Transport Pattern and Placement Characteristics of Proppant in Different Rough Fractures

The transport and placement characteristics of proppant in rough fracture is great significance for optimizing fracturing parameters making to the deep part effective support. This paper scans surface morphology rock samples after fracturing, generates based on scanned data, uses high-order interpolation function generate with different roughness, establishes a numerical model roughness Euler-Euler two-phase flow model. effects fluid velocity, size, density carrying viscosity pattern were compared analyzed. results show that: (1) complex spatial structure hinders makes uneven, tortuous variable; Compared smooth fracture, equilibrium height higher, more settlement at front end easy cause sand plugging; (2) Higher smaller size are conducive which not plugging, can make be carried support (3) Increasing reducing significantly improve performance fluid, better pass through branch fracture. changing other process parameters, has significant effect. But field process, increasing easier achieve, so hydraulic design, should considered first, 70% dimensionless used as critical point evaluate efficiency. Exceeding plugging. Optimize parameters. It recommended that velocity greater than 0.2 m/s, less 0.32 mm, 2600 kg/m3, 2 mPa s construction. (4) Proppant placed main first multi-cluster then into reaching certain height. shows symmetrical distribution suggested selected construction enter research provide theoretical basis realizing efficient filling