Method of breaking metal-crosslinked polymers

Details Method of breaking metal-crosslinked polymers Method of breaking metal-crosslinked polymers

1992-07-20

1993-07-06

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

1663051, 166308, 252 8551, E21B 4326

Patent

active

052245462

ABSTRACT:
A new method is provided for improved degradation of metal-crosslinked polymer gels which are useful in oil and gas well treating operations. In this method an esterified carboxylated chelator is added to the gel. At elevated temperatures, the esterified chelator undergoes hydrolysis to form an acid and an active ligand which subsequently removes the crosslinking metal ion from the gel and hydrolyses the polymer.

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