Methods and compositions for reducing subterranean formation...

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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C507S221000, C507S211000, C507S239000, C507S269000, C507S271000, C507S272000, C507S903000, C166S285000, C166S295000, C166S300000

Reexamination Certificate

active

07091160

ABSTRACT:
Methods and compositions for reducing the permeabilities of subterranean formations or zones are provided. The methods of the invention are basically comprised of introducing an aqueous composition into the formation or zone comprised of water, a water soluble organic polymer, an organic gelling agent for cross-linking the organic polymer and a gel retarder comprised of a chemical compound that hydrolyzes or thermolyzes to produce one or more acids in the composition and then allowing the aqueous composition to form a cross-linked gel in the formation or zone.

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