METHOD FOR CLEANING WELLS FROM ASPHALT-RESIN-PARAFFIN DEPOSITIONS Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: method is finally aimed at intensification of oil recovery by removing asphalt-resin-paraffin depositions occurred in system of extraction, transportation and storing of oil. According to method, injected into bottom-hole zone of well is surface-active agent which contains 5-20% of sulphonic acid of general formula R-SO_nH, where n = 3-4, and R = C_mH_(2m+1) or C_mH_(2m+1), m = 12-14 in aromatic solvent of general formula (R′), (R″), (R″′)-C₆H_n, where n = 3-5, and R', R'', R''' are equal or different radical H, CH₃, C₂H₅, C₃H₇ signs. Surface-active agent can be used in the form of 5-20% water emulsion. In this case, surface-active agents can be injected together with hydrocarbon solvent in amount of 0.5-20% as to volume of hydrocarbon solvent. Application of aforesaid method allows for enhancing efficiency of cleaning wells from asphalt-resin-paraffin depositions. EFFECT: higher efficiency. 3 cl, 2 tbl