METHOD OF EMERGENCY KILLING OF FLOWING GAS WELL IN PRESENCE OF PERMAFROST ROCKS Russian patent published in 2016 - IPC E21B43/12 C09K8/42 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to an emergency killing of flowing gas wells in presence of permafrost rock (PFR). Method involves perforation interval locking by feeding on bottom hole and in well bore-hole formation zone via tubing string locking composition and further killing liquid injection into well, such as water-methanol solution. First, into well via tubing string is pumped liquid mixture of proppant, shut on water-methanol solution (WMS), taken in ratio of methanol:water equal to 40:60, in the following ratio of proppant and WMS 1:1 to form at bottom hole and bottom hole formation zone structure-forming array. As plugging composition is compound shut on said WMS, including, wt%: bentonite clay powder - 3-8, chalk - 0.5-1.5, PAC-VV - 0.2-0.5, soda - 0-0.5. Blocking composition is pressed to formation depth killing fluid with filling well bore.

EFFECT: technical result consists in reduction of duration and improvement of efficiency of killing flowing gas wells under conditions of PFR without thawing, eliminating abrupt reduction of killing liquid level in the well and emission of tubing string, reduction of probability of open gas blow-out and fire, and when it occurs in fast termination of gas inflow and elimination of flowing.

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