Curve Shape Analysis of Sand Hydraulic Fracturing Operation

F racturing operation is an important measure of stim-ulation.Based on fracturi ng data from over200wells,vari-ations of curve shapes of pump pressure,di scharge capacity and sand-fluid ratio with time are analyzed and5curve types are summarized including decline type,stabilized de-cline type,wave type,asc ending type and stabilized type.Curve shapes of decline type and stabilized dec line type are the results of enlargement of fracture height;that of wave type is controlled by heterogeneity of physical proper-ty;that of ascending type is influenced by the low perme-ability and small layer thickness;and that of sta bilized type is possibly caused by increasing of filtration loss.Parame-ters o f sand fracturing operation can be adjusted according to the curve shapes to ens ure smooth operation.