FIELD: mining, particularly, protective means of Christmas tree of packerless wells in sidetracking. SUBSTANCE: cap is installed on foundation and is shockproof. Cap includes body moved onto well. Cap body is hollow for putting on or for sliding onto Christmas tree. Weight is loaded on cap body and it far overweights the weight of falling derrick. EFFECT: reliable protection of Christmas tree from impact of falling derrick. 1 dwg
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