METHOD FOR KILLING WELLS WITH ABNORMALLY LOW FORMATION PRESSURE AND COMPOSITION FOR ITS IMPLEMENTATION Russian patent published in 2025 - IPC E21B43/12 C09K8/42 

FIELD: obtaining oil and gas from wells.

SUBSTANCE: group of inventions relates to oil and gas industry, in particular to methods of well killing and conservation. Method of killing wells with abnormally low formation pressure, including preparation of foaming solution, which, when pumped into the well, is supplied together with gas – nitrogen from a nitrogen plant in a volume ratio under normal conditions of a foaming solution : nitrogen, equal to 1:1-10, respectively, to form a foaming composition, wherein the foaming solution and nitrogen are pumped through the first tee, and the obtained foam is fed through the second tee, where the cross-linking solution is simultaneously supplied in a weight ratio of the foaming solution : the cross-linking solution, equal to 4:1, respectively, simultaneously with the foaming composition preparation, a blocking composition containing a gelling solution and a cross-linking solution is prepared, which are fed into the well simultaneously through the tee in a weight ratio of gel-forming solution : cross-linking solution equal to 4:1, respectively, and then the blocking composition is pressed into the well through the tee with a foaming composition. Gel-forming solution contains the following, wt.%: biocide of aqueous gels "RGU BioVG" 0.0075; guar polymer – gelling agent of aqueous gels "RGU GVG" grade C 0.3-0.6; fresh or mineralized water – the rest. Foaming solution contains, wt.%: biocide of aqueous gels "RGU BioVG" 0.0075; guar polymer – gelling agent of aqueous gels "RGU GVG" grade C 0.3-0.6; xanthan polymer 0.1-0.25; mixture of anionic and nonionic surfactants – foaming agent "RGU NG MGS" 0.5-1.5; fresh or mineralized water – the rest. Cross-linking solution contains, wt. %: boric cross-linker "RGU SBVG grade 10" 1.0-2.0; fresh or mineralized water – the rest.

EFFECT: effective killing of wells with abnormally low formation pressure.

7 cl, 2 tbl, 8 ex