September 5, 2025EnergiesOpen Access

A Study on the Formation Water Retention State and Production Mechanism of Tight High-Water Saturation Reservoirs Based on Micro-Nanofluidic Experiments

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Experiments demonstrate variation in gas-water distribution in tight sandstone gas, indicating complex pore structures' impact.

Micro-nanofluidic experiments revealed that gas-water distribution in tight gas reservoirs varies with pore connectivity.
When the water–gas ratio exceeds 5, formation water type is free; otherwise, it's capillary water, impacting mobilization.
Models with different permeability showed that pore structure significantly affects formation water retention and production mechanisms.
In high-permeability environments, enhanced connectivity facilitates quicker mobilization of formation water phases.

Zhang et al. (2025) studied this question.

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