Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate
2007-01-23
2007-01-23
Buttner, David J. (Department: 1712)
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
C507S203000, C507S923000, C507S933000, C166S308100, C166S308300
Reexamination Certificate
active
10605784
ABSTRACT:
An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.
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U.S. Appl. No. 60/325,071, filed Sep. 26, 2001.
SPE 7892—Higher pH Acid Stimulation Systemsby Charles C. Templeton, E.A. Richardson, and Ronald F. Scheuerman.
Dismuke Keith
Frenier Wayne W.
Still John W.
Buttner David J.
Curington Tim
Mitchell Thomas O.
Nava Robin
Schlumberger Technology Corporation
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