METHOD TO PREVENT CASING PIPE CRUSHING INSIDE WELL DRILLED IN PERMAFROST ROCK

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 ca...

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Bibliographische Detailangaben
Hauptverfasser:	KONJUKHOV DMITRIJ ALEKSANDROVICH, KALASHNIKOV ANTON VLADIMIROVICH, KOROBOV STANISLAV VLADIMIROVICH, GUBAJDULLIN MARSEL' GALLIULOVICH
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	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