Controlling fracture growth

Wells – Processes – Separate steps of fracturing or attacking formation

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166280, 166308, E21B 43267

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active

048876704

ABSTRACT:
The present invention provides methods of controlling the growth of one or more vertically oriented fractures in a subterranean formation during a fracturing treatment. A first fluid having a known density and containing a diverting agent is introduced into a formation to create a fracture. A second fluid which may contain proppant and having a known density different from the first fluid then is introduced into the fracture whereby the second fluid selectively overrides or underrides the first fluid. Such fluid control forces the first fluid to the bottom or top of the fracture whereby the diverting agent therein is caused to screen out and impede further downward or upward growth of the fracture. The introduction of the second fluid then can be continued to extend the fracture as desired.

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SPE 13797, "The Use of Density Control Foam Fracturing for Selective Proppant Placement in the Bartlesville Formation," Barber et al., 1985.
SPE 16433, "Mechanisms Controlling Fracture Height Growth in Layered Media," BenNaceur et al., 1987.
SPE 12152, "Fluid-Loss Control in the Naturally Fractured Buda Formation," Hall et al., 1983.

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