controlled-release matrix form has successfully prevented paraffin deposition.. Paraffin-related problems occur in almoet all oil producing areas throughout the world. These

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This paper was prepared for presentation at the 1999 SPE Mid-Continent Operations Symposium held in Oklahoma City, Oklahoma, 28-31 March 1999.

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractLow-temperature fracturing applications are considered here to be those in which in-situ reservoir temperature is insufficient to facilitate fracturing fluid degradation (e.g., about 200°F or less.) In these cases, careful consideration must be given to fracturing fluid and gel breaker design to mitigate post-treatment clean-up problems while still providing for significant viscosity development throughout the treatment. Recently, improved manufacturing processes have led to the introduction of processed enhanced guar (PEG), enabling significantly reduced polymer concentrations to be applied with specialized crosslinked guar-borate formulations. These so-called PEG systems have led to enhanced fracture clean-up while achieving excellent proppant placement in the fracture.

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