EXPERIMENTAL SYSTEM AND METHOD FOR INTEGRATED SIMULATION OF SAND PRODUCTION AND REFORMATION OF NATURAL GAS HYDRATE RESERVOIRS AROUND WELLS

The present disclosure relates to an experimental system and a method for simulating a 5 sand production process and reformation of a hydrate reservoir around wells. The experimental system includes a reactor, a gas-liquid mixed displacement and control sub-system, an overburden servo control sub-system, and a gas-solid-liquid separation sub-system. The reactor includes a top flange, a bottom flange, a ring-shaped metal frame, an overpressure piston, and a central well shaft. The top flange, the ring-shaped metal frame, and the bottom flange are 10 stacked along a top-down direction and are connected by evenly distributed screw rods. The overpressure piston is T-shaped, and a top of the overpressure piston is configured within the chamber of the reactor. A bottom of the overpressure piston passes through the bottom flange. A middle of the overpressure piston is configured with a fluid outlet passing through the reactor. The central well shaft is installed in the fluid outlet. Through the integrated application of the 15 reactor and the above system, the characteristics of the pore structure, the evolution of the fluid pressure in the process of sand production, and reformation in the decomposition zone of the hydrate reservoir can be observed. Thus, the migration of particle flow and fluid-solid transportation, and the mechanism of fluid-particle interaction during migration can also be observed.