PHYSICAL SIMULATION EXPERIMENTAL DEVICE AND METHOD FOR WATER INVASION AND GAS PRODUCTION BY WATER DRAINAGE IN GAS RESERVOIRS

The invention provides a physical simulation experimental device and method for water invasion and drainage gas recovery in gas reservoir, and the experimental device includes: a heterogeneous reservoir model having a first core holder and a second core holder, wherein an inlet end of the first core holder is connected to an inlet end of the second core holder by an inlet pipeline, an outlet end of the first core holder is connected to an outlet end of the second core holder by an outlet pipeline, a third core holder is connected between a middle portion of the first core holder and a middle portion of the second core holder, and a fourth core holder is connected to the outlet pipeline; a gas injection mechanism having a gas injection bottle and a gas injection cylinder, the gas injection cylinder being connected to the inlet pipeline; a water body simulation mechanism having a water storage tank and a water injection pump, the water storage tank being connected to the inlet pipeline. The invention can continuously perform the physical simulation experiment for water invasion and drainage gas recovery in gas reservoir, simulate and reveal different drainage gas recovery modes, timings, scales and their influences on the recovery ratio of the gas reservoir.