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SU1687758A1
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A method of conjugating two wells
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Pipe-cutting device
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Ball valve
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Equipment for piping of casing strings
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Clamping device
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Spherical cock
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Under pressure pipe line connection device
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Device for sealing well mouth
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Well-head sealing unit
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Method of preventing open gushing of oil and gas wells
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Method of jointing two wells
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Ball valve
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Wellhead deflector board
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Ball cock
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Mouth sealing head
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Device for retaining pipes
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Device for running pipes into well under pressure
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Seal of rotary shaft
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Device for clamping pipes
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Arrangement for connecting x-tree drilling tool
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