Abstract:

The hydraulic fracturing has become an important approach in stimulation of well. The pressure evaluation to every process in fracturing implement is required in split knowledge and fracturing appraisal. There is no matured method at all aims to downhole pressure in fracture fluid flowback process. This paper illustrates the flowback physical process on the basis of fracture fluid filtrating in reservoir. The conception of high pressure zone around fracturing is also introduced. And at same time, the fracture split is looked as an assemble of transient point source. A mathematical model describing fluid flowback process is created represented along with a set of equations using Green's function. Differential computing to the theoretical model is running and the fitting analysis comparing the model with the realistic testing data give out the quantizing results. This paper provides a new analysis method to study the downhole pressure in fracture fluid flowback process, and supplies a theoretical foundation to the fracturing implement and the fracturing performance appraisal.

Key words: fracturing, flowback process, point function, pressure analysis