Russians study annulus cement in Arctic wells

Low water-cement ratios, heat-insulating additives, and expanded vermiculite work together to prevent formation of defective cement sheaths in Arctic wellbores.Permafrost thickness in Russia’s Arctic fields, including Yamal, Urengoi, Yamburg, Zapolyarnoye, and others, varies from 380 to 600 m with a maximum subzero temperature of -6º C. The iciest rocks (up to 200 m thick) are formed by sandy and sandy-argillaceous deposits. Below these are loose, quasi-frozen, and low-temperature rocks that are not cemented with ice.An analysis of problems that occur during drilling of exploratory wells shows that the formation of funnels around wellheads, drilling mud loss, longitudinal insta...

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