Abstract:

Combining reservoir engineering method and numerical simulation technology, accounting for the non-Newtonian behavior of fracturing fluid and the 2 dimensional flow of filtrate during fracturing operation, a 2D dynamic leak off model of non-Newtonian fracturing fluid was established. Numerical method was employed to solve this model and the simulation results were compared to that of 1D model. It shows that, the leak off rate calculated at the consideration of that fracturing fluid leak off flows in the direction that perpendicular to the fracture face is smaller than that of 2D flow, and their difference increases with formation permeability. The 2D model is more reasonable. Because the non-Newtonian behavior of fracturing fluid and the 2D flow were accounted, this model is more applicable and its simulation results are closer to field. It can reduce the fracturing operation venture and increase the reliability of fracturing design.

Key words: filtrate loss, fracturing fluid, 2D model, numerical simulation