METHOD FOR TREATMENT OF WELL PERFORATED ZONE Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: method for treatment of well perforated zone includes determination of type of argillaceous deposits in reservoir, stage injection into well of process solution, its holding and well completion. Process solution at the first stage is used in form of methanol in volume of 1.5-1.0 of pore volume of treated zone; at the second stage, process solution is used in form of aqueous of surfactant in volume 0.2-0.4 of pore space, and at the third stage. with presence in the reservoir of montmorillonite argillaceous deposits, process solution is used in form of sulfur oxygen-containing compounds or their mixture (5-12 mas.); surfactant (0.5-2 mas. ) and water; or in case of presence in reservoir of kaolinite argillaceous deposits, process solution is used in form of sodium and/or potassium, and/or ammonium bicarbonate, surfactant and water. EFFECT: increased permeability of formation zone due to removal of semisolid high-molecular deposits and argillaceous components. 3 cl