METHOD OF GAS AND GAS CONDENSATE WELLS CASING STRING LEAKAGE SEALING Russian patent published in 2010 - IPC E21B33/13 

FIELD: oil-and-gas industry.

SUBSTANCE: according to method execute well killing, lifting to the surface a tubing string together with well equipment, examination of the tubing string, installation of two parkers on the TS, installing between which cementing by-pass sleeve. After the mentioned above assembly descending, fix the top parker at the level over the casing string detected leakage interval and fix the bottom parker at the level under the casing string detected leakage interval, then via the cementing by-pass sleeve, pump blocking composition into the hole clearance between two parkers, the blocking composition later pressed in to cavity behind the casing string and into the reservoir with a displacement liquid. Keep the blocking composition under pressure during hardening period, the transfer the well into production regime.

EFFECT: casing string leakage areas sealing reliability and quality increase also decrease well operation start-up time consumption.

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