METHOD FOR LOW-IMPACT PACKING WELL KILLING IN ABNORMALLY LOW RESERVOIR PRESSURE Russian patent published in 2008 - IPC E21B43/12 

FIELD: oil and gas production, particularly killing of gas and gas-condensate packing well having packer, circulation valve and another downhole equipment included in production tubing before well overhaul, particularly for well exposing productive reservoir with low reservoir properties.

SUBSTANCE: method involves lowering flexible pipe in well to lower perforation orifices; injecting blocking solution via flexible pipe to well bottom within perforation interval; lifting flexible pipe over perforation interval and filling annular space between flexible pipe and production string with killing liquid via flexible pipe; simultaneously discharging gas from annular space into environment through flare line; removing flexible pipe from well; opening circulation valve, for instance with the use of cable equipment; filling hole annuity of well over packer via circulation valve along with bleeding gas from hole annuity over packer into environment through flare line; performing technological time-delay; discharging gas caps from well tube and annular spaces accumulated during time-delay operation; equalizing killing liquid in tube and annular spaces of the well by opening liquid circulation through opened circulation valve.

EFFECT: possibility to retain reservoir properties of low-permeable reservoir without gas and gas condensate-packing well killing reliability decrease in abnormally low reservoir pressure.