TREATMENT METHOD FOR WELL BOTTOMHOLE PRODUCTIVE FORMATION ZONE CHARACTERIZED BY DIFFICULT-TO-RECOVER OIL

摘要

FIELD: oil production industry, particularly to treat bottomhole formation zone and injection wells, which are converted from producing wells. ^ SUBSTANCE: method involves injecting solvent composition mixed with surfactant in formation; forcing composition in formation; performing time delay and putting well in operation. Before the composition forcing in formation the composition is held at face within the limits of well filter location for 1-2 hours in dependence of filter contamination with asphalt-tar-paraffin deposits or activating technical means usage. The solvent is distillation residue obtained during ethylbenzene and A or B grade styrene rectification. The surfactant is grade B liquid sulphanole taken in amount of 1-10% by the distillation residue weight. ^ EFFECT: increased efficiency, reduced time and material consumption for bottomhole formation zone treatment.