METHOD OF TREATMENT OF BOTTOM-HOLE FORMATION ZONE OF WELLS PRODUCING HEAVY OILS AND NATIVE BITUMENS Russian patent published in 2000 - IPC

FIELD: production of heavy oils and native bitumens used in operations concerned with increase of rock permeability. SUBSTANCE: method consists in injection into formation of aqueous alkali emulsion of pyrolysis light tar with additives of ferromagnetic components and still bottoms of production of synthetic fat acids. Ferromagnetic materials are used in the form of finely divided powder of chrome, vanadium, magnesium, aluminum, or hematite, ilmenite, hydromagnetite with particles sizing 5-15 nm with weight fraction of pyrolysis light tar of 15-25%. Ferromagnetic components-synthetic fat acid still bottoms weight ratio is (5-6):1. To prepare emulsion, use is made of aqueous solution of alkali components with weight fraction of 1-5%, and process of formation is accompanied by exposure to ultrasound with frequency of 100-1000 Hz at temperature of initial liquids of 70-80 C. Prior to formation of emulsion, aqueous solutions may be saturated with air in quantities of 1-50 cu. dm per cu.m of solution. Bottom-hole formation zone is treated with static magnetic field with field gradient of more than 3.10^-5 T/cm. EFFECT: higher permeability of rocks in production of heavy oils and native bitumens. 7 cl, 1 tbl