Fracturing effect of shale gas well is influenced by multiple factors such as reservoir geology,rock mechani-cal properties and ground stress.The results of micro-seismic monitoring and liquid-producing profile test show that the effect of horizontal well reconstruction varies greatly.Therefore,it is necessary to find a fast and accurate method to evaluate the effect of single-stage reconstruction,so as to further implement gas well productivity.Based on the theory of injection pressure drop test,the pressure drop data during the process of fracturing is analyzed,and a mathematical model of unsteady seepage flow in shale gas fracturing wells is established.The double logarithmic curve of pressure and pressure derivative after the pump stop is obtained,and the reconstruction effect of single stage fracturing is quantita-tively evaluated from the curve shape and interpretation parameters.The application results show that the interpretation results of the method are consistent with the micro-seismic monitoring results,which verifies the accuracy of the meth-od.This method can quickly and accurately evaluate the effect of single-stage reconstruction and quantitatively evaluate the single-stage fracture length,providing a basis for accurate numerical simulation and a support for optimal fractur-ing design.
维普
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