FIELD: oil and gas production, particularly to prevent damage of oil, gas and injection well casing pipes during well conservation and killing in permafrost rock zones.
SUBSTANCE: method involves arranging hydrosandblast perforator inside casing pipe at permafrost rock location site and cutting casing pipe walls; arranging isolation cement bridges in area of outer casing pipe surface contact with upper and lower permafrost rock zone boundaries; supplying pressurized highly-viscous liquid, for instance heavy oil, in perforated cavities (channels) beyond casing pipes; removing free water from thawed rock area surrounding well to decrease water content in rock and elimination of ice formation in the case of repeated rock freezing.
EFFECT: elimination of casing pipe crushing in permafrost rock zones, seal failure in temporarily abandoned or killed oil and gas well during secondary freezing of thawed rock.
1 dwg
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