METHOD TO INSULATE ABSORPTION ZONE IN WELL Russian patent published in 2012 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: method to insulate an absorption zone in a well includes portion preparation of plugging compositions based on acetone-formaldehyde resin and liquid glass that harden in presence of structure formers, their pumping into a well and placement in an absorption zone. During preparation of two separate portions of plugging compositions, a gel powder and a structure former for liquid glass are added into a portion from acetone-formaldehyde resin, a structure former for acetone-formaldehyde resin is added into a portion of liquid glass, and structure formers are represented by accordingly a phosphogypsum and a 15% aqueous solution of caustic soda, besides, pumping and movement of plugging composition portions in the well is carried out by two contactless flows, and mixing of flows is carried out upstream the absorption zone at the ratio of 1:1 with the following ratio of components, wt parts: the first flow: acetone-formaldehyde resin 120, gel powder 25, phosphogypsum 40, the second flow: liquid glass 105, 15% aqueous solution of caustic soda 30.

EFFECT: increased efficiency of repair insulation works under conditions of high absorption due to prevention of hydraulic insulation screen washout in process of its formation.

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