Methods for controlling the fluid loss properties of viscoelastic surfactant based fluids
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United States of America Patent
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Jul 25, 2006
Grant Date -
May 19, 2005
app pub date -
Nov 13, 2003
filing date -
Nov 13, 2003
priority date (Note) -
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Abstract
Disclosed are methods of treating subterranean formations by first providing a suspension of colloidal particles prior to the injection of viscoelastic based treatment fluid, and injecting the treatment fluid into a well. The colloidal particles reduce fluid loss into the formation. According to a second embodiment, the treating fluid includes a hydrophobically-modified polymer, said hydrophobically-modified polymer being present at a concentration between approximately its overlap concentration c* and approximately its entanglement concentration c.sub.e. The method is particularly useful for fracturing operations in medium to high permeability formations.
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