Method for delaying the setting of an acid-settable liquid in a

Compositions: coating or plastic – Coating or plastic compositions – O-containing organic compound

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166295, 260 296H, C08K 336

Patent

active

040159957

ABSTRACT:
In an improved method for the treatment of a permeable formation or zone adjacent to the bore of an oil well, the setting time of an acid-settable liquid is predictably delayed by use of a novel catalyst system. The method provides an effective means for controlling the reduction of the permeability of the formation or zone in a single stage treatment by dissolving the catalyst in the liquid and introducing the solution into the formation. The catalyst system comprises a mixture of a suitable acid-releasing compound and a base.

REFERENCES:
patent: 3093493 (1963-06-01), Freyhold
patent: 3943084 (1976-03-01), Hess
Chem. Abst. 70:14694m, 1969.

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