METHOD OF EXECUTION OF REPAIR-INSULATING OPERATIONS IN WELL Russian patent published in 2008 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil producing industry, particularly to methods of supplying backfill material into well for execution of repair-insulating operations; invention is designed for additional pressurisation of flow string. The method consists in assembly of a cement bridge, in theoretical assessment of volume and level of backfill material in the well, in lowering the flow string, in pumping backfill material into the well to a damaged interval. After completion of the cement bridge installation before pumping backfill material fluid is withdrawn from the well, the safe depth of flow string placement is calculated, then flow string is lifted and its low end is set for 30 or more meters above the calculated safe depth of flow string placement.

EFFECT: facilitating normal completion of repair-insulating operations owing to exclusion of dilution of backfill material and avoiding lower part of flow string clamping during supply of backfill material into the well.

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