Method for selectively acidizing the less permeable zones of a high temperature subterranean formation
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United States of America Patent
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Apr 14, 1981
Issued Date -
N/A
app pub date -
Mar 24, 1980
filing date -
Mar 24, 1980
priority date (Note) -
Expired
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Abstract
The less permeable zones of subterranean formations having temperatures above about 250.degree. F. are acidized by selectively plugging the more permeable zones with acid-soluble particulate diverting agents and then injecting a substantially anhydrous acid precursor into the formation. The acid precursor, which is a normally liquid halogenated hydrocarbon having one or two carbon atoms per molecule, hydrolyzes in situ to generate a hydrohalic acid. Subsequent to the placement of the acid precursor in the less permeable zones, the diverting agents may be solubilized in acid, such as the partially spent acid returning to the well.
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