BACKFILL COMPOUND FOR LOW TEMPERATURE WELLS Russian patent published in 2011 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: backfill compound includes Portland cement and mixing liquid including water and hydrosil. In addition, it contains salt of trivalent cation and sugar lime in the form of swells - sugar production wastes, and aluminium salts have been taken as salts of trivalent cation at the following ingredient ratio, wt %: Portland cement 59.9-64.2; Aluminium salt 1.8-3.7; Hydrosil 3.3-5.5; Sugar lime1.02-4.25, and water is the rest.

EFFECT: increasing strength and adhesion of cement stone to walls of column and well.

1 tbl, 7 ex