Development and Performance of Solid Boron Crosslinking Agent

This paper discusses the development and performance of a solid inorganic boron crosslinking agent, G-CYS, for use in fracturing, and four fracturing fluids for use at 100℃, 120℃, 140℃, and 160℃, respectively. The four fracturing fluids at different temperatures have good high temperature stability and shear thinning performance, and their gels are thoroughly broken to low viscosity fluids. At 160℃, the fracturing fluid has a viscosity of 120 mPa·s after shearing 2 min at 1000 s^-1, or 120 min at 170 s^-1, satisfying the needs for medium or high temperature fracturing. The dissolution rate of the solid boron crosslinking agent can be controlled with pH and temperature, thereby adjusting the time for cross linking. The fracturing fluid, after completion of crosslinking, will not dewater for more than 60 min, which is satisfactory for field use, where job delay inevitably leads to dewatering and quality-deterioration of fracturing fluids.