DEVICE FOR PIPE STRING PRESSURE-TESTING Russian patent published in 2007 - IPC E21B34/06 E21B17/00 

FIELD: oil production, particularly valve arrangements for boreholes or wells.

SUBSTANCE: device comprises cylindrical body 2 with sealing member 3 and seat 4. The seat 4 is made as upper restricted end 5 of central channel 6 made in pressure-testing coupling 7 installed in pipe string downstream of pipe string interval to be pressure-tested. Sealing member 3 is made as spherical lower body end having fishing head 8 with centrator 9 arranged from body end top. Spherical end of cylindrical body 2 may cooperate with seat in air-tight manner.

EFFECT: decreased device manufacturing costs and increased device production simplicity.

1 dwg