METHOD OF THERMOBAROCHEMICAL TREATMENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2003 - IPC

FIELD: oil and gas production; applicable in completion of oil wells and in restoration of production rate of producing wells and in restoration of production rate of producing wells and injectivity of injection wells. SUBSTANCE: method includes injection through ejector to pipe or annular space of steam to depth provided by capabilities of used steam generator. Ejected together with steam into well is highly volatile hydrocarbon solvent. Steam-gas phase is compressed and forced to bottomhole by displacing fluid with pump pressure exceeding pressure built-up by steam generator. Highly volatile hydrocarbon solvent is used in form of gas condensate, liquid-phase volatile hydrocarbons with boiling point of 35-50C. Displacing fluid is used in form of acid surfactant composition containing, wt.%: hydrochloric acid 5-23; hydrofluoric acid 2-10; nonionic surfactant 1-5; solvent ASPO, for instance, toluene-xylene fraction 5-25; the balance, water. EFFECT: higher efficiency of cleaning of bottomhole zone from cuttings. 1 dwg