Speaker
Description
Aquifer gas storage experiences cyclic gas–water displacement during cushion-gas build-up and subsequent withdrawal. Field performance commonly shows cycle-by-cycle working-gas loss, deliverability fluctuations, and evolving water-encroachment risk. Conventional two-phase models often prescribe fixed drainage and imbibition hysteresis branches for relative permeability and capillary pressure, which cannot capture the history dependence created by repeated interfacial reconfiguration and changing wettability conditions.This study presents a cycling–wettability-lag–hysteresis framework in which wettability lag is the primary driver of hysteresis evolution and, consequently, residual gas accumulation under repeated cycling. The approach couples the drainage-dominated gas invasion during build-up with the imbibition-dominated water re-invasion during production through a cycle-aware state tracking strategy that records saturation trajectories and reversal history to update flow functions. Hysteresis is reformulated as a drifting hysteresis surface that migrates with cycling and interface renewal rather than remaining a fixed loop. The framework links wettability-lag-controlled drift to progressive residual-gas trapping and declining gas-phase flow capacity, providing a mechanistic explanation for long-term parameter drift and performance degradation. A regime-oriented interpretation is outlined to relate operational intensity and buoyancy and mobility effects to outcomes including residual gas buildup, water-seal strengthening, and gas-channeling tendency.
| Country | China |
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