METHOD OF REPAIR OF CASED STRING IN WELL WITH DEFECT SECTION AND WITH INTERIOR NARROWING

• Main Authors: ZIJATDINOV RADIK ZJAUZJATOVICH, STRAKHOV DMITRIJ VITAL'EVICH, OSNOS VLADIMIR BORISOVICH, TABASHNIKOV ROMAN ALEKSEEVICH, STERLJADEV JURIJ RAFAILOVICH, MAKHMUTOV IL'GIZAR KHASIMOVICH
• Format: Patent
• Language: English; Russian
• Published: 27.03.2009
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

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