Influence of water saturation on CO 2 flooding performance and screening of WAG injection timing in tight reservoirs

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High water saturation in tight reservoirs significantly hinders CO2-oil miscibility and oil-gas mass transfer, leading to increased minimum miscibility pressure and reduced viscosity reduction during CO2 flooding. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Li Liu; Ende Zhan; Yufeng Zhou; Zhiqiang Wang; Fushan Li

doi:10.1080/10916466.2026.2722967

August 27, 2026Petroleum Science and Technology

Influence of water saturation on CO 2 flooding performance and screening of WAG injection timing in tight reservoirs

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Key Points

Determine how water saturation impacts carbon dioxide phase behavior and oil displacement efficiency to optimize water-alternating-gas injection timing in tight reservoirs.
Conducted PVT phase behavior testing and minimum miscibility pressure measurements across varying water saturation states.
Performed microscopic visualization and core flooding displacement experiments under water-alternating-gas conditions using tight reservoir rock samples.
Increasing water saturation from anhydrous conditions to 70% lowered the oil viscosity reduction ratio from 87% to 35%, decreased the volume expansion factor from 1.9 to 1.3, and restricted solution gas-oil ratio increase to ~100 m3/m3.
Raising water saturation from 20% to 70% increased the minimum miscibility pressure from 20.26 MPa to 23.18 MPa.
Microscopic imaging showed CO2 penetrates water films to reach miscibility, but high water saturation inhibits oil-gas mass transfer, leading to delayed gas breakthrough, early water production, and diminished light-component extraction.

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Implication

Experimental study demonstrates elevated water saturation hinders CO2 miscibility and mass transfer in tight reservoirs, suggesting earlier gas injection improves recovery efficiency.

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Liu et al. (2026) studied this question.

synapsesocial.com/papers/6a9299ac8e5d7d1fc0c11b8c https://doi.org/10.1080/10916466.2026.2722967

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Influence of water saturation on CO 2 flooding performance and screening of WAG injection timing in tight reservoirs

Key Points

No abstract yet

Implication

Discussion

Cite This Study

Influence of water saturation on CO 2 flooding performance and screening of WAG injection timing in tight reservoirs

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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