METHOD FOR STIMULATING BOTTOMHOLE ZONE OF PRODUCTIVE FORMATION Russian patent published in 2005 - IPC

FIELD: oil production equipment, particularly to remove polymeric formations from rock in bottomhole zone.

SUBSTANCE: method involves supplying processing medium into formation; holding processing medium in the formation to provide reaction between polymeric clogging formation and processing medium and removing degradation product from the formation. Processing medium includeshydrogen peroxide in amount of 1.2-1.5% by weight, clay hydration inhibitor in amount of 5-10 % by weight, remainder is water. The processing medium is injected into predetermined formation interval to be stimulated and held in the formation for 3-5 hours, which is necessary for pore space draining and for destructive hydrogen peroxide action on polymeric clogging formations. After that degradation products are removed from production well formation up to formation fluid appearance. The clay hydration inhibitor is potassium chloride of magnesium chloride or calcium chloride.

EFFECT: increased rock permeability, possibility to achieve well yield close to potential value during secondary formation penetration, well completion and pullout.

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