GROUTING MORTAR Russian patent published in 1999 - IPC

FIELD: oil and gas production. SUBSTANCE: grouting mortar contains preliminarily calcined in spray drier at 550-650 C distiller liquid obtained as waste in distillation stage of sodium hydroxide production. This mortar constituent is composed of, wt %: CaCl₂ 69.40-65.80, CaSO₄ 0.05-0.10, Ca(OH)₂ 0.05-0.10, NaCl 32.15-38.50. Mortar is composed of, wt %: cement 43.5-62/5, distiller liquid 0.7-6.2, nonsorted microspheres 6.5-19.9, and water - the balance, cement-to-microspheres ratio ranging from 75:25 to 90:10. Microspheres are composed of, wt %: SiO₂ 50-60, Al₂O₃ 25-35, Fe₂O₃ 1.8-2.0, CaO 1.0-1.5, MgO 0.5-1.5, Na₂O 0.3- 1.5, K₂O 0.2-2.9, and minor components 0.3-1.4. EFFECT: reduced density of mortar, increased strength of cement stone, and reduced water loss. 2 tbl