Wells – Processes – Specific low fluid loss feature for fluid attacking formation
Reexamination Certificate
2006-02-07
2006-02-07
Suchfield, George (Department: 3676)
Wells
Processes
Specific low fluid loss feature for fluid attacking formation
C166S294000, C166S300000, C507S260000, C507S265000, C507S933000
Reexamination Certificate
active
06994166
ABSTRACT:
It has been discovered that solid, particulate dicarboxylic acids are useful as diverting agents in methods for acidizing subterranean formations to improve the uniformity of the acid treatments (acid displacement) by diverting acid to intervals of relatively less permeability. Particularly suitable solid, particulate dicarboxylic acids include, but are not necessarily limited to, those insoluble in both aqueous and hydrocarbon liquids, but which are soluble in mutual solvents or alcohol blends. These acids may have melting points of from about 180 to about 300° F. (about 82 to about 149° C.), formula molecular weights of from 146 to 400, and mesh sizes of from about 20 mesh to about 400 mesh (about 841 to about 38 microns). Particular dicarboxylic acids that fit this description include, but are not necessarily limited to, dodecanedioic acid, undecanedioic acid, decanedioic acid, azelaic acid, suberic acid, and mixtures thereof.
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Huang Tianping
McElfresh Paul M.
Madan Mossman & Sriram P.C.
Suchfield George
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