Methods and compositions for treating subterranean zones using environmentally safe polymer breakers
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United States of America Patent
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Jul 19, 2005
Grant Date -
Nov 4, 2004
app pub date -
Apr 18, 2003
filing date -
Apr 18, 2003
priority date (Note) -
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Abstract
Methods and compositions for treating subterranean zones penetrated by well bores utilizing environmentally safe viscous fluids including a solubility increasing boron complex or ester forming compound. A method of the invention comprises the following steps. A viscous treating fluid composition is provided comprising water, a viscosity increasing polymer and a water soluble delayed polymer breaker that comprises a mixture of sodium perborate tetrahydrate and a solubility increasing boron complex or ester forming compound. The viscous treating fluid composition is introduced into the subterranean zone wherein the viscous treating fluid is allowed to break into a thin fluid of reduced viscosity.
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