DRILLABLE PACKER Russian patent published in 2010 - IPC E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: drillable packer comprises setting tool, made of cylinder and piston with hollow stem, hollow cylindrical case with thread on external surface, body-mounted sealing element with upper and lower supports and conical supports, upper and lower bowl slip sockets, upper and lower pushers, upper of which is equipped with fixator. Circular sectors of upper and lower bowl slip sockets are rigidly joined to each other by breakable bridges. Lower pusher is rigidly connected to case and is equipped with spring fixator. Tail is rigidly connected to hollow stem and is equipped with radial channels below lower pusher and with plug at the bottom with circular recess so that it may interact with spring fixator. At the bottom, setting tool cylinder is equipped with chamber with separating partition, and hollow stem is equipped with movable bush outside with circular inner bore fixed by breakable element and installed within the chamber, and with radial holes for balls. Cavity of simple stem is tightly covered with plug having bore for fixation of balls, pressed outside of hollow stem by bush, circular bore of which is arranged with the possibility of match with balls after interaction of bush with separating partition of chamber.

EFFECT: simple and easy to produce structure, possibility to reliably separate zone of isolation under conditions of variation in wall thickness of strings, and also possibility to inject isolating materials into isolation zone in any combinations.

2 dwg