Abstract： The fracturing fluid flowback has great influence on fracturing. The modeling of fracturing fluid flowback in our country is mainly aimed at the conventional sandstone reservoirs， because the plexity of the model has to besimplified， the calculation results is prone to error and deviation. This paper optimized the fracturing fluid flowback modelaccording to the law of conservation of mass flow and the fracture morphology changes， and then used the volume balance principle to solve the model. Giving the quantitative judgment through the pressure change on the crack closing time can provide a theoretical basis for the subsequent discharge nozzle size selection.
这一次的离开，将会永久