Optimization and application of high temperature organic boron crosslinker in Liuyangpu gas field

Liuyangpu gas field is characterized by high formation temperature, deep gas reservoir, low porosity, special permeability and fine pore throat, which is resistant to temperature and shear of fracturing fluid. For this purpose, a high temperature organic boron crosslinking agent was optimized. The base fluid pH value, crosslinking temperature and the crosslink ratio which influence the crosslinking time have been analyzed, which provides data support for the application of crosslinking agent. The fracturing fluid prepared by using optimized high temperature organic boron crosslinker has the following advantages, such as good temperatureresistive and shear-resistive properties(viscosity can still be reached 160 mPa·s after shearing 120 minutes at 130℃,170 s~(-1)), adjustable delayed crosslinking time(crosslinking time between 150 and 180 seconds), gel breaking thoroughly, less residue, and small damage to the reservoir. It can meet the needs of fracturing operation during deep and high temperature reservoir. The crosslinking agent has been tested three well eleven segments in Liuyangpu gas field, and the success rate has been reached 100%, which has obtained good fracturing effect.