RELEASED BIDIRECTIONAL PACKER ON CABLE Russian patent published in 2009 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: released bidirectional packer on cable includes setting tool on cable, stationary bushing with main seat and movable central rod equipped with main stay nut and valve interacting with main seat, movable bushing, two opposing cones, screw-threaded dies connected to each other axially and designed to interact with corresponding cones, packer collar, and boss made to interact with extracting unit. The stationary bushing is equipped in its middle part with a lengthwise groove, while at the ends it is equipped with the main and additional seats and with upper and lower stops with bypass channels. Also the packer collar is made in form of an upper self-packing collar allowing bottom-up travel and located between the upper cone and upper stop. A lower self-packing collar is situated between the lower cone and lower stop; this lower self-packing collar travels downright; the movable bushing is located on the stationary bushing and is equipped with a pin inserted into the lengthwise groove of the stationary bushing. The screw-threaded dies are assembled on the movable bushing and are pressed inside with spring rings; the dies are equipped with centralisers, spring loaded outwards. Further the central rod is equipped with upper and lower circular grooves, with additional stay nut and valve; the main and additional valves are placed in corresponding upper and lower grooves and are able to pressure tight limited travel between the corresponding stops and internal edges of corresponding circular grooves; they are pressed from the stops to corresponding main and additional seats. The main and additional stay nuts are arranged at uniform distance from the pin of the movable bushing and interact with the pin. Also the lower stop is equipped with outward spring loaded plates assembled uniformly outside along the perimeter of the lower stop and designed to limited radial movement; the boss is rigidly connected with the top of the central rod. The boss is made in form of the tapered at the top cylinder, on the exterior surface of which there is made a shaped closed slot with a groove connecting the slot with the upper edge of the boss. The setting tool is made in form of a branch with a pin inserted into the shaped slot, which is made so, that at reciprocal movement of the setting tool relative to the boss at the length exceeding the height of the shaped slot the pin will be located within the limits of the shaped slot; if the length is less, then the pin will go into the groove of the shaped slot at travel upward.

EFFECT: simplification of packer design eliminating implementation of electric engine with cable and facilitating setting and disruption of packer in specified interval of well without special devices.

2 dwg