Considering the heat exchange between the fracture fluid and the rocks occurred in closure process and by means of building up hydraulic fracture temperature field model,the change of temperature field during the fracture closure process has been figured out and combined with the experiment data of that the temperature affects the fluid flowage .

Firstly, according to theory of fluid flow in porous media, mechanism of leakoff of fracturing fluid during fracture closure was analyzed and a 2D dynamic leakoff model of non-Newtonian fracturing fluid was estab.