Experiments on Water-Gas Flow Characteristics under Reservoir Condition in a Sandstone Gas Reservoir

For gas reservoirs that contain water, investigating characteristics of water–gas seepage is crucial to the formulation field development plans and predicting production capacity water breakthrough wells. purposes such an investigation, process invasion into a water-containing reservoir was studied based on four sandstone samples whose physical properties differed quite vastly (permeability: 0.112–192.251 mD; porosity: 8.33–20.60%). Gas–water relative permeability experiments were conducted gas-driven in conditions (temperature: 135 °C; pressure: 75 MPa). Starting with samples’ microstructural characteristics, particular attention paid impacts throat radius clay content characteristics. It found basic properties, microscopic mineral composition all affected The larger pore-throat radius, stronger ability allow fluid through under same saturation greater phases. Furthermore, wider lower content, gas–water permeability. Isotonic irreducible be negatively positively content. When have similar average times larger, its decreased by 1.63%, residual 1.00%, increases more than 400 times. Water intrusion showed significant impact flow low-permeability samples, it severely restricted phase.