DEVICE FOR RESTORATION AND PRESERVATION OF COLLECTOR PROPERTIES OF FORMATION Russian patent published in 2007 - IPC E21B37/00 

FIELD: oil extractive industry, possible use as equipment for cleaning face zone of formation and well bottom from slurry, sand, paraffin, resins and other precipitations hard to extract by washing.

SUBSTANCE: device contains face cutoff plate including elastic collar and expanding cone, shaft with conic section in upper part provided with profiled groove and also a yoke mounted on shaft with guiding pin, free end of which is positioned in profiled groove, and spring-loaded oval sockets, expanding cone and shaft being connected by shear elements, and reverse valve, mounting tool. In accordance to invention reverse valve of face cutoff plate is mounted in valve box with longitudinal slits in upper part of expanding cone. Radial channels in the body of mounting tool are at same level with the saddle of reverse valve. Positioned in transverse wall of mounting tool is locking valve in form of cylindrical rod with supporting head in upper part, in starting position held by shear element and in working position interacting with valve box of reverse valve of face cutoff plate. In the body of mounting tool above transverse wall an additional transverse wall is positioned with check valve, above and below it grates are positioned. Body of mounting tool and expanding cone are connected by shear elements. Yoke of face cutoff plate shaft is provided with spring localizers. Oval sockets are held on levers connected to aforementioned yoke.

EFFECT: restoration and preservation of collector properties of formation, high serviceability, simple construction, low metal costs.

4 dwg