POLYMER COMPOSITION FOR ISOLATION OF WATER INFLOW IN OIL AND GAS WELLS Russian patent published in 2014 - IPC C09K8/504 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed composition comprises the solution of summed shale alkyl resorcinols in one- or diatomic alcohols and hardener containing formalin, paraformaldehyde, polyatomic alcohols and catalyst of condensation reaction of alkyl resorcinols with formaldehyde. Note here that hardener comprises water-soluble products of starch hydrolysis products as polyatomic alcohols. Said catalyst of condensation reaction of alkyl resorcinols with formaldehyde represents organic acid with negative logarithm of dissociation constant pK_a-1-4 in amount of 1 to 10 wt % of total shale alkyl resorcinols at the following ratio of components, wt %: paraformaldehyde - 0.1-10, starch product - 20-30, said organic acid - 0.5-7, formalin making the rest at volume ratio between hardener to aforesaid solution of summed shale alkyl resorcinols in one- or diatomic alcohols.

EFFECT: higher efficiency and quality of repair and isolation works, use of hardener at lower temperatures.

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