BLOCKING COMPOSITION FOR WELL KILLING, METHOD OF ITS PREPARATION AND METHOD OF WELL KILLING USING BLOCKING COMPOSITION Russian patent published in 2024 - IPC C09K8/588 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the well killing technology in the fields, including those complicated by abnormally low formation pressures, as well as other development objects, and can be used in well repair. Composition for well killing, represented by self-destructing polymer of three-dimensional structure, obtained by mixing in water a monomer, a cross-linking agent and an initiator, and subsequent drying, characterized by a water swelling coefficient (α) of not less than 4 on the first day at temperature of 40°C or more. Invention also relates to a method for preparing a well killing composition and to the use of a well killing composition, at which inert carrier with well killing composition is pumped into well.

EFFECT: simplification of the well repair process and increase in the well killing efficiency at various deposits in a wide range of formation temperatures from 40 to 105°C and various time intervals, depending on the type of well repair, while ensuring high productivity of the process of removing the blocking composition after well repair and reduction of time for bringing the well to the mode.

28 cl, 2 tbl, 6 ex