Fracturing operations in Texas and other locations have been improved by (1) mixing fracturing slurries under microprocessor control, (2) applying new baffle and agitator design concepts, and (3) using new methods for achieving rapid material wetting. With these new methods, high sand concentration slurries can be mixed in high-viscosity gels, at low or high rates. A ramped pumping schedule can be used to help achieve greater fracture length since pumping stoppage caused by "sandout" can be delayed or prevented.

This paper presents the design and description of the mixing system that makes possible the above-mentioned improvements. and presents case histories of field applications. Proppant schedules and job data are also presented.

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