FIELD: oil and gas industry. SUBSTANCE: method refers to development of northern deposits because safety operation of them is possible only in summer period when there is no ice cover. Method implies periodic dismantling of upper part of drilling string over 100-150 m length from surface and hermetic sealing of remaining part of string. String is equipped with embracing float at preset depth above surface secured to sea bottom and holding string from side displacements. Sealing of string is effected at float level. EFFECT: high efficiency. 1 dwg
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