Method for acidizing high temperature subterranean formations
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United States of America Patent
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May 19, 1981
Issued Date -
N/A
app pub date -
Mar 24, 1980
filing date -
Feb 22, 1979
priority date (Note) -
Expired
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Abstract
Subterranean formations having temperatures above about 250.degree. F. are acidized by introducing a substantially anhydrous foamed treating fluid through a well and into the formation. The treating fluid contains a gas, a nonionic substantially hydrophobic foaming agent and an acid precursor which is normally liquid halogenated hydrocarbon having one or two carbon atoms per molecule. The acid precursor hydrolyzes in situ to generate a hydrohalic acid.
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