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

FIELD: oil extractive industry.

SUBSTANCE: device has hoisting device, power supplying device with rotation drive, and packer connected to the latter through engaging assembly. Packer has shaft with left-handed and right-handed threads, upper and lower threaded bushings with outer slanting surface. These are placed on the shaft and directed by slanting surfaces facing each other. Also a sleeve with inner hollow is provided, which is placed coaxially on a shaft between threaded bushings. Rotation drive is reversing, and provided with output shaft with inner slits on the side of end and with a flange. Packer additionally has mechanical engaging sleeve having upper and lower half-couplings placed between upper threaded bushing and drive flange. Also a separator is provided with spring-loaded holders. Packer shaft on the side of upper end has a polyhedron which is connected to drive shaft through slits and is provided with additional thread placed between polyhedron and thread for mounting upper threaded bushing. Direction of rotation of these threads is opposite. Upper threaded bushing on the side directed to the drive is made in form of lower half-coupling, which has inner cylindrical hollow with cams on inner surface of the latter. Upper half-coupling is fixedly connected to drive flange and has bushing portion with inner thread, through which it is moveably mounted on the shaft, outer ring-shaped stopping shoulder and cams on outer cylindrical surface of bushing portion on the side directed to lower half-coupling. Separator is made in form of ring with radial guides. It is placed between upper threaded bushing and sleeve. Holders are made in form of mushroom heads, which have stem with profiled end, treads on outer surface of mushroom head cap, and are placed in separator guides.

EFFECT: provides for capability for repeated use of system with repeated relocations with higher reliability of connection in well in operation.

4 cl, 2 dwg