METHOD FOR EXTRACTING OIL DEPOSITS Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes displacement of oil from productive beds with use of alternating feeds of foam-forming solution - water solution of surfactant and gas, gas being fed in volume allowing conversion of foam-forming solution in the bed into foam contour with conditional order 4-5, then into formed foam contour water solution of surfactant is fed at volume allowing conversion of it into more moveable in bed gas-liquid contour having conditional order 1.1-1.2, then into formed gas-liquid contour gas is pumped until it transforms into foam contour again, while gas is fed up to moment of lowering of speed of increase of feeding pressure, and water solution of surfactant - until lowering of feeding pressure. Feeds of water solution of surfactant and gas is alternated until economically efficient extraction of oil deposits is reached.

EFFECT: higher watering of bed and intensified extraction of oil from low-penetrable oil-saturated areas with use of foam systems.

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