On-the-fly control of delayed borate-crosslinking of fracturing

Earth boring – well treating – and oil field chemistry – Well treating – Contains inorganic component other than water or clay

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Details

507209, 507211, 507217, 507266, 507922, 166308, C09K 300, E21B 4317

Patent

active

058771271

ABSTRACT:
A method is provided for controlling the delay time of aqueous borate-crosslinked polysaccharide-based fluids for hydraulic fracturing and related applications which allows on-the-fly control of the delay time without comprising overall fluid integrity. Without having to modify the total boron content nor pH of the fracturing fluid, the delay time is controlled by adding a polyol to the fracturing fluid at a first rate, determining the resulting delay time and then adjusting the rate of the polyol addition to the fracturing fluid until the desired delay time is achieved.

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