BRIDGE PLUG Russian patent published in 2006 - IPC E21B33/12 

FIELD: oil production industry, particularly for temporary bore sealing during isolation work performing.

SUBSTANCE: bridge plug comprises stem with cap, stops and annular recess formed on outer surface of upper part thereof. Installed in the annular recess is bush having outer annular extension and annular cut on outer surface. Plug comprises sealing member, cone, sealing member location fixer, slips, body and setting tool rod, as well as mounting fixer, vertical grooves, removable unit to support balls on the inside thereof. The removable unit is made as hollow cylinder and is telescopically installed in setting tool body. Annular stop is created in upper part of inner stem surface. The annular stop is provided with depressions for balls. Setting tool body is connected with rod by breakable members and provided with conical part arranged from outside thereof. The conical part tapers in downward direction and passes into cylindrical part provided with short and long grooves. Upper part of short groove is connected with central part of long groove by transversal groove. Depression with radial orifices for balls is created in lower part of setting tool body and is telescopically inserted in the stem. Annular depression is provided with limiter arranged from lower part thereof. The limiter may cooperate with annular stop of the stem. Bush is installed in annular stem depression so that in transport position bush is restricted from axial displacement. Annular extension of the bush is located in upper part thereof. Cone tapers in upward direction. Slips are composite and include hollow bases and mounting fixers secured to the bases and installed to perform axial and rotary movement to cylindrical body part. Slips also have upper and lower dies with centrators, which are spring-loaded in outward directions and face central parts of the bases. Mounting fixer is made as finger cooperating with grooves and installed in short groove in transport position. Upper and lower dies are provided with conical surfaces arranged in upper and lower parts thereof. The conical surfaces may cooperate with conical body part and cone correspondingly in working position.

EFFECT: extended operational capabilities.

2 dwg