Fracture volume inversion method and system based on fracturing early stage flowback data

Abstract

The invention discloses a fracture volume inversion method and system based on fracturing early stage flowback data. The method comprises the following steps: obtaining single well reservoir physical property parameters, fracturing construction parameters and production data; according to the wellhead pressure and the corresponding fracturing construction parameters and production data, the flowing bottomhole pressure and the cumulative liquid production amount are calculated; on the basis of the flowing bottomhole pressure, the cumulative liquid production capacity and the corresponding single-well reservoir physical property parameters, the reciprocal number of liquid production indexes and the material balance time are calculated; calculating an early flowback curve slope and a crack compression coefficient based on a relation curve of a liquid production index reciprocal and material balance time; and the flow-back curve slope, the fracture compression coefficient and the corresponding formation water volume coefficient are substituted into a preset formula, and the total fracture volume after fracturing transformation is obtained. According to the method, the fracturing degree can be accurately obtained, data are accurate, and human interference factors are small.

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