METHOD OF FABRICATING BACKFILL MATERIAL FOR ISOLATION OF WATER PRODUCING ZONE IN OIL WELL Russian patent published in 2008 - IPC E21B33/138 C08F8/12 

FIELD: oil and gas industry.

SUBSTANCE: suggested method refers to oil and gas producing industry and is designed for repair and isolating works in oil and gas wells, particularly for isolation of water producing zones in an oil well. A sodium silicate block is preliminary dissolved in presence of water at heating and continuous mixing. Then a polyacrylonitrile raw material and caustic soda are simultaneously introduced at a following ratio of components, mas.%: a sodium silicate block 10.0-20.0; water 65.0-85.0; a polyacrylonitrile raw material 3.0-8.0; caustic soda 2.0-5.0.

EFFECT: increased efficiency of water isolating operations due to improved isolating characteristics, to increased mechanical strength of a backfill mass, formed at structuring of obtained backfill material, with simultaneous upgraded heat resistance and reduced cost of the said material.

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