METHOD FOR RESTORING PRODUCTIVENESS AND STARTING OPERATION OF STANDING OIL AND GAS WELLS Russian patent published in 2004 - IPC

FIELD: oil and gas extracting industry.

SUBSTANCE: method includes performing maintenance and isolation operations, reopening of productive layer in starting range with depth, surpassing limits of polluted well-adjacent area by radius. Then, sparing perforation of operation column is performed, for example, by drilling perforators or hydraulic sand-blast perforation, in range of watered portion of productive bed below water-oil and water-gas contact for 1-2 meters. Newly formed perforation apertures are used to pump water-repellent compound through them, which forms water-repellent screen forcing water into depths of bed along radius. Then, sparing perforation of operation column is performed below starting range and above water-oil and gas-oil contact for 1-2 meters. Into behind-column space through newly formed apertures, above water-oil and gas-oil contact water-repellent compound is force-pumped, for example, compound on basis if polyvinyl alcohol. For prevention of behind-column flows of water and gas, cement bridge is placed in the column, which bridge covers newly formed perforation apertures. Productive bed is reopened by means of sparing perforation of operation column in first range of perforation with depth of perforation apertures surpassing limits of polluted area by radius. Flow is produced, well treatment is performed, well operation is started.

EFFECT: reliable restoration of wells productiveness, prevented flow of bed water to pit-face as well as appearance of behind-column flows of water and gas along cemented ring with minimal monetary costs.

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