WELL BOTTOM ZONE TREATMENT METHOD Russian patent published in 2005 - IPC

FIELD: oil industry, particularly for stimulating production.

SUBSTANCE: method for treating bottom zone of well provided with tubing string involves performing lowering of flexible extremeline elongated pipes of coiled tubing plant; injecting light-gravity oil in well and to bottom zone; moving flexible extremeline elongated pipes of coiled tubing plant to well bottom; continuing oil injection up to full well-killing fluid substitution for oil; lifting lower ends of flexible extremeline elongated pipes up to reaching production bed roof; sealing well; injecting 0.5-1.5 m³ of hydrochloric acid solution into bottom zone through flexible extremeline elongated pipes of coiled tubing plant; lowering ends of flexible extremeline elongated pipes of coiled tubing plant for 0.8-1.2 m and injecting 0.5-1.5 m³ of hydrochloric acid solution; continuing lowering and injection operations up to reaching production bed bottom; lifting lower ends of flexible extremeline elongated pipes of coiled tubing plant for height equal to half of well height and leaving the extremeline elongated pipes as they are for 2-3 hours; gradually lowering flexible extremeline elongated pipes of coiled tubing plant up to reaching well bottom and injecting oil simultaneously with well fluid extraction through hole annuity; flushing well with oil; removing flexible extremeline elongated pipes of coiled tubing plant from the well and closing hole annuity; performing setup operations and bringing well into operation.

EFFECT: increased well debit.

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