METHOD FOR BOTTOMHOLE SUPPORT IN WELL Russian patent published in 2019 - IPC E21B33/138 C09K8/56 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular to methods for strengthening well bottom zone and preventing removal of rocks. Method for strengthening the well bottom zone includes sequential injection of a fixative composition and a hardener. Binding composition contains ethyl silicate-40 and isopropyl alcohol in a ratio of 9:1. 5 and 10 % sodium hydroxide solutions are used as a hardener. Before injection of the fixative composition, a 5 % solution of sodium hydroxide is pumped into the well, then buffer from fresh water, and after injection of the fixative composition, buffer is pumped from fresh water, then a 10 % sodium hydroxide solution and resell into the formation with a process fluid with a density corresponding to the density of the well plugging fluid.

EFFECT: increase of efficiency due to reliable and safe mounting of the well bottom zone by eliminating sand manifestation, eliminating corrosion, reducing the duration of the method and the possibility of its use in the winter season.

1 cl, 1 tbl, 3 ex