WELL KILLING LIQUID Russian patent published in 2008 - IPC E21B43/12 

FIELD: oil production industry, particularly killing of gas and gas-condensate wells before overhaul of wells drilled to thick productive reservoir or drilled in several reservoirs simultaneously.

SUBSTANCE: simultaneously injecting killing liquid via flexible pipe inside well, wherein killing liquid has volume equal to production tubing volume, and blocking solution, wherein blocking solution has volume providing filling of total perforation interval; bleeding air into flare line via tubing space; forcing blocking solution in well bottom zone with killing liquid, wherein killing liquid volume is equal to hole annuity volume minus blocking solution volume; lowering flexible pipe filled with killing liquid displaced from hole annuity inside production string up to lower perforation interval orifice reaching; injecting killing liquid in flexible pipe and forcing blocking solution in reservoir by killing liquid along with flexible pipe lifting within perforation interval and along with maintaining of backpressure in hole annuity and annular space defined by flexible pipe and production string. Killing liquid volume is equal to sum of flexible pipe volume and blocking solution volume.

EFFECT: increased reliability of gas and gas-condensate packing well killing.