METHOD OF STABILIZATION OF BOTTOM-HOLE PRODUCING FORMATION ZONES Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry. SUBSTANCE: method includes perforation of casing string in washed out interval of bottom-hole zone, formation of sand permeable barrier by injection into annular space, through perforations, of quartz sand in liquid carrier with aqueous solution of sodium silicate with subsequent injection of alcohol solution of calcium chloride in volume of pore space of formed barrier. In this case, additionally, before formation of barrier, aqueous solution of sodium silicate is injected with density of 1250-1300 kg/cu.m in amount ensuring full filling of pre space of annular space of producing formation at distance of 0.45-0.60 m from well. Before injection of alcohol solution of calcium chloride, emulsion solution of the following composition is injected, wt. %: flotoreagent oxal T-80 40-60; neonol AF9- 2 0.10-0.15; hydrocarbon fluid 39.85-59.90, in volume of pore space of formed sand permeable barrier. Aqueous solution of sodium silicated is used in form of water glass with density of 1400 kg/cu. m, which is used for treatment of quartz sand at wellhead before injection into well in weight ratio of (0.20- 0.30):1.00, respectively. EFFECT: higher efficiency of stabilization due to formation of strong sand permeable barrier with simultaneous preservation of intake and filtration characteristics of bottom-hole formation zone. 3 ex