METHOD FOR TREATMENT OF BOTTOM-HOLE FORMATION ZONE Russian patent published in 1996 - IPC

FIELD: oil producing industry, particular, thermochemical treatment of bottom-hole formation zone. SUBSTANCE: method for treatment of bottom-hole formation zone includes successive injection of oxygen-containing organic substance, aqueous solution of nitrate or mixture of nitrates of metals from the group including beryllium, bismuth, cadmium, cobalt, manganese, copper, nickel, lead, strontium, aluminium, iron, chromium, tin with the content of nitrates in aqueous solution from 2.0 mas.% to that corresponding to saturated solution, and aqueous 18-38% solution of hydrochloric acid. Aqueous solution of nitrates may contain nonionic surfactants or mixture of nonionic surfactants with their total content in mixture with aqueous solution of nitrates of 0.001-5.0 vol.%. Aqueous solution of hydrochloric acid may contain anionic, cationic, nonionic surfactants or their mixtures with total content of them in the mixture with aqueous solution of hydrochloric acid of 0.001-5.0 vol.%. EFFECT: higher well production rate due to increased depth of treatment and demudding capacity of working fluids, and reduced explosion hazard during work. 3 cl, 4 tbl