FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry, particularly to rectification of corrugated cased strings of wells and restoration of their leak tightness. The method includes evaluation of all information along the defect interval, running and installation of additional volatile column, fixing it in the defect interval and successive cementing. Internal narrowing is rectified by means of beading or by mandrel. The additional column is equipped with thick wall cylinder holder with upper rest and exterior channels for cement flow; the holder is fixed when lowered with a prop from inside relative to the rectified section so, that the additional volatile column overlaps all interval of the defect section.
EFFECT: facilitates repair and increases operation life of well.
3 dwg
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