and expands the sweep volume. Based on these results, a stepped three-dimensional well network was designed, integrating shallow injection with deep production. Optimal parameters were determined: injection rates of 50,000–100,000 m 3 /day per well and stage-specific injection–production ratios (1.2–1.5 early, 1.0–1.2 middle, 0.8–1.0 late). Field pilots validated the method, maintaining stable production for seven years and achieving a recovery factor of 30.03%. By contrast, conventional development relies on depletion and limited water flooding, and dry gas injection yields only 12.6%. Thus, the proposed approach improves recovery by 17.4 percentage points. The novelty of this work lies in establishing the feasibility of mixed nitrogen–natural gas miscible flooding for ultra-deep fault-controlled carbonate reservoirs and introducing an innovative stepped well network model. These findings provide new technical guidance for large-scale application in similar reservoirs.

Suggested Citation

  • Xingliang Deng & Wei Zhou & Zhiliang Liu & Yao Ding & Chao Zhang & Liming Lian, 2025. "Gas Injection Gravity Miscible Displacement Development of Fractured-Vuggy Volatile Oil Reservoir in the Fuman Area of the Tarim Basin," Energies, MDPI, vol. 18(19), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:19:p:5317-:d:1767262
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    References listed on IDEAS

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    1. Yongfeng Zhu & Yintao Zhang & Xingxing Zhao & Zhou Xie & Guanghui Wu & Ting Li & Shuai Yang & Pengfei Kang, 2022. "The Fault Effects on the Oil Migration in the Ultra-Deep Fuman Oilfield of the Tarim Basin, NW China," Energies, MDPI, vol. 15(16), pages 1-15, August.
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