Synthetic Polymer Fracturing Flowback Fluid Reusing Indoor Research

Fracturing technology is an important means of increasing production in low-permeability reservoirs.The conventional modified glue fracturing fluid has the problems that it have large fluctuations in raw material prices,large amounts of flowback fluids residues,serious damage to the reservoir,various types of chemical additives,leading to complex reusing processes and high costs,and direct emissions cannot meet the requirements of environmental regulations.In view of the above issues,first of all,because the synthetic polymer fracturing fluid system has the characteristics of low residue and low core damage,this paper base on the optimization of the formulation system of the fracturing fluid,using the Hake rheometer,surface tension meter and simulated core damage device and other equipment,studies the basic properties of synthetic polymer fracturing fluids,such as temperature and shear resistance,the surface tension of the flowback fluids and the matrix damage rate of the rock;secondly,the paper take the excellent temperature and shear resistance performance of reusing fracturing fluid as an indicator to optimize the proportion of chemical additives such as thickening agent,gel breaker,and cross-linking agent;finally,the factors influencing the main performance of the reutilization fracturing fluid system are explored,and primary fracturing is discussed,differences and connections between fluid systems and reusing of fracturing fluid systems are also explored.It is concluded that the viscosity is stabilized at about 200 m Pa·s after the fracturing fluid system is sheared at 100°C and 170S-1 for 120 minutes,so that the synthetic polymer fracturing fluid flowback fluids system is reused under laboratory conditions.