In order to explore the influence of proppant settlement on the laying form of sand in coal seam cracks

the physical simulation is used to study the rules of proppant settlement and migration based on the previous researches. The visual physical simulation device of proppant transportation can directly and conveniently simulate the proppant placement in the fractures. Fully considering the in-site fracturing construction and the similarity of Reynolds number

the experiment for the influence of single factor change on the sand laying form of proppant is designed. The equilibrium height and time are used as the characterization parameters. In the early stage

the proppant settlement and migration rules of different pump injection displacement

sand ratio and proppant particle sizes are quantitatively analyzed by single crack. In the later stage

a branch crack is added to analyze the rules of proppant settlement and migration in the main crack and branch crack under the condition of different particle sizes of proppant. The results show that the smaller the pump displacement is

the higher the equilibrium height of sand dike will be if the sand ratio and particle size are larger and larger

and the longer the equilibrium time will be if the sand ratio and particle size are smaller and smaller; the distribution rule of branch crack is similar to that of main crack

the equilibrium height is lower than that of main fracture

and the equilibrium time is longer.