SYSTEM FOR PRESSURE TESTING OPERATION COLUMNS Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: system has hoisting device, power feeding device with drive for rotation and packer connected to the latter through connecting assembly, wherein packer has shaft with left-handed and right-handed threads, upper and lower threaded bushings with outer slanting surfaces, placed on the shaft and with slanting surfaces directed to each other, elastic collar with inner hollow placed coaxially on the shaft between threaded bushings. System also has mechanical engaging bushing, rotation drive is made reversing, equipped with output shaft with inner slits on the side of its end and with a flange. Engaging bushing has upper and lower half-couplings placed between drive flange and upper threaded bushing of packer. The latter additionally has spring-loaded slips placed between lower half-coupling and upper threaded bushing, and a bypass valve mounted in its lower portion for connecting above-packer and below-packer spaces. Packer shaft is made solid or composite of upper axis and lower bushing portion, rigidly connected to each other. Axis on the side of upper end has a polyhedron, which is mated to slits of drive shaft, and provided with additional thread placed between polyhedron and thread for fixing upper threaded bushing. Direction of rotation of these threads is opposite, upper threaded bushing, on the side facing the drive, is made stepped and provided with outer thread on each step, upper half-coupling has bushing portion with inner thread on lower end mated to additional axis thread, flange on upper end, by means of which it is immovably fixed to the flange of drive, and ring stop fixed on the flange. Lower half-coupling has inner thread in lower portion, by means of which it is rigidly fixed to upper threaded bushing, and outer slanting longitudinal guiding sockets facing the latter, and is engaged with upper half-coupling by rod-groove connection, slips being made in form of wedges with profiled guiding shelves on one side, by means of which they are moveably mounted in sockets of lower half-coupling. On the other side they have convex surface with treads, spring for fixing slips is placed coaxially on upper threaded bushing and provided with adjustable stopping washer fixed moveably on the thread of intermediate step of the latter, lower end of bushing portion of shaft is provided with a stop on the outside for the lower threaded bushing, bypass valve is placed on construction elements of lower threaded bushing and lower end of bushing shaft portion.

EFFECT: higher reliability.

10 cl, 10 dwg