METHOD FOR CREATING SEPARATING LAYER ON SURFACE OF SATURATED SOLUTION OF SODIUM CHLORIDE IN UNDERGROUND TANK Russian patent published in 2011 - IPC E21B33/14 

FIELD: mining.

SUBSTANCE: tank is filled with solution to the level below casing shoe of production well; floating layer of viscous and plastic composition is applied to the solution surface. The above composition represents liquid composition hardened under action of solution and pre-obtained by mixing of film-forming polymer dispersion and low-density dispersion filler. Then, layer of solution of mineral binder pre-obtained by mixing mineral binder, film-forming polymer dispersion, low-density dispersion filler and water is applied to it. Liquid composition is preferably used with the following component ratio, wt %: polyurethane or acryl polyurethane dispersion - 60-75, aluminosilicate hollow microspheres - 25-40, as well as cement mortar with the following component composition, wt %: special fine mineral binder - 35-45, aluminosilicate or glass hollow microspheres - 10-15, film-forming polymer dispersion - 12-20, and water - the rest, up to 100.

EFFECT: simplifying the method for creating a separating layer due to the number, duration and labour intensity of preparatory operations for the process of its immediate formation on the solution surface; improving its quality characteristics.

3 cl, 2 tbl