WELL BOTTOM ZONE TREATMENT PROCESS Russian patent published in 2007 - IPC E21B43/27 

FIELD: oil and gas production.

SUBSTANCE: invention is intended to be employed for treatment of bottom zones of oil-producing and injecting wells. Annular space of well above productive formation is separated by means of packer. Emulsion is forced while pressure and production are raised to maximum permissible values. Once maximum pressure value reached, consumption of pumped emulsion is lowered pumping is continued until pumping pressured is decreased. Well is closed and held closed over 20-30 h period, after which pressure is released, packer is removed, and well is swabbed until fluid with pH value the same as that of formation fluid enters the well. Well is then washed and brought in operation. Inverted oil-acid emulsion utilized is composed of distillate-type solvent for petroleum wax, 40-43 vol %, emulsifier "YALAN-E-1", 5-8 vol %, and 22-24% aqueous solution of inhibited hydrochloric acid, 5-55 vol %.

EFFECT: increased formation penetration ability and treatment efficiency.