Under the influence of fracture shear slippage and wall roughness

the fluid flow channels within the fractures are uneven

making the transport and placement patterns of proppant carried by fracturing fluids more complex. Using core samples from the Longmaxi Formation

rock fracture surfaces were obtained through splitting

and rough fracture plates were created using techniques such as stretching

stacking

and carving to construct an experimental setup for proppant transport in single-sided rough fractures. Semi-quantitative tests of sand dam morphology and quantitative tests of solid-liquid two-phase flow were conducted. Experiments on proppant transport were carried out under conditions of varying roughness

discharge

viscosity

and particle size within the uneven flow channels of rough fractures. Additionally

particle image velocimetry (PIV) / particle tracking velocimetry (PTV) tests were performed in the fracture near-wellbore area under different roughness conditions. Results showed that the flow channels in rough fractures were uneven

and the proppant placement morphology exhibited an irregular concave-like structure

influenced by dominant channels. When fluids and proppants flowed near large protrusions

their original movement direction was altered towards dominant channels. The movement direction of the proppants was also affected by the accumulated sand dam morphology. Discharge was the key factor in reducing the influence of dominant channels

where decreasing discharge could effectively plug these channels. Under varying viscosity and particle size conditions

the influence of dominant channels persisted

with viscosity and particle size mainly affecting the transport distance and accumulation pattern of the proppants. Increased viscosity or reduced particle size led to greater proppant transport distances and layered sand dam accumulation.