In high pH, low temperature fracturing fluids, enzymes are not useful breakers because enzymes are not active in high pH solutions. When these types of fluids are used, oxidizing breakers are used in conjunction with activators to break water-based fracturing fluids. A delayed release oxidizing breaker which it's operable temperature range is between 70 – 125 °F has been developed. This breaker is useful in delaying the break of high pH, low temperature fracturing fluids. Improved fluid rheology in the applicable temperature range was also attainable with this product. Filter cake dissolution studies pointed to the usefulness of the delayed release product in cleaning filter cakes of borate fluids. This product will allow the breaker concentration to be increased over the amount of conventional breaker currently added. This will lead to improved fracture cleanup. Actual field trials made in a Belridge Field study suggested that improved performance of borate fluids in the low temperature zones was attainable. Using a borate fluid with the delayed release breaker added allowed more sand to be placed in the fracture and increased cumulative oil production.

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