DEVICE FOR HYDRAULIC PIPE STRING TESTING Russian patent published in 2006 - IPC E21B34/06 

FIELD: mining industry, particularly devices to provide periodic air testing of pipe string inside well.

SUBSTANCE: device comprises pressurizing valve having body with longitudinal groove and provided with head for fishing tool receiving. The valve includes anchoring unit having rod, driving mechanism and lever-like fixer set, sealing assembly with sealing means installed on the body and adapted for sealing means receiving. The device also has sleeve for pressurizing valve installation arranged at lower end of pipe string section to be air-tested, shoe made as a tube with inner annular cavity having diameter greater than inner diameter of pipe string to be air-tested. The device comprises sealing unit including lower and upper movable pistons and sealing member arranged between the pistons. Upper movable piston is provided with relief valve from the first piston side and with driving mechanism with spring-loaded piston from the second side. The relief valve has head corresponding to fishing tool. Lower piston is connected with the body provided with fixer set for anchoring unit receiving arranged in the body groove. The anchoring unit is made as a pair of double-armed pinned levers having lower ends which may cooperate with the shoe and spring-loaded wedge. The levers also have upper ends cooperating with spring-loaded rod through flat kinematic pair made as chain link.

EFFECT: simplified structure and increased reliability.

5 dwg