WELLHEAD CONNECTIONS OF LOW-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 multisection string and tubing heads, choke and kill and exhaust outlets and three-way Xmas tree. Barrel of the three-way X-mass tree is made of the central and master valve, the lower and upper three-way valves and swab valve. Operating line is connected to the upper three-way valve, a reserve line is connected to the lower three-way valve. The operating line is connected to the exhaust outlet of the tubing head by the three-way valve thus forming the flow line. At end parts of the reserve operating line and choke and kill outlet of the tubing head there are three-way valves and flare line is connected to one outlet while choke line is connected to the other one. At butt ends of each choke line there are quick disconnect couplings and at butt ends of flare lines there are burners. The lower and upper tubing-casing annulus of the well is coupled through a safety valve to the three-way valve placed at the choke and kill outlet.

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

1 dwg, 3 ex