WELLHEAD CONNECTIONS OF HIGH-OUTPUT OIL WELL WITH ANNULAR GAS SHOW Russian patent published in 2015 - IPC E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: wellhead connections include a well with a multisection tubing head, casing head and three-way X-mass tree located at the wellhead. The casing head is equipped with two branches with two casing valves at each. Tool flange is placed between valves at the exhaust outlet. Barrel of X-mass tree is made of the central and master valve, the lower and upper three-way valves and swab valve. The operating line with X-mass wings and tool flange between them is connected to the upper three-way valve. The reserve operating line with two X-mass wings and tool flange between them is connected to the lower three-way valve. The operating line is connected to the exhaust outlet of the casing head thus forming the flow line. At end parts of the reserve operating line and choke branch of the casing head there are three-way valves and flare and choke lines are interconnected the valve branches through shutdown valves. Each section of the tubing head is equipped with a gate, to which an additional casing valve with safety valve and additional flare line and end valve is connected through a tube.

EFFECT: improved reliability and well control safety for operation of wells with annular gas show.

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