COMPOSITION FOR FORMATION WATER SHUTOFF IN HIGH-TEMPERATURE OIL AND GAS WELLS Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, repairs and shutoff operations in high-temperature oil and gas wells tapping the reservoirs of various permeability, including low-permeability ones. SUBSTANCE: composition includes water glass Na₂SiO₃ and dispersion medium in the form of 3-% alcohol solution of hexahydrate calcium chlorine CaCl₂6H₂O, with the following ratio of components: 3-% alcohol solution of hexahydrate calcium chloride CaCl₂6H₂O, 0.66; water glass, Na₂SiO₃, 0.34. EFFECT: developed noncorroding composition ensuring maximum formation water shutoff in high-temperature wells with minimum adverse effect on formation reservoir properties. 2 tbl