Abstract: Methods and apparatus for fracturing a subterranean formation which use a fracturing tool. The fracturing tool includes a hydrajet tool, with at least one fluid jet and at least one fracturing port extending through the liner. The fracturing tool further includes a rotating sleeve with at least one interior fracturing port and at least one interior fluid jet port. Finally, the fracturing tool may include a power unit capable of changing the orientation of the rotating sleeve. During fracturing operations, fracturing fluid is pressured through the fluid jet to form microfractures. The orientation of the rotating sleeve may then be changed and fluid may be forced through the fracturing ports to form fractures by the stagnation pressure of the fracturing fluid.

Abstract: The present invention is directed to a low cost method and apparatus for fracturing a subterranean formation. The invention involves using a centrifugal pump to combine a fracture fluid, a sand suspension and liquid additive and discharge a mixture of these components into a high pressure pump that injects the mixture into the subterranean formation. The apparatus employs a control pinch valve to precisely control the amount of sand suspension being added to the mixture. The apparatus eliminates the need for expensive blenders, other equipment and associated personnel and provides a low cost means of fracturing the subterranean formation.