DEVICE FOR PIPE STRING INTERVAL PRESSURE-TESTING Russian patent published in 2006 - IPC E21B17/00 E21B33/12 

FIELD: mining, particularly devices for periodical production string interval pressure-testing inside well.

SUBSTANCE: device comprises pressure-testing valve to be lowered in pipe string. The valve has body, head for fishing tool receiving connected to valve body, anchoring unit with a number of driving retainers made as levers and sealing unit with compactor. Shoe made as tubular section is installed at lower end of pipe string to be pressure-tested. The tubular section defines length-limited inner annular space having diameter exceeding inner diameter of pipe string to be pressure-tested. Compactor is arranged between lower fixed and upper movable valve body parts. The lower and upper valve body parts are mutually spring-loaded and provided with outer facets. Anchoring unit includes upper and lower anchoring members serially arranged in lower fixed valve body part. Each anchoring member is provided with individual drive made as wedge with spring and is made as a pair of cooperating double-armed driving levers installed on common hinge and provided with lower anchoring ends. The lower anchoring ends correspondingly engage pipe string joint and the shoe.

EFFECT: simplified structure and increased operational reliability.

5 dwg