Optimization of Fracturing Fluid Flowback Based on Fluid Mechanics for Multilayer Fractured Tight Reservoir

Abstract

The purpose of frac fluid flowback is to outflow the fracturing fluid and prevent the proppant backflow, which determines the effect of fracturing fluid flowback. The fracturing treatment in field lacks relevant theoretical models for prediction. Therefore, this work focuses on establishing the flowback model of hydraulic fracturing for multilayer fractured wells. Then the wellhead pressure and fluid flowback volume are predicted based on the actual parameters of fracturing treatment in the process of flowback and are compared with the field data of frac fluid flowback. Results show that the wellhead pressure and fluid flowback volume calculated by the model are consistent with the field data. The sand production ratio of the three wells during the flowback process is lower than 1% indicating that the optimized parameters achieve the purpose of flowback operations and reduce the flowback volume of the proppant.

Shales Leaching Modelling for Prediction of Flowback Fluid Composition

“…There are many models describing propagation of shale fracture to assess possible production of shale gas [21][22][23][24][25][26]. Some attempts to describe flowback fluid production mechanisms are reported [27][28][29][30] and several methods to develop volume control are described [31,32]. Unfortunately, there are not many investigations dedicated to the prediction of the composition of fracturing flowback fluid and hardly any tools to limit the migration of chosen chemical compounds from the reservoir to the fluid.…”