Compositions and methods for treating a subterranean formation
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United States of America Patent
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Apr 18, 2006
Grant Date -
Sep 22, 2005
app pub date -
Apr 27, 2005
filing date -
Dec 21, 2001
priority date (Note) -
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Abstract
A method is provided for diverting the majority of the fluid injected into a stratified subterranean formation, that has at least one problematic zone and at least one hydrocarbon zone, into the hydrocarbon zone. In the method, a viscous diverting fluid made with a gelling amount of a surfactant and an acid is injected before the main treatment; after the treatment the acid decomposes the surfactant. The main treatment may be hydraulic fracturing, acid fracturing and matrix acidizing. The fluid used as the diverting fluid may also be used as the carrier fluid in hydraulic fracturing or gravel packing. Destruction of the surfactant alleviates the potential of diverters or carrier fluids to damage formations.
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