Borate-crosslinked fracturing fluids have been among the fluid choices in the early growth of the frac-and-pack treatments in the Gulf of Mexico.1  Highly conductive fractures connecting the wellbore and formation were recognized as key to the success of frac-and-pack treatments.2  To enhance fracture conductivity, one suggestion was minimizing polymer loading and maximizing breaker loadings to a point that does not adversely affect fluid stability during the frac-and pack-treatment.3 

All three of these elements have been combined in a new fracturing fluid system for fracturing and packing treatments. This new fluid system provides higher viscosity with lower gelling-agent concentrations than conventional, borate-crosslinked fluids. A new, non-persulfate breaker system has been developed for use with this fluid system specifically for use from 170° to 200°F.

The new, optimized borate-crosslinked fluid system (OLGB), with application to 200°F, was applied to frac-and-pack treatments in the Gulf of Mexico. This paper

  • provides laboratory data and examples

  • discusses the field application of the new fracturing fluid system

  • compares the new OLGB fluid system to existing conventional borate fluids

  • discusses the newly-developed breaker system

  • presents viscosity, fluid-loss, and conductivity data for the new system.

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