Well cementation cement slurry gas channeling simulation test device in closed environment and experimental method

The invention relates to the technical field of test equipment, in particular to a gas channeling simulation test device and experimental method.The gas channeling simulation test device for well cementation cement paste in the closed environment comprises a test unit, a gas channeling simulation test unit and a gas channeling simulation test unit, the test unit comprises a test cylinder, a piston, a connecting rod and a fixing piece, and the piston is arranged in the test cylinder in a sliding mode; the fixing piece is installed on the connecting rod and used for controlling movement of the piston, a through hole axially penetrating through the whole connecting rod is formed in the connecting rod, the piston divides the space in the testing cylinder into a rodless cavity and a rod cavity, the lower end of the through hole of the connecting rod is communicated with the rodless cavity, and cement is placed in the rodless cavity; the limitation of the movement of the piston is adjusted through the fixing piece