METHOD OF FORMATION ABSORPTION ZONE ISOLATION Russian patent published in 2010 - IPC E21B33/13 C09K8/502 C09K8/508 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil-and-gas industry, particularly to methods of isolating zones of trouble and can be used in well drilling and repair. In compliance with proposed method of isolating formation absorption zone, sequentially pumped therein are suspension of water-based chemical gypsum with gypsum concentration in suspension making 1 to 50% to reduce relative injection capacity within 0.05 m³/h MPa -2.0 m³/h MPa and, then suspension of chemical gypsum mixed with formaldehyde resin and acidic solidifier with gypsum concentration of 0.01 - 65%. Note here that, prior to and after pumping suspension into formation, fluid sodium glass is forced therein with the following ratio: water-based chemical gypsum suspension - liquid sodim glass 1:0.1-2, while as chemical gypsum used are wastes of production of phosphoric acid - phosphogypsum, hydrofluoric acid - fluorogypsum, boric acid - borogypsum, magnesium - magnesium gypsum, cellulose - hydrolytic gypsum.

EFFECT: higher efficiency of formation absorption isolation, reduced time of work.

3 cl, 3 tbl