Effect of the Codetermined Seepage Ability by Varying Hydrate Saturation and Rock-Matrix Permeability on Depressurized Gas Coproduction in Hydrate Reservoir with an Underlying Free-Gas Layer

ACS Omega, Год журнала: 2025, Номер 10(17), С. 17794 - 17806

Опубликована: Апрель 25, 2025

Within hydrate reservoir, depressurization in the underlying free-gas layer could facilitate efficient gas coproduction, provided that its overall seepage ability is conducive to pressure propagation. Such codetermined by saturation (S H) and rock-matrix permeability (k), varies across different reservoirs even at locations of same reservoir. In this study, we designed an experiment/simulation integrated approach investigate effect varying on depressurized coproduction. The experiment reveals under conditions moderate H = 0.19) low (k 1.5 mD), coproduction rate initially increased quickly, followed a gradual decrease until eventual stabilization. prediction results coupled Thermo-Hydro-Chemical model with carefully specified parameters can match well experimental measurements. simulated spatiotemporal evolution S whole reactor demonstrates propagates preferentially layer, then gradually vertically upward into overlying hydrate-bearing causing slow dissociation. Thus, initial rapid production mainly dominated free production, while low-rate stage controlled Raising high level (0.40) only further suppresses propagation within without significantly reducing peak rate. Comparatively, increasing k (25 mD) facilitates throughout several-fold increase However, case, dissociation excessive consumption reservoir's latent heat, thereby driving force for sustained ultimately constraining during subsequent stage.

Язык: Английский

Geomechanical Insights into CO2 Sequestration with Water Extraction: Surface Deformation and Sand Production

Energy, Год журнала: 2025, Номер unknown, С. 136396 - 136396

Опубликована: Май 1, 2025

Язык: Английский