LOW-DENSITY GROUTING MORTAR Russian patent published in 2014 - IPC E21B33/138 C09K8/467 

FIELD: oil-and-gas industry.

SUBSTANCE: low-density grouting mortar contains astringent, light filler, super plasticiser C-3, nitrile trimethyl phosphonic acid - NTF and water. Said binder represents high-water-absorption finely ground binder with specific surface of 20000-25000 cm²/g - "Microdur" or INTRATSEM while light filler is composed of hollow glass microspheres. Said components are present at the following ratio, wt %: high-water-absorption finely ground binder - 100, hollow glass microspheres - 10-100, NTF - 0.07-0.25, super plasticiser C-3 - 0.2-1.3, water - 150-320.

EFFECT: expanded applications, higher penetration ability, higher adhesion of stone with rock.

2 tbl, 1 ex