FIELD: oil and gas production, particularly devices for annulus gas supply into flow string.
SUBSTANCE: device comprises check valve and hydraulic channel. Device is installed in hole annuity over well fluid level in flow string clutch. Device has branched channel with central restriction. The channel is communicated with upper end of circular check valve. The circular check valve has locking member made as bush. Lower end of circular check valve is communicated with hole annuity. Flow string comprises sealing means having length selected so that inlet and outlet orifices of branched channel are not sealed.
EFFECT: increased efficiency and reliability, decreased annulus gas pressure in well operated with the use of suction rods regardless of thermal well operation conditions and annulus gas pressure, as well as simplified device structure.
1 dwg
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